Electrocatalytic hydrogen peroxide (H2O2) production via the two-electron oxygen reduction reaction (2e− ORR) is promising, but non-metal catalysts with high selectivity are lacking. Herein, a high content of pyrrolic N doped carbon (HPNC) with small mesopores is constructed. Over 80% H2O2 selectivity at a wide potential of 0.2–0.6 V is achieved. The finite element simulation reveals that small pore-size mesopores are beneficial to O2 adsorption. And in-situ characterization proves that HPNC suppresses the breakage of O–O bond and enhances the stabilization of *OOH intermediates, thus improving the 2e− ORR performance. This work highlights the combination of non-metal active sites and geometry for 2e− ORR electrocatalysis.
{"title":"Accelerated O2 adsorption and stabilized *OOH for electrocatalytic H2O2 production","authors":"Danni Deng, Jinxian Wang, Meng Wang, Yuchao Wang, Jiabi Jiang, Yingbi Chen, Yu Bai, Qiumei Wu, Yongpeng Lei","doi":"10.1016/j.jmst.2024.12.017","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.017","url":null,"abstract":"Electrocatalytic hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) production via the two-electron oxygen reduction reaction (2e<sup>−</sup> ORR) is promising, but non-metal catalysts with high selectivity are lacking. Herein, a high content of pyrrolic N doped carbon (HPNC) with small mesopores is constructed. Over 80% H<sub>2</sub>O<sub>2</sub> selectivity at a wide potential of 0.2–0.6 V is achieved. The finite element simulation reveals that small pore-size mesopores are beneficial to O<sub>2</sub> adsorption. And in-situ characterization proves that HPNC suppresses the breakage of O–O bond and enhances the stabilization of *OOH intermediates, thus improving the 2e<sup>−</sup> ORR performance. This work highlights the combination of non-metal active sites and geometry for 2e<sup>−</sup> ORR electrocatalysis.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"12 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.jmst.2024.11.054
Yanhui Cao, Junhao Zeng, Xuerong Zheng, Yuan Liu, Junda Lu, Jinfeng Zhang, Yang Wang, Yida Deng, Wenbin Hu
Oxygen reduction reaction (ORR) in neutral electrolyte is urgently needed in various areas, such as metal-air batteries. However, the N-coordinated transition-metal single-atom electrocatalysts confront sluggish catalytic kinetics due to the inappropriate electronic structure and the as-resulted unreasonable adsorption strength towards oxygen-containing intermediates. In this work, we develop a strategy to tune the Fe d-orbital spin state by introducing inert Si atom into the first coordination sphere of Fe-N4 moieties. The experimental and theoretical results suggest that Si atom generates the coordination field distortion of Fe and induces the Fe d-orbital spin state transforming from low to medium spin state. The optimized spin-electron filled state (t2g4eg1) of Fe sites weakens the adsorption strength to intermediates and reduces the energy barrier of *OH desorption. Consequently, Fe-Si/NC catalyst exhibits superior ORR performance compared with that of Fe-NC and commercial Pt/C, showing a more positive half-wave potential of 0.751 V (vs. RHE) in 0.1 mol/L phosphate buffered saline. In addition, Fe-Si/NC-based neutral zinc-air batteries show a maximum power density of 108.9 mW cm−2 and long-term stability for more than 200 h. This work represents the possibility of constructing distorted coordination configurations of single-atom catalysts to modulate electronic structure and enhance ORR activity in neutral electrolyte.
中性电解质中的氧还原反应（ORR）是金属-空气电池等多个领域的迫切需要。然而，N 配位过渡金属单原子电催化剂由于不合适的电子结构和对含氧中间产物不合理的吸附强度，导致催化动力学缓慢。在这项工作中，我们开发了一种通过在 Fe-N4 分子的第一配位层中引入惰性硅原子来调整 Fe d-轨道自旋态的策略。实验和理论结果表明，Si 原子产生了 Fe 的配位场畸变，诱导 Fe d-轨道自旋态从低自旋态转变为中自旋态。Fe位点的优化自旋电子填充态（t2g4eg1）削弱了对中间产物的吸附强度，降低了*OH解吸的能垒。因此，与 Fe-NC 和商用 Pt/C 相比，Fe-Si/NC 催化剂表现出更优越的 ORR 性能，在 0.1 mol/L 磷酸盐缓冲盐水中显示出 0.751 V 的正半波电位（相对于 RHE）。此外，基于 Fe-Si/NC 的中性锌-空气电池显示出 108.9 mW cm-2 的最大功率密度和超过 200 小时的长期稳定性。这项研究表明，构建单原子催化剂的扭曲配位构型可以调节电子结构并提高中性电解质中的 ORR 活性。
{"title":"Regulating d-orbital spin state of Fe in single-atom electrocatalyst for boosting oxygen reduction activity in neutral electrolyte","authors":"Yanhui Cao, Junhao Zeng, Xuerong Zheng, Yuan Liu, Junda Lu, Jinfeng Zhang, Yang Wang, Yida Deng, Wenbin Hu","doi":"10.1016/j.jmst.2024.11.054","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.054","url":null,"abstract":"Oxygen reduction reaction (ORR) in neutral electrolyte is urgently needed in various areas, such as metal-air batteries. However, the N-coordinated transition-metal single-atom electrocatalysts confront sluggish catalytic kinetics due to the inappropriate electronic structure and the as-resulted unreasonable adsorption strength towards oxygen-containing intermediates. In this work, we develop a strategy to tune the Fe d-orbital spin state by introducing inert Si atom into the first coordination sphere of Fe-N<sub>4</sub> moieties. The experimental and theoretical results suggest that Si atom generates the coordination field distortion of Fe and induces the Fe d-orbital spin state transforming from low to medium spin state. The optimized spin-electron filled state (t<sub>2g</sub><sup>4</sup>e<sub>g</sub><sup>1</sup>) of Fe sites weakens the adsorption strength to intermediates and reduces the energy barrier of *OH desorption. Consequently, Fe-Si/NC catalyst exhibits superior ORR performance compared with that of Fe-NC and commercial Pt/C, showing a more positive half-wave potential of 0.751 V (vs. RHE) in 0.1 mol/L phosphate buffered saline. In addition, Fe-Si/NC-based neutral zinc-air batteries show a maximum power density of 108.9 mW cm<sup>−2</sup> and long-term stability for more than 200 h. This work represents the possibility of constructing distorted coordination configurations of single-atom catalysts to modulate electronic structure and enhance ORR activity in neutral electrolyte.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"117 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cu-Cr alloys are widely applied in electronic, aerospace and nuclear industries, due to their high strength and high conductivity. However, their terrible softening resistance limits wider applications. This paper presents a novel strategy of integrating mechanism features into interpretable machine learning (ML) to develop softening-resistant Cu-Cr alloys and to understand their mechanisms. First, the mechanism features were specially designed to describe mechanisms potentially vital to softening resistance, and they were obtained through first-principles calculations. Those mechanism features that described interfacial segregation and solute diffusion exhibited significant Gini importance during feature selection. Only integrated with them, did ML models achieve great performance, accurate predictions, and successful development of Cu-0.4Cr-0.10La/Ce (wt.%) alloys with excellent softening resistance. Then, the contributions of these mechanism features to the predictions were interpreted by a game theoretic approach, but unexpectedly, they were not fully consistent with interpretations that we expected from mechanism features. Finally, investigation targeted at these inconsistencies gave novel insights into softening resistance mechanisms. The Cu-Cr-La/Ce alloys’ excellent softening resistance was not induced by a prevailing mechanism of La/Ce atoms segregating at phase interfaces, nor by an expected mechanism of La/Ce atoms improving the Cr atom jump energy barriers. Instead, it was caused by a unique mechanism in which La/Ce atoms competed with Cr atoms for vacancies and therefore depleted the available vacancies for the Cr atom jump. This paper demonstrates a new paradigm of developing softening-resistant Cu-Cr alloys and understanding their mechanisms via mechanism-informed interpretable ML.
{"title":"Developing softening-resistant Cu-Cr alloys and understanding their mechanisms via mechanism-informed interpretable machine learning","authors":"Muzhi Ma, Zhou Li, Yuyuan Zhao, Shen Gong, Qian Lei, Yanlin Jia, Wenting Qiu, Zhu Xiao, Yanbin Jiang, Xiandong Xu, Biaobiao Yang, Chenying Shi","doi":"10.1016/j.jmst.2024.10.053","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.053","url":null,"abstract":"Cu-Cr alloys are widely applied in electronic, aerospace and nuclear industries, due to their high strength and high conductivity. However, their terrible softening resistance limits wider applications. This paper presents a novel strategy of integrating mechanism features into interpretable machine learning (ML) to develop softening-resistant Cu-Cr alloys and to understand their mechanisms. First, the mechanism features were specially designed to describe mechanisms potentially vital to softening resistance, and they were obtained through first-principles calculations. Those mechanism features that described interfacial segregation and solute diffusion exhibited significant Gini importance during feature selection. Only integrated with them, did ML models achieve great performance, accurate predictions, and successful development of Cu-0.4Cr-0.10La/Ce (wt.%) alloys with excellent softening resistance. Then, the contributions of these mechanism features to the predictions were interpreted by a game theoretic approach, but unexpectedly, they were not fully consistent with interpretations that we expected from mechanism features. Finally, investigation targeted at these inconsistencies gave novel insights into softening resistance mechanisms. The Cu-Cr-La/Ce alloys’ excellent softening resistance was not induced by a prevailing mechanism of La/Ce atoms segregating at phase interfaces, nor by an expected mechanism of La/Ce atoms improving the Cr atom jump energy barriers. Instead, it was caused by a unique mechanism in which La/Ce atoms competed with Cr atoms for vacancies and therefore depleted the available vacancies for the Cr atom jump. This paper demonstrates a new paradigm of developing softening-resistant Cu-Cr alloys and understanding their mechanisms via mechanism-informed interpretable ML.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"5 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Metal coating is a prevalent strategy for enhancing surface properties. Among the numerous methods for preparing coatings, electrodeposition stands out due to its simplicity, cost-effectiveness, and high efficiency, making it widely utilized in various metal coating applications. By meticulously selecting appropriate electrolytes and electrodeposition parameters, metal coatings with diverse structures and morphologies can be obtained, and tailored to meet specific performance requirements. As the demand for superior metal coating performance continues to rise, it is imperative to summarize and forecast electrodeposition techniques to meet the criteria for high quality and precision. This review delves into the electrodeposition preparation of several typical metal coatings in diverse electrolyte systems, including aqueous solutions, ionic liquids, deep eutectic solvents, and molten salts. We also examine the electrodeposition process on the cathode, elucidate the correlation between parameters and coating quality, and suggest future research directions. This review aims to provide valuable insights and guidance for the electrodeposition preparation of metal coatings.
{"title":"Exploring coating electrodeposition protocols from a cross-electrolyte and cross-metal perspective","authors":"Qi Wang, Rui Yuan, Mengbin Yang, Wei Gao, Shuqiang Jiao, Donghua Tian, Handong Jiao, Hongying Yu, Dongbai Sun","doi":"10.1016/j.jmst.2024.12.015","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.015","url":null,"abstract":"Metal coating is a prevalent strategy for enhancing surface properties. Among the numerous methods for preparing coatings, electrodeposition stands out due to its simplicity, cost-effectiveness, and high efficiency, making it widely utilized in various metal coating applications. By meticulously selecting appropriate electrolytes and electrodeposition parameters, metal coatings with diverse structures and morphologies can be obtained, and tailored to meet specific performance requirements. As the demand for superior metal coating performance continues to rise, it is imperative to summarize and forecast electrodeposition techniques to meet the criteria for high quality and precision. This review delves into the electrodeposition preparation of several typical metal coatings in diverse electrolyte systems, including aqueous solutions, ionic liquids, deep eutectic solvents, and molten salts. We also examine the electrodeposition process on the cathode, elucidate the correlation between parameters and coating quality, and suggest future research directions. This review aims to provide valuable insights and guidance for the electrodeposition preparation of metal coatings.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"371 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142917883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02DOI: 10.1016/j.jmst.2024.12.014
Shuze Wang, Caihao Huang, Xiyue Zhang, Lei Cao, Yuzhong Gao, Qiang Wang, Qing Zhou, Rui Yang, Xing Zhang, Zhenning Li
Guided bone regeneration in the alveolar bone relies on the colonization and differentiation of immune cells within the defect area. The absence of osteoinductive and osteoimmune properties of currently available scaffolds hinders to achieve optimal repair outcomes in clinical settings. Thus, we aimed to enhance the bone repair ability of polycaprolactone (PCL) scaffolds by incorporating osteoinductive amorphous calcium phosphate (ACP) with immune-regulating zinc ions (ACP(Zn), ACZP), to create a favorable immunomodulatory microenvironment. After one day of co-culture with PCL-ACZP, the spreading area of macrophage cells can reach 47.6%, 2.7 times of that from the original PCL scaffold. Additionally, over 32.1% of macrophages exhibited M2 polarization was observed within three days of co-culture. The PCL-ACZP/macrophage-conditioned medium significantly boosted osteogenic gene expression in MC3T3-E1 cells. After eight weeks of implantation in a rat femoral condyle defect, the BV/TV from the PCL-ACZP group reached 32.9%, 1.4 times of that from the PCL group. Furthermore, the PCL-ACZP-GelMA biphasic module as prepared successfully achieved complete regeneration of three-walled alveolar bone defects in rabbits, resulting in arch-shaped alveolar bone repair and providing greater convenience in the clinical settings. This study showcased the effectiveness of PCL-ACZP-GelMA biphasic module as bioactive scaffolds in the morphological restoration of alveolar bone.
{"title":"Zinc doped amorphous calcium phosphate integrated GBR module role in facilitating bone augmentation via immunostimulation of osteogenesis","authors":"Shuze Wang, Caihao Huang, Xiyue Zhang, Lei Cao, Yuzhong Gao, Qiang Wang, Qing Zhou, Rui Yang, Xing Zhang, Zhenning Li","doi":"10.1016/j.jmst.2024.12.014","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.014","url":null,"abstract":"Guided bone regeneration in the alveolar bone relies on the colonization and differentiation of immune cells within the defect area. The absence of osteoinductive and osteoimmune properties of currently available scaffolds hinders to achieve optimal repair outcomes in clinical settings. Thus, we aimed to enhance the bone repair ability of polycaprolactone (PCL) scaffolds by incorporating osteoinductive amorphous calcium phosphate (ACP) with immune-regulating zinc ions (ACP(Zn), ACZP), to create a favorable immunomodulatory microenvironment. After one day of co-culture with PCL-ACZP, the spreading area of macrophage cells can reach 47.6%, 2.7 times of that from the original PCL scaffold. Additionally, over 32.1% of macrophages exhibited M2 polarization was observed within three days of co-culture. The PCL-ACZP/macrophage-conditioned medium significantly boosted osteogenic gene expression in MC3T3-E1 cells. After eight weeks of implantation in a rat femoral condyle defect, the BV/TV from the PCL-ACZP group reached 32.9%, 1.4 times of that from the PCL group. Furthermore, the PCL-ACZP-GelMA biphasic module as prepared successfully achieved complete regeneration of three-walled alveolar bone defects in rabbits, resulting in arch-shaped alveolar bone repair and providing greater convenience in the clinical settings. This study showcased the effectiveness of PCL-ACZP-GelMA biphasic module as bioactive scaffolds in the morphological restoration of alveolar bone.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"5 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-02DOI: 10.1016/j.jmst.2024.11.053
Huiling Su, Zhikun Wang, Jianqiang Zhang, Nannan Cui, Fengting Li, Miantuo Li, Wentao Qu, Xupeng Li, Jiaqi Feng, Songqing Hu
Responsive nanocontainers have dual functions in targeted delivery of corrosion inhibitors and emulsion development of shale oil in oil and gas fields, exhibiting potential for simultaneously achieving metal protection and efficient oil and gas development from a material perspective. Here, we propose the preparation of a pH-responsive nanocontainer, HMSNs-g-PDEAEMA (poly [2-(N, N-diethyl amino)-ethyl-methacrylate] (PDEAEMA) grafted onto hollow mesoporous spherical silica (HMSNs)), to integrate the delivery of 2-mercaptobenzothiazole (MBT)) for targeted corrosion inhibition and the emulsification of oil as Pickering emulsifiers. Under acidic conditions (reduced pH value caused by localized corrosion or high concentration acidic gases), PDEAEMA chains are protonated and extended by electrostatic repulsion, exposing pores on HMSNs surface and allowing the controlled release of loaded MBT molecules. Once transforming into a neutral or alkaline environment, the responsive release of the MBT process is inhibited. After the fluid passes through the wellbore and enters the shale layer, the HMSNs-g-PDEAEMA nanocontainers act as Pickering emulsifiers to achieve emulsification. The emulsified oil can be extracted onto the ground more efficiently, and a following pH-responsive demulsification process can be achieved. Overall, through a pH-responsive nanocontainer material, the dual function of corrosion inhibition and emulsification in oil and gas development is possible to be simultaneously achieved.
{"title":"Tunable pH-responsive HMSNs-g-PDEAEMA as integrated corrosion inhibition and emulsification multi-functional nanocontainer","authors":"Huiling Su, Zhikun Wang, Jianqiang Zhang, Nannan Cui, Fengting Li, Miantuo Li, Wentao Qu, Xupeng Li, Jiaqi Feng, Songqing Hu","doi":"10.1016/j.jmst.2024.11.053","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.053","url":null,"abstract":"Responsive nanocontainers have dual functions in targeted delivery of corrosion inhibitors and emulsion development of shale oil in oil and gas fields, exhibiting potential for simultaneously achieving metal protection and efficient oil and gas development from a material perspective. Here, we propose the preparation of a pH-responsive nanocontainer, HMSNs-<em>g</em>-PDEAEMA (poly [2-(N, N-diethyl amino)-ethyl-methacrylate] (PDEAEMA) grafted onto hollow mesoporous spherical silica (HMSNs)), to integrate the delivery of 2-mercaptobenzothiazole (MBT)) for targeted corrosion inhibition and the emulsification of oil as Pickering emulsifiers. Under acidic conditions (reduced pH value caused by localized corrosion or high concentration acidic gases), PDEAEMA chains are protonated and extended by electrostatic repulsion, exposing pores on HMSNs surface and allowing the controlled release of loaded MBT molecules. Once transforming into a neutral or alkaline environment, the responsive release of the MBT process is inhibited. After the fluid passes through the wellbore and enters the shale layer, the HMSNs-<em>g</em>-PDEAEMA nanocontainers act as Pickering emulsifiers to achieve emulsification. The emulsified oil can be extracted onto the ground more efficiently, and a following pH-responsive demulsification process can be achieved. Overall, through a pH-responsive nanocontainer material, the dual function of corrosion inhibition and emulsification in oil and gas development is possible to be simultaneously achieved.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"45 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Three-dimensional (3D) carbon aerogel with high porosity and lightweight merit has emerged as an important high-performance electromagnetic (EM) absorption material. Despite great progress has been made, most reported 3D carbon aerogels suffer from non-renewability and high cost. Moreover, the randomly distributed porous structure restricts the effective regulation of microwave absorption. Herein, the sustainable shaddock peel cellulose (SPC) was adopted to construct an ultralight and orientated carbon aerogel through a facile bidirectional freezing technique and subsequently thermal treatment process. The resultant carbon aerogel is composed of ordered lamellar layers interconnected by supported bridges, forming a continuous 3D conductive network. Addition of a small amount of graphene oxides (GO) nanosheets in biomass aerogel enhances the interaction of SPC and promotes electron transmission along 3D conductive network. Through tuning the lamellar spacing of aerogel, the as-prepared carbon aerogel achieves a remarkable microwave absorption property with a strong reflection loss (RL) of -63.0 dB and broad effective absorption bandwidth (EAB) of 7.0 GHz under ultralow filler content of 4 wt.%. Moreover, this carbon aerogel also demonstrates excellent thermal insulation property, and is even comparable to commercial products. The present work paves the way for designing low-cost and sustainable biomass-derived carbon aerogel for lightweight and high-performance microwave absorption and infrared stealth function.
{"title":"Biomass-derived oriented carbon aerogels with integrated high-performance microwave absorption and thermal insulation","authors":"Huanqin Zhao, Xin Yang, Jiachen Sun, Hualiang Lv, Xiaohuan Liu, Xuke He, Changqin Jin, Renchao Che","doi":"10.1016/j.jmst.2024.11.051","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.051","url":null,"abstract":"Three-dimensional (3D) carbon aerogel with high porosity and lightweight merit has emerged as an important high-performance electromagnetic (EM) absorption material. Despite great progress has been made, most reported 3D carbon aerogels suffer from non-renewability and high cost. Moreover, the randomly distributed porous structure restricts the effective regulation of microwave absorption. Herein, the sustainable shaddock peel cellulose (SPC) was adopted to construct an ultralight and orientated carbon aerogel through a facile bidirectional freezing technique and subsequently thermal treatment process. The resultant carbon aerogel is composed of ordered lamellar layers interconnected by supported bridges, forming a continuous 3D conductive network. Addition of a small amount of graphene oxides (GO) nanosheets in biomass aerogel enhances the interaction of SPC and promotes electron transmission along 3D conductive network. Through tuning the lamellar spacing of aerogel, the as-prepared carbon aerogel achieves a remarkable microwave absorption property with a strong reflection loss (RL) of -63.0 dB and broad effective absorption bandwidth (EAB) of 7.0 GHz under ultralow filler content of 4 wt.%. Moreover, this carbon aerogel also demonstrates excellent thermal insulation property, and is even comparable to commercial products. The present work paves the way for designing low-cost and sustainable biomass-derived carbon aerogel for lightweight and high-performance microwave absorption and infrared stealth function.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"66 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142908414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-31DOI: 10.1016/j.jmst.2024.11.050
Tong Wu, Ce Wang, Yuyuan Liu, Qiuguang Zhang, Panpan Lin, Xin Yue, Tiesong Lin, Peng He
The challenge of low temperature and rapid diffusion bonding of a Ni-based superalloy was hereby addressed by using a Ni nano-coating and a spark plasma sintering (SPS). It successfully produced a Ni-based superalloy joint with 337 MPa shear strength at 500°C for 30 min, which is approximately 400°C lower than the traditional hot pressure diffusion bonding (HPDB) temperature. The microstructure and mechanical properties of the joints were systematically investigated. It is revealed that the pulsed current and ultra-fine grains (19 nm) in the Ni nano-coating could significantly facilitate voids closure. The voids closure mechanisms involved (i) pulsed current strengthened plastic deformation, (ii) pulsed current strengthened surface source diffusion, (iii) pulsed current strengthened bonding interface diffusion, (iv) grain growth dividing the initial large voids into nano-voids, and (v) massive grain boundaries (GBs), lattice defects, and local high-temperature strengthened GBs diffusion. Furthermore, the GBs migration across the interface was investigated, and the results revealed that the GBs migration and fine grains (350 nm) near the bonding interface together increased the joint strength.
{"title":"A new strategy for preparing high strength diffusion-bonded Ni-based superalloy joints at ultra-low temperature via surface nanocrystallization and spark plasma sintering","authors":"Tong Wu, Ce Wang, Yuyuan Liu, Qiuguang Zhang, Panpan Lin, Xin Yue, Tiesong Lin, Peng He","doi":"10.1016/j.jmst.2024.11.050","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.050","url":null,"abstract":"The challenge of low temperature and rapid diffusion bonding of a Ni-based superalloy was hereby addressed by using a Ni nano-coating and a spark plasma sintering (SPS). It successfully produced a Ni-based superalloy joint with 337 MPa shear strength at 500°C for 30 min, which is approximately 400°C lower than the traditional hot pressure diffusion bonding (HPDB) temperature. The microstructure and mechanical properties of the joints were systematically investigated. It is revealed that the pulsed current and ultra-fine grains (19 nm) in the Ni nano-coating could significantly facilitate voids closure. The voids closure mechanisms involved (i) pulsed current strengthened plastic deformation, (ii) pulsed current strengthened surface source diffusion, (iii) pulsed current strengthened bonding interface diffusion, (iv) grain growth dividing the initial large voids into nano-voids, and (v) massive grain boundaries (GBs), lattice defects, and local high-temperature strengthened GBs diffusion. Furthermore, the GBs migration across the interface was investigated, and the results revealed that the GBs migration and fine grains (350 nm) near the bonding interface together increased the joint strength.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"33 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142908415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Partial phase transformation in NiTi-based refrigerants usually enables efficient and durable elastocaloric cooling, but its thermomechanical behavior with varying temperatures remains unclear. Keeping this in view, the elastocaloric effect of NiTi under incomplete transformation across 15–100°C is investigated and a superelastic deformation window between 25–85°C is identified. Synchronous infrared thermography and digital image correlation, and an innovative macro-micro phase-field model are employed to examine martensitic transformation and elastocaloric properties of NiTi within the superelastic window. Experimental and simulated results consistently reveal that the spatiotemporal thermal profiles correlate with Lüders strain band evolution. As superelastic deformation temperature increases, strain localization intensifies, with Lüders bands favoring an inward strain growth over an outward expansion, resulting in a smaller yet more deformed martensitic transformation zone. The aggravated strain inhomogeneity makes the local endothermic undercooling tested at 85°C up to about twice (−30.05°C) that at 25°C (−15.32°C), boosting the global cooling capacity by 65%, despite constant strain. The seeming contradiction between the larger elastocaloric effect and the narrower apparent martensitic transformation zone is elucidated by recourse to the simulations. It is found that the martensitic transformation within the Lüders bands is incomplete, proceeding in a macroscopically uniform but microscopically heterogeneous manner. Elevated temperatures within the superelastic window increase the transformed volume fraction and enhance martensitic transformation, thereby strengthening the global caloric effect. The work sheds light on the interplay between partial martensitic transformation and thermal behavior in NiTi under varying superelastic deformation temperatures, providing insights for advanced elastocaloric cooling applications.
{"title":"Temperature dependence of incomplete martensitic transformation and elastocaloric properties of superelastic NiTi: Experiment and phase-field simulation","authors":"Junyu Chen, Qi Zhang, Boxin Wei, Wenqiang Wang, Wenjing Zhang, Liping Lei, Upadrasta Ramamurty, Gang Fang","doi":"10.1016/j.jmst.2024.11.052","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.052","url":null,"abstract":"Partial phase transformation in NiTi-based refrigerants usually enables efficient and durable elastocaloric cooling, but its thermomechanical behavior with varying temperatures remains unclear. Keeping this in view, the elastocaloric effect of NiTi under incomplete transformation across 15–100°C is investigated and a superelastic deformation window between 25–85°C is identified. Synchronous infrared thermography and digital image correlation, and an innovative macro-micro phase-field model are employed to examine martensitic transformation and elastocaloric properties of NiTi within the superelastic window. Experimental and simulated results consistently reveal that the spatiotemporal thermal profiles correlate with Lüders strain band evolution. As superelastic deformation temperature increases, strain localization intensifies, with Lüders bands favoring an inward strain growth over an outward expansion, resulting in a smaller yet more deformed martensitic transformation zone. The aggravated strain inhomogeneity makes the local endothermic undercooling tested at 85°C up to about twice (−30.05°C) that at 25°C (−15.32°C), boosting the global cooling capacity by 65%, despite constant strain. The seeming contradiction between the larger elastocaloric effect and the narrower apparent martensitic transformation zone is elucidated by recourse to the simulations. It is found that the martensitic transformation within the Lüders bands is incomplete, proceeding in a macroscopically uniform but microscopically heterogeneous manner. Elevated temperatures within the superelastic window increase the transformed volume fraction and enhance martensitic transformation, thereby strengthening the global caloric effect. The work sheds light on the interplay between partial martensitic transformation and thermal behavior in NiTi under varying superelastic deformation temperatures, providing insights for advanced elastocaloric cooling applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"1 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antiphase boundaries (APBs) are intrinsic defects in Fe3O4 films that significantly alter their magnetic and transport properties compared to the bulk material due to antiferromagnetic interactions across these boundaries. In the study, we realize ferromagnetically coupled APBs in spinel ferrite by cation disorder and oxygen vacancy defects. Ni and Zn are introduced into Fe3O4 to form Ni and NiZn ferrites and cation disorder is found in the two ferrites with Ni and Zn occupied in both octahedral and tetrahedral sites. This disorder transforms the ferrites from semiconductors into half-metals, characterized by a nonzero majority spin density of states (DOS) and a zero minority spin DOS at Fermi level. The stacking fault of the cations (Fe, Ni, Zn) at the APB induces excess negative charges, leading to the formation of oxygen vacancies as charge compensators. These vacancies disrupt the antiferromagnetic superexchange interactions, preventing spin polarization reversal across the APB, thereby enabling ferromagnetic coupling. This work provides insights into tuning the magnetic properties of APBs in spinel ferrites through defect engineering and cation manipulation.
{"title":"Oxygen vacancies at antiphase boundaries in cation-disordered spinel ferrite","authors":"Zhenhua Zhang, Jinhu Wang, Chenglong Hu, Sateesh Bandaru, Xuefeng Zhang","doi":"10.1016/j.jmst.2024.11.048","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.048","url":null,"abstract":"Antiphase boundaries (APBs) are intrinsic defects in Fe<sub>3</sub>O<sub>4</sub> films that significantly alter their magnetic and transport properties compared to the bulk material due to antiferromagnetic interactions across these boundaries. In the study, we realize ferromagnetically coupled APBs in spinel ferrite by cation disorder and oxygen vacancy defects. Ni and Zn are introduced into Fe<sub>3</sub>O<sub>4</sub> to form Ni and NiZn ferrites and cation disorder is found in the two ferrites with Ni and Zn occupied in both octahedral and tetrahedral sites. This disorder transforms the ferrites from semiconductors into half-metals, characterized by a nonzero majority spin density of states (DOS) and a zero minority spin DOS at Fermi level. The stacking fault of the cations (Fe, Ni, Zn) at the APB induces excess negative charges, leading to the formation of oxygen vacancies as charge compensators. These vacancies disrupt the antiferromagnetic superexchange interactions, preventing spin polarization reversal across the APB, thereby enabling ferromagnetic coupling. This work provides insights into tuning the magnetic properties of APBs in spinel ferrites through defect engineering and cation manipulation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"334 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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