{"title":"Weak Li-O bonds and small grains enable fast ion diffusion and electron transport for LiFePO4 cathode","authors":"Han-xin Wei, Dao-fa Ying, Jing-ju Liu, Yang Lv, Yu-tao Liu, Jiang-feng Wang, Xuan-lin Gong, Mu-yang Zhou, Zuo-sheng Li, Kuo Chen, Luo-jia Chen, Chuan-ping Wu, Bao-hui Chen","doi":"10.1016/j.mtadv.2024.100502","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100502","url":null,"abstract":"","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-20DOI: 10.1016/j.mtadv.2024.100498
Thalita Maysha Herninda, Zi-Ying Chen, Ching-Hwa Ho
Band gap engineering is crucial in the development of two-dimensional layered materials in nanoelectronics, optoelectronics, and photonics fields. In this study, we present characteristics of layered SnSSe (0 ≤ x ≤ 1) ternary alloys grown via chemical vapor transport (CVT) with tunable compositions. Polarized micro-Raman spectroscopy shows the existence of intralayer E and A modes in all the compositions. The A mode demonstrates a pronounced resonant intensity, whilst the E mode is significantly weaker. In the ternary compositions, two groups of E and A modes undergo shift, reflecting lattice and bond transitions from S-rich to Se-rich compositions. Micro-thermoreflectance and optical transmission spectroscopy reveal tunable optical properties consistent with the alloy-composition change. All samples exhibit a single band-edge transition peak, shifting from 1.3 eV (for pure SnSe) to 2.3 eV (for pure SnS), indicating high-quality alloy nanosheets of SnSSe. The optical and electrical applications, such as photodegradation, photoconductivity, and thermoelectric performance are also explored. The alteration in selenium composition within SnSSe is observed to significantly influence potential applications of the materials. The materials with a predominant selenium composition exhibit superior electrical and thermoelectric properties, whereas those with a sulfur-dominant composition manifest enhanced optical characteristics. The engineered 2D structures presents promising opportunities for investigating their fundamental physical properties and also exploring their wide-range applications in electronic and optoelectronic devices, as well as in the field of energy and photocatalytic application.
带隙工程对于二维层状材料在纳米电子学、光电子学和光子学领域的发展至关重要。在本研究中，我们介绍了通过化学气相传输（CVT）生长的具有可调成分的层状 SnSSe（0 ≤ x ≤ 1）三元合金的特性。偏振微拉曼光谱显示，在所有成分中都存在层内 E 和 A 模式。A 模式具有明显的共振频率，而 E 模式则明显较弱。在三元成分中，两组 E 和 A 模式发生了转变，反映了从富 S 成分到富 Se 成分的晶格和键的转变。显微热反射光谱和透射光谱显示了与合金成分变化相一致的可调光学特性。所有样品都显示出单个带边转变峰，从 1.3 eV（纯 SnSe）转变到 2.3 eV（纯 SnS），表明了高质量的 SnSSe 合金纳米片。此外，还探讨了光降解、光导和热电性能等光学和电学应用。据观察，SnSSe 中硒成分的变化会对材料的潜在应用产生重大影响。硒成分占主导地位的材料具有优异的电学和热电性能，而硫成分占主导地位的材料则具有更强的光学特性。这种工程二维结构为研究其基本物理性质以及探索其在电子和光电设备、能源和光催化应用领域的广泛应用提供了大好机会。
{"title":"Structural, optical and electrical properties in multilayer SnS2(1-x)Se2(x) compounds for energy, thermoelectric and photocatalytic application","authors":"Thalita Maysha Herninda, Zi-Ying Chen, Ching-Hwa Ho","doi":"10.1016/j.mtadv.2024.100498","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100498","url":null,"abstract":"Band gap engineering is crucial in the development of two-dimensional layered materials in nanoelectronics, optoelectronics, and photonics fields. In this study, we present characteristics of layered SnSSe (0 ≤ x ≤ 1) ternary alloys grown via chemical vapor transport (CVT) with tunable compositions. Polarized micro-Raman spectroscopy shows the existence of intralayer E and A modes in all the compositions. The A mode demonstrates a pronounced resonant intensity, whilst the E mode is significantly weaker. In the ternary compositions, two groups of E and A modes undergo shift, reflecting lattice and bond transitions from S-rich to Se-rich compositions. Micro-thermoreflectance and optical transmission spectroscopy reveal tunable optical properties consistent with the alloy-composition change. All samples exhibit a single band-edge transition peak, shifting from 1.3 eV (for pure SnSe) to 2.3 eV (for pure SnS), indicating high-quality alloy nanosheets of SnSSe. The optical and electrical applications, such as photodegradation, photoconductivity, and thermoelectric performance are also explored. The alteration in selenium composition within SnSSe is observed to significantly influence potential applications of the materials. The materials with a predominant selenium composition exhibit superior electrical and thermoelectric properties, whereas those with a sulfur-dominant composition manifest enhanced optical characteristics. The engineered 2D structures presents promising opportunities for investigating their fundamental physical properties and also exploring their wide-range applications in electronic and optoelectronic devices, as well as in the field of energy and photocatalytic application.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-15DOI: 10.1016/j.mtadv.2024.100497
Muhammad Raies Abdullah, Zhen Peng
{"title":"“ Review and perspective on additive manufacturing of refractory high entropy alloys”","authors":"Muhammad Raies Abdullah, Zhen Peng","doi":"10.1016/j.mtadv.2024.100497","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100497","url":null,"abstract":"","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-14DOI: 10.1016/j.mtadv.2024.100493
Geoffrey Rivers, Anna Lion, Nur Rofiqoh Eviana Putri, Graham A. Rance, Cara Moloney, Vincenzo Taresco, Valentina Cuzzucoli Crucitti, Hannah Constantin, Maria Inês Evangelista Barreiros, Laura Ruiz Cantu, Christopher J. Tuck, Felicity R.A.J. Rose, Richard J.M. Hague, Clive J. Roberts, Lyudmila Turyanska, Ricky D. Wildman, Yinfeng He
Additive manufacturing offers manufacture of personalised pharmaceutical tablets through design freedoms and material deposition control at an individual voxel level. This control goes beyond geometry and materials choices: inkjet based 3D printing enables the precise deposition (10–80 μm) of multiple materials, which permits integration of precise doses with tailored release rates; in the meanwhile, this technique has demonstrated its capability of high-volume personalised production. In this paper we demonstrate how two dissimilar materials, one water soluble and one insoluble, can be co-printed within a design envelope to dial up a range of release rates including slow (0.98 ± 0.04 mg/min), fast (4.07 ± 0.25 mg/min) and multi-stepped (2.17 ± 0.04 mg/min then 0.70 ± 0.13 mg/min) dissolution curves. To achieve this, we adopted poly-4-acryloylmorpholine (poly-ACMO) as a new photocurable water-soluble carrier and demonstrated its contemporaneous deposition with an insoluble monomer. The water soluble ACMO formulation with aspirin incorporated was successfully printed and cured under UV light and a wide variety of shapes with material distributions that control drug elution was successfully fabricated by inkjet based 3D printing technique, suggesting its viability as a future personalised solid dosage form fabrication routine.
{"title":"Enabling high-fidelity personalised pharmaceutical tablets through multimaterial inkjet 3D printing with a water-soluble excipient","authors":"Geoffrey Rivers, Anna Lion, Nur Rofiqoh Eviana Putri, Graham A. Rance, Cara Moloney, Vincenzo Taresco, Valentina Cuzzucoli Crucitti, Hannah Constantin, Maria Inês Evangelista Barreiros, Laura Ruiz Cantu, Christopher J. Tuck, Felicity R.A.J. Rose, Richard J.M. Hague, Clive J. Roberts, Lyudmila Turyanska, Ricky D. Wildman, Yinfeng He","doi":"10.1016/j.mtadv.2024.100493","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100493","url":null,"abstract":"Additive manufacturing offers manufacture of personalised pharmaceutical tablets through design freedoms and material deposition control at an individual voxel level. This control goes beyond geometry and materials choices: inkjet based 3D printing enables the precise deposition (10–80 μm) of multiple materials, which permits integration of precise doses with tailored release rates; in the meanwhile, this technique has demonstrated its capability of high-volume personalised production. In this paper we demonstrate how two dissimilar materials, one water soluble and one insoluble, can be co-printed within a design envelope to dial up a range of release rates including slow (0.98 ± 0.04 mg/min), fast (4.07 ± 0.25 mg/min) and multi-stepped (2.17 ± 0.04 mg/min then 0.70 ± 0.13 mg/min) dissolution curves. To achieve this, we adopted poly-4-acryloylmorpholine (poly-ACMO) as a new photocurable water-soluble carrier and demonstrated its contemporaneous deposition with an insoluble monomer. The water soluble ACMO formulation with aspirin incorporated was successfully printed and cured under UV light and a wide variety of shapes with material distributions that control drug elution was successfully fabricated by inkjet based 3D printing technique, suggesting its viability as a future personalised solid dosage form fabrication routine.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-13DOI: 10.1016/j.mtadv.2024.100495
D. Errandonea, H.H.H. Osman, R. Turnbull, D. Diaz-Anichtchenko, A. Liang, J. Sanchez-Martin, C. Popescu, D. Jiang, H. Song, Y. Wang, F.J. Manjon
In this work, we report evidence of pressure-induced changes in the crystal structure of Sr(IO)HIO connected to changes the coordination of the iodine atom and the of the configuration of HIO and IO units. The changes favor iodine hypercoordination and happen in two steps on sample compression. Firstly, at 2.5 GPa, [HIO]·[IO] complexes are formed, and secondly, at 4.5 GPa, these complexes form dimers of [HIO]·[IO]·[IO]·[HIO]. The evidence is obtained from a combined experimental and theoretical study performed up to 20 GPa. Synchrotron powder X-ray diffraction, Raman spectroscopy, and optical-absorption experiments have been complemented with density-functional theory calculations, including the study of the topology of the electron density. The changes observed in the crystal structure are related to the transformation of secondary (halogen) bonds into electron-deficient multicenter bonds. The paper also discusses the effect of pressure on the compressibility of the Sr(IO)HIO crystal structure, its phonons, the electronic band gap, and the refractive index. Sr(IO)HIO was found to be highly compressible with an anisotropic compressibility. The softening of the internal I–O vibrations of IO units was also observed, together with a decrease of the band-gap energy (from 4.1 eV at 0 GPa to 3.7 eV at 20 GPa), a band-gap crossing, and a change in the topology of the band structure, with Sr(IO)HIO transforming from a direct gap semiconductor at 0 GPa to an indirect gap semiconductor beyond 6 GPa.
{"title":"Pressure-induced hypercoordination of iodine and dimerization of I2O6H in strontium di-iodate hydrogen-iodate (Sr(IO3)2HIO3)","authors":"D. Errandonea, H.H.H. Osman, R. Turnbull, D. Diaz-Anichtchenko, A. Liang, J. Sanchez-Martin, C. Popescu, D. Jiang, H. Song, Y. Wang, F.J. Manjon","doi":"10.1016/j.mtadv.2024.100495","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100495","url":null,"abstract":"In this work, we report evidence of pressure-induced changes in the crystal structure of Sr(IO)HIO connected to changes the coordination of the iodine atom and the of the configuration of HIO and IO units. The changes favor iodine hypercoordination and happen in two steps on sample compression. Firstly, at 2.5 GPa, [HIO]·[IO] complexes are formed, and secondly, at 4.5 GPa, these complexes form dimers of [HIO]·[IO]·[IO]·[HIO]. The evidence is obtained from a combined experimental and theoretical study performed up to 20 GPa. Synchrotron powder X-ray diffraction, Raman spectroscopy, and optical-absorption experiments have been complemented with density-functional theory calculations, including the study of the topology of the electron density. The changes observed in the crystal structure are related to the transformation of secondary (halogen) bonds into electron-deficient multicenter bonds. The paper also discusses the effect of pressure on the compressibility of the Sr(IO)HIO crystal structure, its phonons, the electronic band gap, and the refractive index. Sr(IO)HIO was found to be highly compressible with an anisotropic compressibility. The softening of the internal I–O vibrations of IO units was also observed, together with a decrease of the band-gap energy (from 4.1 eV at 0 GPa to 3.7 eV at 20 GPa), a band-gap crossing, and a change in the topology of the band structure, with Sr(IO)HIO transforming from a direct gap semiconductor at 0 GPa to an indirect gap semiconductor beyond 6 GPa.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-13DOI: 10.1016/j.mtadv.2024.100494
Jaemin Kim, Seungwoo Son, Myeonggi Choe, Zonghoon Lee
With the increasing demand for production of graphitic materials for various applications, it becomes crucial to get a fundamental understanding of how graphene layers grow on metal catalysts. Here, we performed an heating transmission electron microscopy (TEM) study to understand the mechanism of graphitization of amorphous carbon (a-C) on Ni catalyst by following graphene growth at atomic resolution in real time. By discerning the NiC phase from the pure Ni phase during the graphitic carbon growth process, we demonstrate that growth occurs through the carbide graphitization of NiC. Additionally, during the graphitization, Ni diffusion has a crucial effect on the structure of the resulting graphene. Under our experimental conditions, we observed graphene contains islands of multilayers. Based on our experimental results, we suggest a mechanism for graphitization of the a-C/Ni system and explain the dynamics resulting from Ni diffusion. Our study can contribute to the control of graphitization by using Ni catalyst in the production of graphene and other graphitic materials.
随着各种应用领域对石墨材料生产的需求日益增长，从根本上了解石墨烯层如何在金属催化剂上生长变得至关重要。在此，我们进行了一项加热透射电子显微镜（TEM）研究，通过以原子分辨率实时跟踪石墨烯的生长，了解无定形碳（a-C）在镍催化剂上的石墨化机制。通过分辨石墨碳生长过程中的 NiC 相和纯 Ni 相，我们证明了生长是通过 NiC 的碳化物石墨化实现的。此外，在石墨化过程中，镍的扩散对生成的石墨烯的结构有着至关重要的影响。在我们的实验条件下，我们观察到石墨烯含有多层的岛屿。基于我们的实验结果，我们提出了 a-C/Ni 体系的石墨化机制，并解释了镍扩散所产生的动态变化。我们的研究有助于在石墨烯和其他石墨材料的生产中使用镍催化剂来控制石墨化。
{"title":"In situ TEM investigation of nickel catalytic graphitization","authors":"Jaemin Kim, Seungwoo Son, Myeonggi Choe, Zonghoon Lee","doi":"10.1016/j.mtadv.2024.100494","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100494","url":null,"abstract":"With the increasing demand for production of graphitic materials for various applications, it becomes crucial to get a fundamental understanding of how graphene layers grow on metal catalysts. Here, we performed an heating transmission electron microscopy (TEM) study to understand the mechanism of graphitization of amorphous carbon (a-C) on Ni catalyst by following graphene growth at atomic resolution in real time. By discerning the NiC phase from the pure Ni phase during the graphitic carbon growth process, we demonstrate that growth occurs through the carbide graphitization of NiC. Additionally, during the graphitization, Ni diffusion has a crucial effect on the structure of the resulting graphene. Under our experimental conditions, we observed graphene contains islands of multilayers. Based on our experimental results, we suggest a mechanism for graphitization of the a-C/Ni system and explain the dynamics resulting from Ni diffusion. Our study can contribute to the control of graphitization by using Ni catalyst in the production of graphene and other graphitic materials.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, micro-light emitting diodes array (μLEDs) with dimensions of 5 μm and 15 μm chip size were fabricated using Neutral Beam Etching (NBE) processes. Size-dependent issues of μLEDs processed by traditional inductively coupled plasma-reactive ion etching (ICPRIE) were alleviated by NBE technology, which exhibited lower equivalent resistance, turn-on voltage, and Ideality factor as compared with those of μLEDs by ICPRIE. Additionally, higher light output power of μLEDs processed by NBE with both 5 μm and 15 μm resulted in higher EQE 7.6 % and 7.7 % than those of μLEDs processed by ICPRIE. Furthermore, the size effect led to a decrease in EQE values of the ICPRIE sample by 0.4 %, but only a 0.1 % decay in NBE. Overall, samples fabricated by the NBE process exhibited superior optoelectronic characteristics. Finally, non-radiative recombination behaviors on the mesa sidewall were verified by cathodoluminescence analysis, showing significant decay in ICPRIE samples but not in NBE samples. These results demonstrated the potential of the NBE process for fabricating small chip sizes blue-light μLEDs required for high-brightness, high-efficiency, and high-resolution μLED displays.
{"title":"Performance improvement of blue light micro-light emitting diodes (< 20 μm) by neutral beam etching process","authors":"Yu-Hsuan Hsu, Yun-Cheng Hsu, Chien-Chung Lin, Yi-Hsin Lin, Dong-Sing Wuu, Hao-Chung Kuo, Seiji Samukawa, Ray-Hua Horng","doi":"10.1016/j.mtadv.2024.100496","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100496","url":null,"abstract":"In this study, micro-light emitting diodes array (μLEDs) with dimensions of 5 μm and 15 μm chip size were fabricated using Neutral Beam Etching (NBE) processes. Size-dependent issues of μLEDs processed by traditional inductively coupled plasma-reactive ion etching (ICPRIE) were alleviated by NBE technology, which exhibited lower equivalent resistance, turn-on voltage, and Ideality factor as compared with those of μLEDs by ICPRIE. Additionally, higher light output power of μLEDs processed by NBE with both 5 μm and 15 μm resulted in higher EQE 7.6 % and 7.7 % than those of μLEDs processed by ICPRIE. Furthermore, the size effect led to a decrease in EQE values of the ICPRIE sample by 0.4 %, but only a 0.1 % decay in NBE. Overall, samples fabricated by the NBE process exhibited superior optoelectronic characteristics. Finally, non-radiative recombination behaviors on the mesa sidewall were verified by cathodoluminescence analysis, showing significant decay in ICPRIE samples but not in NBE samples. These results demonstrated the potential of the NBE process for fabricating small chip sizes blue-light μLEDs required for high-brightness, high-efficiency, and high-resolution μLED displays.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-08DOI: 10.1016/j.mtadv.2024.100488
Ali Raza, Jahan Zeb Hassan, Usman Qumar, Ayesha Zaheer, Zaheer Ud Din Babar, Vincenzo Iannotti, Antonio Cassinese
Electrocatalysis utilizing 2D materials is an encouraging approach for advancing sustainable energy conversion technologies. This review explores the strategies employed to achieve robust electrocatalytic activity of 2D materials in key reactions, namely, the OER, HER, and CORR. The distinct structural and electrical characteristics of 2D materials offer opportunities for rapid catalytic performance, indicating significant energy efficiency and selectivity. We systematically discuss the factors governing the electrocatalytic efficiency of two-dimensional materials, including their intrinsic properties, surface modification techniques, heterostructure engineering, and the role of defects. Furthermore, we summarize the recent advances in experimental and theoretical studies to understand the fundamental mechanisms of 2D materials with respect to their catalytic behavior. For the HER, OER, and ORR, defect engineering, phase engineering, interface engineering, and heteroatom doping techniques have been explored. In addition, in the case of the CORR, surface modification, surface-structure tuning, and electrolyte and electrolyzer optimization strategies were examined. This review emphasizes prospective two-dimensional materials as efficient and sustainable electrocatalysts for energy conversion processes. Moreover, it provides future insights into this rapidly evolving field and highlights the possible challenges. In conclusion, it aims to serve as a remarkable resource for researchers seeking to harness the potential response of two-dimensional materials for sustainable energy conversion applications.
{"title":"Strategies for robust electrocatalytic activity of 2D materials: ORR, OER, HER, and CO2RR","authors":"Ali Raza, Jahan Zeb Hassan, Usman Qumar, Ayesha Zaheer, Zaheer Ud Din Babar, Vincenzo Iannotti, Antonio Cassinese","doi":"10.1016/j.mtadv.2024.100488","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100488","url":null,"abstract":"Electrocatalysis utilizing 2D materials is an encouraging approach for advancing sustainable energy conversion technologies. This review explores the strategies employed to achieve robust electrocatalytic activity of 2D materials in key reactions, namely, the OER, HER, and CORR. The distinct structural and electrical characteristics of 2D materials offer opportunities for rapid catalytic performance, indicating significant energy efficiency and selectivity. We systematically discuss the factors governing the electrocatalytic efficiency of two-dimensional materials, including their intrinsic properties, surface modification techniques, heterostructure engineering, and the role of defects. Furthermore, we summarize the recent advances in experimental and theoretical studies to understand the fundamental mechanisms of 2D materials with respect to their catalytic behavior. For the HER, OER, and ORR, defect engineering, phase engineering, interface engineering, and heteroatom doping techniques have been explored. In addition, in the case of the CORR, surface modification, surface-structure tuning, and electrolyte and electrolyzer optimization strategies were examined. This review emphasizes prospective two-dimensional materials as efficient and sustainable electrocatalysts for energy conversion processes. Moreover, it provides future insights into this rapidly evolving field and highlights the possible challenges. In conclusion, it aims to serve as a remarkable resource for researchers seeking to harness the potential response of two-dimensional materials for sustainable energy conversion applications.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140934550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-03DOI: 10.1016/j.mtadv.2024.100492
Daeyoung Chu, Sanghyun Kang, Gwon Kim, Juho Sung, Jaehyuk Lim, Yejoo Choi, Donghwan Han, Changhwan Shin
Utilizing Ag/HfO with nickel (Ni) as a barrier layer, a novel threshold switching (TS) device is devised to overcome challenges such as low reliability, high threshold voltage, and high leakage current. Compared against an Ag/Ti/HfO-based TS device, the Ag/Ni/HfO-based TS device exhibits improved electrical characteristics: yield enhancement from 31.7 % to 40.0 %, enhanced endurance from ∼10 cycles to ∼300 cycles, and suppression in off-state current (I) from 1.2 × 10 A to 5.2 × 10 A under a high compliance current (e.g., 10 A). The results obtained through transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM) support the evidence of those accomplishments. Reducing the effective area of the TS device improves control over erratically generated filaments and the electric field within the switching layer, resulting in enhanced performance such as a reduced threshold voltage (V ∼0.35 V), minimized V variability (∼0.01 V), decreased a threshold current (I, i.e., the leakage current in the off-state before activation, ∼5.2 × 10 A), and maximum conductance (∼5.0 × 10 S) of low-resistance state. These findings suggest that the optimized Ag/Ni/HfO-based TS device can serve as a practical solution for low-power applications.
{"title":"First integration of Ni barrier layer for enhanced threshold switching characteristics in Ag/HfO2-based TS device","authors":"Daeyoung Chu, Sanghyun Kang, Gwon Kim, Juho Sung, Jaehyuk Lim, Yejoo Choi, Donghwan Han, Changhwan Shin","doi":"10.1016/j.mtadv.2024.100492","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100492","url":null,"abstract":"Utilizing Ag/HfO with nickel (Ni) as a barrier layer, a novel threshold switching (TS) device is devised to overcome challenges such as low reliability, high threshold voltage, and high leakage current. Compared against an Ag/Ti/HfO-based TS device, the Ag/Ni/HfO-based TS device exhibits improved electrical characteristics: yield enhancement from 31.7 % to 40.0 %, enhanced endurance from ∼10 cycles to ∼300 cycles, and suppression in off-state current (I) from 1.2 × 10 A to 5.2 × 10 A under a high compliance current (e.g., 10 A). The results obtained through transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM) support the evidence of those accomplishments. Reducing the effective area of the TS device improves control over erratically generated filaments and the electric field within the switching layer, resulting in enhanced performance such as a reduced threshold voltage (V ∼0.35 V), minimized V variability (∼0.01 V), decreased a threshold current (I, i.e., the leakage current in the off-state before activation, ∼5.2 × 10 A), and maximum conductance (∼5.0 × 10 S) of low-resistance state. These findings suggest that the optimized Ag/Ni/HfO-based TS device can serve as a practical solution for low-power applications.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140934634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-05-03DOI: 10.1016/j.mtadv.2024.100491
Chae-Lin Park, Du Won Kim, Sujin Ryu, Joonmyung Choi, Young-Chul Song, Keon Jung Kim, Sang Won Lee, Seongjae Oh, Doyoung Kim, Young Hwan Bae, Hyun Kim, Seon-Jin Choi, Jaehoon Ko, Shi Hyeong Kim, Hyunsoo Kim
Carbon-based fibers have attracted attention in various field owing to their exceptional properties, including high tensile strength, thermal stability, and electrical conductivity. In particular, graphene-based high-strength fibers are promising materials in aerospace, automotive, and marine sectors. Recently, the hybrid fiber, consisting of carbon nanotubes (CNTs) and graphene with enhanced toughness was reported by deflecting cracks and enabling high deformation. However, complex synthesis and structural optimization of composite fiber with two different materials make challenge for mass production. Here, we introduce a novel graphene composite fiber, consisting of reduced graphene oxide (rGO) and scrolled rGO (SrGO), showing remarkable toughness. A multidimensional-state solution with 2D rGO and 1D SrGO was obtained by using a simple sonication technique. Mass production of high-toughness composite fibers was achieved via wet-spinning, with enhanced toughness attributed to microstructure optimization by controlling the SrGO ratio. Additionally, the use of poly(vinyl alcohol) (PVA) as the matrix facilitated high deformation, resulting in a remarkable 90.7 % increase in mechanical toughness without complex composite material synthesis.
{"title":"Wet-spinning of reduced graphene oxide composite fiber by mechanical synergistic effect with graphene scrolling method","authors":"Chae-Lin Park, Du Won Kim, Sujin Ryu, Joonmyung Choi, Young-Chul Song, Keon Jung Kim, Sang Won Lee, Seongjae Oh, Doyoung Kim, Young Hwan Bae, Hyun Kim, Seon-Jin Choi, Jaehoon Ko, Shi Hyeong Kim, Hyunsoo Kim","doi":"10.1016/j.mtadv.2024.100491","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100491","url":null,"abstract":"Carbon-based fibers have attracted attention in various field owing to their exceptional properties, including high tensile strength, thermal stability, and electrical conductivity. In particular, graphene-based high-strength fibers are promising materials in aerospace, automotive, and marine sectors. Recently, the hybrid fiber, consisting of carbon nanotubes (CNTs) and graphene with enhanced toughness was reported by deflecting cracks and enabling high deformation. However, complex synthesis and structural optimization of composite fiber with two different materials make challenge for mass production. Here, we introduce a novel graphene composite fiber, consisting of reduced graphene oxide (rGO) and scrolled rGO (SrGO), showing remarkable toughness. A multidimensional-state solution with 2D rGO and 1D SrGO was obtained by using a simple sonication technique. Mass production of high-toughness composite fibers was achieved via wet-spinning, with enhanced toughness attributed to microstructure optimization by controlling the SrGO ratio. Additionally, the use of poly(vinyl alcohol) (PVA) as the matrix facilitated high deformation, resulting in a remarkable 90.7 % increase in mechanical toughness without complex composite material synthesis.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140934632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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