Pub Date : 2024-11-06DOI: 10.1016/j.matlet.2024.137634
Maria José Alves Oliveira , Gethzemani Mayeli Estrada Villegas , Larissa Otubo , Abril Fonseca García , Giovanni Gonzalez-Pérez , Pablo Antonio Salvador Vasquez
A modified electrolytic method that employed the suspension of silver ions (Ag+) and subsequent exposure to gamma radiation at doses of 10, 25, 50, and 70 kGy (kGy) formed the silver nanoparticles (AgNPs). The stability of the AgNPs was monitored over a period of 12 months using UV Vis Spectrophotometry (UV–Vis), Transmission electron microscope (TEM) and Dynamic light scattering (DLS). In particular, AgNPs irradiated at 10 kGy exhibited the most favorable stability of the samples tested, with the additional advantage of requiring less energy for production due to the lower dose employed.
{"title":"Assessment of long-term stability in silver nanoparticles generated by gamma radiation","authors":"Maria José Alves Oliveira , Gethzemani Mayeli Estrada Villegas , Larissa Otubo , Abril Fonseca García , Giovanni Gonzalez-Pérez , Pablo Antonio Salvador Vasquez","doi":"10.1016/j.matlet.2024.137634","DOIUrl":"10.1016/j.matlet.2024.137634","url":null,"abstract":"<div><div>A modified electrolytic method that employed the suspension of silver ions (Ag<sup>+</sup>) and subsequent exposure to gamma radiation at doses of 10, 25, 50, and 70 kGy (kGy) formed the silver nanoparticles (AgNPs). The stability of the AgNPs was monitored over a period of 12 months using UV Vis Spectrophotometry (UV–Vis), Transmission electron microscope (TEM) and Dynamic light scattering (DLS). In particular, AgNPs irradiated at 10 kGy exhibited the most favorable stability of the samples tested, with the additional advantage of requiring less energy for production due to the lower dose employed.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137634"},"PeriodicalIF":2.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-06DOI: 10.1016/j.matlet.2024.137684
Mazyar Ansari , Ehsan Toyserkani
This study investigates the feasibility of synthesizing a ZrCuAlNb bulk metallic glass composite through in-situ alloying of pure elemental powder blend using powder-fed laser-directed energy deposition. The process parameters are carefully optimized and multiple laser remelting is applied to address the chemical inhomogeneity and elemental micro-segregation. A detailed microstructural examination confirms the successful discovery and development of an amorphous-crystalline composite structure.
{"title":"In-situ alloying of a Zr-based bulk metallic glass composite via powder-fed laser additive manufacturing and pure elemental blend","authors":"Mazyar Ansari , Ehsan Toyserkani","doi":"10.1016/j.matlet.2024.137684","DOIUrl":"10.1016/j.matlet.2024.137684","url":null,"abstract":"<div><div>This study investigates the feasibility of synthesizing a ZrCuAlNb bulk metallic glass composite through in-situ alloying of pure elemental powder blend using powder-fed laser-directed energy deposition. The process parameters are carefully optimized and multiple laser remelting is applied to address the chemical inhomogeneity and elemental micro-segregation. A detailed microstructural examination confirms the successful discovery and development of an amorphous-crystalline composite structure.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137684"},"PeriodicalIF":2.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-06DOI: 10.1016/j.matlet.2024.137683
Sobia Rafique , Muhammad Shoaib Butt
This research focused on the development of an antimicrobial polymeric composite coating of polyethylene glycol (PEG) infused with zinc oxide nanoparticles (ZnO) and herbal extracts from Curcuma longa (turmeric). The synthesized composite is coated on a biodegradable vicryl suture via the dip coating method. Instrumental characterization, including Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), was utilized to confirm the chemical composition and surface of the coated suture. The antimicrobial activity was evaluated against bacterial pathogens, Gram-positive (Staphylococcus aureus and Enterococcus faecalis) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa). The water contact angle was measured to determine surface wettability. Degradation studies were conducted in simulated intestinal fluid (SIF) to determine the coated suture’s longevity.
{"title":"Intestinal incision site infections: Evaluation of antimicrobial-coated vicryl sutures in preventing postoperative infections","authors":"Sobia Rafique , Muhammad Shoaib Butt","doi":"10.1016/j.matlet.2024.137683","DOIUrl":"10.1016/j.matlet.2024.137683","url":null,"abstract":"<div><div>This research focused on the development of an antimicrobial polymeric composite coating of polyethylene glycol (PEG) infused with zinc oxide nanoparticles (ZnO) and herbal extracts from Curcuma longa (turmeric). The synthesized composite is coated on a biodegradable vicryl suture via the dip coating method. Instrumental characterization, including Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), was utilized to confirm the chemical composition and surface of the coated suture. The antimicrobial activity was evaluated against bacterial pathogens, Gram-positive (<em>Staphylococcus aureus</em> and <em>Enterococcus faecalis</em>) and Gram-negative (<em>Escherichia coli</em> and <em>Pseudomonas aeruginosa</em>). The water contact angle was measured to determine surface wettability. Degradation studies were conducted in simulated intestinal fluid (SIF) to determine the coated suture’s longevity.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137683"},"PeriodicalIF":2.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-05DOI: 10.1016/j.matlet.2024.137667
M.H. Wang , L. Zhang
Although Sn-based perovskite solar cells (PSC) have impressive conversion efficiency, their stability needs to be improved. Herein, 3,4,5-trifluorophenol (C6H3F3O) containing –F and –OH groups was introduced to improve the film stability and quality of FA0.75MA0.25SnI3. –F groups with low surface energy cause C6H3F3O to spontaneously migrate to the air-solution interface and attract the SnI64− octahedron to the solution-air surface through hydrogen bond interactions between –OH and I. This leads to preferential nucleation of dense, high-quality perovskite films at the solution-air surface and orderly growth from top to bottom. Additionally, C6H3F3O is bonded to the surface of the film, and the outward-facing hydrophobic –F groups effectively shield FA0.75MA0.25SnI3 from water infiltration. The C6H3F3O-doped PSC exhibited a champion efficiency of 10.47 % and long-term stability of over 1000 h, retaining 80 % of its initial efficiency (in N2).
{"title":"Preparation of efficient and stable FA0.75MA0.25SnI3 perovskite solar cells using passivation materials with multiple F hydrophobic group","authors":"M.H. Wang , L. Zhang","doi":"10.1016/j.matlet.2024.137667","DOIUrl":"10.1016/j.matlet.2024.137667","url":null,"abstract":"<div><div>Although Sn-based perovskite solar cells (PSC) have impressive conversion efficiency, their stability needs to be improved. Herein, 3,4,5-trifluorophenol (C<sub>6</sub>H<sub>3</sub>F<sub>3</sub>O) containing –F and –OH groups was introduced to improve the film stability and quality of FA<sub>0.75</sub>MA<sub>0.25</sub>SnI<sub>3</sub>. –F groups with low surface energy cause C<sub>6</sub>H<sub>3</sub>F<sub>3</sub>O to spontaneously migrate to the air-solution interface and attract the SnI<sub>6</sub><sup>4−</sup> octahedron to the solution-air surface through hydrogen bond interactions between –OH and I. This leads to preferential nucleation of dense, high-quality perovskite films at the solution-air surface and orderly growth from top to bottom. Additionally, C<sub>6</sub>H<sub>3</sub>F<sub>3</sub>O is bonded to the surface of the film, and the outward-facing hydrophobic –F groups effectively shield FA<sub>0.75</sub>MA<sub>0.25</sub>SnI<sub>3</sub> from water infiltration. The C<sub>6</sub>H<sub>3</sub>F<sub>3</sub>O-doped PSC exhibited a champion efficiency of 10.47 % and long-term stability of over 1000 h, retaining 80 % of its initial efficiency (in N<sub>2</sub>).</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137667"},"PeriodicalIF":2.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-05DOI: 10.1016/j.matlet.2024.137670
Nejib Ghazouani , Ali Raza , Ahmed Babeker Elhag
This study focuses on improving the material characterization of Recycled Aggregate Concrete (RAC) while minimizing its environmental impact. It explores the interaction between Shape Memory Alloy (SMA) fibers and fly ash (FA) in RAC. Comprehensive microstructural and mineralogical analyses were conducted using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), along with thermal assessments via Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG). SEM images consistently revealed hydration products, including calcium hydroxide and ettringite, across all specimens. The results indicate that incorporating SMA fibers significantly enhances FA-containing RAC by improving mechanical strength, thermal regulation, matrix densification, and crack control, effectively addressing the inherent weaknesses of recycled aggregates.
本研究的重点是改进再生骨料混凝土（RAC）的材料特性，同时最大限度地减少其对环境的影响。它探讨了形状记忆合金（SMA）纤维和粉煤灰（FA）在 RAC 中的相互作用。使用扫描电子显微镜（SEM）和 X 射线衍射（XRD）进行了全面的微观结构和矿物学分析，并通过热重分析（TGA）和差热分析（DTG）进行了热评估。所有试样的 SEM 图像都一致显示出水化产物，包括氢氧化钙和乙长石。研究结果表明，加入 SMA 纤维后，含 FA 的 RAC 在机械强度、热调节、基体致密化和裂纹控制方面都有明显改善，从而有效解决了再生骨料的固有缺陷。
{"title":"Synergistic effects of SMA fibers and fly ash on the material characterization of recycled aggregate concrete","authors":"Nejib Ghazouani , Ali Raza , Ahmed Babeker Elhag","doi":"10.1016/j.matlet.2024.137670","DOIUrl":"10.1016/j.matlet.2024.137670","url":null,"abstract":"<div><div>This study focuses on improving the material characterization of Recycled Aggregate Concrete (RAC) while minimizing its environmental impact. It explores the interaction between Shape Memory Alloy (SMA) fibers and fly ash (FA) in RAC. Comprehensive microstructural and mineralogical analyses were conducted using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), along with thermal assessments via Thermogravimetric Analysis (TGA) and Differential Thermogravimetry (DTG). SEM images consistently revealed hydration products, including calcium hydroxide and ettringite, across all specimens. The results indicate that incorporating SMA fibers significantly enhances FA-containing RAC by improving mechanical strength, thermal regulation, matrix densification, and crack control, effectively addressing the inherent weaknesses of recycled aggregates.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137670"},"PeriodicalIF":2.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-05DOI: 10.1016/j.matlet.2024.137665
Dajun Wu , Panyi Wu , Zhengpeng Xia , Xuekun Hong , Bin Qian , Paul K. Chu
Supercapacitors with large energy densities are required for commercial applications. Herein, the urchin-like and hexagonal MnCo2O4/SiC composite is prepared in situ on Ni foam. The urchin-like MnCo2O4/SiC consists of nanoneedle clusters with a length of about 10 μm and a diameter of 20 nm. The MnCo2O4/SiC||AC asymmetrical supercapacitor (ASCs) shows an energy density of 90.3 Wh/kg (1.73F cm−2) at a power density of 1.25 kW/kg together with 92.1 % retention of the specific capacitance after 10,000 cycles. The results reveal excellent properties and large commercial potential.
{"title":"SiC-induced modification of MnCo2O4 nanoneedles fabricated on Ni foam for binder-free electrodes in high-performance asymmetrical supercapacitors","authors":"Dajun Wu , Panyi Wu , Zhengpeng Xia , Xuekun Hong , Bin Qian , Paul K. Chu","doi":"10.1016/j.matlet.2024.137665","DOIUrl":"10.1016/j.matlet.2024.137665","url":null,"abstract":"<div><div>Supercapacitors with large energy densities are required for commercial applications. Herein, the urchin-like and hexagonal MnCo<sub>2</sub>O<sub>4</sub>/SiC composite is prepared <em>in situ</em> on Ni foam. The urchin-like MnCo<sub>2</sub>O<sub>4</sub>/SiC consists of nanoneedle clusters with a length of about 10 μm and a diameter of 20 nm. The MnCo<sub>2</sub>O<sub>4</sub>/SiC||AC asymmetrical supercapacitor (ASCs) shows an energy density of 90.3 Wh/kg (1.73F cm<sup>−2</sup>) at a power density of 1.25 kW/kg together with 92.1 % retention of the specific capacitance after 10,000 cycles. The results reveal excellent properties and large commercial potential.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137665"},"PeriodicalIF":2.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-05DOI: 10.1016/j.matlet.2024.137666
Zary Adabavazeh
Silicon wafers are essential for the semiconductor industry, providing the foundation for most integrated circuits. As demand for microelectronics grows, larger silicon wafers, have become crucial for increasing chip production and reducing manufacturing costs. However, the crystal separation phase during Czochralski (CZ) ingot growth is particularly challenging for larger ingots, often resulting in defects due to premature detachment (“popped-out” tails). This study investigates the popping-out stage of 18-inch ingots under varying heater power and ingot pull-out speed conditions. Photoluminescence (PL) imaging and a convolutional neural network (CNN) were used to analyze dislocation density in the silicon wafers. Results show that increasing the pull-out speed after detachment can significantly increase dislocation density, while pausing the ingot near the melt surface minimizes dislocations. Additionally, increasing heater power after detachment reduces dislocation density. The optimal condition for minimizing dislocation was found when heater power was doubled, and the ingot was paused near the melt surface for 30 min.
{"title":"Exploring popped-out phenomena in large-scale silicon ingot growth","authors":"Zary Adabavazeh","doi":"10.1016/j.matlet.2024.137666","DOIUrl":"10.1016/j.matlet.2024.137666","url":null,"abstract":"<div><div>Silicon wafers are essential for the semiconductor industry, providing the foundation for most integrated circuits. As demand for microelectronics grows, larger silicon wafers, have become crucial for increasing chip production and reducing manufacturing costs. However, the crystal separation phase during Czochralski (CZ) ingot growth is particularly challenging for larger ingots, often resulting in defects due to premature detachment (“popped-out” tails). This study investigates the popping-out stage of 18-inch ingots under varying heater power and ingot pull-out speed conditions. Photoluminescence (PL) imaging and a convolutional neural network (CNN) were used to analyze dislocation density in the silicon wafers. Results show that increasing the pull-out speed after detachment can significantly increase dislocation density, while pausing the ingot near the melt surface minimizes dislocations. Additionally, increasing heater power after detachment reduces dislocation density. The optimal condition for minimizing dislocation was found when heater power was doubled, and the ingot was paused near the melt surface for 30 min.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137666"},"PeriodicalIF":2.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The possibility of fabricating novel high-entropy oxides (HEOs) with one ultrahigh-entropy sublattice consisting of 13 cations in RE2A2O7 (RE = [La, Sm, Nd, Gd, Dy, Yb, Y, Er, Eu, Tb, Ho, Lu, Tm], A = Zr, Hf, Ti, Sn, Ce or Pr) is demonstrated. All the samples exhibited a pure pyrochlore-type or defective fluorite crystalline structure with various degrees of cation disordering. Particularly, RE2Ti2O7 and RE2Sn2O7 exhibited a pure pyrochlore-type structure with high degree of ordering, while RE2Ce2O7 and RE2Pr2O7 demonstrated a single fluorite type HEO structure. The results pave the way to fabricate RE2A2O7 HEOs with an ultrahigh-entropy sublattice and potential application as the ceramic layer in thermal barrier coatings.
{"title":"Synthesis and characterization of the RE2A2O7 oxides with an ultrahigh-entropy sublattice occupied by rare-earth elements","authors":"Evgeny Trofimov , Ahmad Ostovari Moghaddam , Ksenia Litvinyuk , Mariappan Anandkumar , Milena Efimova , Dmitry Mikhailov , Olga Zaitseva","doi":"10.1016/j.matlet.2024.137668","DOIUrl":"10.1016/j.matlet.2024.137668","url":null,"abstract":"<div><div>The possibility of fabricating novel high-entropy oxides (HEOs) with one ultrahigh-entropy sublattice consisting of 13 cations in RE<sub>2</sub>A<sub>2</sub>O<sub>7</sub> (RE = [La, Sm, Nd, Gd, Dy, Yb, Y, Er, Eu, Tb, Ho, Lu, Tm], A = Zr, Hf, Ti, Sn, Ce or Pr) is demonstrated. All the samples exhibited a pure pyrochlore-type or defective fluorite crystalline structure with various degrees of cation disordering. Particularly, RE<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> and RE<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub> exhibited a pure pyrochlore-type structure with high degree of ordering, while RE<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> and RE<sub>2</sub>Pr<sub>2</sub>O<sub>7</sub> demonstrated a single fluorite type HEO structure. The results pave the way to fabricate RE<sub>2</sub>A<sub>2</sub>O<sub>7</sub> HEOs with an ultrahigh-entropy sublattice and potential application as the ceramic layer in thermal barrier coatings.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137668"},"PeriodicalIF":2.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-04DOI: 10.1016/j.matlet.2024.137664
Cong Hong , Jihao Ji , Jingguang Huang , Yuanning Zhang , Liangkai Li
Constructing low-cost and efficient catalysts for electrocatalytic water splitting to produce hydrogen is of great significance. In this study, we successfully prepared NiMo/NiFe-LDH electrocatalysts with abundant coupled interfaces using a hydrothermal method and electrodeposition. The synergistic effect between the NiMo alloy and NiFe-LDH nanosheets induces charge redistribution at the interface and accelerates charge transfer, thus improving reaction kinetics and enhancing electrocatalytic performance. Experimental results show that at a current density of 10 mA cm−2, the HER overpotential of NiMo/NiFe-LDH is 35 mV, demonstrating excellent water-splitting performance. This work provides insights into the development of alloy/transition metal hydroxides for efficient water-splitting hydrogen production.
构建低成本、高效的电催化水分离制氢催化剂意义重大。本研究采用水热法和电沉积法成功制备了具有丰富耦合界面的 NiMo/NiFe-LDH 电催化剂。NiMo 合金与 NiFe-LDH 纳米片之间的协同效应诱导了界面上的电荷再分布并加速了电荷转移，从而改善了反应动力学并提高了电催化性能。实验结果表明，在电流密度为 10 mA cm-2 时，NiMo/NiFe-LDH 的 HER 过电位为 35 mV，表现出优异的分水性能。这项工作为开发合金/过渡金属氢氧化物以实现高效的分水制氢提供了启示。
{"title":"NiMo/NiFe-LDH heterostructured electrocatalyst for hydrogen production from water electrolysis","authors":"Cong Hong , Jihao Ji , Jingguang Huang , Yuanning Zhang , Liangkai Li","doi":"10.1016/j.matlet.2024.137664","DOIUrl":"10.1016/j.matlet.2024.137664","url":null,"abstract":"<div><div>Constructing low-cost and efficient catalysts for electrocatalytic water splitting to produce hydrogen is of great significance. In this study, we successfully prepared NiMo/NiFe-LDH electrocatalysts with abundant coupled interfaces using a hydrothermal method and electrodeposition. The synergistic effect between the NiMo alloy and NiFe-LDH nanosheets induces charge redistribution at the interface and accelerates charge transfer, thus improving reaction kinetics and enhancing electrocatalytic performance. Experimental results show that at a current density of 10 mA cm<sup>−2</sup>, the HER overpotential of NiMo/NiFe-LDH is 35 mV, demonstrating excellent water-splitting performance. This work provides insights into the development of alloy/transition metal hydroxides for efficient water-splitting hydrogen production.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137664"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-11-04DOI: 10.1016/j.matlet.2024.137663
Fuliang Liu , Xiaoshuang Luo , Xiong Zhou , Yin Shen , Junchen Chen , Xing Li , Xiaogang Zhang
The performance of the electrodes is closely related to the structure of the electrode sheet, and the construction of advanced electrodes is crucial for the lithium-ion diffusion process in high-performance lithium-ion batteries (LIBs). Hard carbon, with its irregular polycrystalline microstructure, is an ideal candidate material for the anode electrode of LIBs. However, its have some drawbacks such as low initial coulombic efficiency (ICE), low capacity and poor rate performance. In this work, two electrode casting approaches are proposed and tested in pouch cells, which are double-layer blade coated electrode and patterned coated electrode. The results show that both coating methods show a combination of high ICE and rate capability, exceeding the performance of conventional single-coated electrodes composed of the same material. The designed coating method improves the dynamics of lithium ion diffusion process in the electrode, and the magnification performance and comprehensive electrochemical performance are improved. The research has a wide application prospect and can provide design guidance for obtaining high-power batteries.
{"title":"Strategies for designing high-performance hard carbon anodes with enhanced lithium-ion diffusion and rate capability","authors":"Fuliang Liu , Xiaoshuang Luo , Xiong Zhou , Yin Shen , Junchen Chen , Xing Li , Xiaogang Zhang","doi":"10.1016/j.matlet.2024.137663","DOIUrl":"10.1016/j.matlet.2024.137663","url":null,"abstract":"<div><div>The performance of the electrodes is closely related to the structure of the electrode sheet, and the construction of advanced electrodes is crucial for the lithium-ion diffusion process in high-performance lithium-ion batteries (LIBs). Hard carbon, with its irregular polycrystalline microstructure, is an ideal candidate material for the anode electrode of LIBs. However, its have some drawbacks such as low initial coulombic efficiency (ICE), low capacity and poor rate performance. In this work, two electrode casting approaches are proposed and tested in pouch cells, which are double-layer blade coated electrode and patterned coated electrode. The results show that both coating methods show a combination of high ICE and rate capability, exceeding the performance of conventional single-coated electrodes composed of the same material. The designed coating method improves the dynamics of lithium ion diffusion process in the electrode, and the magnification performance and comprehensive electrochemical performance are improved. The research has a wide application prospect and can provide design guidance for obtaining high-power batteries.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137663"},"PeriodicalIF":2.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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