MATERIALS CHARACTERIZATION
·
2024
·
IF 4.8
Zhaoyang Zheng,Dong Han,Hailong Zhang,Shilin Ma,An Du,Ruina Ma,Yongzhe Fan,Xue Zhao,Xiaoming Cao
The multi-layer composite filler metal (YG18 surface pre-plated with Co layer + Ag–Cu–In–Ti filler metal) was designed in this study. The mechanism of modulation of Co-depleted zone and shear strength of joints by Co plating was elucidated. A more significant Co-rich layer existed around the WC particles, meanwhile, the presence of plastical Ag–Cu–In ternary eutectic between the Ti Co layer and the YG18/TiC layer relieved the joint stress and ensured that no cracks were generated in the Ti Co layer. Under the condition that the width of the Co-depleted zone was smaller (less than 3 μm), the presence of the dispersed Ti 2 Cu particles surrounded by the plastic phases ternary eutectic and Cu [s, s] in the filler layer was superior in terms of preventing crack propagation and absorbing the stress concentration. The best modulation of the filler layer microstructure and the Co-depleted zone was achieved when the pre-plated Co layer was around 2.5 μm. The Co-depleted zone was reduced by 50%, and the shear strength of joints was increased by 49% to 291 MPa. The results of the study provide a new way to design new multilayer composite filler metal.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 49
·2104330
·
IF 30.849
Yali Sun,Pengfei Qiu,Wei Yu,Jianjun Li,Hongling Guo,Li Wu,Hao Luo,Rutao Meng,Yi Zhang,Shengzhong (Frank) Liu
As a low-cost substitute that uses no expensive rare-earth elements for the high-efficiency Cu(In,Ga)(S,Se) 2 solar cell, the Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cell has borrowed optimization strategies used for its predecessor to improve its device performance, including a profiled band gap and surface inversion. Indeed, there have been few reports of constructing CZTSSe absorber layers with surface inversion to improve efficiency. Here, a strategy that designs the CZTSSe absorber to attain surface modification by using n-type Ag 2 ZnSnS 4 is demonstrated. It has been discovered that Ag plays two major roles in the kesterite thin film devices: surface inversion and front gradient distribution. It has not only an excellent carrier transport effect and reduced probability of electron-hole recombination but also results in increased carrier separation by increasing the width of the depletion region, leading to much improved V OC and J SC . Finally, a champion CZTSSe solar cell renders efficiency as high as 12.55%, one of the highest for its type, with the open-circuit voltage deficit reduced to as low as 0.306 V (63.2% Shockley-Queisser limit). The band engineering for surface modification of the absorber and high efficiency achieved here shine a new light on the future of the CZTSSe solar cell.
研究领域:
材料科学
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光伏技术
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半导体物理
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表面工程
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能源材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Yaoyao Li,Yuanpeng Liu,Lanxin Xue,Wei Chen,Tianyu Lei,Anjun Hu,Jianwen Huang,Xuepeng Wang,Xianfu Wang,Bo Chen,Yin Hu,Chengtao Yang,Jie Xiong
Lithium metal batteries (LMBs) have great potential for next-generation rechargeable batteries due to the high theoretical capacity and ideal compatibility coupled with diverse cathode materials . However, the random Li deposition associated with the large local space charge caused by the anion depletion near the surface of anode, as well as the insufficient reduction of Li + related to the suppressed Li + solvation process induced by the electrostatic force between anion and cation hinder the development of high-energy-density LMBs. Herein, as evidenced theoretically and experimentally, we simultaneously eliminate the anion depletion region and promote the lithium salt dissociation by employing ZIF-67 with unsaturated metal sites as anionphilic additive to regulate anion distribution and weaken its bond with Li + . As a result, the short-circuit hazard is remitted in symmetrical cell with modified electrolyte at 3 mA cm −2 under capacity of 3 mAh cm −2 for more than 2000 h. As employed for the lithium-sulfur battery with high sulfur loading of 4.5 mg cm −2 , the modulated electrolyte enables the battery delivering an initial capacity of 713 mAh g −1 with decay rate of 0.05% per cycle over 100 cycles at 3 mA cm −2 . This work demonstrates an efficient and scalable strategy for constructing dendrite-free LMBs via eliminating the anion depletion region and facilitating the Li + solvation process.
研究领域:
电化学
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能源材料
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电池技术
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界面化学
·
材料科学
✓ 已验证
DOI
高影响因子
Microfluidics and Nanofluidics
·
2022
·Vol. 26
·期 11
·1-9
·
IF 3.09
Niu Bing-Su,Wang Yu-Hang,Lv Shuang,Yang Yu,Fang Fang,Song Yan-Yan,Wu Zhi-Yong
Charged components can be effectively separated and enriched based on ion concentration polarization (ICP) effect for sample clean up and enhancement of detection sensitivity in analytical chemistry. Concerning the role of electrolyte, current studies on electrokinetic stacking with ICP mainly focused on the ionic strength, and the knowledge about the type of supporting electrolyte (SE) is still poor. In this study, the significance of acid–base property of SE was systematically investigated based on an ICP interface established on a paper fluidic device with ion exchange membrane. Using colored ion probes for visualization of the effects, the ion depletion zone as the working area was applied for electrokinetic stacking. It has been shown that, besides the proper electroosmotic flow and ionic strength decided by neutral salt, the acid–base property of SE plays an important role for a successful stacking with ICP. The guideline for SE selection was proposed, and the mechanism was well explained by correlating the water dissociation effect and electric field/pH gradient (double gradients) at the ion depletion zone. This rule proposal is substantial for the design and operation of electrokinetic enrichment and separation of targeted species using ICP effect.
研究领域:
分析化学
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电化学
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微流控技术
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分离科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）