标题
作者
作者:Zhang, HP (Zhang, Houpo)[1 ]; Chen, ZW (Chen, Zhiwei)[1 ]; Hu, RZ (Hu, Renzong)[1 ]; Liu, J (Liu, Jun)[1 ]; Cui, J (Cui, Jie)[2 ]; Zhou, WJ (Zhou, Weijia)[3 ]; Yang, CH (Yang, Chenghao)[3 ]
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文献类型:Article
摘要
The huge decay in the reversible capacity and low initial coulombic efficiency (ICE) of a lithiated SnO2 film anode originate mainly from the limited reversibility of the conversion reaction. The inhibition of Sn coarsening is the key to promote the reversible conversion of Sn/Li2O to SnO2. Herein, we designed a double-layer electrode comprising a SnO2 layer (thickness of similar to 20 nm) coated with an Al2O3 layer by atomic layer deposition as a conceptual model. The Al2O3 coating (similar to 5 nm) on the surface and the interior filling of Al2O3 helped to increase the boundary integrity of SnO2 nanocrystals, and acted as a barrier to prevent lithiation-induced Sn coarsening during cycling, ensuring a highly reversible conversion reaction in the SnO2/Al2O3 film electrode. Thus, this SnO2/Al2O3 electrode contributed superior electrochemical performance with a higher ICE (88.1%) and better reversible capacity retention (88.9% after 200 cycles) than the pure SnO2 anode (30.6%); this demonstrated that the surface modification of nanograins of conversion-type anode materials could be helpful for enhancing the reversibility and cyclability of the electrode and enabling a high stable reversible capacity.
关键词
KeyWords Plus:LITHIUM-ION BATTERIES; ELECTRON-MICROSCOPY OBSERVATION; SNO2 ELECTRODES; ANODE MATERIALS; CAPACITY; OXIDE; COATINGS; STORAGE; INTERCALATION; NANOCOMPOSITE
作者信息
通讯作者地址:Hu, RZ (通讯作者)
 | South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China. |
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电子邮件地址:msrenzonghu@scut.edu.cn
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类别分类
研究方向:Chemistry; Energy & Fuels; Materials Science
Web of Science 类别:Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary
标题
作者
作者:Liu, BC (Liu, Baichen)[1 ]; Dai, WL (Dai, Wanlin)[1 ]; Lu, ZW (Lu, Zhiwei)[1 ]; Ye, JS (Ye, Jianshan)[1 ]; Ouyang, LZ (Ouyang, Liuzhang)[2 ]
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文献类型:Article
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In recent years, various platinum-free catalysts for the oxygen reduction reaction ( ORR) have attracted great attention due to the limited natural abundance and high cost of platinum. Herein, Ag@N-C ( N-C: nitrogen-doped carbon) nanorods for the ORR were synthesized through chemical polymerization and pyrolysis methods by using pyrrole and silver nitrate as raw materials. Pyrolysis could significantly increase the specific surface area of as-synthesized catalysts and convert pyrrolic-N into graphitic-N and pyridinic-N. The results of electrochemical tests show that the Ag@N-C-900 catalyst ( pyrolyzed at 900 degrees C) exhibits highly efficient ORR catalytic activity, improved stability, and better methanol resistance in comparison to that of Pt/C catalyst in alkaline media.
关键词
作者关键词:fuel cells; nanorods; nitrogen-doped carbon; oxygen reduction reaction; silver
作者信息
通讯作者地址:Ye, JS (通讯作者)
| South China Univ Technol, Key Lab Fuel Cell Technol Guangdong Prov, Sch Chem & Chem Engn, Guangzhou 510641, Guangdong, Peoples R China. |
| South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China. |
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电子邮件地址:jsye@scut.edu.cn; meouyang@scut.edu.cn
出版商
类别分类
研究方向:Chemistry
Web of Science 类别:Chemistry, Multidisciplinary