计时安培法
气泡
阴极
消费(社会学)
环境科学
工艺工程
材料科学
化学
计算机科学
电气工程
电极
工程类
操作系统
循环伏安法
社会科学
物理化学
社会学
电化学
作者
Mengxuan Li,Linfeng Yu,Hai Liu,Chuanyi Zhang,Jiazhan Li,Liang Luo,Xiaoming Sun
出处
期刊:Nano Research
[Springer Nature]
日期:2024-05-28
卷期号:17 (8): 6951-6959
被引量:3
标识
DOI:10.1007/s12274-024-6700-8
摘要
Zn-air batteries (ZABs) as a potential energy conversion system suffer from low power density (typically ≤ 200 mW·cm−2). Recently, three-dimensional (3D) integrated air cathodes have demonstrated promising performance over traditional two-dimensional (2D) plane ones, which is ascribed to enriched active sites and enhanced diffusion, but without experimental evidence. Herein, we applied a bubble pump consumption chronoamperometry (BPCC) method to quantitatively identify the gas diffusion coefficient (D) and effective catalytic sites density (ρEC) of the integrated air cathodes for ZABs. Furthermore, the D and ρEC values can instruct consequent optimization on the growth of Co embedded N-doped carbon nanotubes (CoNCNTs) on carbon fiber paper (CFP) and aerophilicity tuning, giving 4 times D and 1.3 times ρEC over the conventional 2D Pt/C-CFP counterparts. As a result, using the CoNCNTs with half-wave potential of merely 0.78 V vs. RHE (Pt/C: 0.89 V vs. RHE), the superaerophilic CoNCNTs-CFP cathode-based ZABs exhibited a superior peak power density of 245 mW·cm−2 over traditional 2D Pt/C-CFP counterparts, breaking the threshold of 200 mW·cm−2. This work reveals the intrinsic feature of the 3D integrated air cathodes by yielding exact D and ρEC values, and demonstrates the feasibility of BPCC method for the optimization of integrated electrodes, bypassing trial-and-error strategy.
科研通智能强力驱动
Strongly Powered by AbleSci AI