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高活性CoNi-CoN3复合材料站点协同加速可充电空气电池中的氧气电极反应
Nan Li1, Mingzi Sun2, Jiaxiang Xiao1
1College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081, China.
Small (Weinheim an der Bergstrasse, Germany)
|March 3, 2024
概括
这项研究引入了一种新的CoNi-CoN3复合催化剂,用于可充电的空气电池 (ZAB). 催化剂显著增强氧降解 (ORR) 和氧演化 (OER) 反应,从而提高了电池性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高效的可充电空气电池 (ZAB) 需要具有快速运动的催化剂来减少氧 (ORR) 和氧演化 (OER).
- 开发先进的电催化剂对于提高ZAB的性能和实用性至关重要.
研究的目的:
- 构建和描述一种新的CoNi-CoN3复合催化剂,其支持在化碳纳米板矩阵上.
- 调查复合物的ORR和OER在ZAB中的电催化活性.
- 阐明增强催化性能背后的机制.
主要方法:
- 在化碳纳米板矩阵 (CoNi-CoN3/C) 中合成一个CoNi-CoN3复合催化剂.
- 电化学表征包括ORR半波电位测量和OER超电位测量.
- 理论计算 (例如,DFT) 以了解电子结构的修改和反应机制.
主要成果:
- CoNi-CoN3/C催化剂的半波潜力高于ORR的RHE,为0.88V,ORR的RHE为0.88V,OER的低超电位为360mV,OER为10mA cm-2.
- 理论计算显示,CoNi合金调节电子分布,向下移动d频段中心,并稳定活性位点,优化吸附中间体.
- 使用CoNi-CoN3/C的可充电ZAB显示出高功率密度 (250 mW cm-2) 和特定容量 (804 mAh g-1).
结论:
- 合金纳米粒子和N-化碳矩阵中的合金纳米粒子和3部分之间的协同相互作用显著增强了ORR和OER的电催化活性.
- 开发的催化剂为设计先进的储能器件的高性能金属/碳 (M-N-C) 催化剂提供了一个有前途的途径.
- 了解金属纳米粒子和M-Nx位点之间的相互作用是推进ZAB技术的关键.
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