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高性能空气电池的超耐用双功能氧气电催化剂
Chenhui Zhou1, Xiao Chen1, Shuo Liu2
1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Journal of the American Chemical Society
|February 1, 2022
概括
这项研究引入了Mn-doped RuO2作为可充电空气电池的高效和耐用的双功能电催化剂,显著改善了氧减和演化反应.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 可充电的空气电池需要高效的双功能电催化剂来减少氧气 (ORR) 和氧气演变 (OER).
- 开发具有高活性和耐久性的催化剂对于实际应用至关重要.
- 需要精确控制原子和电子结构以实现协同效应.
研究的目的:
- 开发一种新的双功能电催化剂,以提高空气电池的ORR和OER性能.
- 在原子层面研究二氧化与的协同效应.
- 评估催化活性,耐用性和电池的整体性能.
主要方法:
- 原子尺度的Mn-doped RuO2 (Mn-RuO2) 双金属氧化物的合成.
- 使用循环电量计 (CV) 等技术对ORR和OER活性和耐久性的电化学表征.
- 使用Mn-RuO2催化剂制造和测试空气电池.
- 理论计算 (例如,DFT) 来了解电子结构和吸附特性.
主要成果:
- Mn-RuO2表现出显著的ORR/OER活性,电位差 (ΔE) 低至0.64V.
- 催化剂表现出极好的耐用性,在25万次心力循环 (ORR) 和3万次心力循环 (OER) 后的衰变是微不足道的.
- 使用Mn-RuO2的气电池显示出高功率密度 (181 mW cm-2) 和在各种电流密度下超长的寿命.
结论:
- 二氧化是可充电空气电池的非常有前途的双功能电催化剂.
- 原子规模的化优化了电子结构,从而提高了催化性能和耐用性.
- 催化剂的性能归因于优化的价值状态和中间吸附的d带中心.
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