在N-Doped碳中对双 Co,Ni 活性站点的协调工程促进可逆氧气电催化
Greesh Kumar1, Ramendra Sundar Dey1
1Institute of Nano Science and Technology (INST), Sector-81, Mohali 140306, Punjab, India.
Inorganic chemistry
|August 10, 2023
概括
这项研究引入了可充电空气电池的新型--化碳催化剂. 这种双功能催化剂有效地处理氧减和演化反应,改善能量储存性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 可再生能源可再生能源是可再生能源.
背景情况:
- 价格实惠的非贵金属可逆氧电催化剂对于金属空气电池 (MAB) 来说至关重要.
- 活跃站点的双功能性和稳定性是可充电MAB的关键挑战.
- 现有的催化剂往往患有非双功能性和活性部位退化,限制长期性能.
研究的目的:
- 为可充电的空气电池 (ZAB) 开发一种新的双功能电催化剂.
- 解决非贵金属催化剂在双功能性和稳定性方面的局限性.
- 为高效的氧气电催化合成双过渡金属--化碳材料.
主要方法:
- 采用了一种简单可控的化学合成方法.
- 合成了纳入添加碳 (CoNi-NC) 的双过渡金属 (和).
- 催化剂的结构具有空间隔离的Ni-N4和Co-N4活性位点,用于不同的反应.
主要成果:
- 该CoNi-NC材料在氧降解反应 (ORR) 和氧演化反应 (OER) 两方面都表现出双功能活性.
- 达到了0.72V的优异的DE值,超过了许多报告的双功能电催化剂.
- 催化剂的半波电位为ORR的0.83V,OER的超电位为330mV (vs RHE).
- 配备CoNi-NC的ZAB实现了194mW cm-2.2的峰值功率密度.
结论:
- 开发的CoNi-NC催化剂为可充电ZAB中的双功能氧气电催化提供了一个有希望的解决方案.
- 合成策略为创建具有双活性位点的先进电极材料提供了一条途径.
- 这项工作有助于推进高效的电化学能量储存和转换系统.
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