低超电位可充电Na-CO2电池由富含氧气空位的氧化催化剂启动
Zhi Zheng1,2, Xiaobo Zheng1, Jicheng Jiang1
1Institute for Superconducting and Electronic Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia.
ACS applied materials & interfaces
|March 26, 2024
概括
可充电的二氧化碳 (Na-CO2) 电池显示出对二氧化碳利用的前景. 一种具有氧空位的新型Co3O4空洞球体催化剂显著提高了电池的性能和稳定性.
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
- 催化剂是一种催化剂.
背景情况:
- 可充电的二氧化 (Na-CO2) 电池为二氧化碳利用和发电提供了一条途径.
- 目前面临的挑战包括缓慢的动力学,高极化和Na-CO2电池的循环稳定性差.
研究的目的:
- 为可充电Na-CO2电池开发一种高效的空气阴极催化剂.
- 研究氧气空缺在增强二氧化碳电减和分解中的作用.
主要方法:
- 合成像兰布坦一样的Co3O4空洞球体,含有丰富的氧气空缺.
- 使用Co3O4作为Na-CO2电池中的空气阴极.
- 使用密度函数理论 (DFT) 计算来理解催化机制.
主要成果:
- 有氧空隙的Co3O4空洞球体显示出优异的CO2结合和电还原动力学.
- 由于氧气空缺,DFT的计算证实了增强的二氧化碳结合和降低的分解能障碍.
- 制造的Na-CO2电池实现了高放电容量 (8371.3 mA h g-1) 和良好的循环稳定性 (85个循环).
结论:
- 在Co3O4空洞球体中的氧气空缺对于加速CO2减排和提高Na-CO2电池效率至关重要.
- 开发的催化剂设计为推进可充电Na-CO2和Na-air电池提供了一个有前途的战略.
- 这项研究提供了关于催化剂设计的见解,以在储能设备中实际利用二氧化碳.
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