接口工程诱导的电荷重新排列增强了异质FeCo-MnO@N-doped碳纳米盒的可逆氧电催化活性
Ying Ye1, Lei Zhang2, Qiliang Zhu1
1School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, PR China.
Journal of colloid and interface science
|July 22, 2023
概括
研究人员开发了一种新型的双功能氧催化剂,使用N-化碳纳米盒中的MnO-FeCo异质连接. 这种先进的电催化剂显著提高了氧气减少和演化反应的性能,这对于优化空气电池至关重要.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 双功能氧催化剂对于高效的空气电池至关重要,但开发高性能催化剂仍然是一个挑战.
- 优化催化剂需要了解内在电场和支持载体效应,以改善电催化活动.
研究的目的:
- 在N-doped碳纳米盒上设计和合成MNO-FeCo异质连接中的一个新的Mott-Schottky催化站点.
- 研究固有电场和空洞/多孔支载体对电催化剂性能的影响.
- 为了评估催化剂在氧减少反应 (ORR) 和氧演化反应 (OER) 中的有效性,用于空气电池.
主要方法:
- 在MNO-FeCo异质连接中加入一个Mott-Schottky催化位点.
- 使用N-doped碳纳米盒作为一个空洞/多孔的支持.
- 在性条件下对异质催化剂的电化学性能进行表征.
主要成果:
- 催化剂实现了0.88V的半波潜力和5.62mA/cm2的ORR限制电流密度.
- 催化剂在OER的10mA/cm2时显示出271mV的低超电位.
- 由此产生的空气电池具有0.621V的电位间隙,253mW/cm2的功率密度,761mAh/gZn的特定容量和336小时的稳定性.
结论:
- 通过内部电场调节催化剂表面电荷分布,可以提高双功能氧催化剂的性能.
- 通过空洞/多孔支来促进质量传输是强大的电催化剂设计的关键.
- 这种方法为开发空气电池等储能应用的先进催化剂提供了一个有前途的战略.
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