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一个多孔网络的-注射的IrO2纳米针与增强的质量活动为酸氧演化反应的多孔网络

Fei Hu¹, Peiyu Huang¹, Xu Feng¹

¹School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, P.R. China. mfhufei@fosu.edu.cn.

Materials horizons

|November 7, 2024

概括

兴奋剂增强了水电解的氧化 (IrO2) 催化剂,提高了活性和稳定性. 这一创新使得高效的生产与减少的使用.

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
催化剂是一种催化剂.

背景情况:

质子交换膜水电解器 (PEMWE) 对于的生产至关重要.
基于 (Ir) 的氧化演化反应 (OER) 电催化剂在活性,稳定性和成本方面面临挑战.
在提高群众活动的同时,尽量减少Ir的使用是关键策略.

研究的目的:

为中小型企业开发一个具有成本效益和高活性的开放式电源催化剂.
调查兴奋剂对IrO2晶体生长和OER性能的影响.
提高基于Ir的OER催化剂的内在活性和稳定性.

主要方法:

通过1D异型生长合成超长波配合的氧化物 (B-IrO2) 纳米针.
使用实验技术和密度函数理论 (DFT) 计算进行了B-IrO2的表征.
在用于PEM水电解的膜电极组件中评估了B-IrO2的OER活性和稳定性.

主要成果:

与未使用兴奋剂的IrO2相比,B-IrO2具有明显更高的OER质量活性 (3656.3 A gIr-1).
DFT的计算表明,B兴奋剂降低了*O到*OOH转换的能量障碍,并加强了Ir键.
在PEMWE的测试中,电流密度为2.8 A cm-2,在1.0 A cm-2下稳定运行160小时.

结论:

兴奋剂促进了IrO2的1D异型增长,增强了电子导电性和活性位点.
B-IrO2为OER提供了卓越的内在活性和稳定性,减少了对贵金属的依赖.
这项工作提供了一个有前途的方法,通过PEMWE有效和经济地生产气.

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