表面与硫基团结的氧气进化催化剂用于质子交换膜水电解的电解
Jingjing Li1, Shuqing Fu2, Ruijie Wang1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, China.
Nature communications
|November 11, 2025
概括
通过共价键将硫酸组移植到氧化催化剂上,可以增强质子运输和氧演化反应动力学. 这种稳定,高性能的催化剂促进了能源转换应用.
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
背景情况:
- 质子运输对于氧进化反应 (OER) 是至关重要的.
- 氧化 (IrOx) 是稳定的,但在高电流密度下缺乏活性.
- 硫酸盐可以改善质子转移,但会遭受液,损害稳定性.
研究的目的:
- 为氧气演化反应开发一种稳定,高活性的电催化剂.
- 为了研究共价键的硫酸组对催化剂性能的影响.
- 为了解决与传统的硫酸盐结合相关的漏问题.
主要方法:
- 合成了一种硫酸 (SO3H) 移植的催化剂,Ir/IrOx~SO3H,具有共价键.
- 在质子交换膜水电解 (PEMWE) 细胞中测试了催化剂.
- 评估了高电流密度 (3.0 A cm-2) 的催化剂稳定性和活性.
主要成果:
- Ir/IrOx~SO3H在3.0 A cm-2时实现了1.75 V的电池电压,超过了商业的IrOx.
- 催化剂在1000多个小时内稳定运行,没有硫酸盐漏.
- 共价键增强了质子转移,促进了OOH中间体的形成,加速了OER动力学.
- 升高的表面电位减少了颗粒聚合,有助于膜电极组装.
结论:
- 联硫酸组显著增强了OER的活性和稳定性.
- 开发的Ir/IrOx~SO3H催化剂是能量转换的一个有希望的候选者.
- 这种强大的结合策略为先进的硫酸盐移植电催化剂提供了途径.
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