在80°C的性水电解中抑制活性位点的溶解,由Oxyanion工程进行电解
Wei Liu1, Xiaoqian Ding1, Jingjin Cheng1
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Angewandte Chemie (International ed. in English)
|May 29, 2024
概括
将氧离子添加到性水电解电解质中,可以显著抑制铁层双氧化物 (NiFe-LDH) 催化剂的溶解. 这种抑制减少了性能衰变,并提高了高温下催化剂的稳定性.
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:
- 商业性水电解剂在高温 (80°C) 上工作,以提高能效.
- 铁层双氧化物 (NiFe-LDH) 是有前途的阳极催化剂,但在高温下具有高溶解性.
- 催化剂溶解导致阳极降解和阴极失活,降低了整体电催化性能.
研究的目的:
- 研究性水电解中的NiFe-LDH催化剂的溶解机制.
- 开发抑制NiFe-LDH溶解和改善催化剂稳定性的策略.
- 为了证明氧离子作为溶解抑制剂的有效性.
主要方法:
- 在80°C的性电解质中对NiFe-LDH催化剂进行电化学测试.
- 在电解质中添加各种氧离子 (酸盐,酸盐,硫酸盐,碳酸盐).
- 分析催化剂降解和性能衰减率的分析.
主要成果:
- 确定NiFe-LDH溶解是性能衰退的一个关键因素.
- 添加酸盐使NiFe-LDH活性部位的损失在400mA cm-2.2时减少了三分之二.
- 通过添加酸盐,性能衰变率降低了25倍.
- 酸盐,硫酸盐和碳酸盐也表现出抑制作用.
结论:
- 氧化离子有效地抑制性水电解中的NiFe-LDH活性位点溶解.
- 这种抑制策略显著提高了催化剂的稳定性和在高温下寿命.
- 开发的方法提供了一种通用方法,用于提高高温水分裂中的电催化性能.
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