优化NiFeOOH的稳定性通过大电流密度的氧化水的氧化离子间隔,以优化NiFeOOH的稳定性
Xiaowen Zhang1, Yijie Zhang1, Yuan Gao1
1Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China.
Journal of colloid and interface science
|October 10, 2024
概括
将酸盐离子插入铁氧化 (NiFeOOH) 电催化剂中显著提高了性水分裂的稳定性. 这种修改防止了铁分离,使得在高电流密度下能够进行强大的氧气演化反应.
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:
- -铁氧化 (NiFeOOH) 是一种高活性电催化剂,用于性水分裂中的氧化演化反应 (OER).
- 在高电流密度下,NiFeOOH的长期稳定性受到铁 (Fe) 分离和催化剂降解的阻碍.
研究的目的:
- 通过插入氧化离子来提高NiFeOOH电催化剂的稳定性.
- 为了研究酸盐 (NO3-) 介质对OER的NiFeOOH性能和稳定性的影响.
主要方法:
- 用各种氧离子 (NO3-,PO43-,SO42-,SeO42-) 修饰的NiFeOOH基底的合成.
- 在高电流密度下进行电化学测试,以评估OER活性和长期稳定性.
- 理论计算以阐明稳定性增强的机制.
主要成果:
- 与酸盐 (NiFeOOH-NO3-) 交叠的NiFeOOH表现出最佳性能,在1 A cm-2.2时达到311 mV的超电位.
- NiFeOOH-NO3-表现出优越的稳定性,在100小时后只有3.33%的衰减,比原始的NiFeOOH (13.19%) 显著改善.
- 酸盐间隔有效地减轻了Fe分离,导致长期稳定性增加了四倍.
结论:
- 氧离子,特别是酸盐的互,加强了NiFeOOH中的Ni/Fe-O共价键.
- 这种稳定机制抑制了Fe的溶解,并增强了NiFeOOH的相稳定性.
- 这些发现为开发强大的基于NiFe的电催化剂提供了有希望的战略,用于高电流密度的水氧化.
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