一个原子厚的六角化合催化剂用于增强氧气演化反应
Yizhen Lu1, Bixuan Li2,3, Na Xu1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Nature communications
|November 1, 2023
概括
六角化 (hBN) 作为电化学水分裂的高效联合催化剂,显著提高氧演化反应 (OER) 的性能. 这种一原子厚的材料可以将电流增强十倍,并且与商业催化剂相比显示出更高的质量活性.
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:
- 有效的共催化剂具有优化的界面特性,对于推进电化学水分裂和氧演化反应 (OER) 至关重要.
- 目前的OER催化剂在质量和电荷运输方面存在局限性,阻碍了整体的水分效率.
研究的目的:
- 调查一个原子厚的六边形化 (hBN) 作为增强开放能源效率的联合催化剂的潜力.
- 阐明负责提高hBN封装电极中的催化活性的接口机制.
主要方法:
- 封装各种电催化电极,用几厘米大小,密度高,无透的六角化 (hBN) 薄膜.
- 覆盖hBN的Ni-Fe (氧) 氧化阳极的电化学表征,包括Tafel斜率分析和电流密度测量.
- 同位素实验和模拟以探测反应机制和界面电子转移.
主要成果:
- 被hBN覆盖的Ni-Fe (氧) 氧化阳极表现出~30mV dec−1的超低Tafel斜率和反应电流的十倍增长 (~2000mA cm−2在~490mV超电位),持续超过150小时.
- hBN辅助催化剂的质量活性超过了商业催化剂的质量活动,高达五个数量级.
- 同位素实验和模拟表明,含氧的中间体吸附在绝缘hBN上,通过局部电子以最小阻抗促进deprotonation.
结论:
- 一个原子厚的六角化 (hBN) 作为一个高效的辅助催化剂的氧化演化反应 (OER) 在电化学水分裂.
- 增强的性能归因于hBN的独特接口特性,使得高效的电子传输和中间吸附.
- 这项研究为电极原子层的界面反应机制提供了关键的见解,为下一代电催化剂设计铺平了道路.
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