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双原子Co/Ni电催化剂固定在表面修改的Ti3C2T上,MXene使高效的和氧演化反应成为可能

Xin Zhao¹, Wan-Peng Li¹, Yanhui Cao²

¹Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong S.A.R. 999077, P.R. China.

|January 24, 2024

概括

研究人员开发了一种新的基于MXene的双原子催化剂,使用L-三,用于高效的和氧演化反应. 这种先进的电催化剂显示了能量转换系统的增强活性和稳定性.

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:

在导电基板上的双原子催化剂加速和氧演化反应 (HER和OER).
双原子电催化剂的MXenes是有前途的基质,但需要有效的定策略.
对于MXene支持的催化剂来说,实现高质量负荷和强烈的金属基板相互作用至关重要.

研究的目的:

为MXene基板开发一个高效的表面修饰策略,以定双原子电催化剂.
在改造的MXene上研究Co/Ni双原子催化剂的电子结构和催化性能.
为了提高和氧进化反应的动力学和稳定性,使用新的基于MXene的催化剂.

主要方法:

在Ti3C2Tx MXene的表面修饰中使用L-三.
将双原子/ (Co/Ni) 电催化剂沉积到改性MXene基板上.
催化剂的结构,组成和金属基板相互作用 (N-Co/Ni-O键) 的表征.
对演变反应 (HER) 和氧演变反应 (OER) 的性能和稳定性的电化学测试.

主要成果:

使用L-托的新型表面修饰策略使得Co/Ni在Ti3C2Tx MXene上的双原子位点能够有效地定.
实现了5.6%重量%的高质量负载CoNi,形成有利的N-Co/Ni-O键.
CoNi-Ti3C2Tx电催化剂在10 mA cm-2.2时对HER (31 mV) 和OER (241 mV) 呈现出较低的超电位.
对于 HER 和 OER,在 500 mA cm-2 的100多个小时内被证明具有出色的运行稳定性.

结论:

通过L-氨酸介导的定策略有效地提高了MXene基板上的双原子催化剂性能.
电子移位和优化中间吸附有助于提高HER和OER动力学.
开发的CoNi-Ti3C2Tx电催化剂显示了高效和稳定的能源转换和储存系统的巨大潜力.

关键词:

这是一种MXene基质.L-三丹分子双原子电催化剂的电催化剂气演化反应反应的反应氧气进化反应反应氧气进化反应

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