在接近中性pH条件下,工程高价值金属丰富的氧化催化剂可用于增强OER
Ruijing Dong1,2, Jiajian Gao2, Truong-Giang Vo2
1School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu, 610065, China. chuwei1965@scu.edu.cn.
Nanoscale
|June 10, 2024
概括
开发高效的电催化剂,用于将水分解为中性溶液,是生产的关键. 这项研究引入了Mo-Co(OH) 2纳米薄膜,在近中性pH下有效催化氧演化反应 (OER),为海水利用铺平了道路.
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:
- 在中性介质中的电化学水分解对于可持续的生产至关重要,特别是从海水中生产.
- 在开发高效的氧化演化反应 (OER) 和在中性电解质中减少水反应 (WRR) 的电催化剂方面,仍然存在重大挑战.
研究的目的:
- 设计和合成新的二维 (2D) 过渡金属氧化物,其中包含高价值元素,用于在中性介质中高效的OER.
- 研究设计的电催化剂的操作转换和活性物种.
- 通过现场光谱学研究阐明增强OER活动的机制.
主要方法:
- 合成二维的Mo-Co(OH) 2纳米片.
- 电化学表征包括超电位和Tafel斜率测量在0.5M KHCO3.3.
- 在现场X射线吸收光谱 (XAS) 用于在OER期间研究电子结构和活性位点.
主要成果:
- 优化的Mo-Co(OH) 2纳米板在10 mA cm-2时表现出550 mV的超电位,Tafel斜率为110.1 mV dec-1.
- 观察到Operando转化为氧化的活性物种.
- 在现场XAS证实了CoOOH活性位点生成的便利性和由于高价值元件的纳入而增强的电子转移动力学.
结论:
- 将高价值元素纳入过渡金属氧化物是开发在中性介质中高效的OER电催化剂的有效策略.
- 该研究提供了对近中性pH的OER反应机制的见解,支持开发用于海水利用的催化剂.
- ---2纳米板显示出作为可持续生产的高效电催化剂的前景.
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