高活性和稳定的酸过渡金属催化剂,用于全水分解
Gong Zhang1, Guichang Wang2, Yang Liu3
1University of Chinese Academy of Sciences, Beijing 100039, China.
Journal of the American Chemical Society
|November 1, 2016
概括
使用植物酸合成的过渡金属化物 (TMP) 催化剂提供了一种新的,简单的方法来有效地进行全水分解. 氧的结合增强了导电性,并激活了位点,使得没有贵金属的有效和氧进化反应.
科学领域:
- 材料科学
- 催化剂
- 可再生能源
背景情况:
- 过渡金属化物 (TMP) 是水分裂的有希望的催化剂,对于解决能源危机至关重要.
- 目前的合成方法往往缺乏通用性,增强催化活性需要进一步的研究.
- 电子结构调节为开发通用TMP合成提供了一种简单但重要的方法.
研究的目的:
- 为过渡金属化物 (TMP) 催化剂开发一种新且通用的合成方法.
- 研究将氧原子纳入TMP对它们在水分解中的催化性能的影响.
- 展示这些TMP在实际,无贵金属水分离应用中的潜力.
主要方法:
- 通过酸 (PA) 交联金属复合物的热解来制造TMP.
- 将氧原子纳入TMP结构.
- 在酸性和性介质中对演变反应 (HER) 和氧演变反应 (OER) 进行电催化试验.
- 将TMP集成到柔性碳布基板上
主要成果:
- 氧的加入增强了TMP的电导性,并通过延长M-P键激活了催化位.
- 在20 mA·cm-2时,MoP催化剂显示出较低的HER超电位 (118 mV在H2SO4中,93 mV在KOH中).
- CoP催化剂表现出高效的OER,在10 mA·cm-2时具有280 mV的超电位.
- 碳布上的TMP促进了电子转移,从而提高了催化活性.
- 一个性电解仪在1.6V时实现了40mA·cm-2的整体水分离.
结论:
- 使用植物酸的新型热解方法提供了合成含氧TMP的通用途径.
- 加入氧气是增强HER和OER的TMP催化活性的一个关键策略.
- 开发的TMP显示了高效和实用的无贵金属水分装置的巨大潜力.
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