金属氧化物的电催化对散装的敏感性:氧化物的进化
Evan V Miu1, James R McKone1, Giannis Mpourmpakis1
1Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, United States.
Journal of the American Chemical Society
|March 15, 2022
概括
大量间隔,而不是表面变化,驱动三氧化物 (WO3) 电催化剂活性用于演化反应 (HER). 这种介质改变了酸性质,并防止了水化阻断,从而实现了有效的催化.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 由于成本和可调性,金属氧化物是有前途的电催化剂.
- 在反应条件下金属氧化物的化学变化使其研究复杂化.
- 了解电催化中的活性位点对于优化至关重要.
研究的目的:
- 研究三氧化物 (WO3) 中散装的作用,用于演化反应 (HER).
- 要确定表面或散装修改是否控制WO3的电催化活性.
- 阐明介质增强HER性能的机制.
主要方法:
- 结合了实验和计算方法.
- 密度函数理论 (DFT) 计算以建模电子结构和反应路径.
- 模拟反应速率的第一原则微动力模型.
主要成果:
- 在WO3中,批量干,而不是表面过程被确定为HER活性的关键因素.
- DFT的计算显示,介质改变了表面的酸性质,并防止了水合.
- 微动力学建模证实,只有间隔的HWO3解释了实验中的HER率.
结论:
- 对于HER中的WO3的电催化活性而言,间是至关重要的.
- 这一发现将重点从表面机制转移到金属氧化物电催化中的大量修改.
- 这项研究强调了在水性正极电催化中考虑散装结构变化的重要性.
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