通过化TiO2纳米管阵列的表面作用激活,以提高进化反应性能
Mila N Krstajić Pajić1, Ana S Dobrota2, Anca Mazare3,4
1University of Belgrade - Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia.
ACS applied materials & interfaces
|June 21, 2023
概括
化TiO2纳米管阵列使金组金属的成为演化反应的高度活性电催化剂. 这种具有成本效益的方法减少了催化剂负载,并提高了酸性水电解的效率.
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:
- 高效的演化反应 (HER) 电催化剂对于酸性水的电解至关重要.
- 目前对昂贵的组金属 (PGM) 的依赖需要降低PGM含量和减轻H吸附.
- 奥斯 (Os) 是一种较少探索的PGM,具有 HER 催化潜力.
研究的目的:
- 研究化TiO2纳米管 (TNT) 阵列作为沉积的支架的潜力.
- 为了优化合成条件,创造高活性的Os@TNT HER电催化剂.
- 了解Os与化TiO2.2之间的协同电子相互作用.
主要方法:
- Os粒子在化TiO2纳米管阵列上的电沉积.
- 合成参数的系统变化 (OsCl3度,温度,反应时间).
- HER性能和稳定性的电化学表征.
- 密度函数理论 (DFT) 计算以探测接口相互作用.
主要成果:
- 优化的Os@TNT复合物 (3 mM/55 °C/30 分钟) 实现了低超电位 (61 mV 在 100 mA cm-2) 和高质量活性 (20.8 A mgOs-1 在 80 mV).
- 亚纳米级的Os粒子均地覆盖了TNT的内壁.
- 在酸性介质中观察到稳定的性能.
- 由于强烈的TiO2-Os相互作用,DFT计算显示了Os-H*结合的减弱.
结论:
- 化TiO2纳米结构有效调节Os吸附特性,以增强HER活性.
- 通过优化合成条件,可以制造具有成本效益的Os@TNT催化剂.
- 在OssideTiO2接口上的协同电子效应显著提高了内在的HER活动.
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