Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?
作者:Tong Tong Hao、Si-Jia Guan、Dong Zhang、Peng Zhang、Yu Cao、Jianhua Hou、Nian-Tzu Suen
DOI:10.1021/acs.inorgchem.3c04601
日期:2024.3.18
demonstrates that with a proper combination between elements in intermetallic phases, one can manipulate d electrons of the active metal to be closer to the sweet spot (ΔGHad = 0). The Pt member may no longer exhibit the best HER activity in series, and all elements exhibit the potential to outperform the Pt member in the HER with careful control of the d electron population.
在此,合成了两个Laves金属间化合物系列ZrCo 1.75 M 0.25和NbCo 1.75 M 0.25 ( M = Fe、Co、Ni、Ru、Rh、Pd、Os、Ir和Pt),并进行了它们的析氢反应(HER)检查活性以揭示 d 电子对相应 HER 活性的影响。由于Zr和Nb之间的电负性不同(χ Zr = 1.33;χ Nb = 1.60),Co和/或M元素在ZrCo 1.75 M 0.25中比Nb元素接收更多电子。这导致与 NbCo 1.75 M 0.25相比,ZrCo 1.75 M 0.25系列的整体 H 吸附能 (Δ G Had ) 较弱,并且很好地合理解释了与 ZrCo 1.75中的 Pt 相比,Rh 成员具有优越的 HER 活性。 M 0.25系列。在工业条件下(333 K,6.0 M KOH),ZrCo 1.75 Rh 0.25只需要 110 mV 的过电位即可达到 500 mA/cm