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
The C14phaseNb(Cr1-xCox)(2) forms within a broad homogencity range of 0.127(3) <= x <= 0.937(8) at 1100 degrees C. The distribution of chromium and cobalt atoms on the crystallographic positions 2a and 6h has been studied by a single crystal structure analysis and a statistical mechanics approach using energies from firs-principles full potential electronic structure calculations. For the first time