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Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

机译:AgPd(111)合金上的析氢电催化

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Recent studies on AuPd(111) alloy surfaces display unexpected hydrogen evolution reaction activities-a unique activity of AuPd alloys with surface fractions of -20% Pd was found. We investigated if this phenomenon also occurs with AgPd alloys. We first deposited Pd on a Ru (0001) substrate. After annealing, cyclic voltammetry investigations showed the same characteristics as Pd(111) single crystals. During Ag deposition, cyclic voltammetry experiments disclose underpotential deposition of Ag on the Pd film just as on Pd(111). AgPd alloys were formed by further annealing, and strong enrichment of Ag at the surface is observed. Using this approach, we prepared various bulk compositions at a film thickness of ~20 monolayers. Most AgPd alloys show a higher electrocatalytic activity than Ag or Pd alone. The activity trends match those seen with AuPd alloys.
机译:AuPd(111)合金表面的最新研究显示出意外的氢释放反应活性-发现表面分数为-20%Pd的AuPd合金的独特活性。我们研究了AgPd合金是否也会出现这种现象。我们首先在Ru(0001)衬底上沉积Pd。退火后,循环伏安法研究显示出与Pd(111)单晶相同的特性。在银沉积过程中,循环伏安法实验揭示了银在Pd膜上的电位不足,就像在Pd(111)上一样。通过进一步退火形成AgPd合金,并观察到表面Ag的强烈富集。使用这种方法,我们制备了约20个单层膜厚度的各种本体组合物。大多数AgPd合金比单独的Ag或Pd具有更高的电催化活性。活性趋势与AuPd合金的趋势相吻合。

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