铜铁矿型PdCoO2块体单晶的原位改性及其可逆吸氢和快速放氢性能
In situ modification of delafossite type PdCoO2 bulk single crystal for reversible hydrogen sorption and fast hydrogen evolution
摘要：
在铜铁矿型PdCoO 2中观察到非常高的电导率是当前非常感兴趣的，并且有一些证据表明，电子在PdCoO 2的块状晶体中流动时表现得像流体。因此，该材料是研究多相反应中电子转移过程的理想平台。在这里，我们报告使用散装单晶PdCoO 2作为一个有前途的析氢反应（HER）的电催化剂。仅31 mV的过电位导致10 mA cm^（-2）的电流密度，并具有高的长期稳定性。我们已经精确地确定，在表面层中形成应变Pd纳米团簇的电化学活化后，晶体表面结构被修改。这些纳米团簇表现出可逆的氢吸附和解吸，为氢的进入创造了更多的活性位点。具有超高电导率的PdCoO 2单晶体作为Pd纳米团簇的天然基底，为电子转移提供了高速通道
英文摘要：
The observation of extraordinarily high conductivity in delafossite-type PdCoO2 is of great current interest, and there is some evidence that electrons behave like a fluid when flowing in bulk crystals of PdCoO2. Thus, this material is an ideal platform for the study of the electron transfer processes in heterogeneous reactions. Here, we report the use of bulk single crystal PdCoO2 as a promising electrocatalyst for hydrogen evolution reactions (HERs). An overpotential of only 31 mV results in a current density of 10 mA cm^(-2), accompanied by high long-term stability. We have precisely determined that the crystal surface structure is modified after electrochemical activation with the formation of strained Pd nanoclusters in the surface layer. These nanoclusters exhibit reversible hydrogen sorption and desorption, creating more active sites for hydrogen access. The bulk PdCoO2 single crystal with ultra-high conductivity, which acts as a natural substrate for the Pd nanoclusters, provides a high-speed channel for electron transfer
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