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The observation of extraordinarily high conductivity in delafossite-typePdCoO2 is of great current interest, and there is some evidence that electronsbehave like a fluid when flowing in bulk crystals of PdCoO2. Thus, thismaterial is an ideal platform for the study of the electron transfer processesin heterogeneous reactions. Here, we report the use of bulk single crystalPdCoO2 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 thecrystal surface structure is modified after electrochemical activation with theformation of strained Pd nanoclusters in the surface layer. These nanoclustersexhibit reversible hydrogen sorption and desorption, creating more active sitesfor hydrogen access. The bulk PdCoO2 single crystal with ultra-highconductivity, which acts as a natural substrate for the Pd nanoclusters,provides a high-speed channel for electron transfer

In situ modification of delafossite type PdCoO2 bulk single crystal for reversible hydrogen sorption and fast hydrogen evolution