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Springer Science and Business Media LLC Nature Communications 14(1)
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    초록·키워드

    Electrochemical hydrogen evolution reaction in neutral media is listed as the most difficult challenges of energy catalysis due to the sluggish kinetics. Herein, the Ir-H<sub>x</sub>WO<sub>3</sub> catalyst is readily synthesized and exhibits enhanced performance for neutral hydrogen evolution reaction. H<sub>x</sub>WO<sub>3</sub> support is functioned as proton sponge to create a local acid-like microenvironment around Ir metal sites by spontaneous injection of protons to WO<sub>3</sub>, as evidenced by spectroscopy and electrochemical analysis. Rationalize revitalized lattice-hydrogen species located in the interface are coupled with H<sub>ad</sub> atoms on metallic Ir surfaces via thermodynamically favorable Volmer-Tafel steps, and thereby a fast kinetics. Elaborated Ir-H<sub>x</sub>WO<sub>3</sub> demonstrates acid-like activity with a low overpotential of 20 mV at 10 mA cm<sup>-2</sup> and low Tafel slope of 28 mV dec<sup>-1</sup>, which are even comparable to those in acidic environment. The concept exemplified in this work offer the possibilities for tailoring local reaction microenvironment to regulate catalytic activity and pathway.

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