Interface Engineering\nof a Hollow Ag Modified Co–Phytic\nAcid Nanoprism toward Efficient Oxygen Evolution Reaction

It is urgent to engineer an advanced electrocatalyst\ntoward the\noxygen evolution reaction for water electrolysis, and interface engineering\nis an effective method to boost the catalytic activity. Here we report\nAg modified Co–phytic acid (Co-PA-Ag) with a hollow nanoprism\nstructure for the OER. Co-PA is prepared by etching a Co precursor\nwith phytic acid, and a spontaneous redox reaction is used to load\nAg nanoparticles. The close contact between Co-PA and Ag modifies\nthe electronic structure of Co-PA-Ag, which greatly improves its catalytic\nactivity. The Co-PA-Ag only needs an overpotential of 270 mV at 10\nmA cm<sup>–2</sup>, as well as long-term durability for 35\nh. In addition, an electrolyzer featuring a Co-PA-Ag anode and Pt/C\ncathode exhibits rapid water splitting capacity with 100% Faraday\nefficiency, demonstrating its practical application.