Special NaBH 4 hydrolysis achieving multiple-surface-modifications promotes the high-throughput water oxidation of CoN nanowire arrays.

Designing an excellent OER catalyst in an alkaline environment is severe yet essential for industrial H 2 application under the electrochemical technique. This study has achieved multiple modifications on CoN nanowires, the classic OER catalyst, via a facile room-temperature NaBH 4 spontaneous hydrolysis. This facile process simultaneously generates oxygen vacancies and robust BN species. It wraps hydrophilic BO x motifs on the OER response CoN nanowires, producing OER active Co-N-B species, increasing active numbers and guaranteeing structural stability. It suggests that a low NaBH 4 concentration (0.1 mol L -1 ) treatment endows CoN NWAs /CC with excellent OER performance and robust structure, which can drive a current density of 50 mA cm -2 with only 325 mV overpotentials with more than 24 hours' durability. Even, the catalyst can drive 1000 mA cm -2 around 480 mV overpotential. This study allows a novel strategy for designing high-performance OER catalysts.