Cobalt Hydroxide Spindle Nanosheet Amorphous Electrocatalysts via In‐Situ Fast Reduction Release/Oxidization Mechanistic Method for Efficient Overall Water Electrolysis

Abstract

AbstractWater electrolysis focused with electricity or sunlight is one of the sustainable methods to produce hydrogen; this helps to address the global energy demand whereas sluggish OER and HER kinetic barriers hamper this process. Here, we report an earth abundant Co(OH)2 spindle nanosheet electrocatalyst synthesized via surfactant with boron‐assisted release/oxidize mechanistic process and employed it as a bifunctional electrocatalyst (OER/HER) with small overpotential (258 mV/156 mV), low Tafel slope (78 mV dec−1/71 mV dec−1), higher turnover frequency (0.235 s−1/0.100 s−1) and low charge transfer resistance (4.7 Ω). The higher electrochemical active surface area (45 cm2) of the catalyst exploits the potential electrocatalyst nature with overall cell voltage 1.64 V at 10 mA cm−2.