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

Abstract Water 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 cm 2 ) of the catalyst exploits the potential electrocatalyst nature with overall cell voltage 1.64 V at 10 mA cm −2 .