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 cm²) of the catalyst exploits the potential electrocatalyst nature with overall cell voltage 1.64 V at 10 mA cm⁻².