CoMn Layered Double Hydroxides/Carbon Nanotubes Architectures as High-Performance Electrocatalysts for the Oxygen Evolution Reaction

High-efficiency, earth-abundant oxygen evolution reaction (OER) catalysts are highly desired and required for the half reaction of water splitting. Herein, an integrated system composed of CoMn layered double hydroxides (CoMn-LDH) and carbon nanotubes (CNTs) were configured for the OER. Ultrathin CoMn-LDH nanoplates can grow and assemble in situ on conducting CNT frameworks to form the CoMn-LDH/CNT nanoarchitectures. The CNT frameworks provide conducting channels for fast charge transfer, whereas CoMn-LDH features highly active sites and is capable of catalyzing the OER process. Benefiting from functional integration of the highly active CoMn-LDH nanoplates and the strong coupling effects between ultrathin nanoplates and conducting CNT frameworks, the as-made CoMn-LDH/CNT nanohybrids achieve excellent OER performance with a small overpotential (355 mV at 10 mA cm−2), low Tafel slope (45 mV dec−1), and prominent electrochemical durability.