1D Nanowire Heterojunction Electrocatalysts of MnCo2O4/GDY for Efficient Overall Water Splitting

Abstract Rational design and synthesis of non‐precious metal‐based electrocatalysts for efficient overall water splitting (OWS) in an integrated electrolyzer are of great significance for the development of hydrogen energy. To this end, nanowire‐structured heterogenous MnCo 2 O 4 /graphdiyne arrays are synthesized on the surface of 3D carbon cloth (NW‐MnCo 2 O 4 /GDY) by using in situ assembly and coupling strategy. Experiments demonstrated that the special core/shell‐nanowire structure and synergistic interaction between the MnCo 2 O 4 and GDY can greatly improve the electric conductivity, facilitate the mass/ion transport and gas emissions, expose more active sites, and thus lead to the enhancement of the catalytic activity and long‐term stability of the electrocatalysts for OWS. For example, the alkaline water electrolyzer assembled by NW‐MnCo 2 O 4 /GDY shows high‐performance with only 1.47 and 1.60 V required to reach a current density of 10 and 100 mA cm −2 , respectively, which is even better than that of previously reported electrocatalysts.