Construction and optimization of multi-interface nanotube structured phosphorus-doped bimetallic oxide arrays as efficient electrocatalysts for water splitting

Abstract

Interface engineering for the controllable preparation of highly efficient electrocatalysts is still a great challenge in the development of inexhaustible energy supplying systems. Herein, the successful synthesis of P-CoMoO₄/CF nanoarray electrocatalysts with different morphologies through facile hydrothermal synthesis, immersion and annealing strategies is reported. The nanotube array electrode of P-CoMoO₄/CF-1 with abundant interfacial active sites presented exceptional activity for overall water splitting, approaching 100 mA cm⁻² at a low voltage of 1.6 V. In addition, the electrodes exhibit good stability in long-term reactions, showing good potential for hydrogen and oxygen production at constant voltage for more than 24 hours. The present work indicates that MOF decoration of arrays with unique surfaces based on interfacial engineering is an advisable strategy to simultaneously improve interfacial reaction dynamics and catalyst activity, paving the way for designing other arrays as versatile electrodes combining the advantages of POMs and MOFs.