One-step synthesis of interwoven MoS2-CoNi2S4 heterostructures as high-activity water oxidation electrocatalysts

Developing low-cost and highly efficient catalysts for oxygen evolution reaction (OER) is extremely desirable in water splitting. Herein, we report a controllable synthesis strategy to fabricate high-performance 3D ternary CoMo-Ni metal-sulfide heterostructures only by one-step hydrothermal way. It is indicated that a series of CoxMoyS/NF consisting of MoS2 and CoNi2S4 active sites by optimizing the molar ratio of Co and Mo demonstrates various morphologies, capacitances and electrochemical performances. The obtained Co3Mo2-S/NF heterostructures exhibit superior OER performances in alkaline medium with the overpotential of only 106 mV to afford 20 mA cm(-2). Moreover, the catalyst presents the Tafel slope of 53.1 mV dec(-1) and good stability. Such excellent activities can be attributed to the distinctive 3D nanoneedles array with large electrochemical active areas, interwoven architecture with defect-rich features, high conductivity and the synergistic effect between MoS2 and CoNi2S4 species. This work demonstrates a facile and controllable pathway to synthesize multiple transitional metal-based chalcogenides as highly efficient OER catalysts.

Automated summary

A controllable synthesis strategy for high-performance 3D ternary CoMo-Ni metal-sulfide heterostructures was reported in this study, demonstrating superior oxygen evolution reaction (OER) performances in alkaline medium.