Sulfur‐Induced Interface Engineering of Hybrid NiCo2O4@NiMo2S4 Structure for Overall Water Splitting and Flexible Hybrid Energy Storage

By Depeng Zhao, M. Dai, Hengqi Liu, Kunfeng Chen, Xiao-fei Zhu, D. Xue, Xiang Wu, Jinping Liu. Advanced Materials Interfaces, 2019

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To rationally design hybrid structures with unique surface/interface features is very significant due to their multi‐functionalization in energy storage and conversion systems. Generally, single metal oxide as electrode material is still unsatisfactory for its slow electron transportation and inevitable structural collapse. To address these issues, sulfur element‐induced interface‐tailoring hybrid NiCo2O4@NiMo2S4 nanosheet structures with high electrochemical activity are reported through a simple vulcanization process of NiCo2O4@NiMoO4 nanosheets. The hybrid NiCo2O4@NiMo2S4 structure presents excellent hydrogen evolution reaction performance with the overpotential of 159 mV at 10 mA cm−2 and low Tafel slope of 53.1 mV dec−1, and overall water splitting abilities with low cell voltage of 1.63 V at 50 mA cm−2 and stability for 13 h. As supercapacitor electrode materials, the hybrid structures exhibit a specific capacitance 519 C g−1 at 1 A g−1, which is higher than that of hybrid NiCo2O4@NiMoO4 nanosheets (420 C g−1). The asymmetric device delivers an energy density of 30.73 Wh kg−1 at a power density of 374.9 W kg−1.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/4e6f3d0df0ceea1caf7630affe55fed502b2ecdc