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Hierarchical CoWO 4 /Ni x Fe y S microspheres bearing crystalline-amorphous interface as a multifunctional platform for outperformed water splitting and sensitive hydrazine sensing.
Journal of Colloid and Interface Science 2024 March 10
Highly efficient and multifunctional electrocatalysts are of high value in energy transformation and electrochemical sensing. Herein, hierarchically architectured cobalt tungstate/nickel iron sulfide (CoWO4 /Nix Fey S) microspheres with a crystalline-amorphous interface have been prepared on bimetallic substrate of nickel-iron foam (NIF) by a two-step hydrothermal method. Electrochemical characterization shows that CoWO4 /Nix Fey S microspheres can boost the electrocatalytic activity effectively through the synergistic effect on the crystalline-amorphous interface. When the CoWO4 /Nix Fey S is applied as the electrocatalysts for oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), the overpotentials at a high current density of 500 mA cm-2 are only 322.8 mV and 306.5 mV, respectively. The overall water splitting device composed of CoWO4 /Nix Fey S/NIF couple only needs a cell voltage of 1.80 V to reach a current density of 100 mA cm-2 , and 2.19 V to reach 500 mA cm-2 . The CoWO4 /Nix Fey S/NIF can be also utilized as an effective electrochemical platform for the sensing of toxic hydrazine in a wide range from 50 μM to 17.3 mM, with a detection limit of 46.4 μM. All these results display that the CoWO4 /Nix Fey S/NIF can be a high-performance multifunctional material for energy transformation and environmental pollutant monitoring.
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