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)
摘要
Highly efficient and multifunctional electrocatalysts are of high value in energy transformation and electrochemical sensing. Herein, hierarchically architectured cobalt tungstate/nickel iron sulfide (CoWO 4 /Ni x Fe y 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 CoWO 4 /Ni x Fe y S microspheres can boost the electrocatalytic activity effectively through the synergistic effect on the crystallineamorphous interface. When the CoWO 4 /Ni x Fe y 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 CoWO 4 /Ni x Fe y 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 CoWO 4 /Ni x Fe y S/NIF can be also utilized as an effective electrochemical platform for the sensing of toxic hydrazine in a wide range from 50 mu M to 17.3 mM, with a detection limit of 46.4 mu M. All these results display that the CoWO 4 /Ni x Fe y S/NIF can be a high-performance multifunctional material for energy transformation and environmental pollutant monitoring.
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关键词
Cobalt tungstate,Nickel iron sulfide,Crystalline-amorphous interface,Water splitting,Electrochemical sensor,Hydrazine
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