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Low-Cost Ni<sub>2</sub>P/Ni<sub>0.96</sub>S Heterostructured Bifunctional Electrocatalyst toward Highly Efficient Overall Urea-Water Electrolysis
119
Citations
47
References
2019
Year
Water splitting is a sustainable approach for production of hydrogen to fuel some clean energy technologies. This process, unfortunately, has been significantly impeded by the puzzles in either the efficient but economically unaffordable noble-metal-based catalysts or the low-cost but kinetically sluggish abundant-element-based catalysts. Particularly, the discovery of efficient bifunctional catalysts that can simultaneously trigger the reactions of both anode and cathode for overall water splitting still remains as a grand challenge. Herein, a novel low-cost bifunctional Ni<sub>2</sub>P/Ni<sub>0.96</sub>S heterostructured electrocatalyst, which is active for both the urea oxidation reaction at the anode and the hydrogen evolution reaction at the cathode, is innovated for high-efficiency overall splitting of urea-rich wastewater. A systematic configuration of a Ni foam (NF)-supported Ni<sub>2</sub>P/Ni<sub>0.96</sub>S catalyst electrode exhibits superior catalytic activity and stability. The Ni<sub>2</sub>P/Ni<sub>0.96</sub>S/NF||Ni<sub>2</sub>P/Ni<sub>0.96</sub>S/NF cell needs only 1.453 V to reach a current density of 100 mA/cm<sup>2</sup> in basic urea-containing water, while it is 1.693 V for a reference noble-based Pt/C/NF||IrO<sub>2</sub>/NF electrolysis cell. This work therefore not only contributes to develop a low-cost, high-efficiency, bifunctional electrocatalyst but also provides a practically feasible approach for urea-rich wastewater treatment.
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