Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/156938
Title: Phosphorized CoNi₂S₄ yolk-shell spheres for highly efficient hydrogen production via water and urea electrolysis
Authors: Lu, Xue Feng
Zhang, Song Lin
Sim, Wei Lok
Gao, Shuyan
Lou, David Xiong Wen
Keywords: Engineering::Chemical engineering
Issue Date: 2021
Source: Lu, X. F., Zhang, S. L., Sim, W. L., Gao, S. & Lou, D. X. W. (2021). Phosphorized CoNi₂S₄ yolk-shell spheres for highly efficient hydrogen production via water and urea electrolysis. Angewandte Chemie International Edition, 60(42), 22885-22891. https://dx.doi.org/10.1002/anie.202108563
Project: RG116/18
Journal: Angewandte Chemie International Edition
Abstract: Exploring earth-abundant electrocatalysts with excellent activity, robust stability, and multiple functions is crucial for electrolytic hydrogen generation. Porous phosphorized CoNi2 S4 yolk-shell spheres (P-CoNi2 S4 YSSs) were rationally designed and synthesized by a combined hydrothermal sulfidation and gas-phase phosphorization strategy. Benefiting from the strengthened Ni3+ /Ni2+ couple, enhanced electronic conductivity, and hollow structure, the P-CoNi2 S4 YSSs exhibit excellent activity and durability towards hydrogen/oxygen evolution and urea oxidation reactions in alkaline solution, affording low potentials of -0.135 V, 1.512 V, and 1.306 V (versus reversible hydrogen electrode) at 10 mA cm-2 , respectively. Remarkably, when used as the anode and cathode simultaneously, the P-CoNi2 S4 catalyst merely requires a cell voltage of 1.544 V in water splitting and 1.402 V in urea electrolysis to attain 10 mA cm-2 with excellent durability for 100 h, outperforming most of the reported nickel-based sulfides and even noble-metal-based electrocatalysts. This work promotes the application of sulfides in electrochemical hydrogen production and provides a feasible approach for urea-rich wastewater treatment.
URI: https://hdl.handle.net/10356/156938
ISSN: 1433-7851
DOI: 10.1002/anie.202108563
Rights: This is the peer reviewed version of the following article: Lu, X. F., Zhang, S. L., Sim, W. L., Gao, S. & Lou, D. X. W. (2021). Phosphorized CoNi₂S₄ yolk-shell spheres for highly efficient hydrogen production via water and urea electrolysis. Angewandte Chemie International Edition, 60(42), 22885-22891, which has been published in final form at https://doi.org/10.1002/anie.202108563. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20221018
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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