Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 42, Pages 22885-22891Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202108563
Keywords
CoNi2S4; electrolysis; hydrogen; phosphorization; urea
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Funding
- Ministry of Education of Singapore through Academic Research Fund (AcRF) Tier-1 [RG116/18]
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The study synthesized porous phosphorized CoNi2S4 yolk-shell spheres (P-CoNi2S4 YSSs) with excellent activity and durability for hydrogen generation and urea oxidation reactions. This work promotes the application of sulfides in electrochemical hydrogen production and provides a feasible approach for urea-rich wastewater treatment.
Exploring earth-abundant electrocatalysts with excellent activity, robust stability, and multiple functions is crucial for electrolytic hydrogen generation. Porous phosphorized CoNi2S4 yolk-shell spheres (P-CoNi2S4 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-CoNi2S4 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-CoNi2S4 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.
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