Vanadium-Doped Ni 3 S 2 : Morphological Evolution for Enhanced Industrial-Scale Water and Urea Electrolysis.

Autor: Sharma PJ; Department of Physical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Anand, Gujarat, 388421, India., Joshi KK; Department of Physical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Anand, Gujarat, 388421, India., Siraj S; Department of Electrical and Electronics Engineering, BITS Pilani Hyderabad, Secunderabad, 500078, India., Sahatiya P; Department of Electrical and Electronics Engineering, BITS Pilani Hyderabad, Secunderabad, 500078, India., Sumesh CK; Department of Physical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Anand, Gujarat, 388421, India., Pataniya PM; Department of Physical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Anand, Gujarat, 388421, India.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2024 Aug 31, pp. e202401371. Date of Electronic Publication: 2024 Aug 31.
DOI: 10.1002/cssc.202401371
Abstrakt: The development of an earth abundant, cost-effective, facile and multifunctional 3D-porous catalytic network for green hydrogen production is a tremendous challenge. Herein, we report the V-Ni 3 S 2 self-supported catalytic network with optimized morphology grown directly on nickel foam (NF) by the one-step hydrothermal technique for water and urea electrolysis at industrial scale hydrogen generation. The morphology of Ni 3 S 2 was modulated by doping of different concentrations of vanadium from granules to cross-linked wires to hierarchal nanosheets arrays, which is beneficial in electrochemical charge and mass transport, and generates more exposed active sites. The V-Ni 3 S 2 catalyst requires the overpotential of 147 mV for hydrogen evolution reaction (HER). The OER and UOR half-cell reaction on V-Ni 3 S 2 catalyst requires potential 1.57 V and 1.39 V (vs RHE), respectively to generate current 100 mA/cm 2 . The water electrolysis cell developed by V-Ni 3 S 2 as both anode and cathode generates 100 mA/cm 2 at cell voltage of 1.88 V in laboratory condition (1 M KOH, 25 °C) and 1.61 V at industrial condition (5 M KOH, 80 °C) and also shows considerable stability for 82 hr at current 300 mA/cm 2 . The urea electrolysis cell with 1 M KOH and 0.33 M urea generates 100 mA/cm 2 at a cell voltage of 1.73 V, which is 150 mV less than that required for water electrolysis and demonstrate stability for 85 hr at a current of 100 mA/cm 2 . The results provide an innovative plan for the considerate synthesis and design of bifunctional catalysts for energy storage and water splitting.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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