Sharma Pooja J, Joshi Kinjal K, Siraj Sohel, Sahatiya Parikshit, Sumesh C K, Pataniya Pratik M
Department of Physical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, CHARUSAT, Anand, Gujarat, 388421, India.
Department of Electrical and Electronics Engineering, BITS Pilani Hyderabad, Secunderabad, 500078, India.
ChemSusChem. 2025 Feb 1;18(3):e202401371. doi: 10.1002/cssc.202401371. Epub 2024 Oct 28.
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-NiS 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 NiS 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-NiS catalyst requires the overpotential of 147 mV for hydrogen evolution reaction (HER). The OER and UOR half-cell reaction on V-NiS catalyst requires potential 1.57 V and 1.39 V (vs RHE), respectively to generate current 100 mA/cm. The water electrolysis cell developed by V-NiS as both anode and cathode generates 100 mA/cm 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. The urea electrolysis cell with 1 M KOH and 0.33 M urea generates 100 mA/cm 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. The results provide an innovative plan for the considerate synthesis and design of bifunctional catalysts for energy storage and water splitting.
开发一种用于绿色制氢的、储量丰富、成本效益高、制备简便且多功能的三维多孔催化网络是一项巨大挑战。在此，我们报道了一种通过一步水热法在泡沫镍（NF）上直接生长的具有优化形貌的V-NiS自支撑催化网络，用于工业规模制氢的水电解和尿素电解。通过掺杂不同浓度的钒，将NiS的形貌从颗粒调制为交联线再到分级纳米片阵列，这有利于电化学电荷和质量传输，并产生更多暴露的活性位点。V-NiS催化剂在析氢反应（HER）中需要147 mV的过电位。V-NiS催化剂上的析氧反应（OER）和尿素氧化反应（UOR）半电池反应分别需要1.57 V和1.39 V（相对于可逆氢电极，RHE）的电位才能产生100 mA/cm²的电流。由V-NiS作为阳极和阴极构建的水电解池在实验室条件（1 M KOH，25°C）下，在1.88 V的电池电压下可产生100 mA/cm²的电流，在工业条件（5 M KOH，80°C）下为1.61 V，并且在300 mA/cm²的电流下还表现出长达82小时的可观稳定性。含有1 M KOH和0.33 M尿素的尿素电解池在1.73 V的电池电压下可产生100 mA/cm²的电流，这比水电解所需的电压低150 mV，并在100 mA/cm²的电流下表现出85小时的稳定性。这些结果为储能和水分解双功能催化剂的合理合成和设计提供了创新方案。
