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Facile in-situ growth of Ni2P/Fe2P nanohybrids on Ni foam for highly efficient urea electrolysis

Yan, Lei, Sun, Yulin, Hu, Enlai, Ning, Jiqiang, Zhong, Yijun, Zhang, Ziyang, Hu, Yong
Journal of colloid and interface science 2019 v.541 pp. 279-286
catalysts, electric potential, electrodes, electrolysis, energy conservation, ferric chloride, foams, hydrogen production, iron, nanohybrids, nickel, thermodynamics, urea
Urea electrolysis is regarded as an alternative energy-saving hydrogen production technique to replace the conventional water splitting method due to the predicted lower thermodynamic potential. Herein, we demonstrate a robust and mass-produced strategy to in-situ grow Ni2P/Fe2P nanohybrids on Ni foam (Ni2P/Fe2P/NF) as an advanced electrode for overall urea electrolysis via a 30 s manual shaking reaction of FeCl3·6H2O, K3[Fe(CN)6] and pre-treated NF, followed by a facile phosphorization treatment. The as-prepared Ni2P/Fe2P/NF electrode exhibits high activity for the HER at 115 mV and UOR at 1.36 V with the current density of 10 mA cm−2, and only a cell voltage of 1.47 V is required to deliver the current density of 10 mA cm−2. This work reveals a promising industrializable pathway to develop non-noble materials as bifunctional catalysts.