Yun Woo Hyun, Das Gautam, Kim Bohyeon, Park Bang Ju, Yoon Hyon Hee, Yoon Young Soo
Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi-do, 461-701, Republic of Korea.
Department of Polymer Science and Engineering, Kyungpook National University, Sangyeok-dong, Buk-gu, Daegu, Korea.
Sci Rep. 2021 Nov 9;11(1):22003. doi: 10.1038/s41598-021-01383-3.
A free-standing catalyst electrode for the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) in a urea electrolysis cell was synthesized by electroplating a Ni-Fe alloy onto carbon felt, followed by phosphidation (P-NiFe@CF). The prepared P-NiFe@CF catalyst consisted of NiP, NiP, and FeP with 3D flower-like P-NiFe architecture on CF. P-NiFe@CF exhibited excellent electrocatalytic activity for the UOR (demanding only 1.39 V (vs. RHE) to achieve 200 mA cm), and for the HER with a low overpotential of 0.023 V (vs. RHE) at 10 mA cm, indicating its feasibility as a bifunctional catalyst electrode for urea electrolysis. A urea electrolysis cell with P-NiFe@CF as both the free-standing anode and cathode generated a current density of 10 mA cm at a cell potential of 1.37 V (vs. RHE), which is considerably lower than that of water electrolysis, and also lower than previously reported values. The results indicate that the P-NiFe@CF catalyst electrodes can be used as free-standing bifunctional electrodes for urea electrolyzers.
通过在碳毡上电沉积镍铁合金，然后进行磷化处理（P-NiFe@CF），合成了一种用于尿素电解槽中尿素氧化反应（UOR）和析氢反应（HER）的独立式催化剂电极。制备的P-NiFe@CF催化剂由NiP、NiP和FeP组成，在CF上具有三维花状P-NiFe结构。P-NiFe@CF对UOR表现出优异的电催化活性（仅需1.39 V（相对于RHE）即可达到200 mA cm），对HER在10 mA cm时具有0.023 V（相对于RHE）的低过电位，表明其作为尿素电解双功能催化剂电极的可行性。以P-NiFe@CF作为独立阳极和阴极的尿素电解槽在1.37 V（相对于RHE）的电池电位下产生了10 mA cm的电流密度，这远低于水电解的电流密度，也低于先前报道的值。结果表明，P-NiFe@CF催化剂电极可作为尿素电解槽的独立双功能电极。
