Ni-Fe phosphide deposited carbon felt as free-standing bifunctional catalyst electrode for urea electrolysis.

Sci Rep

Department of Materials Science and Engineering, Gachon University, Seongnam, Gyeonggi-do, 461-701, Republic of Korea.

Published: November 2021

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.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8578333PMC
http://dx.doi.org/10.1038/s41598-021-01383-3DOI Listing

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