1. Constructing a NiMnS electrode with a Mn-rich surface for hydrogen production in anion exchange membrane water electrolyzers.
- Author
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Guo, Wenwu, Kim, Hyunki, Hong, Seokjin, Kim, Soo Young, and Ahn, Sang Hyun
- Subjects
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ION-permeable membranes , *HYDROGEN evolution reactions , *HYDROGEN production , *ELECTROLYTIC cells , *STANDARD hydrogen electrode , *ELECTRODES - Abstract
Efficient alkaline hydrogen evolution electrodes must be used for hydrogen production in anion exchange membrane water electrolyzers (AEMWEs). Therefore, we fabricated a NiMnS catalyst with a Mn-rich surface, which was self-supported on Ti paper through one-step electrodeposition. Mn doping endowed the catalyst with a unique hollow morphology and lattice-distorted structure. Consequently, the NiMnS/Ti electrode exhibited a large number of exposed electrochemical surfaces and effective active sites and a high hydrogen evolution reaction (HER) activity. Specifically, in half-cell measurements, the NiMnS/Ti electrode exhibited an overpotential of 65 mV at 10 mA cm−2, which was lower than that of NiS/Ti (102 mV) and indicated its superior HER activity. When the proposed cathode was applied in an AEMWE single cell, the device achieved a high current density of up to 0.9 A cm−2 at a cell potential of 2.0 V. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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