Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 2, Pages 757-771Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.11.021
Keywords
Hybrid technique; Magnetron sputtering; Hydrogen evolution reaction; Acidic electrolyte; Electrochemical impedance spectroscopy (EIS)
Categories
Funding
- STS regional key project of Chinese Academy of Sciences
- Science and Technology major projects of Inner Mongolia Autonomous Region
- Chinese Academy of Science (CAS)
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Developing low-cost, stable, and robust electrocatalysts is significant for high effective hydrogen evolution reaction (HER). In this work, a coating system with Cu2O/NiMoCu on stainless steel (SS) is employed as a highly active and stable catalyst for HER in acidic solutions. Electrochemical measurements for as-designed system on SS show a low onset overpotential, small Tafel slope of similar to 32 mV/decade and long-term durability over 7 days of HER operation. To further inspections of electrocatalytic behavior of as-prepared system in HER, the EIS measurements are performed at several overpotentials and temperatures. It is found that high hydrogen evolution activity and stability of Cu2O/NiMoCu hybrid is likely due to special morphology of Cu2O which result in large number of active sites for hydrogen adsorption, and a synergetic effect giving electronic structure suitable for the HER. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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