Journal
JOURNAL OF POWER SOURCES
Volume 527, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231151
Keywords
Cobalt-based metal-organic framework; Cadmium sulfide; Oxygen evolution reaction; Anion exchange membrane; Water electrolysis
Funding
- National Research Foundation of Korea Grant - Korean Government [NRF-2021R1I1A3059469]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [20213030040590]
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Precious metal-free electrocatalysts are crucial for the production of green hydrogen using low-cost electrolysis technology. This study proposes a low-cost electrocatalyst composed of cadmium sulfide nanoparticles decorated in a Cobalt-based metal-organic framework, showing excellent electrochemical reactivity and stability, making it a promising electrolyzer for commercial power market.
Precious metal-free electrocatalysts are essential for green hydrogen using low-cost electrolysis technology for future power supply systems. In this regard, anion-exchange membrane (AEM) electrolysis is the technology of best choice due to its compactness and high efficiency. Here, we proposed a low cost electrocatalyst composed of cadmium sulfide (CdS) nanoparticles decorated in a Cobalt-based metal-organic framework (CdS/ZIF-67), synthesized using a simple coprecipitation method. Compared with pristine Cobalt-based metal-organic framework (ZIF-67), 5 wt%CdS/ZIF-67 has excellent electrochemical oxygen evolution reaction activity, low overpotential (294 mV), low Tafel-slope (100 mV dec(-1)), higher mass activity (25.8 mA mg(-1)), and better stability. The AEM electrolyzer with the 5 wt%CdS/ZIF-67 anode can attain a potential of 1.85 V at a current-density of 1 A cm(-2), which is lower than that of bare Cobalt-based metal-organic framework electrolyzers. Thus, these catalysts are not only very active but also scalable, making them a promising electrolyzer for application in commercial power market.
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