Journal
SMALL
Volume 16, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202000797
Keywords
hierarchical nanostructures; oxygenated cobalt molybdenum selenide; trifunctional catalysts; water splitting; zinc-air batteries
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Funding
- Basic Science Research Program through National Research Foundation (NRF) - Ministry of Science and ICT of the Republic of Korea [2017R1A2B3004917]
- Regional Leading Research Center Program through National Research Foundation (NRF) - Ministry of Science and ICT of the Republic of Korea [2019R1A5A8080326]
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The development of hierarchical nanostructures with highly active and durable multifunctional catalysts has a new significance in the context of new energy technologies of water splitting and metal-air batteries. Herein, a strategy is demonstrated to construct a 3D hierarchical oxygenated cobalt molybdenum selenide (O-Co1-xMoxSe2) series with attractive nanoarchitectures, which are fabricated by a simple and cost-effective hydrothermal process followed by an exclusive ion-exchange process. Owing to its highly electroactive sites with numerous nanoporous networks and plentiful oxygen vacancies, the optimal O-Co0.5Mo0.5Se2 could catalyze the hydrogen evolution reaction and oxygen evolution reaction effectively with a low overpotential of approximate to 102 and 189 mV, at a current density of 10 mA cm(-2), respectively, and exceptional durability. Most importantly, the O-Co0.5Mo0.5Se2||O-Co0.5Mo0.5Se2 water splitting device only entails a voltage of approximate to 1.53 V at a current density of 10 mA cm(-2), which is much better than benchmark Pt/C||RuO2 (approximate to 1.56 V). Furthermore, O-Co0.5Mo0.5Se2 air cathode-based zinc-air batteries exhibit an excellent power density of 120.28 mW cm(-2) and exceptional cycling stability for 60 h, superior to those of state-of-art Pt/C+RuO2 pair-based zinc-air batteries. The present study provides a strategy to design hierarchical 3D oxygenated bimetallic selenide-based multifunctional catalysts for energy conversion and storage systems.
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