Reagent-adaptive active site switching on the IrOx/Ni(OH)2 catalyst

Literature Information

Publication Date 2023-11-29
DOI 10.1039/D3EE02714G
Impact Factor 38.532
Authors

Qian Zheng, Yuandong Yan, Jiaying Zhong


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Abstract

A significant challenge is to develop smart catalysts that can adapt in real time to complex reaction environments. Here, we report a bifunctional catalyst, IrOx/Ni(OH)2 assembly, that can switch between the urea oxidation reaction (UOR) and the oxygen evolution reaction (OER) depending on the reagent coverage on the catalyst. This switch is achieved by altering the electron transfer path in the Ir–O–Ni configuration. At a critical concentration of urea, the electron transfer shifts from the Ir site to the Ni site, resulting in the switch from the OER to the UOR. This reagent-adaptive electron transfer path switching is facilitated by local charge redistribution with increasing reagent coverage. The catalyst exhibits a low onset potential of 1.42 V vs. reversible hydrogen electrode (RHE) for the OER and 1.32 V vs. RHE for the UOR, and 200 hours of stability at 10 mA cm−2 for both the OER and UOR. This reagent-adaptive active center switching makes the catalyst useful for hydrogen production coupled with environmental purification, providing a promising approach for efficient and adaptable catalysis.

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Source Journal

Energy & Environmental Science

Energy & Environmental Science
CiteScore: 32.34
Self-citation Rate: 3.4%
Articles per Year: 481

Energy & Environmental Science is an international journal dedicated to publishing exceptionally important and high quality, agenda-setting research tackling the key global and societal challenges of ensuring the provision of energy and protecting our environment for the future. The scope is intentionally broad and the journal recognises the complexity of issues and challenges relating to energy conversion and storage, alternative fuel technologies and environmental science. For work to be published it must be linked to the energy-environment nexus and be of significant general interest to our community-spanning readership. All scales of studies and analysis, from impactful fundamental advances, to interdisciplinary research across the (bio)chemical, (bio/geo)physical sciences and chemical engineering disciplines are welcomed. Topics include, but are not limited to, the following: Solar energy conversion and photovoltaics Solar fuels and artificial photosynthesis Fuel cells Hydrogen storage and (bio) hydrogen production Materials for energy systems Capture, storage and fate of CO2, including chemicals and fuels from CO2 Catalysis for a variety of feedstocks (for example, oil, gas, coal, biomass and synthesis gas) Biofuels and biorefineries Materials in extreme environments Environmental impacts of energy technologies Global atmospheric chemistry and climate change as related to energy systems Water-energy nexus Energy systems and networks Globally applicable principles of energy policy and techno-economics

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