Journal
COORDINATION CHEMISTRY REVIEWS
Volume 427, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2020.213552
Keywords
Transition metal catalyst; Anion doping; Heteroatom; Water-splitting hydrogen evolution; Oxygen evolution; Electronic structure tuning
Categories
Funding
- National Research Foundation (NRF) of Korea [2012R1A3A2026417]
- Creative Materials Discovery Program - Ministry of Science and ICT [NRF-2018M3D1A1058793]
- Technology Innovation Program - Alchemist Project - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20012315]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20012315] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This review discusses the utilization of anion regulation to design multi-anion transition metal electrocatalysts for enhancing electrochemical performance in water splitting reactions. The rationale behind tuning the properties of electrocatalysts through anion regulation is described using both theoretical and experimental approaches. Challenges and steps towards advancing research in affordable carbon-free hydrogen generation are also discussed.
The storage of intermittent energies, such as wind and solar energies, in the form of hydrogen gas through electrochemical water splitting, is a fascinating strategy. Transition metal composites have emerged as exceptional electrocatalysts for water splitting; however, their practical implementation is hindered by their low conversion efficiency and poor long-term stability. Tuning the electronic structure of transition metal-based electrocatalysts by introducing additional anions, which possess different electronegativities and sizes as compared to the parent anion, is a rational strategy for enhancing the electrochemical performance. In this review, we attempt to review the recent progress on anion-mediated multi-anion transition metal electrocatalysts for the hydrogen evolution reaction, oxygen evolution reaction, and overall water-splitting process. A brief overview of anion-containing transition metal-based electrocatalysts is presented, followed by recent advance surveys in the design of multi-anion-doped transition metal electrocatalysts for high electrochemical performances. The rationale behind the utilization of anion regulation to tune the electrocatalyst properties is described by combined theoretical and experimental approaches. Finally, we discuss the challenges to be addressed and the steps to be taken toward further advancing this research area to achieve affordable carbon-free hydrogen generation in the future. (C) 2020 Elsevier B.V. All rights reserved.
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