Understanding the Role of Oxygen Vacancy Defects in Iridium‐Leveraged MOFs‐Type Catalyst
Source abstract
Abstract
Abstract Engineering oxygen vacancies (Vo) in metal–organic framework (MOF) is considered as an effective strategy to improve the hydrazine oxidation reaction (HzOR) performance. However, the role of Vo and the metal sites for HzOR is still not fully understood. Herein, this study reports the synthesis of a well‐defined bimetallic VO‐rich benzene dicarboxylic acid‐based MOF (NiIr0.03‐BDC) as a model to clarify the intricate catalytic mechanism. Operando characterizations demonstrate that the Vo‐rich environment favors the adsorption of OH− on the catalyst surface during the HzOR process, leading to the formation of Ni(OH)x active species. Theoretical calculations reveal that the introduced Ir at metal nodes not only boosts the HzOR activity of the Ni sites by tuning their electronic structure but also serves as the active sites for hydrogen evolution. As a result, the two‐electrode electrolyzer with NiIr0.03‐BDC || NiIr0.03‐BDC configuration achieved 10 mA cm−2 at an ultralow cell voltage of 0.046 V. This work provides new insights into oxygen vacancy defect engineering of MOFs and paves a solid step for low‐energy consumption hydrogen production.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Advancements in Solid Oxide Fuel Cells · Electrocatalysts for Energy Conversion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Integrated Circuits Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 P. R. China
Center for Reliability Science and Technologies Center for Sustainability and Energy Tecnhologies Chang Gung University Taoyuan 33302 Taiwan
Energy Water and Environment Lab College of Humanities and Sciences Prince Sultan University Riyadh 11586 Saudi Arabia
National Center for International Research on Photoelectric and Energy Materials Yunnan Key Laboratory for Micro/Nano Materials & Technology School of Materials and Energy Yunnan University Kunming 650091 P. R. China
State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 P. R. China
Department of Chemistry City University of Hong Kong Kowloon Hong Kong 999077 P. R. China
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China · Chang Gung University
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