[논문]Mixed Transition Metal Oxide with Vacancy-Induced Lattice Distortion for Enhanced Catalytic Activity of Oxygen Evolution Reaction

Lee, Hyeon Jeong; Back, Seoin; Lee, Ji Hoon; Choi, Sun Hee; Jung, Yousung; Choi, Jang Wook

doi:10.1021/acscatal.9b01298

[해외논문] Mixed Transition Metal Oxide with Vacancy-Induced Lattice Distortion for Enhanced Catalytic Activity of Oxygen Evolution Reaction

ACS catalysis, v.9 no.8, 2019년, pp.7099 - 7108

Lee, Hyeon Jeong (School of Chemical and Biological Engineering and Institute of Chemical Process , Seoul National University , 1 Gwanak-ro, Gwanak-gu , Seoul 08826 , Republic of Korea) , Back, Seoin (Graduate School of Energy, Environment, Water, and Sustainability (EEWS) , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu , Daejeon 34141 , Republic of Korea) , Lee, Ji Hoon (Graduate School of Energy, Environment, Water, and Sustainability (EEWS) , Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong-gu , Daejeon 34141 , Republic of Korea) , Choi, Sun Hee (Pohang Accelerator Laboratory (PAL) , Pohang University of Science and Technology (POSTECH) , 80 Jigokro-127-beongil, Nam-gu , Pohang , Gyeongbuk 37673 , Republic of Korea) , Jung, Yousung , Choi, Jang Wook

Abstract ▼ AI-Helper

The oxygen evolution reaction (OER) constitutes the key limiting process in water electrolysis, and various catalysts have recently been introduced to improve OER efficiency. Vacancy engineering in the crystal lattice is particularly promising in catalyst design, as vacancies could perturb the electronic properties of adjacent atoms to make them catalytically active. Noting that one of the well-adopted approaches to induce vacancies in a crystal structure is the mixing of elements with different valence states, herein, we investigate crystalline NiFe-VM-O in comparison with NiO. Vacancies are naturally generated to meet charge neutrality when Ni2+ and Fe3+ are mixed via solid solution. As a result of vacancy formation, NiFe-VM-O exhibits markedly enhanced catalytic performance for the OER. A combined in situ X-ray absorption fine structure and density functional theory analysis reveals that transition metal vacancies in NiFe-VM-O distort the adjacent Ni’s electronic structure toward weakening the interaction with the reaction intermediate *O, which is also associated with the enhanced structural flexibility of NiFe-VM-O involving the transition metal vacancies. This study demonstrates the usefulness of the “vacancy-local structure-electronic property” relationship as a tool in manipulating the catalytic properties of OER electrocatalysts.[FIG OMISSION]

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