Vertical-crystalline Fe-doped beta-Ni oxyhydroxides for highly active and stable evolution reaction
- Authors
- Kim, Byeongyoon; Kabiraz, Mrinal Kanti; Lee, Jaewan; Choi, Changhyeok; Baik, Hionsuck; Jung, Yousung; Oh, Hyung-Suk; Choi, Sang-Il; Lee, Kwangyeol
- Issue Date
- 3-11월-2021
- Publisher
- ELSEVIER
- Keywords
- AEMWE; DFT study for Fe/NiOOH; MAP4: Demonstrate; active sites; crystalline Fe/NiOOH; electrocatalysis; facet control; heteroepitaxy; in-situ/operando XAS; oxygen evolution reaction
- Citation
- MATTER, v.4, no.11, pp.3585 - 3604
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATTER
- Volume
- 4
- Number
- 11
- Start Page
- 3585
- End Page
- 3604
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135770
- DOI
- 10.1016/j.matt.2021.09.003
- ISSN
- 2590-2393
- Abstract
- The layered transition metal oxyhydroxides have received increasing interest owing to the efficient energy conversion performance and material stability during the oxygen evolution reaction (OER). In particular, Fe-doped NiOOH has shown record-high OER performance in alkaline media among various catalysts. Theoretically, undercoordinated facets including Ni4+, exposed at the edges of NiOOH, were predicted to perform highly active OER. Therefore, here we suggest a rational catalyst design, a vertical-crystalline beta-Fe/NiOOH layer built on faceted Fe/Ni nanocrystals, which exposes Ni4+ sites and could improve the OER performance dramatically. Electrochemical OER tests recorded the overpotential of 210 mV at a current density of 10 mA cm(-2) GEO and stable operation for 5 days. In situ/operando and density functional theory studies revealed that the Ni valence cycle between +2 and +4 assisted by Fe dopant is the key engine that greatly accelerates OER kinetics and that the vertical-crystalline beta-Fe/NiOOH layers on Ni octahedra are stable under harsh OER conditions.
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