Highly Active Surface Structure in Nanosized Spinel Cobalt-Based Oxides for Electrocatalytic Water Splitting

doi:10.1021/acs.jpcc.8b00407

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Highly Active Surface Structure in Nanosized Spinel Cobalt-Based Oxides for Electrocatalytic Water Splitting
	Zhou, J ; Li, J ; Zhang, LJ ; Song, SZ ; Wang, Y ; Lin, X ; Gu, SQ ; Wu, X ; Weng, TC ; Wang, JQ
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2018
卷号	122 期号:26 页码:14447-14458
关键词	OXYGEN-EVOLVING CATALYSTS X-RAY-ABSORPTION OCTAHEDRAL SYMMETRY STATE TRANSITION NANOWIRE ARRAYS CRYSTAL PLANE FUEL-CELLS EVOLUTION OXIDATION PEROVSKITE
ISSN号	1932-7447
DOI	10.1021/acs.jpcc.8b00407
文献子类	期刊论文
英文摘要	Spinel cobalt-based oxides are a promising family of materials for water splitting to replace currently used noble-metal catalysts. Identifying the highly active facet and the corresponding coordinated structure of surface redox centers is pivotal for the rational design of low-cost and efficient nanosized catalysts. Using high-resolution transmission electron microscopy and advanced X-ray techniques, as well as ab initio modeling, we found that the activity of Co3+ ions exhibits the surface dependence owing to the variability of its electronic configurations. Our calculation shows that the Co3+ site in {100} facet of nanosized Li2Co2O4 exhibits an impressive intrinsic activity with low overpotential, far lower than that of the {110} and {111} facets. The unique, well-defined CoO5 square-pyramidal structure in this nonpolar surface stabilizes the unusual intermediate-spin states of the Co3+ ion. Specially, we unraveled that oxygen ion anticipates the redox process via the strong hybridization Co 3d-O 2p state, which produces a 3d(z)(21.1) filling orbit. Finally, a spin-correlated energy diagram as a function of Co-O distance was devised, showing that the covalency of Co-O significantly affects the spin state of Co3+ ions. We suggest that the nonpolar surface that contains CoO5 units in the edge-sharing systems with the short Co-O bond distance is a potential candidate for alkaline water electrolysis.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/30969]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China
推荐引用方式 GB/T 7714	Zhou, J,Li, J,Zhang, LJ,et al. Highly Active Surface Structure in Nanosized Spinel Cobalt-Based Oxides for Electrocatalytic Water Splitting[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2018,122(26):14447-14458.
APA	Zhou, J.,Li, J.,Zhang, LJ.,Song, SZ.,Wang, Y.,...&Zhang, S.(2018).Highly Active Surface Structure in Nanosized Spinel Cobalt-Based Oxides for Electrocatalytic Water Splitting.JOURNAL OF PHYSICAL CHEMISTRY C,122(26),14447-14458.
MLA	Zhou, J,et al."Highly Active Surface Structure in Nanosized Spinel Cobalt-Based Oxides for Electrocatalytic Water Splitting".JOURNAL OF PHYSICAL CHEMISTRY C 122.26(2018):14447-14458.