文献类型：期刊文献

英文题名：In Situ Formation of Cobalt Oxide Nanocubanes as Efficient Oxygen Evolution Catalysts

作者：Hutchings, Gregory S.[1];Zhang, Yan[1];Li, Jian[2];Yonemoto, Bryan T.[1];Zhou, Xinggui[2];Zhu, Kake[2];Jiao, Feng[1]

机构：[1]Univ Delaware, Dept Chem & Biomol Engn, CCST, Newark, DE 19716 USA;[2]E China Univ Sci & Technol, UNILAB, State Key Lab Chem Engn, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：137

期号：12

起止页码：4223

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20151500724041);WOS:【SCI-EXPANDED(收录号:WOS:000352244800038)】；

基金：The authors at University of Delaware would like to thank the financial support from the University of Delaware Research Foundation Strategic Initiatives (UDRF-SI) grant. K.K.Z. is grateful for the financial support from National Natural Science Foundation of China (21006024), Fundamental Research Funds for the Central Universities (WB 1213004-1), and New Century Excellent Talents in University (NCET-11-0644). Use of the National Synchrotron Light Source, Brookhaven National Laboratory (BNL), was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. The authors would also like to acknowledge the X18A beamline support staff at BNL.

语种：英文

外文关键词：Particle size - Oxygen - Sodium bicarbonate - Solar fuels - Nanocatalysts - X ray absorption

摘要：Oxygen evolution from water poses a significant challenge in solar fuel production because it requires an efficient catalyst to bridge the one-electron photon capture process with the four-electron oxygen evolution reaction (OER). Here, a new strategy was developed to synthesize nonsupported ultrasmall cobalt oxide nanocubanes through an in situ phase transformation mechanism using a layered Co(OH)(OCH3) precursor. Under sonication, the precursor was exfoliated and transformed into cobalt oxide nanocubanes in the presence of NaHCO3-Na2SiF6 buffer solution. The resulting cobalt catalyst with an average particle size less than 2 nm exhibited a turnover frequency of 0.023 per second per cobalt in photocatalytic water oxidation. X-ray absorption results suggested a unique nanocubane structure, where 13 cobalt atoms fully coordinated with oxygen in an octahedral arrangement to form 8 Co4O4 cubanes, which may be responsible for the exceptionally high OER activity.