Efficient solar water-splitting using a nanocrystalline CoO photocatalyst

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	Efficient solar water-splitting using a nanocrystalline CoO photocatalyst
	Liao, LB ; Zhang, QH ; Su, ZH ; Zhao, ZZ ; Wang, YN ; Li, Y ; Lu, XX ; Wei, DG ; Feng, GY ; Yu, QK ; Cai, XJ ; Zhao, JM ; Ren, ZF ; Fang, H ; Robles-Hernandez, F ; Baldelli, S ; Bao, JM
刊名	NATURE NANOTECHNOLOGY
	2014
卷号	9 期号:1 页码:69
ISSN号	1748-3387
通讯作者	Bao, JM (reprint author), Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA.
中文摘要	The generation of hydrogen from water using sunlight could potentially form the basis of a clean and renewable source of energy. Various water-splitting methods have been investigated previously(1-8), but the use of photocatalysts to split water into stoichiometric amounts of H-2 and O-2 (overall water splitting) without the use of external bias or sacrificial reagents is of particular interest because of its simplicity and potential low cost of operation(1-4). However, despite progress in the past decade, semiconductor water-splitting photocatalysts (such as (Ga1-x Zn-x)(N1-xOx)) do not exhibit good activity beyond 440 nm (refs 1,2,9) and water-splitting devices that can harvest visible light typically have a low solar-to-hydrogen efficiency of around 0.1%(6,7). Here we show that cobalt(II) oxide (CoO) nanoparticles can carry out overall water splitting with a solar-to-hydrogen efficiency of around 5%. The photocatalysts were synthesized from non-active CoO micropowders using two distinct methods (femtosecond laser ablation and mechanical ball milling), and the CoO nanoparticles that result can decompose pure water under visible-light irradiation without any co-catalysts or sacrificial reagents. Using electrochemical impedance spectroscopy, we show that the high photocatalytic activity of the nanoparticles arises from a significant shift in the position of the band edge of the material.
资助信息	Robert A. Welch Foundation [E-1728]; National Science Foundation [DMR 0907336]; Department of Energy [DE-FG02-13ER46917]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59390]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Liao, LB,Zhang, QH,Su, ZH,et al. Efficient solar water-splitting using a nanocrystalline CoO photocatalyst[J]. NATURE NANOTECHNOLOGY,2014,9(1):69.
APA	Liao, LB.,Zhang, QH.,Su, ZH.,Zhao, ZZ.,Wang, YN.,...&Bao, JM.(2014).Efficient solar water-splitting using a nanocrystalline CoO photocatalyst.NATURE NANOTECHNOLOGY,9(1),69.
MLA	Liao, LB,et al."Efficient solar water-splitting using a nanocrystalline CoO photocatalyst".NATURE NANOTECHNOLOGY 9.1(2014):69.