期刊
SOLAR RRL
卷 4, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201900349
关键词
hafnium dioxide; hematites; photoelectrochemical water splitting; surface electronic structure reconfigurations
资金
- National Natural Science Foundation of China [51961165103, 21875183, 51672210]
- National Key Research and Development Program of China [2018YFB1502003, 2017YFE0193900]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities [MoST 107-2112-M-032-004MY3, 108-2218-E-032-003-MY3]
Hematite (alpha-Fe2O3) is a promising candidate as a semiconducting photoanode for photoelectrochemical (PEC) water splitting. However, its PEC performance is much limited by the sluggish charge transfer kinetics at the alpha-Fe2O3/electrolyte interface. Herein, an insulative metal oxide, hafnium dioxide (HfO2), is deposited on the surface of alpha-Fe2O3 to engineer the photoelectrode/electrolyte interfacial electronic structure. With the conformal HfO2 overlayer coating, the surface defects of alpha-Fe2O3 are effectively passivated, whereas the charge migration from alpha-Fe2O3 to the electrolyte is blocked by the continuous HfO2 overlayer, leading to a moderate PEC enhancement. In contrast, with HfO2 nanoparticles deposited, the photogenerated holes are not only effectively extracted from the bulk of alpha-Fe2O3 but are also promptly injected into the electrolyte for water oxidation, due to the reconfigurated surface electronic structure. Consequently, the HfO2 nanoparticles-decorated alpha-Fe2O3 photoanode achieves an onset potential cathodic shift by 180 mV and a 460% photocurrent density enhancement, reaching up to 1.20 mA cm(-2) at 1.23 V versus reversible hydrogen electrode as compared with pristine alpha-Fe2O3. An alternative approach to engineer the photoelectrode/electrolyte interfacial electronic structure to improve the PEC performance for water splitting is demonstrated herein.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据