Enhancing the photoelectrochemical water splitting activity of rutile nanorods by removal of surface hydroxyl groups
Enhancing the photoelectrochemical water splitting activity of rutile nanorods by removal of surface hydroxyl groups
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DOI：
10.1016/j.cattod.2015.05.022
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发表时间：
2016-01-01
期刊：
影响因子：
5.3
通讯作者：
Li, Yongdan
中科院分区：
文献类型：
--
作者：
Jiang, Shaohong;Li, Yang;Li, Yongdan
研究了金红石型纳米棒表面羟基对光电化学（PEC）分解水性能的影响。基于表征结果，表面OH基团被证明作为光生电荷的复合中心，并阻碍界面处的电荷转移。H2 O2热处理和退火处理，以减少OH基团的表面覆盖，都被证明是有效的。随着相对表面OH覆盖率从47%降低到8%，光电流密度从0.419增加到0.642 mA cm（-2）（在0 V（vs. Ag/AgCl）），实现53.2%的改善。与热处理相比，H2 O2处理更有效，更节能。这项工作强调了材料本身的表面性质是设计用于水分解的PEC电极的重要因素。(C)2015 Elsevier B. V.版权所有。
The effect of the surface hydroxyl (OH) groups on the photoelectrochemical (PEC) water splitting performance of rutile nanorod is examined. Based on the results of characterization, the surface OH groups are demonstrated to serve as the recombination centers for the photo-generated charges and to hinder the charge transfer at the interfaces. H2O2 thermal and anneal treatments are applied to reduce the OH group surface coverage and both are proved effective. With reducing the relative surface OH coverage from 47 to 8%, the photocurrent density is increased from 0.419 to 0.642 mA cm(-2) at 0 V (vs. Ag/AgCl), achieving 53.2% improvement. Compared with the thermal treatment, H2O2 treatment is more effective and energy-efficient. This work highlights that the surface property of the material itself is an important factor in the design of the PEC electrodes for water splitting. (C) 2015 Elsevier B.V. All rights reserved.