摘要
研究了碳量子点负载的Ti O2纳米棒阵列光阳极的光电化学过程和光催化行为。实验发现碳量子点的引入使Ti O2纳米棒阵列在可见光区域的吸收强度增强,对可见光的响应电流提高3倍,光照下的开路电位增加了2.5%,光生载流子的转移和传输能力得到相应提高。光阳极对亚甲基蓝的降解特性显示,碳量子点的引入使Ti O2纳米棒在可见光照射下的催化效率由25%提高到33%。利用电化学交流阻抗谱(EIS)、MottSchottky曲线讨论了光影响下的电荷运动过程,表明Ti O2纳米棒阵列负载碳量子点后的电荷转移电阻减小,电子寿命增加;碳量子点的负载使Ti O2纳米棒的平带电位负移,导带位置提高,电子的还原能力增强。
The photoelectrochemical ( PEC) performance and photocatalytic activity of TiO2 nanorod arrays ( NRs) loaded with carbon quantum dots ( CQDs) were investigated. In comparison with TiO2 NRs, the absorption ability of TiO2 NRs loaded with CQDs was enhanced. The transient photocurrent and open-circuit potential under visible light illumination were increased of 300% and 2 . 5%, re-spectively. After loaded with CQDs, the photocatalytic degradation efficiency of methylene blue ( MB) under visible light illumination was increased from 25% to 33%. The electrochemical imped-ance spectra ( EIS) and Mott-Schottky plots were measured to investigate the charge movement under the visible light illumination. The results suggest that the charge transfer resistance is reduced and the electron lifetime is increased for TiO2 NRs loaded with CQDs. The loading of CQDs can induce the flat-band potential negative shift and the conduction band position raise, resulting in the en-hancement of electron reduction properties.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2015年第8期898-905,共8页
Chinese Journal of Luminescence
基金
863国家高技术研究发展计划(2013AA014201)
国家重大科学仪器设备开发专项(2014YQ120351)
天津市自然科学基金(11JCYBJC00300
14JCZDJC31200
15JCYBJC16700
15JCYBJC16800)
天津市科技计划国际合作项目(14RCGHGX00872)资助
关键词
碳量子点
TiO2纳米棒阵列
平带电位
光催化
arbon quantum dots
TiO2 nanorod arrays
flat-band potential
photocatalysis
