光电流
锐钛矿
金红石
材料科学
分解水
纳米棒
载流子
异质结
析氧
化学工程
量子点
动力学
可见光谱
光电子学
光化学
纳米技术
电极
光催化
化学
电化学
催化作用
物理化学
工程类
生物化学
物理
量子力学
作者
Tingsheng Zhou,Shuai Chen,Linsen Li,Jiachen Wang,Yan Zhang,Jinhua Li,Jing Bai,Ligang Xia,Qing Xu,Mohammadi Rahim,Baoxue Zhou
标识
DOI:10.1016/j.apcatb.2020.118776
摘要
TiO2 is a promising photoanode material for photoelectrochemical (PEC) water splitting, but its severe bulk recombination of photogenerated carriers, sluggish oxygen evolution reaction (OER) kinetics and poor visible light response are the main bottleneck problems. Here, the carbon quantum dots (CQDs) modified anatase/rutile TiO2 photoanode (CQDs/A/R-TiO2) was designed by growth of anatase TiO2 nanothorns on rutile TiO2 nanorods and further surface modification of CQDs. The results revealed that the A/R-TiO2 heterojunction significantly suppressed the bulk recombination of photogenerated carriers. With further incorporation of CQDs into A/R-TiO2, dramatical improvement of OER kinetics and ultraviolet-visible (UV–vis) light harvesting were obtained. The bulk charge separation efficiency (ηbulk) and surface charge injection efficiency (ηsurface) of CQDs/A/R-TiO2 are 1.69 and 5.74 times higher than that of the pristine TiO2 at 0.6 V vs. RHE, respectively. Meanwhile, the photocurrent is increased by 11.72 times and the onset potential is negatively shifted by 240 mV for CQDs/A/R-TiO2.
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