High H2 Evolution from Quantum Cu(II) Nanodot-Doped Two-Dimensional Ultrathin TiO2 Nanosheets with Dominant Exposed {001} Facets for Reforming Glycerol with Multiple Electron Transport Pathways
High H2 Evolution from Quantum Cu(II) Nanodot-Doped Two-Dimensional Ultrathin TiO2 Nanosheets with Dominant Exposed {001} Facets for Reforming Glycerol with Multiple Electron Transport Pathways
复制标题
DOI：
10.1021/acs.jpcc.6b01030
复制
发表时间：
2016-05
影响因子：
3.7
通讯作者：
Meng Zhang;Runze Sun;Yajun Li;Q. Shi;Lihong Xie;Jinsheng Chen;Xinhua Xu;Huixian Shi;Weirong Zh
中科院分区：
文献类型：
--
作者：
Meng Zhang;Runze Sun;Yajun Li;Q. Shi;Lihong Xie;Jinsheng Chen;Xinhua Xu;Huixian Shi;Weirong Zh
采用原位光沉积法制备了掺杂量子Cu（II）纳米点（QCNs）的二维TiO 2纳米片，并用于甘油的重整反应.优化的QCNs掺杂剂表现出良好的H2的进化率高达25倍相比，裸二氧化钛。所制备的QCN渗透到均匀的{001}面中，导致不连续的量子纳米点掺杂，这通过能量色散X射线（EDX）光谱证实。分析表明，光生电子-空穴对复合速率的抑制和寿命的延长有利于提高光催化性能。电子自旋共振（ESR）谱证实了掺杂QCN引入的光致界面电荷转移（IFCT）效应。这为氧化还原反应提供了更多的光生电子和空穴，包括H2的产生以及CO2和CO的产率。电化学测试结果表明，QCN能提高光电流密度，改变电导率。
Two-dimensional (2D) ultrathin TiO2 nanosheets doped with quantum Cu(II) nanodots (QCNs) were synthesized through an in situ photodeposition for reforming glycerol. The optimized QCNs dopant exhibited favorable H2 evolution rate of up to 25-fold compared with bare TiO2. The prepared QCNs permeated into the homogeneous {001} facets resulting in discontinuous quantum nanodot doping, which was confirmed by energy-dispersive X-ray (EDX) spectroscopy. Analysis suggests that the suppressed recombination rate of the photoinduced electron–hole pair and the prolonged lifetime are benefits for enhancing photocatalytic performance. A photoinduced interfacial charge-transfer (IFCT) effect introduced by doping QCN was certified by electron spin resonance (ESR) spectroscopy. This offered more photoinduced electrons and holes for redox reaction including H2 production and CO2 and CO yields. Electrochemical characterizations were carried out to reveal that QCN could improve the photocurrent density and shift the conducti...