Ti, Zn co-doped hematite photoanode for solar driven photoelectrochemical water oxidation

Ti, Zn co-doped hematite photoanode for solar driven photoelectrochemical water oxidation

Quansong Zhu[2]; Chunlin Yu[1]; Xingwang Zhang[1]

【期刊名称】《《能源化学：英文版》》 【年(卷),期】2024(028)008

【摘要】Although there have been many reports of metal doping to ameliorate the drawbacks of hematite as the photoanode for water oxidation, most of them focused on monometallic doping, and only a few of them payed attention to bimetallic doping. What is worse, the synergetic mechanism between two metal dopants was not sufficiently studied, especially the density functional theory(DFT) calculation. In this work, the n-type hematite was synthesized by introducing Ti dopant into hematite through the hydrothermal method, and dipping-sintering treatment was employed to further introduce homogeneously dispersed Zn dopant into that, forming the Ti, Zn co-doped hematite. Under the optimal condition, Tidoped hematite photoanode reached approximately 2-times enhancement of the photocurrent density compared with the pristine one at 1.23 V vs. RHE, while Ti, Zn co-doped hematite anode obtained another25% elevation. UV–Vis spectroscopy, Mott–Schottky

plots,

EIS

analysis,

photo-oxidation

of

hole

scavenger(H2O2), and DFT calculation were employed to understand the role of Ti, Zn dopant. Based on the obtained results, the synergetic