Wang Jian, Su Jinzhan, Guo Liejin
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P. R. China.
Chem Asian J. 2016 Aug 19;11(16):2328-34. doi: 10.1002/asia.201600888. Epub 2016 Aug 2.
Two-dimensional (2D) hematite nanoplate arrays were synthesized directly on fluorine-doped tin oxide (FTO)-coated glass by using a facile and novel hydrothermal method. High-temperature annealing retained the morphology of the nanoplate arrays while simultaneously introducing porosity. The thickness and length of the nanoplates could be tailored by adjusting the precursor composition. Photoelectrochemical (PEC) measurements showed that the photocurrent generated with bare hematite nanoplate photoelectrode under backside illumination was about four times of that under frontside illumination in the entire bias range used, which suggested that slow electron transport was a limiting factor for its PEC performance. Upon Sn doping and Co-Pi co-catalyst addition, the photocurrent increased significantly owing to the enhancement of electron conductivity and oxidation kinetics. Electrochemical impedance spectroscopy (EIS) measurements were conducted to understand the surface properties of the nanoplate arrays. Since this strategy is simple, cost-effective, and highly reproducible, it provides exciting opportunities for the large-scale growth of porous 2D metal oxide photoelectrodes for a variety of photoelectrochemical and photocatalytic applications.
采用一种简便新颖的水热法，在氟掺杂氧化锡（FTO）涂层玻璃上直接合成了二维（2D）赤铁矿纳米片阵列。高温退火保留了纳米片阵列的形态，同时引入了孔隙率。通过调整前驱体组成可以定制纳米片的厚度和长度。光电化学（PEC）测量表明，在整个使用的偏压范围内，背面光照下的裸赤铁矿纳米片光电极产生的光电流约为正面光照下的四倍，这表明缓慢的电子传输是其PEC性能的限制因素。通过Sn掺杂和添加Co-Pi共催化剂，由于电子传导性和氧化动力学的增强，光电流显著增加。进行了电化学阻抗谱（EIS）测量以了解纳米片阵列的表面性质。由于该策略简单、经济高效且具有高度可重复性，它为大规模生长用于各种光电化学和光催化应用的多孔二维金属氧化物光电极提供了令人兴奋的机会。
