School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
Phys Chem Chem Phys. 2013 Jul 28;15(28):11717-22. doi: 10.1039/c3cp50459j.
In this study, we constructed an inverse opal structured hematite (IOS α-Fe2O3) as the photoanode of a photoelectrochemical (PEC) cell for efficient solar water splitting via a simple electrochemical process. At the same time, a series of affecting factors (template particle size, electrodeposition time and annealing temperature) to construct the IOS α-Fe2O3 photoanode on the photoelectrochemical water splitting were considered. Optimized PEC efficiency was observed for the IOS α-Fe2O3 photoanode annealed at 400 °C using the 250 nm sized-polystyrene (PS) colloid template and 9 minutes of electrodeposition time for the given specific Fe precursor solution. This resulted in the highest photocurrent density compared to other crossed conditions, which significantly achieved 3.1 mA cm(-2) at 0.5 V vs. Ag/AgCl reference electrode. The synthesis of the IOS α-Fe2O3 via an easy-to-control electrochemical process is described for first time that opens a possibility for constructing other oxide semiconductor photoanodes (not only well-known Si, Ti and Zr) with inverse opal structure.
在这项研究中，我们通过简单的电化学过程构建了具有反蛋白石结构的赤铁矿（IOS α-Fe2O3）作为光电化学（PEC）电池的光阳极，以实现高效的太阳能分解水。同时，我们考虑了一系列影响因素（模板粒径、电沉积时间和退火温度）来构建用于光电化学水分解的 IOS α-Fe2O3 光阳极。使用 250nm 尺寸的聚苯乙烯（PS）胶体模板和 9 分钟的电沉积时间，在给定的特定 Fe 前体溶液中，优化后的 IOS α-Fe2O3 光阳极在 400°C 下退火时表现出最高的 PEC 效率。与其他交叉条件相比，这导致了最高的光电流密度，在 0.5V 对 Ag/AgCl 参比电极时，光电流密度显著达到 3.1mA/cm²。首次通过易于控制的电化学过程合成 IOS α-Fe2O3，为构建具有反蛋白石结构的其他氧化物半导体光阳极（不仅是众所周知的 Si、Ti 和 Zr）开辟了可能性。
