Dong Lin, Xu Yunlan, Zhong Dengjie, Chang Haixing, Li Jun, Liu Yi, Han Zhuofan
School of Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China.
School of Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China.
Chemosphere. 2023 Jun;325:138399. doi: 10.1016/j.chemosphere.2023.138399. Epub 2023 Mar 14.
In order to develop efficient photoanode to improve the performance of visible light responsive photocatalytic fuel cell (PFC), in this work, polyaniline/g-CN/BiO/Ti photoanode was successfully prepared using silica-sol drop coating method, and assembled with Cu cathode to construct PFC to decompose rhodamine B and generate electricity simultaneously. The degradation rate, maximum photocurrent density and maximum power density of this PFC were 91.23%, 0.086 mA cm and 4.78 μW cm, respectively, which were 1.4 and 1.8 times, 2.4 and 4.5 times, and 1.9 and 7.3 times those of the corresponding values of the PFCs with g-CN/BiO/Ti and BiO/Ti photoanodes, respectively. This is attributed to the type II heterojunction structure formed among polyaniline, g-CN and BiO in the polyaniline/g-CN/BiO/Ti photoanode. Among them, polyaniline has π-π conjugated structure, which can rapidly transfer the electronic charge between g-CN and BiO, thus enhancing the separation efficiency of photo-generated e-h pairs spatially and reducing their recombination, extending the visible light response wavelength of the photocatalyst, and finally improving its photocatalytic properties. This study can provide significant reference for the research of BiO-based visible light responsive PFC.
为了开发高效的光阳极以提高可见光响应型光催化燃料电池（PFC）的性能，在本工作中，采用硅溶胶滴涂法成功制备了聚苯胺/g-CN/BiO/Ti光阳极，并与铜阴极组装构建PFC，以同时分解罗丹明B并发电。该PFC的降解率、最大光电流密度和最大功率密度分别为91.23%、0.086 mA/cm²和4.78 μW/cm²，分别是具有g-CN/BiO/Ti和BiO/Ti光阳极的PFC相应值的1.4倍和1.8倍、2.4倍和4.5倍、1.9倍和7.3倍。这归因于聚苯胺/g-CN/BiO/Ti光阳极中聚苯胺、g-CN和BiO之间形成的II型异质结结构。其中，聚苯胺具有π-π共轭结构，能够在g-CN和BiO之间快速转移电荷，从而在空间上提高光生电子-空穴对的分离效率并减少其复合，扩展光催化剂的可见光响应波长，最终改善其光催化性能。本研究可为基于BiO的可见光响应型PFC的研究提供重要参考。
