Enhancing long-term stability of bio-photoelectrochemical cell by defect engineering of a WO3-x photoanode

作者：Zhang, Cheng; Zheng, Xuchao; Ning, Yongyue; Li, Zihan; Wu, Zhongdong; Feng, Xiaoyu; Li, Gangyong^*; Huang, Zhongyuan^*; Hu, Zongqian^*

来源：Journal of Energy Chemistry, 2023, 80: 584-593.

DOI：10.1016/j.jechem.2023.02.003

• WO3
• Oxygen vacancy
• Oxygen reduction reaction
• Fuel-free
• Bio-photoelectrochemical cell

Bio-photoelectrochemical cells (BPECs) can further expand the use of conventional biofuel cells for renewable energy, but the poor stability of the photoelectrode still hinders their practical application. Herein, a BPEC capable of long-term operating in a fuel-free model is fabricated by WO3-x photoanode with oxygen vacancy (Ov) and bilirubin oxidase catalyzed biocathode. The construction of Ov on the WO3 surface significantly suppresses the dissolution of W species into the electrolyte, and improves the charge separation efficiency and the reaction kinetics during the photoelectrochemical oxygen evo-lution process, thus enhancing the stability and power output performance of the BPEC. As a result, the assembled BPEC can output an open circuit voltage of 0.81 V and deliver a maximum output power of up to 283 lW cm ?2. Impressively, the BPECs maintain 97% of their original power after 36000 s of con-secutive discharge under an enclosed environment. This fuel-free BPEC based on a robust WO3-xphotoan-ode shows excellent promise for accurate application.

• 单位
  新疆大学