There is a growing interest in photosynthetic microorganisms for converting solar energy to electricity aiming at practical application. Despite extensive research, existing methods are suffered from limited photocurrent. Here we report that appreciable photocurrent can be generated in a photo‐bioelectrochemical cell (PBEC) where reduced graphene oxide‐coated ITO electrode is used as an anode and wild type cyanobacterium Anabaena variabilis as photo‐biocatalyst that oxidizes water by solar light. With A. variabilis dispersed in buffer and 1,4‐benzoquinone as a redox mediator, our PBEC produced photocurrent of 223 μA cm⁻² at an applied voltage of 0.4 V vs. Ag/AgCl. Incident photon to current efficiencies of 0.50 % and 5.2 % were obtained with white and monochromatic light at 660 nm, respectively. A complete PBEC with Pt/C cathode produced P_max of 13 μW cm⁻² at 115 μA cm⁻². Methodology in this study can be extended to cover other cyanobacteria, electrode materials, and mediators to further enhance photocurrent and power density. Our results demonstrate the possibility of utilizing cyanobacteria that are ubiquitous in the environment as alternative energy sources.

中文翻译：

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使用分散在溶液中的野生型鱼腥藻从单介导的光生化电化学电池产生增强的光电流

旨在实际应用的用于将太阳能转化为电的光合微生物的兴趣日益增长。尽管进行了广泛的研究，但是现有方法受到光电流有限的困扰。在这里我们报告说，在光生化电化学电池（PBEC）中可以产生可观的光电流，其中还原氧化石墨烯涂层的ITO电极用作阳极，野生型蓝细菌Anabaena variabilis作为光生物催化剂，通过太阳光将水氧化。与A.变异分散在缓冲液中与1,4-苯醌作为氧化还原介体，我们PBEC产生的光电流223μA厘米^-2相对于Ag / AgCl的施加电压为0.4V。用660nm处的白光和单色光分别获得0.50％和5.2％的入射光子电流效率。具有Pt / C阴极的完整PBEC在115μAcm ^-2时产生的P _max为13μWcm ^-2。本研究中的方法可以扩展到涵盖其他蓝细菌，电极材料和介体，以进一步增强光电流和功率密度。我们的结果证明了利用环境中普遍存在的蓝细菌作为替代能源的可能性。