Integrating photosystem II into a porous TiO2 nanotube network toward highly efficient photo-bioelectrochemical cells
Integrating photosystem II into a porous TiO2 nanotube network toward highly efficient photo-bioelectrochemical cells
复制标题
将光系统 II 集成到多孔 TiO2 纳米管网络中以实现高效光生物电化学电池
DOI：
10.1039/c6ta04964h
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发表时间：
2016-08-21
影响因子：
11.9
通讯作者：
Li, Junbai
中科院分区：
文献类型：
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作者：
Li, Jiao;Feng, Xiyun;Li, Junbai
将太阳能转化为电能的人工光合作用系统的构建对于满足人类对能源的需求具有重要意义，为此可以引入光系统II(PS II)，它是自然太阳能转换过程中分解水的核心酶。然而，在这种具有增强光电流响应的半人工光阳极系统的简易制备方面仍然存在重大挑战。在这里，我们报道了一种复合光阳极系统，它由菠菜中的PSII集成到纳米管二氧化钛修饰的铟锡氧化物电极上，该电极是以纤维素纸为支架合成的。这种电极为蛋白质的负载提供了明确的分级纳米结构，而细小的二氧化钛纳米晶促进了电子从PSII到电极的转移。由此得到的半导体-蛋白质复合光电化学体系增强了直接电子转移(1.3μA cm−2)和中介电子转移(10.6μA cm−2)光电流。
The fabrication of artificial photosynthetic systems to convert solar energy into electrical power is of great importance to meet human needs for energy; photosystem II (PSII), the core enzyme for water splitting in natural solar energy conversion processes can be introduced for this purpose. However, there remain significant challenges in the facile preparation of such semi-artificial photoanode systems with enhanced photocurrent responses. Herein we report a hybrid photoanode system consisting of PSII from spinach integrated into an indium-tin oxide electrode modified with nanotubular titania that is synthesized by using cellulose paper as a scaffold. This electrode provides a well-defined hierarchical nanostructure for protein loading, and the fine titania nanocrystals facilitate electron transfer from PSII to the electrode. The resulting semiconductor–protein hybrid photo-bioelectrochemical system enhances direct electron transfer (1.3 μA cm−2) and mediated electron transfer (10.6 μA cm−2) photocurrents.