Photoelectrochemical Water Oxidation and Longevous Photoelectric Conversion by a Photosystem II Electrode

Tian, Wenjie and Zhang, Huayang and Sibbons, Jane and Sun, Hongqi and Wang, Hao and Wang, Shaobin (2021) Photoelectrochemical Water Oxidation and Longevous Photoelectric Conversion by a Photosystem II Electrode. Advanced Energy Materials, 11 (30):2100911. pp. 1-13. ISSN 1614-6832


Abstract

The immobilization of natural photosystem II (PSII) enzyme onto an artificial electrode offers an ingenious and promising avenue for semiartificial solar energy conversion. However, this process is significantly limited by the poor stability and the short life of PSII. Here, a new prototype of a semiartificial system is reported by anchoring PSII on polyethylenimine-coated macroporous carbon electrode with a high load. Good electronic communication is established at the biointerface of this PSII electrode, enabling excellent photoelectrochemical (PEC) water oxidation and lasting electricity generation. The maximum turnover number of 10 200 ± 1380 mol O2 per mol PSII dimer is obtained in this system at around 10 h before complete deactivation, reaching high current-to-O2 conversion efficiencies. The functions of PSII to release O2 both in light and dark conditions as well as for H2O2 formation are revealed. Under periodic irradiation (AM 1.5G 1 sun), this PSII electrode allows for stable mediated photocurrent output of ≈4.31 µA cm−2 after five days, which represents the most stable photoelectric performance achieved so far for PSII-related electrodes.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 07 Mar 2022 23:56
Last Modified: 30 Mar 2022 05:14
Uncontrolled Keywords: photoelectric conversion; photosystem II; semiartificial photosynthetic systems; water oxidation
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
Identification Number or DOI: https://doi.org/10.1002/aenm.202100911
URI: http://eprints.usq.edu.au/id/eprint/46362

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