Photoelectrochemical water oxidation and longevous photoelectric conversion by a photosystem II electrode
Document Type
Journal Article
Publication Title
Advanced Energy Materials
Volume
11
Issue
30
Publisher
Wiley
School
School of Engineering
RAS ID
39614
Funders
Australian Research Council Advanced Queensland Partnership Project
Grant Number
ARC Number : DP170104264, DP190103548
Grant Link
http://purl.org/au-research/grants/arc/DP170104264 http://purl.org/au-research/grants/arc/DP190103548
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.
DOI
10.1002/aenm.202100911
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Comments
Tian, W., Zhang, H., Sibbons, J., Sun, H., Wang, H., & Wang, S. (2021). Photoelectrochemical water oxidation and longevous photoelectric conversion by a photosystem II electrode. Advanced Energy Materials, 11(30), article 2100911. https://doi.org/10.1002/aenm.202100911