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Issue 31, 2020

Tuning photoelectrochemical performance of poly(3-hexylthiophene) electrodes via surface structuring

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Abstract

Organic semiconductors are gaining increasing attention as promising active materials in aqueous electrochemical and photoelectrochemical applications. Controlling the semiconductor/electrolyte interface is a critical aspect. The aim of this work is to increase the electrochemical surface area of an archetypical polymeric semiconductor, poly(3-hexylthiophene), P3HT. Here we use a technique of blending with polystyrene, phase separation, followed by selective removal of polystyrene to obtain various nano/microstructures of P3HT. We evaluate how three-dimensional structuring of P3HT affects electrochemical capacitance, photovoltage generation, and photoelectrochemical currents. The aqueous wettability of the exposed surface is critical, and it can be significantly modified by employing oxygen plasma treatment. Structured and plasma-hydrophilized P3HT samples demonstrate higher photoelectrochemical currents for the oxygen reduction reaction. We find that regardless of structuring and photocurrent performance, the oxygen reduction on P3HT always proceeds to produce H2O2 with 90%+ faradaic efficiency. The results of our efforts are demonstrations of how to tune and to increase both electrochemical capacitive and faradaic behavior of P3HT layers. Our findings indicate some limitations imposed by the P3HT itself, including low photovoltages and photochemical bleaching. Overall, these findings answer several open questions in the field of P3HT photoelectrochemical interfaces, and provide some general guidelines that can be applied to other organic semiconducting materials.

Graphical abstract: Tuning photoelectrochemical performance of poly(3-hexylthiophene) electrodes via surface structuring

Article information


Submitted
23 Mar 2020
Accepted
12 Jun 2020
First published
22 Jun 2020

This article is Open Access

J. Mater. Chem. C, 2020,8, 10897-10906
Article type
Paper

Tuning photoelectrochemical performance of poly(3-hexylthiophene) electrodes via surface structuring

R. Wei, M. Gryszel, L. Migliaccio and E. D. Głowacki, J. Mater. Chem. C, 2020, 8, 10897 DOI: 10.1039/D0TC01477J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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