Utilizing a Siloxane-Modified Organic Semiconductor for Photoelectrochemical Water Splitting

Hyo Jin Ahn, Ki Yong Yoon, Mingi Sung, Hyeonjin Yoo, Hyungju Ahn, Byoung Hoon Lee, Junghoon Lee, Ji Hyun Jang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We explore the potential of employing diketopyrrolopyrrole (DPP) based π-conjugated OSs as a hole transport layer material in heteroatom-doped hematite (Ti-Fe2O3/Ge-Fe2O3) photoanodes for efficient photoelectrochemical water splitting. The siloxane-modified π-conjugated polymer (PSi) with a high carrier mobility and crystallinity revealed great potential to extract holes by forming a built-in potential with hematite photoanodes while showing high stability in an alkaline electrolyte for photoelectrochemical water oxidation. Because of the easy hole extraction and subsequent fast hole transport property of the PSi interlayer between NiFe(OH)x and Ge-doped porous Fe2O3(Ge-PH), NiFe(OH)x/PSi/Ge-PH showed a 1.8-fold increase in photocurrent density (4.57 mA cm-2 at 1.23 VRHE) with a cathodic shift of the onset potential (0.735 VRHE) and good stability for 65 h compared to Ge-PH. This study demonstrates the successful use of inherently unstable π-conjugated OSs as a hole extracting/transport medium in a photoanode, addressing the intrinsic recombination issues of hematite for efficient and stable water splitting.

Original languageEnglish
Pages (from-to)2595-2602
Number of pages8
JournalACS Energy Letters
Volume8
Issue number6
DOIs
StatePublished - 9 Jun 2023

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2021R1F1A1051912; NRF-2020R1A2C2014050; NRF-2019M1A2A2065612; NRF-2019R1F1A1043474).

Publisher Copyright:
© 2023 American Chemical Society.

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