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Yu, Je Min; Lee, Jungho; Kim, Yoon Seo; Song, Jaejung; Oh, Jiyeon; Lee, Sang Myeon; Jeong, Mingyu; Kim, Yongseon; Kwak, Ja Hun; Cho, Seungho; Yang, Changduk; Jang, Ji-Wook
Nature communications, 11/2020, Volume: 11, Issue: 1Journal Article
Abstract Considering their superior charge-transfer characteristics, easy tenability of energy levels, and low production cost, organic semiconductors are ideal for photoelectrochemical (PEC) hydrogen production. However, organic-semiconductor-based photoelectrodes have not been extensively explored for PEC water-splitting because of their low stability in water. Herein, we report high-performance and stable organic-semiconductors photoanodes consisting of p -type polymers and n -type non-fullerene materials, which is passivated using nickel foils, GaIn eutectic, and layered double hydroxides as model materials. We achieve a photocurrent density of 15.1 mA cm −2 at 1.23 V vs. reversible hydrogen electrode (RHE) with an onset potential of 0.55 V vs. RHE and a record high half-cell solar-to-hydrogen conversion efficiency of 4.33% under AM 1.5 G solar simulated light. After conducting the stability test at 1.3 V vs. RHE for 10 h, 90% of the initial photocurrent density are retained, whereas the photoactive layer without passivation lost its activity within a few minutes.
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