We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Donor‐Acceptor Conjugated Acetylenic Polymers for High‐Performance Bifunctional Photoelectrodes.
- Authors
Borrelli, Mino; An, Yun; Querebillo, Christine Joy; Morag, Ahiud; Neumann, Christof; Turchanin, Andrey; Sun, Hanjun; Kuc, Agnieszka; Weidinger, Inez M.; Feng, Xinliang
- Abstract
Due to the drastic required thermodynamical requirements, a photoelectrode material that can function as both a photocathode and a photoanode remains elusive. In this work, we demonstrate for the first time that, under simulated solar light and without co‐catalysts, donor‐acceptor conjugated acetylenic polymers (CAPs) exhibit both impressive oxygen evolution (OER) and hydrogen evolution (HER) photocurrents in alkaline and neutral medium, respectively. In particular, poly(2,4,6‐tris(4‐ethynylphenyl)‐1,3,5‐triazine) (pTET) provides a benchmark OER photocurrent density of ~200 μA cm−2 at 1.23 V vs. reversible hydrogen electrode (RHE) at pH 13 and a remarkable HER photocurrent density of ~190 μA cm−2 at 0.3 V vs. RHE at pH 6.8. By combining theoretical investigations and electrochemical‐operando Resonance Raman spectroscopy, we show that the OER proceeds with two different mechanisms, with the electron‐depleted triple bonds acting as single‐site OER in combination with the C4‐C5 atoms of the phenyl rings as dual sites. The HER, instead, occurs via an electron transfer from the tri‐acetylenic linkages to the triazine rings, which act as the HER active sites. This work represents a novel application of organic‐based materials and contributes to the development of high‐performance photoelectrochemical catalysts for the solar fuels' generation.
- Subjects
RESONANCE Raman spectroscopy; STANDARD hydrogen electrode; CHARGE exchange; OXYGEN reduction; PHOTOCURRENTS; CONJUGATED polymers
- Publication
ChemSusChem, 2024, Vol 17, Issue 7, p1
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.202301170