Photocathode Chromophore–Catalyst Assembly via Layer-By-Layer Deposition of a Low Band-Gap Isoindigo Conjugated Polyelectrolyte

Leem, Gyu; Black, Hayden T.; Shan, Bing; Bantang, Jose P.  O.; Meyer, Thomas J.; Reynolds, John R.; Schanze, Kirk S.

doi:10.1021/acsaem.7b00223

Photocathode Chromophore–Catalyst Assembly via Layer-By-Layer Deposition of a Low Band-Gap Isoindigo Conjugated Polyelectrolyte

Journal Article · Wed Jan 03 00:00:00 EST 2018 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.7b00223· OSTI ID:1470088

^[1]; Black, Hayden T. ^[2]; Shan, Bing ^[3]; Bantang, Jose P. O. ^[4]; ^[3]; ^[2]; ^[1]

Univ. of Texas at San Antonio, TX (United States). Dept. of Chemistry
Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics, and Electronics, Georgia Tech Polymer Network
Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
Univ. of Texas at San Antonio, TX (United States). Dept. of Chemistry; De La Salle Univ., Manila (Philippines). Dept. of Chemistry

Low band-gap conjugated polyelectrolytes (CPEs) can serve as efficient chromophores for use on photoelectrodes for dye-sensitized photoelectrochemical cells. Herein is reported a novel CPE based on poly(isoindigo-co-thiophene) with pendant sodium butylsulfonate groups (PiIT) and its use in construction of layer-by-layer (LbL) chromophore–catalyst assemblies with a Pt-based H+ reduction catalyst (PAA-Pt) for water reduction. A novel Stille polymerization/postpolymerization ion-exchange strategy was used to convert an organic-soluble CPE to the water-soluble poly(isoindigo-co-thiophene). The anionic PiIT polyelectrolyte- and polyacrylate-stabilized Pt-nanoparticles (PAA-Pt) were codeposited with cationic poly(diallyldimethylammonium) chloride (PDDA) onto inverse opal (IO), nanostructured indium tin oxide film (nITO) (IO nITO) atop fluorine doped tin oxide (FTO), by using LbL self-assembly. To evaluate the performance of novel conjugated PiIT//PAA-Pt chromphore–catalyst assemblies, interassembly hole transfer was investigated by photocurrent density measurements on FTO//IO nITO electrodes. Enhanced cathodic photocurrent is observed for the polychromophore–catalyst assemblies, compared to electrodes modified with only PiIT, pointing toward photoinduced hole transfer from the excited PilT to the IO nITO. Prolonged photoelectrolysis experiments reveal H2 production with a Faradaic yield of approximately 45%. This work provides new routes to carry out visible-light-driven water reduction using photocathode assemblies based on low band-gap CPEs.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Solar Fuels (UNC EFRC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001011

OSTI ID:: 1470088

Journal Information:: ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 1 Vol. 1; ISSN 2574-0962

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Photocathode Chromophore–Catalyst Assembly via Layer-By-Layer Deposition of a Low Band-Gap Isoindigo Conjugated Polyelectrolyte

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