Conjugated Polymers with Oligoethylene Glycol Side Chains for Improved Photocatalytic Hydrogen Evolution Zhicheng Hu, Zhenfeng Wang, Xi Zhang, Haoran.

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Conjugated Polymers with Oligoethylene Glycol Side Chains for Improved Photocatalytic Hydrogen Evolution Zhicheng Hu, Zhenfeng Wang, Xi Zhang, Haoran Tang, Xiaocheng Liu, Fei Huang, Yong Cao iScience Volume 13, Pages 33-42 (March 2019) DOI: 10.1016/j.isci.2019.02.007 Copyright © 2019 The Author(s) Terms and Conditions

iScience 2019 13, 33-42DOI: (10.1016/j.isci.2019.02.007) Copyright © 2019 The Author(s) Terms and Conditions

Figure 1 Chemical Structures and Basic Properties of Conjugated Polymers (A) Chemical structures of PBDTBT-C6C10, PBDTBT-4EO, and PBDTBT-7EO. (B) UV-vis-NIR absorption spectra of PBDTBT-C6C10, PBDTBT-4EO, and PBDTBT-7EO. (C) Energy levels of conjugated polymers and the energy transfers among photocatalysts, co-catalysts, scarifying agent, and water. iScience 2019 13, 33-42DOI: (10.1016/j.isci.2019.02.007) Copyright © 2019 The Author(s) Terms and Conditions

Figure 2 TEM Images and XPS O1s Spectra (A–C) TEM images of PBDTBT-C6C10 (A), PBDTBT-4EO (B), and PBDTBT-7EO (C) dispersed in water (the scale bar in insets represents 10 nm). (D–F) XPS O1s spectra for PBDTBT-C6C10 (D), PBDTBT-4EO (E), and PBDTBT-7EO (F) films upon Pt sheets. iScience 2019 13, 33-42DOI: (10.1016/j.isci.2019.02.007) Copyright © 2019 The Author(s) Terms and Conditions

Figure 3 Photocatalytic Performance of Conjugated Polymers (A) Hydrogen evolution rates of the conjugated polymers with full spectra irradiation. (B) Hydrogen evolution rates of PBDTBT-7EO at full, >420 nm, and AM1.5 irradiation (reaction conditions: 2.5 mg of polymer dispersed in 50 mL of deionized water containing 0.2 M AA, pH = 4.0). (C) Absorption spectrum of PBDTBT-7EO and apparent quantum yield (AQY) values as a function of light wavelength. (D) Photoluminescence emission spectra of PBDTBT-C6C10, PBDTBT-4EO, and PBDTBT-7EO with/without Pt co-catalysts. iScience 2019 13, 33-42DOI: (10.1016/j.isci.2019.02.007) Copyright © 2019 The Author(s) Terms and Conditions

Figure 4 Photocurrent Response, EIS Nyquist Plots, and Mott–Schottky Plots (A and B) Photocurrent response of the conjugated polymers at applied voltages of 0 V (A) and −0.2 V (B) (with 0.1 M Na2SO4 as the electrolyte). (C) EIS Nyquist plots of conjugated polymers in the dark. (D) Mott–Schottky plots of PBDTBT-C6C10, PDBDTBT-4EO, and PBDTBT-7EO. iScience 2019 13, 33-42DOI: (10.1016/j.isci.2019.02.007) Copyright © 2019 The Author(s) Terms and Conditions

Figure 5 DFT Calculation (A and B) Optimized geometry of oligomers BDTBT-C10H21 (A) and BDTBT-3EO (B). (C and D) DOS of BDTBT-C10H21 (C) and BDTBT-3EO (D) with H+ adsorbed at nitrogen sites (the case of one hydrogen atom). iScience 2019 13, 33-42DOI: (10.1016/j.isci.2019.02.007) Copyright © 2019 The Author(s) Terms and Conditions