Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 158-167.DOI: 10.1016/j.jechem.2022.11.043

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Dual-functional marigold-like ZnxCd1-xS homojunction for selective glucose photoreforming with remarkable H2 coproduction

Fuyan Kanga,1, Cai Shia,1, Yeling Zhuc,1, Malin Eqia, Junming Shia, Min Tenga, Zhanhua Huanga,*, Chuanling Sib,*, Feng Jiangc,*, Jinguang Hud,*   

  1. aKey Laboratory of Bio-based Material Science and Technology, Ministry of Education, Material Science and Engineering College, Northeast Forestry University, Harbin 150040, Heilongjiang, China;
    bTianjin Key Laboratory of Pulp and Paper, College of Light Industry and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China;
    cSustainable Functional Biomaterials Lab, Department of Wood Science, University of British Columbia, 2424 Main Mall, Vancouver V6T 1Z4, Canada;
    dDepartment of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada
  • Received:2022-08-24 Revised:2022-11-18 Accepted:2022-11-24 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: nefuhzh@nefu.edu.cn (Z. Huang), sichli@tust.edu.cn (C. Si), feng.jiang@ubc.ca (F. Jiang), jinguang.hu@ucalgary.ca (J. Hu).
  • About author:1These authors contributed equally to this work.

Abstract: The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen (H2) and value-added chemicals production by biomass photoreform-ing. Herein, a novel dual-functional marigold-like ZnxCd1-xS homojunction has been the production of lac-tic acid with high-yield and H2 with high-efficiency by selective glucose photoreforming. The optimized Zn0.3Cd0.7S exhibits outstanding H2 generation (13.64 mmol h-1 g-1), glucose conversion (96.40%), and lactic acid yield (76.80%), over 272.80 and 19.21 times higher than that of bare ZnS (0.05 mmol h-1 g-1) and CdS (0.71 mmol h-1 g-1) in H2 generation, respectively. The marigold-like morphology provides abundant active sites and sufficient substrates accessibility for the photocatalyst, while the specific role of the homojunction formed by hexagonal wurtzite (WZ) and cubic zinc blende (ZB) in photoreforming biomass has been demonstrated by density functional theory (DFT) calculations. Glucose is converted to lactic acid on the WZ surface of Zn0.3Cd0.7S via the photoactive species .O-2, while the H2 is evolved from protons (H+) in H2O on the ZB surface of Zn0.3Cd0.7S. This work paves a promising road for the production of sustainable energy and products by integrating photocatalysis and biorefine.

Key words: ZnxCd1-xS homojunction, Selective glucose photoreforming, Biomass valorization, Sustainable H2, Photoreforming mechanism