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Open Access Publications from the University of California

A spongy nickel-organic CO2 reduction photocatalyst for nearly 100% selective CO production.

  • Author(s): Niu, Kaiyang;
  • Xu, You;
  • Wang, Haicheng;
  • Ye, Rong;
  • Xin, Huolin L;
  • Lin, Feng;
  • Tian, Chixia;
  • Lum, Yanwei;
  • Bustillo, Karen C;
  • Doeff, Marca M;
  • Koper, Marc TM;
  • Ager, Joel;
  • Xu, Rong;
  • Zheng, Haimei
  • et al.

Solar-driven photocatalytic conversion of CO2 into fuels has attracted a lot of interest; however, developing active catalysts that can selectively convert CO2 to fuels with desirable reaction products remains a grand challenge. For instance, complete suppression of the competing H2 evolution during photocatalytic CO2-to-CO conversion has not been achieved before. We design and synthesize a spongy nickel-organic heterogeneous photocatalyst via a photochemical route. The catalyst has a crystalline network architecture with a high concentration of defects. It is highly active in converting CO2 to CO, with a production rate of ~1.6 × 104 μmol hour-1 g-1. No measurable H2 is generated during the reaction, leading to nearly 100% selective CO production over H2 evolution. When the spongy Ni-organic catalyst is enriched with Rh or Ag nanocrystals, the controlled photocatalytic CO2 reduction reactions generate formic acid and acetic acid. Achieving such a spongy nickel-organic photocatalyst is a critical step toward practical production of high-value multicarbon fuels using solar energy.

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