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Open Access Publications from the University of California

A spongy nickel-organic CO2reduction photocatalyst for nearly 100% selective CO production

  • Author(s): Niu, K
  • Xu, Y
  • Wang, H
  • Ye, R
  • Xin, HL
  • Lin, F
  • Tian, C
  • Lum, Y
  • Bustillo, KC
  • Doeff, MM
  • Koper, MTM
  • Ager, J
  • Xu, R
  • Zheng, H
  • et al.

Copyright © 2017 The Authors, some rights reserved. Solar-driven photocatalytic conversion of CO2into fuels has attracted a lot of interest; however, developing active catalysts that can selectively convert CO2to fuels with desirable reaction products remains a grand challenge. For instance, complete suppression of the competing H2evolution 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 CO2to CO, with a production rate of ~1.6 × 104mmol hour−1g−1. No measurable H2is generated during the reaction, leading to nearly 100% selective CO production over H2evolution. When the spongy Ni-organic catalyst is enriched with Rh or Ag nanocrystals, the controlled photocatalytic CO2reduction 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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