4.7 Article

Catalytic Mismatching of CuInSe2 and Ni3Al Demonstrates Selective Photoelectrochemical CO2 Reduction to Methanol

Journal

ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 1, Pages 109-113

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01441

Keywords

CO2 reduction; photoelectrochemistry; Ni3Al; CuInSe2; chalcogenides; methanol

Funding

  1. National Science Foundation [DGE-1148900, DGE-1656466, CHE-1800400]
  2. Princeton Center for Complex Materials, a National Science Foundation MRSEC program [DMR-1420541]

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Photoelectrochemical catalysts are often plagued by ineffective interfacial charge transfer or nonideal optical conversion properties. To overcome this challenge, strategically pairing a catalytically inactive, optically proficient semiconductor with a selective electrocatalyst, coined catalytic mismatching, is suggested. Here, chalcopyrite semiconductor CuInSe2 is paired with the electrocatalyst Ni3Al to selectively reduce CO2. This catalytically mismatched system produces methanol at a Faradaic efficiency 25 times greater than that achieved using the purely electrochemical Ni3Al system while reducing the operating potential requirement by 600 mV. These results suggest that catalytic mismatching is a promising tactic to achieve reaction selectivity in synergistic photoelectrochemical CO2 reduction systems.

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