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Atomic-layered Au Clusters on α-MoC as Catalysts for the Low-temperature Water-gas Shift Reaction

The water-gas shift (WGS) reaction (CO+H2O=H2+CO2) is an essential process for hydrogen generation and CO removal in various energy-related chemical operations. This equilibrium-limited reaction is favored at a low working temperature. Potential application in fuel cells also requires a WGS catalyst to be highly active, stable and energy-efficient and match the working temperature of on-site hydrogen generation and consumption units. We synthesized Au layered clusters on an α-MoC substrate to create an interfacial catalyst system for the ultra-low-temperature WGS reaction. Water was activated over α-MoC at 303 Kelvin (K), while CO adsorbed on adjacent Au sites is apt to react with surface hydroxyl groups formed from water splitting, leading to a high WGS activity at low-temperatures. Au L3 edge XAFS spectra were measured at BL14W1 beamline of Shanghai Synchrotron Radiation Facility (SSRF) and Beijing Synchrotron Radiation Facility (BSRF).


Links: DOI: 10.1126/science.aah4321