467010 Gold-Supported Cerium-Doped NiOx Catalysts for Water Oxidation

Wednesday, November 16, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Desmond Ng1,2, Max GarcĂ­a-Melchor1, Michal Bajdich3, Pongkarn Chakthranont1, Charlotte Kirk1, Aleksandra Vojvodic4 and Thomas F. Jaramillo1, (1)Chemical Engineering, Stanford University, Stanford, CA, (2)ICES, A*STAR, Singapore, Singapore, (3)Department of Chemical Engineering, SUNCAT Center for Interface Science and Catalysis, Stanford University and SLAC National Accelerator Laboratory, Stanford, CA, (4)Stanford U. & SLAC National Accelerator Laboratory, Menlo Park, CA

The development of high-performance catalysts for the oxygen evolution reaction (OER) is critical for converting renewable electricity to fuels and chemicals cost-efficiently.[1] Herein we report the significant enhancement in the OER activity of electrodeposited NiOx films resulting from the dual effects of using a gold metal support and a cerium dopant.[2] This NiCeOx-Au catalyst achieves high OER activity in an alkaline environment, and is among the most active OER electrocatalysts reported to date. Based on theoretical modelling coupled with experimental observations, we attribute the activity to a combination of geometric, electronic and support effects, where highly active under-coordinated sites at the oxide-support interface are modified by the local chemical binding environment and by doping the host Ni oxide with Ce. The NiCeOx-Au catalyst is further demonstrated in a device context by coupling it with a nickel-molybdenum hydrogen evolution catalyst in a water electrolyser setup, which delivers 50 mA consistently at 1.5 V over 24 hours of continuous operation. This work deepens the understanding of complex multi-component catalytic systems by showing how electronic, geometric and support effects can be combined to enhance catalytic activity.

References

[1] Yang, Z., Zhang, J., Kintner-Meyer, M.C.W., Lu, X., Choi, D., Lemmon, J.P. & Liu, J. Electrochemical energy storage for green grid. Chem. Rev. 111, 3577-3613 (2011).

[2] Ng, J.W.D., Garcia-Melchor, M., Bajdich, M., Charthranont, P., Kirk, C., Vojvodic, A., Jaramillo, T.F. Gold-Supported cerium-doped NiOx catalysts for water oxidation. Nat. Energy. 1, 16053 (2016).


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