A Permselective CeOx Coating Improves the Stability of Oxygen Evolution Electrocatalysts
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AbstractHighly active NiFeOx electrocatalysts for the oxygen evolution reaction (OER) suffer gradual deactivation with time due to the loss of Fe species from the active sites into solution during catalysis. Here, we describe the anodic deposition of a CeOx layer that prevents the loss of such Fe species from the OER catalysts, achieving a highly stable performance. The CeOx layer does not affect the OER activity of the catalyst underneath but exhibits unique permselectivity, allowing the permeation of OH- and O2 through while preventing the diffusion of redox ions through the layer to function as a selective O2-evolving electrode. The use of such permselective protective layer provides a new strategy for improving the durability of electrocatalysts.
CitationObata K, Takanabe K (2017) A Permselective CeOx Coating Improves the Stability of Oxygen Evolution Electrocatalysts. Angewandte Chemie International Edition. Available: http://dx.doi.org/10.1002/anie.201712121.
SponsorsThe research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). The authors appreciate the kind assistance of Dr. J. Bau at KAUST for TEM images.