A Permselective CeOx Coating To Improve the Stability of Oxygen Evolution Electrocatalysts. Issue 6 (5th January 2018)

• Record Type: Journal Article
• Authors: Obata, Keisuke; Takanabe, Kazuhiro
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 6(2018)
• Page Start: 1616
• Page End: 1620
• Publication Date: 2018-01-05
• Subjects: electrochemistry -- energy conversion -- heterogeneous catalysis -- oxygen evolution -- water splitting; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201712121
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Highly active NiFeO x electrocatalysts for the oxygen evolution reaction (OER) suffer gradual deactivation with time owing to the loss of Fe species from the active sites into solution during catalysis. The anodic deposition of a CeO x layer prevents the loss of such Fe species from the OER catalysts, achieving a highly stable performance. The CeO x 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 a permselective protective layer provides a new strategy for improving the durability of electrocatalysts. Abstract : A highly durable oxygen evolution system was achieved by deposition of a CeO x layer on electrocatalysts. The CeO x layer has permselectivity, which suppresses the diffusion of redox ions while allowing OH − and O2 to permeate through. This permselectivity contributes to maintain the active sites underneath, resulting in excellent stability without changing the kinetics of the catalysts.