Measuring oxygen reduction/evolution reactions on the nanoscale

Amit Kumar, Francesco Ciucci, Anna N. Morozovska, Sergei V. Kalinin, Stephen Jesse

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198 Citations (Scopus)

Abstract

The efficiency of fuel cells and metal-air batteries is significantly limited by the activation of oxygen reduction and evolution reactions. Despite the well-recognized role of oxygen reaction kinetics on the viability of energy technologies, the governing mechanisms remain elusive and until now have been addressable only by macroscopic studies. This lack of nanoscale understanding precludes optimization of material architecture. Here, we report direct measurements of oxygen reduction/evolution reactions and oxygen vacancy diffusion on oxygen-ion conductive solid surfaces with sub-10 nm resolution. In electrochemical strain microscopy, the biased scanning probe microscopy tip acts as a moving, electrocatalytically active probe exploring local electrochemical activity. The probe concentrates an electric field in a nanometre-scale volume of material, and bias-induced, picometre-level surface displacements provide information on local electrochemical processes. Systematic mapping of oxygen activity on bare and platinum-functionalized yttria-stabilized zirconia surfaces is demonstrated. This approach allows direct visualization of the oxygen reduction/evolution reaction activation process at the triple-phase boundary, and can be extended to a broad spectrum of oxygen-conductive and electrocatalytic materials.

Original languageEnglish
Pages (from-to)707-713
Number of pages7
JournalNature chemistry
Volume3
Issue number9
DOIs
Publication statusPublished - Sep 2011

Bibliographical note

This research was conducted (A.K., S.J., S.V.K.) at the Center for Nanophase Materials Sciences, which is sponsored at the Oak Ridge National Laboratory by the Scientific User Facilities Division, US Department of Energy. F.C. acknowledges support from a Marie Curie Reintegration Grant FastCell-256583. The authors are grateful to P. Rack and J. Fowlkes for deposition of platinum nanoparticles.

Cite this

Kumar, A., Ciucci, F., Morozovska, A. N., Kalinin, S. V., & Jesse, S. (2011). Measuring oxygen reduction/evolution reactions on the nanoscale. Nature chemistry, 3(9), 707-713. https://doi.org/10.1038/NCHEM.1112