journal article·2023-04-14Open access

Operando Label-Free Optical Imaging of Solution-Phase Ion Transport and Electrochemistry

James K. Utterback, Alex J. King, Livia Belman-Wells, David M. Larson, Leo M. Hamerlynck, Adam Z. Weber, Naomi S. Ginsberg

ACS Energy Letters· Volume 8· Issue 4

Abstract

High Resolution Image Download MS PowerPoint Slide Ion transport is a fundamental process in many physical, chemical, and biological phenomena, and especially in electrochemical energy conversion and storage. Despite its immense importance, demonstrations of label-free, spatially and temporally resolved ion imaging in the solution phase under operando conditions are not widespread. Here we spatiotemporally map ion concentration gradient evolution in solution and yield ion transport parameters by refining interferometric reflection microscopy, obviating the need for absorptive or fluorescent labels. As an example, we use an electrochemical cell with planar electrodes to drive concentration gradients in a ferricyanide-based aqueous redox electrolyte, and we observe the lateral spatiotemporal evolution of ions via concentration-dependent changes to the refractive index. Analysis of an evolving spatiotemporal ion distribution directly yields the diffusivity of the redox-active species. The simplicity of this approach makes it amenable to probing local ion transport behavior in a wide range of electrochemical, bioelectronic, and electrophysiological systems.
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Research context

OpenAlex topics: Electrochemical Analysis and Applications · Analytical Chemistry and Sensors · Force Microscopy Techniques and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, University of California, Berkeley, California 94720, United States

Liquid-Sunlight Alliance, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Energy Conversion Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States

Department of Physics, University of California Berkeley, Berkeley, California 94720, United States

STROBE, National Science Foundation Science and Technology Center, University of California Berkeley, Berkeley, California 94720, United States

Materials Science Division and Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Funding

Basic Energy Sciences · Division of Graduate Education · Camille and Henry Dreyfus Foundation · David and Lucile Packard Foundation · Arnold and Mabel Beckman Foundation · U.S. Department of Defense · Division of Materials Research

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