Electrochemical Reactivity of Faceted β‑Co(OH)2 Single Crystal Platelet Particles in Alkaline Electrolytes
Posted on 2019-07-24 - 20:29
Oxygen
evolution reaction is the kinetic bottleneck in the generation
of H2 gas through the electrolysis of water. Understanding
how water is electrochemically converted to oxygen is key to the development
of high-performance electrocatalysts that can enable energy storage
technologies based on water to hydrogen fuel generation. The use of
well-defined metal oxide systems allows for the isolation of spatial
reactivity in bulk redox conversion and oxygen evolution reactions.
Herein, we investigate the electrochemical reactivity of well-faceted
single-crystalline β-Co(OH)2 platelet particles in
alkaline solutions as a function of pH, potential, and mass loading.
A geometrical model that describes the electrochemically active surface
area contributions for a porous electrode of stacked high-aspect ratio
particles is developed, which pinpoints the origin of reactivity for
redox conversion processes and oxygen evolution at the edge facets
of the particles.
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Mefford, J. Tyler; Akbashev, Andrew R.; Zhang, Liming; Chueh, William C. (2019). Electrochemical Reactivity of Faceted β‑Co(OH)2 Single Crystal Platelet Particles in Alkaline Electrolytes. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.9b03589