Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Electrocatalysts are essential components of many electrochemical technologies that are expected to be the “work horses” of a clean energy future. In our lab, we are developing novel electrocatalyst and photoelectrode architectures based on transition metal electrocatalysts that have been encapsulated by ultra-thin metal oxide overlayers. These oxide layers are synthesized with a room temperature process and deposited as uniform layers onto metallic thin films and nanoparticles. Importantly, these oxide overlayers are found to serve as “nano-membranes” that can be permeable to certain electroactive species and thereby enable efficient and selective electrocatalysis at the metal oxide / metal interface. By systematically varying the thickness of the oxide overlayer, we explore its transport properties and influence on the stability of the underlying transition metals during long term operation as hydrogen evolution catalysts. Oxide-encapsulated electrocatalysts have also been deposited onto the surface of photoelectrodes, revealing the additional advantage of greatly decreasing charge transfer resistance between the semiconductor and the nanoparticle electrocatalyst. Overall, these studies highlight the potential of well-defined oxide-encapsulated electrocatalysts to serve as a tunable, efficient, and stable platform for a variety of electrochemical reactions.
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