AI Article Synopsis
- Catalyst poisoning significantly shortens the lifespan of catalysts and raises costs, particularly affecting electrocatalysts used in green energy technologies like fuel cells and flow batteries.
- Current protective solutions for electrocatalysts are not very effective, as they don’t selectively target harmful species without impeding necessary reactions.
- This article discusses a method using atomic layer deposition (ALD) to apply a vanadium oxide (VO) coating on a platinum catalyst, enhancing hydrogen transport, increasing mass activity in alkaline conditions, and successfully protecting the catalyst from rapid dissolution in harsh electrolyte environments.
Article Abstract
Catalyst poisoning is a prominent issue, reducing the lifetime of catalysts and increasing the costs of the processes that rely on them. The electrocatalysts that enable green energy conversion and storage, such as proton exchange membrane fuel cells and hydrogen bromine redox flow batteries, also suffer from this issue, hindering their utilization. Current solutions to protect electrocatalysts from harmful species fall short of effective selectivity without inhibiting the required reactions. This article describes the protection of a standard 50% Pt/C catalyst with a VO coating through atomic layer deposition (ALD). The ALD selectively deposited VO on the Pt, which enhanced hydrogen transport to the Pt surface and resulted in a higher mass activity in alkaline electrolytes. Cyclic voltammetry and X-ray photoelectron spectroscopy showed that the Pt was protected by the coating in the HBr/Br electrolyte which dissolved the uncoated 50% Pt/C in under 3 min.
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| http://dx.doi.org/10.1021/acsami.1c20181 | DOI Listing |
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