Catalyst Formation and in Operando Monitoring of the Electrocatalytic Activity in Flow Reactors

Christian Iffelsberger, Stefan Wert, Frank Michael Matysik, Martin Pumera

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2 Citations (Scopus)


Flow reactors are of increasing importance and have become crucial devices due to their wide application in chemical synthesis, electrochemical hydrogen evolution reaction (HER), or electrochemical waste water treatment. In many of these applications, catalyst materials such as transition-metal chalcogenides (TMCs) for the HER, provide the desired electrochemical reactivity for the HER. Generally, the flow electrolyzers' performance is evaluated as the overall output, but the decrease in activity of the electrolyzer is due to localized failure of the catalyst. Herein, we present a method for the spatially resolved (tens of micrometers) In Operando analysis of the catalytic activity under real operation conditions as well as the localized deposition of the catalyst in an operating model flow reactor. For these purposes, scanning electrochemical microscopy was applied for MoSx catalyst deposition and for localized tracking of the TMC activity with a resolution of 25 μm. This approach offers detailed information about the catalytic performance and should find broad application for the characterization and optimization of flow reactor catalysis under real operational conditions.

Original languageEnglish
Pages (from-to)35777-35784
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number30
Publication statusPublished - 2021 Aug 4

Bibliographical note

Funding Information:
M.P. acknowledges the financial support by the Grant Agency of the Czech Republic (GACR EXPRO: 19-26896X). C.I. acknowledges the financial support by the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement no. 888797. C.I. gratefully acknowledges the CzechNanoLab project LM2018110 funded by MEYS CR for the financial support of the measurements/sample fabrication at CEITEC Nano Research Infrastructure.

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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