Trace anodic migration of iridium and titanium ions and subsequent cathodic selectivity degradation in acid electrolysis systems

Jens-Peter B. Haraldsted; Zsolt Révay; Rasmus Frydendal; Arnau Verdaguer-casadevall; Jan Rossmeisl; Jakob Kibsgaard; Ib Chorkendorff

doi:10.1016/j.mtener.2019.100352

Trace anodic migration of iridium and titanium ions and subsequent cathodic selectivity degradation in acid electrolysis systems

Jens-Peter B. Haraldsted, Zsolt Révay, Rasmus Frydendal, Arnau Verdaguer-casadevall, Jan Rossmeisl, Jakob Kibsgaard, Ib Chorkendorff

Department of Chemistry

1 Citation (Scopus)

Abstract

The oxygen evolution reaction in acidic electrolyzers requires the presence of stable catalysts and current collectors at the anode. IrO₂ catalysts and Ti current collectors are among the best in this regard. We show evidence of iridium and titanium corrosion and subsequent membrane crossover in long-term experiments of proton-exchange membrane electrolyzers for H₂O₂ production. The accumulation of trace iridium at the cathode was linked to degraded performance and increased cathodic current from hydrogen evolution. Detection of trace metal content at the cathode electrodes was enabled by prompt-gamma ray activation analysis and neutron activation analysis. These findings are not just relevant for H₂O₂ electrolyzers but to any system using iridium-based anode catalysts, including CO₂ electroreduction.

Original language	English
Article number	100352
Journal	Materials Today Energy
Volume	14
Pages (from-to)	1-6
ISSN	2468-6069
DOIs	https://doi.org/10.1016/j.mtener.2019.100352
Publication status	Published - Dec 2019

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@article{85d77101ce03421cadb3ce923f6eed4f,

title = "Trace anodic migration of iridium and titanium ions and subsequent cathodic selectivity degradation in acid electrolysis systems",

abstract = "The oxygen evolution reaction in acidic electrolyzers requires the presence of stable catalysts and current collectors at the anode. IrO2 catalysts and Ti current collectors are among the best in this regard. We show evidence of iridium and titanium corrosion and subsequent membrane crossover in long-term experiments of proton-exchange membrane electrolyzers for H2O2 production. The accumulation of trace iridium at the cathode was linked to degraded performance and increased cathodic current from hydrogen evolution. Detection of trace metal content at the cathode electrodes was enabled by prompt-gamma ray activation analysis and neutron activation analysis. These findings are not just relevant for H2O2 electrolyzers but to any system using iridium-based anode catalysts, including CO2 electroreduction.",

author = "Haraldsted, {Jens-Peter B.} and Zsolt R{\'e}vay and Rasmus Frydendal and Arnau Verdaguer-casadevall and Jan Rossmeisl and Jakob Kibsgaard and Ib Chorkendorff",

year = "2019",

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doi = "10.1016/j.mtener.2019.100352",

language = "English",

volume = "14",

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journal = "Materials Today Energy",

issn = "2468-6069",

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T1 - Trace anodic migration of iridium and titanium ions and subsequent cathodic selectivity degradation in acid electrolysis systems

AU - Haraldsted, Jens-Peter B.

AU - Révay, Zsolt

AU - Frydendal, Rasmus

AU - Verdaguer-casadevall, Arnau

AU - Rossmeisl, Jan

AU - Kibsgaard, Jakob

AU - Chorkendorff, Ib

PY - 2019/12

Y1 - 2019/12

N2 - The oxygen evolution reaction in acidic electrolyzers requires the presence of stable catalysts and current collectors at the anode. IrO2 catalysts and Ti current collectors are among the best in this regard. We show evidence of iridium and titanium corrosion and subsequent membrane crossover in long-term experiments of proton-exchange membrane electrolyzers for H2O2 production. The accumulation of trace iridium at the cathode was linked to degraded performance and increased cathodic current from hydrogen evolution. Detection of trace metal content at the cathode electrodes was enabled by prompt-gamma ray activation analysis and neutron activation analysis. These findings are not just relevant for H2O2 electrolyzers but to any system using iridium-based anode catalysts, including CO2 electroreduction.

AB - The oxygen evolution reaction in acidic electrolyzers requires the presence of stable catalysts and current collectors at the anode. IrO2 catalysts and Ti current collectors are among the best in this regard. We show evidence of iridium and titanium corrosion and subsequent membrane crossover in long-term experiments of proton-exchange membrane electrolyzers for H2O2 production. The accumulation of trace iridium at the cathode was linked to degraded performance and increased cathodic current from hydrogen evolution. Detection of trace metal content at the cathode electrodes was enabled by prompt-gamma ray activation analysis and neutron activation analysis. These findings are not just relevant for H2O2 electrolyzers but to any system using iridium-based anode catalysts, including CO2 electroreduction.

U2 - 10.1016/j.mtener.2019.100352

DO - 10.1016/j.mtener.2019.100352

M3 - Journal article

SN - 2468-6069

VL - 14

SP - 1

EP - 6

JO - Materials Today Energy

JF - Materials Today Energy

M1 - 100352

ER -

Trace anodic migration of iridium and titanium ions and subsequent cathodic selectivity degradation in acid electrolysis systems

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