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@article{Mo:2026:10.1021/acscatal.5c08411,
author = {Mo, T and Zalitis, CM and Jackson, C and Petrucco, E and Sharman, J and Kucernak, ARJ},
doi = {10.1021/acscatal.5c08411},
journal = {ACS Catal},
pages = {4266--4289},
title = {From Formation to Failure: The Role of Hydrogen Peroxide in Proton Exchange Membrane Technologies.},
url = {http://dx.doi.org/10.1021/acscatal.5c08411},
volume = {16},
year = {2026}
}

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TY  - JOUR
AB  - Hydrogen peroxide is a catalytic byproduct in proton exchange membrane fuel cells (PEMFCs) and proton exchange membrane water electrolyzers (PEMWEs). It may be produced as a side product of the electrochemical processes occurring at the cathode in PEMFCs, or at the anode in PEMWEs, or it may be produced due to gas crossover through either catalytic chemical or electrocatalytic processes. The challenge posed by H2O2 is its catalytic decomposition into highly reactive hydroxyl and peroxyl radicals, which trigger cascading degradation of critical components. This degradation directly compromises device efficiency and shortens the lifespan, representing a limiting factor in the durability of PEMFCs and PEMWEs. However, existing methods for detecting and quantifying in situ H2O2 generation are limited in their ability to accurately reflect real operating conditions (e.g., high current densities, mixed reactant environments), hindering a complete understanding of its dynamic (electro)-catalytic formation and impact. To address these gaps and advance the performance of hydrogen-based energy technologies, a comprehensive analysis of H2O2 (electro)-catalytic generation mechanisms, detrimental effects, and catalytic mitigation strategies is essential. In this work, we systematically review recent progress in H2O2 research for PEMFCs and PEMWEs, focusing on (1) underlying H2O2 (electro)-catalytic formation mechanisms, (2) the role of gas crossover in (electro)-catalytic H2O2 formation, (3) current detection techniques (and their limitations), and (4) emerging catalytic strategies for suppressing damage due to H2O2. This review highlights the need for improved in situ detection tools and targeted suppression approaches to enhance the reliability and longevity of PEMFCs and PEMWEsimportant technologies for hydrogen-based energy systems.
AU  - Mo,T
AU  - Zalitis,CM
AU  - Jackson,C
AU  - Petrucco,E
AU  - Sharman,J
AU  - Kucernak,ARJ
DO  - 10.1021/acscatal.5c08411
EP  - 4289
PY  - 2026///
SN  - 2155-5435
SP  - 4266
TI  - From Formation to Failure: The Role of Hydrogen Peroxide in Proton Exchange Membrane Technologies.
T2  - ACS Catal
UR  - http://dx.doi.org/10.1021/acscatal.5c08411
UR  - https://www.ncbi.nlm.nih.gov/pubmed/41816116
VL  - 16
ER  -

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