A. Jeremy Kropf

Amorphous and crystalline anode catalysts in proton exchange membrane electrolysis: Performance and long-term durability

Ai-Lin Chan, Haoran Yu, Matthew E. Sweers, Nancy N. Kariuki et autres

Coordination tuned Mn-based metal–ionic liquid frameworks for selective lignin catalysis

Oluwaseyi D. Saliu, Cancino Karoll, Alex Acquah, Madina Sissenbay et autres

A coordination-tuned MnOH-[HEA][HCOO] metal–ionic liquid framework achieves 91% conversion of 1,4-dimethoxybenzene and 93% lignin conversion, demonstrating the catalytic advantage of distorted Mn–O sites for selective C–C/C–O bond cleavage. Metal–ionic liquid frameworks (MIFs) combine the catalytic diversity of metal centers with the tunable …

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Understanding the Durability of Amorphous Iridium Oxide Catalyst in Proton Exchange Membrane Water Electrolyzers

Obeen Kwon, Hung-Ming Joseph Chang, Juhyun Oh, Lahiru Pasikku Hannadige et autres

Amorphous iridium oxide (A-IrO x ) is a promising anode catalyst for proton exchange membrane water electrolyzers (PEMWEs) due to its superior beginning-of-life (BOL) catalytic activity for oxygen evolution reaction (OER) 1-3 . Nonetheless, its limited long-term durability compared to crystalline iridium …

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The Impact of Hydrogen Crossover and Start-Stop Operation on Low Temperature Proton Exchange Membrane Water Electrolysis Degradation and Lifetime

Shaun M Alia, Samantha Medina, Ai-Lin Chan, Ricardo P. M. Duarte et autres

Hydrogen has unique advantages as an energy carrier, due to its high energy density, its ability in long term storage, and its ability to convert between electricity and chemical bonds. Although hydrogen currently has a role in transportation and agriculture, its use …

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Amorphous and Rutile Anode Catalysts: Performance and Long-Term Degradation in Proton Exchange Membrane Water Electrolysis

Ai-Lin Chan, Haoran Yu, Matthew E. Sweers, Jaehyung Park et autres

Applying anode catalysts—typically iridium oxide (IrO x )—at reduced loadings is a major R&D direction in PEM water electrolysis (PEMWE), however, it poses challenges for maintaining long-term stability 1,2 . To guide the development of next-generation materials, we evaluated both the initial …

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The Performance and Durability Evaluation of Amorphous and Rutile Iridium Catalysts in the Anode Catalyst Layer of Proton Exchange Membrane Water Electrolysis

Ai-Lin Chan, Haoran Yu, Jae-Hyung Park, Matthew E. Sweers et autres

Proton exchange membrane water electrolysis (PEMWE) is a key technique in low temperature electrolysis for hydrogen production. For electrochemical water splitting, iridium (Ir)-based catalysts are often used for oxygen evolution reaction (OER) at the anode due to the moderate activity and stability …

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In Situ and Operando S ynchrotron Characterization of Commercial Ir Oxide Catalysts for Water Electrolyzers

Matthew E. Sweers, Nancy N. Kariuki, A. Jeremy Kropf, Jae-Hyung Park et autres

To enable further adoption of proton exchange membrane water electrolysis (PEMWE), we must continue to advance our fundamental understanding of the activity and degradation mechanisms of state-of-the-art iridium-based oxide catalysts for the oxygen evolution reaction (OER). Here, we employ synchrotron-based X-ray diffraction …

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Synergy between Ni and Fe in NiFe aerogel oxygen evolution reaction catalyst: in situ 57 Fe Mössbauer and X-ray absorption spectroscopy studies

Haoran Yu, Matthew E. Sweers, Luigi Osmieri, A. Jeremy Kropf et autres

In situ spectroscopies reveal the increase of Fe and Ni valence states during oxygen evolution in anion-exchange-membrane water electrolyzers (AEMWE) for hydrogen production.

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(Invited) Understanding the Corrosion of Titanium Porous Transport Layers and Pt Coatings Using Potential and Time-Resolved Inductively-Coupled Plasma Mass Spectrometry

Deborah J. Myers, A. Jeremy Kropf, Nancy N. Kariuki, Ngoc Kim Dang

Titanium is the state-of-the-art material for porous transport layers (PTLs) for proton-exchange membrane water electrolyzers (PEMWEs) due to its stability and intrinsic electrical conductivity. However, titanium can develop an passivating, insulating oxide layer under the conditions of the PEMWE anode, thus reducing …

Tracking the Evolving Structure of Nickel–Iron Oxyhydroxide Oxygen Evolution Electrocatalysts in Alkaline Media

David A. Cullen, Haoran Yu, Raphaël P. Hermann, Xiang Lyu et autres

Anion exchange membrane water electrolyzers (AEMWEs) present a lower cost option for hydrogen generation with respect to their proton exchange membrane counterpart due to the possibility of utilizing platinum group metal-free catalysts to drive the oxygen evolution reaction (OER) at the anode. …

(Invited) Degradation Mechanisms, Diagnostics, and Mitigation in Proton Exchange Membrane Water Electrolyzers

Shaun M Alia, Elliot Padgett, Ai-Lin Chan, Sarah J. Blair et autres

Hydrogen has unique advantages as an energy carrier, with a high energy density and abilities for long term storage and conversion between electricity and chemical bonds. Although hydrogen currently has a significant role in transportation and agriculture, its use in energy consumption …

Aerogel-derived nickel-iron oxide catalysts for oxygen evolution reaction in alkaline media

Luigi Osmieri, Haoran Yu, Raphaël P. Hermann, Melissa E. Kreider et autres

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