A cracked carbon matrix decorated with amorphous IrOx for boosting the oxygen evolution reaction in electrochemical water splitting

Numerous studies have been performed to develop better materials and systems to boost H2 production by water splitting. IrO2 and Ti felt have been conventionally used in proton exchange membrane water electrolyzers (PEMWE) as anode catalysts and porous transport layers (PTLs), respectively. In this...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 11; no. 26; pp. 14221 - 14231
Main Authors Huynh, T B Ngoc, Lee, Dohyeon, Soo-Kil, Kim, Kim, Myung Jun, Kwon, Oh Joong
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 04.07.2023
Subjects
Amorphous materials
Carbon
Catalysts
Durability
Electrochemistry
Electrolytes
Hydrogen production
Nanoparticles
Oxygen evolution reactions
Water splitting
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Summary:Numerous studies have been performed to develop better materials and systems to boost H2 production by water splitting. IrO2 and Ti felt have been conventionally used in proton exchange membrane water electrolyzers (PEMWE) as anode catalysts and porous transport layers (PTLs), respectively. In this study, a cracked carbon matrix (CM) and amorphous IrOx nanoparticles were introduced to overcome the limitations of the current materials. Amorphous IrOx protected by thin carbon shells exhibited higher electrocatalytic activity for the O2 evolution reaction than commercial IrO2 and ensured sufficient durability under highly oxidative conditions. CM provided a sufficient surface area to disperse the IrOx nanoparticles, and its cracked nature facilitated the transport of electrolytes and produced O2. These merits enabled PEMWE to achieve 1 A cm−2 at a cell voltage of 1.64 V without severe degradation.
ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta01798b