Kim, Ye Ji
Lim, Ahyoun
Lee, Gyu Rac
Kim, Minjoon
Kim, Jin Young
Kim, Jong Min
Jung, Yeon Sik
Park, Hyun S.
2024-01-19T08:32:49Z
2024-01-19T08:32:49Z
2023-07-06
2023-10
1616-301X
https://pubs.kist.re.kr/handle/201004/113245
Bifunctional catalysts based on noble metals have achieved practical-level performances in round-trip energy conversion systems. However, the required amount of noble metals should be substantially reduced via a new catalyst design that can pursue the synergy of the constituent materials' intrinsic properties and architectural maneuver over reactant/product transport. In this study, cross-stacked Ir and Pt nanowires resolved the bottlenecks of two reactions essential for the hydrogen-based energy system: i) hydrogen spillover phenomenon between Pt and Ir nanowires to expedite the hydrogen oxidation reaction and ii) spacing Ir nanowires sufficiently to enhance the mass transport of the oxygen evolution reaction. Simultaneously accommodating the different strategies within the single catalyst layer, a new horizon to design a bifunctional electrode is proposed with the high performance of polymer electrolyte membrane unitized regenerative fuel cells: 47% of round-trip efficiency at 0.5 A cm(-2) with total noble metal loading < 0.3 mg cm(-2).
English
John Wiley & Sons Ltd.
Bifunctional Electrode Design Targeting Co-Enhanced Kinetics and Mass Transport for Hydrogen and Water Oxidation Reactions
Article
10.1002/adfm.202302586
1
Advanced Functional Materials, v.33, no.40
Advanced Functional Materials
33
40
N
scie
scopus
001010559200001
2-s2.0-85162028042
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
Article
REGENERATIVE FUEL-CELL
EVOLUTION REACTION OER
ENERGY-STORAGE
CATALYSTS
ELECTROCATALYST
REDUCTION
EFFICIENT
NANOPARTICLES
PERFORMANCE
DURABILITY
3D nanostructure engineering
catalysts
hydrogen oxidation reaction
oxygen evolution reaction
polymer electrolyte membrane unitized regenerative fuel cells