Electrolysis on a Chip with Tunable Thin Film Nanostructured PGM Electrocatalysts Generated from Self-Assembled Block Copolymer Templates.
block copolymers
electrocatalysts
hydrogen pumps
platinum group metals
water electrolysis
Journal
Small (Weinheim an der Bergstrasse, Germany)
ISSN: 1613-6829
Titre abrégé: Small
Pays: Germany
ID NLM: 101235338
Informations de publication
Date de publication:
Jun 2021
Jun 2021
Historique:
revised:
29
03
2021
received:
25
01
2021
pubmed:
16
5
2021
medline:
16
5
2021
entrez:
15
5
2021
Statut:
ppublish
Résumé
Self-assembled block copolymers are promising templates for fabricating thin film materials with tuned periodic feature sizes and geometry at the nanoscale. Here, a series of nanostructured platinum and iridium oxide electrocatalysts templated from poly(styrene)-block-poly(vinyl pyridine) (PSbPVP) block copolymers via an incipient wetness impregnation (IWI) pathway is reported. Both nanowire and nanocylinder electrocatalysts of varying feature sizes are assessed and higher catalyst loadings are achieved by the alkylation of the pyridine moieties in the PVP block prior to IWI. Electrocatalyst evaluations featuring hydrogen pump and water electrolysis demonstrations are carried out on interdigitated electrode (IDE) chips flexible with liquid supporting electrolytes and thin film polymer electrolytes. Notably, the mass activities of the nanostructured electrocatalysts from alkylated block copolymer templates are 35%-94% higher than electrocatalysts from non-alkylated block copolymer templates. Standing cylinder nanostructures lead to higher mass activities than lamellar variants despite their not having the largest surface area per unit catalyst loading demonstrating that mesostructure architectures have a profound impact on reactivity. Overall, IDE chips with model thin film electrocatalysts prepared from self-assembled block copolymers offer a high-throughput experimental method for correlating electrocatalyst nanostructure and composition to electrochemical reactivity.
Identifiants
pubmed: 33991064
doi: 10.1002/smll.202100437
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2100437Subventions
Organisme : U.S. Department of Energy
Organisme : Office of Science
Organisme : Office of Basic Energy Sciences Separation Science
ID : DE-SC0018989
Organisme : Argonne National Laboratory
ID : DE-AC02-06CH11357
Organisme : Nanofabrication Facility and Center for Advanced Microstructures and Devices
Informations de copyright
© 2021 Wiley-VCH GmbH.
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