Electrolysis on a Chip with Tunable Thin Film Nanostructured PGM Electrocatalysts Generated from Self-Assembled Block Copolymer Templates

Bhattacharya, Deepra; Kole, Subarna; Kizilkaya, Orhan; Strzalka, Joseph; Angelopoulou, Polyxeni P.; Sakellariou, Georgios; Cao, Dongmei; Arges, Christopher G.

doi:10.1002/smll.202100437

Title: Electrolysis on a Chip with Tunable Thin Film Nanostructured PGM Electrocatalysts Generated from Self-Assembled Block Copolymer Templates

Journal Article · Fri May 14 00:00:00 EDT 2021 · Small

DOI:https://doi.org/10.1002/smll.202100437· OSTI ID:1813060

^[1];

^[1]; Kizilkaya, Orhan ^[2];

^[3]; Angelopoulou, Polyxeni P. ^[4]; Sakellariou, Georgios ^[4]; Cao, Dongmei ^[5];

^[1]

Louisiana State Univ., Baton Rouge, LA (United States)
Louisiana State Univ., Baton Rouge, LA (United States). Center for Advanced Microstructures and Devices
Argonne National Lab. (ANL), Lemont, IL (United States)
National and Kapodistrian Univ. of Athens (Greece)
Louisiana State Univ., Baton Rouge, LA (United States). Shared Instrumentation Facility

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE

Grant/Contract Number:: AC02-06CH11357; SC0018989

OSTI ID:: 1813060

Alternate ID(s):: OSTI ID: 1783063; OSTI ID: 1786615

Journal Information:: Small, Vol. 17, Issue 25; ISSN 1613-6810

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
block copolymers
electrocatalysts
hydrogen pumps
platinum group metals
water electrolysis

Title: Electrolysis on a Chip with Tunable Thin Film Nanostructured PGM Electrocatalysts Generated from Self-Assembled Block Copolymer Templates

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