Polymer Entrapment Flash Pyrolysis for the Preparation of Nanoscale Iridium-Free Oxygen Evolution Electrocatalysts

Shih, Pei‐Chieh; Zhang, Cheng; Raheja, Harshit; Sun, Cheng‐Jun; Yang, Hong

doi:10.1002/cnma.202000124

Polymer Entrapment Flash Pyrolysis for the Preparation of Nanoscale Iridium-Free Oxygen Evolution Electrocatalysts

Journal Article · Mon Mar 23 00:00:00 EDT 2020 · ChemNanoMat

DOI:https://doi.org/10.1002/cnma.202000124· OSTI ID:1774242

Shih, Pei‐Chieh ^[1]; Zhang, Cheng ^[1]; Raheja, Harshit ^[1]; Sun, Cheng‐Jun ^[2]; ^[1]

Univ. of Illinois at Urbana-Champaign, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)

This paper describes the use of a new polymer entrapment flash pyrolysis (PEFP) method for making nanoscale yttrium ruthenate (Y₂Ru₂O_7-δ) electrocatalysts. Here, this approach effectively reduced the synthesis temperature of phase-pure pyrochlore catalysts from 1000 °C to 550 °C, and greatly suppressed the sintering of catalyst particles. The supported nanocrystalline Y₂Ru₂O_7-δ catalysts showed enhanced activity towards oxygen evolution reaction (OER) in acidic electrolyte and were stable at 1.50 V for the comparative study (>20 h) under the current density of 10 mA/cm²_geo in chronopotentiometry testing. This is equivalent to an overpotential value of 270 mV, about half of that of the reference IrO₂ catalyst. X-ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM) analysis showed that the high-surface-area Y₂Ru₂O_7-δ catalyst had an oxygen-deficient structure. This study provides a route to the synthesis of fine ceramic (or oxide)-based electrocatalysts for making high-performing electrocatalysts.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1774242

Alternate ID(s):: OSTI ID: 1615032

Journal Information:: ChemNanoMat, Journal Name: ChemNanoMat Journal Issue: 6 Vol. 6; ISSN 2199-692X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Polymer Entrapment Flash Pyrolysis for the Preparation of Nanoscale Iridium-Free Oxygen Evolution Electrocatalysts

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