Multiscale design for high-performance glycolic acid electro-synthesis cell: Preparation of nanoscale-IrO 2 -applied Ti anode and optimization of cell assembling

Takashi Fukushima, Manabu Higashi, Sho Kitano, Takeharu Sugiyama, Miho Yamauchi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Performance of a polymer electrolyte alcohol electrosynthesis cell (PEAEC) using a glycolic acid (GC)/oxalic acid (OX) redox couple was enhanced via the multiscale approach, i.e., increase of reaction rate on an anode by employing nanometer-scale (nanoscale) IrO 2 catalysts and increase of selectivity for GC production via optimization of cell structures, i.e., a millimeter-scale approach. We prepared nanoscale IrO 2 anode catalyst, which is mixture of IrO 2 nanoparticles (d = 3.7 ± 1.8 nm) and their agglomerates (d < 200 nm). The linear sweep voltammetry measurement for water oxidation revealed that the nanoscale IrO 2 catalyst deposited on a porous carbon paper reduces overpotential for water oxidation by 196 mV from that obtained with an anode composed of commercial microscale IrO 2 grans. Furthermore, application of the nanoscale IrO 2 catalyst on porous titanium paper not only improved durability but also doubly enhanced water oxidation performance. We examined various PEAEC architectures composed of the nanoscale IrO 2 applied Ti anode. Both nanometer- and millimeter-scale approaches realized the best PEAEC performance for GC production, i.e., 59.4% of energy conversion efficiency with 97.1% of Faradaic efficiency for the GC production at 1.8 V and 98.9% of conversion for 3 M OX, which is an almost saturated aqueous solution at operating temperature of the PEAEC (60 °C).

Original languageEnglish
JournalCatalysis Today
DOIs
Publication statusPublished - Jan 1 2019

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glycolic acid
Electrolytes
Anodes
Polymers
Alcohols
Oxalic Acid
Catalysts
Oxalic acid
Acids
Oxidation
Water
Catalyst selectivity
Voltammetry
Titanium
Energy conversion
Conversion efficiency
Reaction rates
Durability
Carbon
Nanoparticles

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

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title = "Multiscale design for high-performance glycolic acid electro-synthesis cell: Preparation of nanoscale-IrO 2 -applied Ti anode and optimization of cell assembling",
abstract = "Performance of a polymer electrolyte alcohol electrosynthesis cell (PEAEC) using a glycolic acid (GC)/oxalic acid (OX) redox couple was enhanced via the multiscale approach, i.e., increase of reaction rate on an anode by employing nanometer-scale (nanoscale) IrO 2 catalysts and increase of selectivity for GC production via optimization of cell structures, i.e., a millimeter-scale approach. We prepared nanoscale IrO 2 anode catalyst, which is mixture of IrO 2 nanoparticles (d = 3.7 ± 1.8 nm) and their agglomerates (d < 200 nm). The linear sweep voltammetry measurement for water oxidation revealed that the nanoscale IrO 2 catalyst deposited on a porous carbon paper reduces overpotential for water oxidation by 196 mV from that obtained with an anode composed of commercial microscale IrO 2 grans. Furthermore, application of the nanoscale IrO 2 catalyst on porous titanium paper not only improved durability but also doubly enhanced water oxidation performance. We examined various PEAEC architectures composed of the nanoscale IrO 2 applied Ti anode. Both nanometer- and millimeter-scale approaches realized the best PEAEC performance for GC production, i.e., 59.4{\%} of energy conversion efficiency with 97.1{\%} of Faradaic efficiency for the GC production at 1.8 V and 98.9{\%} of conversion for 3 M OX, which is an almost saturated aqueous solution at operating temperature of the PEAEC (60 °C).",
author = "Takashi Fukushima and Manabu Higashi and Sho Kitano and Takeharu Sugiyama and Miho Yamauchi",
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