Metal-Oxide-Supported Ir-Decorated Electrocatalysts for Polymer Electrolyte Membrane Water Electrolysis

Yasutake, Masahiro; Anai, Hiroki; Kawachino, Daiki; Noda, Zhiyun; Matsuda, Junko; Ito, Kohei; Hayashi, Akari; Sasaki, Kazunari

doi:10.1149/08613.0673ecst

Cited by 7 publications

(17 citation statements)

References 9 publications

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“…Furthermore, titanium oxide nanostructures with relatively large surface area can be created on the surface of titanium via etching in NaOH. [50][51][52][53] As such utilizing surface oxidation of titanium GDLs is a potentially interesting approach for the creation of novel electrodes for PEMWE cells. Novel gas diffusion electrodes for PEFCs and PEMWE cells have previously been developed, combining e.g.…”

mentioning

confidence: 99%

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO₂ Surfaces Decorated with Ir Electrocatalysts

Yasutake

Kawachino

Noda

et al. 2020

J. Electrochem. Soc.

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Novel catalyst-integrated gas diffusion electrodes (GDEs) for polymer electrolyte membrane water electrolysis (PEMWE) cells are presented, in which porous titanium microfiber sheets are etched in NaOH to generate a nanostructured TiO2 surface, followed by arc plasma deposition (APD) of iridium nanoparticles. The porous titanium sheet acts as a gas diffusion layer (GDL); the nanostructured TiO2 surface acts as a catalyst support with large surface area; and the iridium nanoparticles act as the electrocatalyst. The performance of these unique GDEs in PEMWE cells was optimized by etching in different NaOH concentrations to vary the nanostructure of the TiO2; and by varying the Ir loading via the number of APD pulses. The current-voltage characteristics and the durability of the optimized GDEs were comparable to those reported in the literature using conventional Ir-based electrocatalysts, and electrolysis was achieved with current density up to 5 A cm−2. The main advantages of this catalyst-integrated GDE include the very low iridium loading (i.e. around 0.1 mg cm−2, or just one-tenth of the loading typically used in conventional PEMWEs); high electrolysis current density; the fabrication of stacks with fewer components; and the fabrications of thinner stacks. This could ultimately lead to smaller and lower cost PEMWE systems.

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confidence: 99%

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO₂ Surfaces Decorated with Ir Electrocatalysts

Yasutake

Kawachino

Noda

et al. 2020

J. Electrochem. Soc.

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“…Pt-oxide support interaction by X-ray photoelectron spectroscopy (XPS) analysis; changes in MEA conductivity before and after voltage cycling by impedance spectroscopy; and fingerprints of elements including Pt before and after voltage cycling. Besides Pt-decorated SnO 2 -supported PEFC electrocatalysts discussed in this study, such detailed durability studies on potential cycling are also needed for various oxide-based electrocatalysts [57][58][59][60][61] including: e.g. oxide-core Pt-shell electrocatalysts, 57 carbon-free all-in-one electrodes using porous Ti sheets, 58 Pt-decorated oxide/MPL/GDL-supported MEAs, 59 carbonfree SnO 2 -supported electrocatalysts 22,23,61 for PEFCs, as well as metal-oxide-supported electrocatalysts for polymer electrolyte membrane water electrolysis.…”

Section: Load Cycle Durability Of Meas-formentioning

confidence: 99%

“…oxide-core Pt-shell electrocatalysts, 57 carbon-free all-in-one electrodes using porous Ti sheets, 58 Pt-decorated oxide/MPL/GDL-supported MEAs, 59 carbonfree SnO 2 -supported electrocatalysts 22,23,61 for PEFCs, as well as metal-oxide-supported electrocatalysts for polymer electrolyte membrane water electrolysis. 60 Detailed microstructural analyses should be combined if degradation of such electrocatalyst layers is associated with microstructural/nanostructural changes. [62][63][64][65] Further increase in…”

Section: Load Cycle Durability Of Meas-formentioning

confidence: 99%

PEFC Electrocatalysts Supported on Nb-SnO₂for MEAs with High Activity and Durability: Part I. Application of Different Carbon Fillers

Nakazato

Kawachino

Noda

et al. 2018

J. Electrochem. Soc.

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Currently, carbon black is widely used as an electrocatalyst support for polymer electrolyte fuel cells (PEFCs). However, electrochemical oxidation leads to degradation of this material. In contrast, tin oxide (SnO 2 ) is electrochemically stable even under strongly acidic conditions, and relatively high electronic conductivity can be achieved by doping with niobium (Nb-SnO 2 ), compared with other metal oxides. In this study, Nb-SnO 2 is composited with various conductive carbon fillers, including vapor-grown carbon fibers (VGCF), carbon nanotubes (CNT), and graphitized carbon black (GCB), followed by platinum nanoparticle decoration. These nanocomposite electrocatalysts are incorporated into membrane electrode assemblies (MEAs) and tested under PEFC operational conditions. The resulting fuel cells achieve high initial I-V performance up to 0.742 V at 0.2 A cm −2 (80 • C), as well as excellent cycling durability. In particular, MEAs fabricated with Pt/Nb-SnO 2 /VGCF cathode electrocatalysts exhibit remarkable durability, with only a 12.1% drop in cell voltage at 0.2 A cm −2 over 60,000 start-stop cycles, and a 42.9% drop over 400,000 load potential cycles, corresponding to the lifetime of a fuel cell vehicle (FCV). Platinum-decorated metal oxide electrocatalysts can simultaneously realize high catalytic activity and extended durability, not only in ex-situ half-cell measurements, but also in full cell conditions.

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“…3 One successful approach improving performance in lowloaded anodes was to introduce metallic Ti 4 or TiO x (ref. 5) as a support material in the CL. Moreover, introducing an interlayer, e.g.…”

Section: Introductionmentioning

confidence: 99%

Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder

et al. 2020

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Metal-Oxide-Supported Ir-Decorated Electrocatalysts for Polymer Electrolyte Membrane Water Electrolysis

Cited by 7 publications

References 9 publications

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO₂ Surfaces Decorated with Ir Electrocatalysts

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO₂ Surfaces Decorated with Ir Electrocatalysts

PEFC Electrocatalysts Supported on Nb-SnO₂for MEAs with High Activity and Durability: Part I. Application of Different Carbon Fillers

Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder

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Metal-Oxide-Supported Ir-Decorated Electrocatalysts for Polymer Electrolyte Membrane Water Electrolysis

Cited by 7 publications

References 9 publications

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO2 Surfaces Decorated with Ir Electrocatalysts

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO2 Surfaces Decorated with Ir Electrocatalysts

PEFC Electrocatalysts Supported on Nb-SnO2for MEAs with High Activity and Durability: Part I. Application of Different Carbon Fillers

Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder

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Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO₂ Surfaces Decorated with Ir Electrocatalysts

Catalyst-Integrated Gas Diffusion Electrodes for Polymer Electrolyte Membrane Water Electrolysis: Porous Titanium Sheets with Nanostructured TiO₂ Surfaces Decorated with Ir Electrocatalysts

PEFC Electrocatalysts Supported on Nb-SnO₂for MEAs with High Activity and Durability: Part I. Application of Different Carbon Fillers