Operando 3D Visualization of Migration and Degradation of a Platinum Cathode Catalyst in a Polymer Electrolyte Fuel Cell

Matsui, H.; Ishiguro, Nozomu; Uruga, Tomoya; Sekizawa, Oki; Higashi, Kõtarõ; Maejima, Naoyuki; Tada, Mizuki

doi:10.1002/anie.201703940

Cited by 71 publications

(90 citation statements)

References 40 publications

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“…(C) Illustration of CT‐XAFS measurement protocol. 184 data sets ( θ :−80−+80° every 0.1°) were recorded at X‐ray energies around Pt L III ‐edge …”

Section: Operando Computed Tomography (Ct)‐xafs Of Pefc Mea Before Anmentioning

confidence: 99%

“…Operando Pt L III ‐edge CT‐XAFS data of the MEA was collected at 1.0 V after aging and then ADT, which was 20,000 voltage operating cycles between 0.6–1.0 V, was conducted for the MEA. Finally, operando Pt L III ‐edge CT‐XAFS was recorded for the same MEA after the ADT . XCT images with the angle θ range of −80° and +80° at 0.1° intervals (1600 images) were recorded for the MEA with the Pt/C cathode catalyst.…”

Section: Operando Computed Tomography (Ct)‐xafs Of Pefc Mea Before Anmentioning

confidence: 99%

“…(D) Accelerated degradation test (ADT) procedure (left‐axis) and electrochemical surface area (ECSA) versus the number of the ADT cycles (right‐axis). Square and circle plots indicate ECSAs for before and after the CT‐XAFS measurement …”

Section: Operando Computed Tomography (Ct)‐xafs Of Pefc Mea Before Anmentioning

confidence: 99%

“…The utilization of bright hard X‐rays enables the XAFS imaging of cathode catalysts in MEAs under PEFC operating conditions and various events in PEFC MEAs such as cathode catalyst degradation, migration, and reaction kinetics have been investigated . Recently, we reported the operando CT‐XAFS imaging of the cathode catalyst layer with a Pt/C catalyst in an MEA and proposed the degradation mechanism of the Pt cathode catalyst by ADT …”

Section: Introductionmentioning

confidence: 99%

“…In this personal account, our examples of XAFS imaging of PEFC MEAs are highlighted. CT‐XAFS and CL‐XAFS clearly visualized the degradation of Pt/C cathode catalysts in MEAs by ADT . The principle, operando measurements, and analysis of the CT/CL‐XAFS are also introduced.…”

Section: Introductionmentioning

confidence: 99%

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Operando XAFS Imaging of Distribution of Pt Cathode Catalysts in PEFC MEA

Matsui

Maejima

Ishiguro

et al. 2018

The Chemical Record

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Three‐dimensional imaging using X‐ray as a probe is state‐of‐the‐art for the characterization of heterogeneous materials. In addition to simple imaging of sample morphology, imaging of elemental distribution and chemical states provides advanced maps of key structural parameters of functional materials. The combination of X‐ray absorption fine structure (XAFS) spectroscopy and three‐dimensional imaging such as computed tomography (CT) can visualize the three‐dimensional distribution of target elements, their valence states, and local structures in a non‐destructive manner. In this personal account, our recent results on the three‐dimensional XAFS imaging for Pt cathode catalysts in the membrane electrode assembly (MEA) of polymer electrolyte fuel cell (PEFC) are introduced. The distribution and chemical states of Pt cathode catalysts in MEAs remarkably change under PEFC operating conditions, and the 3D XAFS imaging revealed essential events in PEFC MEAs.

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“…(C) Illustration of CT‐XAFS measurement protocol. 184 data sets ( θ :−80−+80° every 0.1°) were recorded at X‐ray energies around Pt L III ‐edge …”

Section: Operando Computed Tomography (Ct)‐xafs Of Pefc Mea Before Anmentioning

confidence: 99%

Section: Operando Computed Tomography (Ct)‐xafs Of Pefc Mea Before Anmentioning

confidence: 99%

Section: Operando Computed Tomography (Ct)‐xafs Of Pefc Mea Before Anmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%