Elucidation of oxygen reduction reaction and nanostructure of platinum-loaded graphene mesosponge for polymer electrolyte fuel cell electrocatalyst

Ohma, Atsushi; Furuya, Yoshihisa; Mashio, Tetsuya; Ito, Masashi; Nomura, Keita; Nagao, Tomohiko; Nishihara, Hirotomo; Jinnai, Hiroshi; Kyotani, Takashi

doi:10.1016/j.electacta.2020.137705

Cited by 19 publications

(12 citation statements)

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“…Due to differences in pore structure and surface hydrophilicity, the ORR polarization curves showed the corresponding electrochemically active surface area (ECSA) as Pt/HSAC (69.3 m 2 /g) > Pt/Vulcan XC-72 (55.1 m 2 /g) > Pt/LSAC (46.9 m 2 /g) at same Pt loading. Very recently, Ohma et al compared Pt loading on graphene meso-sponge (GMS) and commercially available Ketjen black (KB) ( Ohma et al, 2021 ). The ORR activity of Pt/GMS was found to be 1.2 times higher than Pt/KB.…”

Section: D Electron Tomography For Electrocatalysts At Nanoscalementioning

confidence: 99%

Recent Progress on Revealing 3D Structure of Electrocatalysts Using Advanced 3D Electron Tomography: A Mini Review

Wang

2022

Front. Chem.

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Electrocatalysis plays a key role in clean energy innovation. In order to design more efficient, durable and selective electrocatalysts, a thorough understanding of the unique link between 3D structures and properties is essential yet challenging. Advanced 3D electron tomography offers an effective approach to reveal 3D structures by transmission electron microscopy. This mini-review summarizes recent progress on revealing 3D structures of electrocatalysts using 3D electron tomography. 3D electron tomography at nanoscale and atomic scale are discussed, respectively, where morphology, composition, porous structure, surface crystallography and atomic distribution can be revealed and correlated to the performance of electrocatalysts. (Quasi) in-situ 3D electron tomography is further discussed with particular focus on its impact on electrocatalysts’ durability investigation and post-treatment. Finally, perspectives on future developments of 3D electron tomography for eletrocatalysis is discussed.

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Section: D Electron Tomography For Electrocatalysts At Nanoscalementioning

confidence: 99%

Recent Progress on Revealing 3D Structure of Electrocatalysts Using Advanced 3D Electron Tomography: A Mini Review

Wang

2022

Front. Chem.

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“…The evaluation of the graphene edge sites was performed by measuring the amount of desorbed gas from a sample using an in-house temperature-programmed desorption (TPD) device at temperatures up to 1800 °C under vacuum. [51][52][53][54][55] The bulk modulus of the samples were obtained by a mercury-intrusion technique. 41,43 Specifically, the volume change Δ𝑉 is measured when the sample is placed in a vacuum chamber and isotropically compressed by mercury.…”

Section: Characterizationmentioning

confidence: 99%

“…In this study, we attempt to control the pore size of soft mesoporous carbon, carbon mesosponge (CMS), consisting of a single-layer graphene wall from 7.36 to 2.14 nm by mechanical hot-pressing. 49,50 CMS has been synthesized as a precursor to graphene mesosponge (GMS), a new carbon material with both high specific surface area and high durability, and is a candidate material for high-voltage supercapacitors, 51 fuel cells, 52 and catalyst supports. 53 Moreover, GMS is mechanically flexible owing to its monolayer graphene walls, while its pore size can be reversibly controlled by the application of mechanical pressure.…”

Section: Introductionmentioning

confidence: 99%

Pore-size control of soft mesoporous carbon by hot pressing

et al. 2022

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As a facile post-synthesis approach for mesopore-size control of nanoporous carbon, we propose mechanical pressing of soft mesoporous carbons at 600 °C, namely hot pressing. Although conventional nanoporous carbons are mechanically hard and brittle, carbon mesosponge (CMS) which consists mainly of rarely stacked graphene walls is exceptionally soft, which is proved by its record small bulk modulus of 0.084 GPa. Thus, its mesopores with an average pore size of 7.36 nm can be further contracted by applying small mechanical pressures of only 10 MPa. Interestingly, the specific surface area and pore volumes of CMS increase on the application of relatively small mechanical pressure (< 20 MPa). This is ascribed to the exfoliation of weakly stacked graphene structures generated during the CMS synthesis process. Moreover, the average mesopore size of CMS can be finely tuned to the micropore scale as small as 2.14 nm under carefully adjusted mechanical pressure. Here we report the structural changes that occur upon hot-pressing focusing on the CMS crystallinity, graphene edge sites, and the framework flexibility. Although the CMS framework becomes harder on the application of mechanical force, CMS still retains its low bulk modulus, which is comparable to graphene mesosponge, known as a very soft carbon material. Thus, hot pressing of CMS provides a facile method to fabricate soft and elastic mesoporous carbons with controllable mesopore sizes between 2.14 to 7.36 nm.

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“…Recently, highly mesoporous carbons consisting of a few-layer graphene wall have attracted interest for various applications, including supercapacitors, 17 high-capacity adsorbents, 18 new types of heat pumps, 19 lithium-sulfur batteries, 20 catalyst supports, 21 polymer-electrolyte fuel cells, 22 and lithium-oxygen batteries. 23,24 It has been reported that such specific mesoporous carbons show almost no structural change up to 2073 K, where graphene-zipping reactions take place to improve the electric conductivity and chemical stability of the carbon framework.…”

Section: Introductionmentioning

confidence: 99%

Chemistry of zipping reactions in mesoporous carbon consisting of minimally stacked graphene layers

et al. 2023

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Elucidation of oxygen reduction reaction and nanostructure of platinum-loaded graphene mesosponge for polymer electrolyte fuel cell electrocatalyst

Cited by 19 publications

References 50 publications

Recent Progress on Revealing 3D Structure of Electrocatalysts Using Advanced 3D Electron Tomography: A Mini Review

Recent Progress on Revealing 3D Structure of Electrocatalysts Using Advanced 3D Electron Tomography: A Mini Review

Pore-size control of soft mesoporous carbon by hot pressing

Chemistry of zipping reactions in mesoporous carbon consisting of minimally stacked graphene layers

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