Carbon-supported ultrafine Pt nanoparticles modified with trace amounts of cobalt as enhanced oxygen reduction reaction catalysts for proton exchange membrane fuel cells

Tang, Xuejun; Fang, Daqing; Qu, Lili; Xu, Dongyan; Qin, Xiaoping; Qin, Bowen; Song, Wei; Shao, Zhigang; Yi, Baolian

doi:10.1016/s1872-2067(19)63304-8

Cited by 39 publications

(32 citation statements)

References 59 publications

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“…As shown in Figure , the as-prepared catalysts show an obvious face-centered cubic (fcc) structure. A slight peak at approximately 25° is observed in all samples, and this peak belongs to the C (002) plane . For Pt/C, the diffraction peaks at 39.76°, 46.24°, and 67.45° correspond to the Pt (111), Pt (200), and Pt (220) planes .…”

Section: Resultsmentioning

confidence: 82%

High-Loading Pt–Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au Modification

Wang

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Carbon-supported Pt–Co (Pt–Co/C) nanoparticles with a high Pt loading are regarded as promising cathode catalysts for practical applications of proton exchange membrane fuel cells (PEMFCs). Unfortunately, with high loading, it is difficult to improve the catalytic durability while maintaining the particle size between 2 and 5 nm to ensure the initial catalytic activity. Thus, it is of great significance to prepare high-loading Pt–Co/C catalysts with enhanced activity and durability. Herein, we proposed an efficient way to prepare high-Pt-loading (>50 wt %) Pt–Co/C catalysts without using any further surfactants. Furthermore, due to the one-step selective acid etching and surface Au modification, the as-prepared catalysts only need to undergo thermal treatment at as low as 150 °C to achieve a surface structure rich of Pt and Au. The average particle size of the as-prepared Au–Pt–Co/C-0.015 is 3.42 nm, and the Pt loading of it is up to 50.2 wt %. The atomic ratio of Pt, Co, and Au is 94:5:1. The mass activity (MA) is nearly 1.9 times that of Pt/C (60 wt %, JM) and the specific activity is also improved. The MA loss after the 30,000-cycle accelerated degradation test (ADT) is only 9.4%. The remarkable durability is mainly due to the surface Au modification, which can restrict the dissolution of Pt and Co. This research provides an effective synthesis strategy to prepare high-loading carbon-supported Pt-based catalysts beneficial to practical PEMFC applications.

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Section: Resultsmentioning

confidence: 82%

High-Loading Pt–Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au Modification

Wang

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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“…This shift is a sign of the lattice contraction, confirming the formation of Pt‐Co alloy in the Pt‐Co/VACNTs sample. [ 30,31 ] The peak at 2‐theta of ~26° is the characteristic diffraction peak of carbon nanotubes. It should be mentioned that the weak triple peaks located between 2‐theta of 43°–46° belong to the iron carbides wrapped inside the carbon layers, which are chemically stable and extremely hard to be removed.…”

Section: Resultsmentioning

confidence: 99%

A Highly Ordered Hydrophilic–Hydrophobic Janus Bi‐Functional Layer with Ultralow Pt Loading and Fast Gas/Water Transport for Fuel Cells

Meng

Deng

Zhou

et al. 2020

Energy & Environ Materials

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One of the critical challenges that limit broad commercialization of proton exchange membrane fuel cells (PEMFC) is to reduce the usage of Pt while maintaining high power output and sufficient durability. Herein, a novel bi‐functional layer consisting of vertically aligned carbon nanotubes (VACNTs) and nanoparticles of Pt‐Co catalysts (Pt‐Co/VACNTs) is reported for high‐performance PEMFCs. Readily prepared by a two‐step process, the Pt‐Co/VACNTs layer with a hydrophilic catalyst‐loaded side and a hydrophobic gas diffusion side enables a PTFE‐free electrode structure with fully exposed catalyst active sites and superior gas–water diffusion capability. When tested in a PEMFC, the bi‐functional Pt‐Co/VACNTs layer with ultralow Pt loading (~65 μgcathode cm−2) demonstrates a power density of 19.5 kW gPt cathode−1 at 0.6 V, more than seven times that of a cell with commercial Pt/C catalyst (2.7 kW gPt cathode−1 at 0.6 V) at a loading of 400 μgcathode cm−2 tested under similar conditions. This remarkable design of VACNTs‐based catalyst with dual functionalities enables much lower Pt loading, faster mass transport, and higher electrochemical performance and stability. Further, the preparation procedure can be easily scaled up for low‐cost fabrication and commercialization.

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“…Proton exchange membrane fuel cells (PEMFCs) are currently one of the most popular new energy devices, possessing the advantages of quick start-up owing to their low working temperature, compactness, no corrosion problems, and flexibility in any orientation [1,2]. In this operational system, either hydrogen, methanol (direct methanol fuel cells, DMFCs), or ethanol (direct ethanol fuel cells, DEFCs) can be directly used as the fuel.…”

Section: Introductionmentioning

confidence: 99%

“…Under the 2e -reaction mechanism, O2 is first reduced to produce H2O2, and then further reduced to H2O (Eqs. (1,2)), while under the 4e -reaction mechanism, O2 is directly reduced to H2O without H2O2 (Eq. (3)) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Recent developments of nanocarbon based supports for PEMFCs electrocatalysts

Chen

Song

et al. 2021

Chinese Journal of Catalysis

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Carbon-supported ultrafine Pt nanoparticles modified with trace amounts of cobalt as enhanced oxygen reduction reaction catalysts for proton exchange membrane fuel cells

Cited by 39 publications

References 59 publications

High-Loading Pt–Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au Modification

High-Loading Pt–Co/C Catalyst with Enhanced Durability toward the Oxygen Reduction Reaction through Surface Au Modification

A Highly Ordered Hydrophilic–Hydrophobic Janus Bi‐Functional Layer with Ultralow Pt Loading and Fast Gas/Water Transport for Fuel Cells

Recent developments of nanocarbon based supports for PEMFCs electrocatalysts

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