The conductive network optimization of composite graphite plates and its morphological analysis

Fan, Runlin; Zheng, Junsheng; Peng, Yuhang; Chen, Jing; Zhan, Zize; Yao, Dongmei; Zhang, Cunman; Ming, Pingwen

doi:10.1016/j.cej.2022.136652

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…This phenomenon was related to the failure of the resin to fully infiltrate into the graphite plates. Because there were more microporous structures within EGPs, which hindered resin flow and result in the formation of resin deposition layer between EGP and CFF, and the analysis of the microstructure and properties was discussed in detail in the previous study (14). When comparing the conductivity and mechanical properties of CGBPs with different auxiliary fillers, the addition of CNT and GNP significantly improved the conductivity and mechanical properties of CGBPs.…”

Section: Resultsmentioning

confidence: 99%

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(Digital Presentation) Development of Composite Graphite Plate with Multiple Functional Layers for Pemfc

Fan¹,

Zheng²,

Chen³

et al. 2022

ECS Trans.

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The bipolar plate is an important component of the proton exchange membrane fuel cell (PEMFC) and composite graphite bipolar plates (CGBPs) have attracted interest due to competitive benefits. However, their mechanical and electrical qualities are insufficient to meet the PEMFC's standards. In this study, a structural design of CGBPs with different functional layers was proposed. The surface layer was molded graphite plate with resin infiltration treatment, and the middle layer was a carbon fiber fabric (CFF) as a reinforcing functional layer. The results showed that the surface layer prepared from flake graphite possessed denser structure, leading to higher airtightness and structural strength. The addition of carbon nanotube or graphene nanoplate could enhance the combination between CFF and resin observably, making CGBPs possessed an in-plane conductivity of 446 S/cm, an area specific resistance of 6.4 mΩ·cm2, a flexural strength of 72 MPa, and a Helium permeability of around 4.4×10-6 std cm3/cm2·s.

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Section: Resultsmentioning

confidence: 99%

“…The four-probe tester was used to assess in-plane conductivity. The ASR test method and gas permeability test method were introduced in previous work (14).…”

Section: Characterizations Of Cgbpsmentioning

confidence: 99%

(Digital Presentation) Development of Composite Graphite Plate with Multiple Functional Layers for Pemfc

Fan¹,

Zheng²,

Chen³

et al. 2022

ECS Trans.

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“…In fact, since the conductive paths inside the composite bipolar plate are often blocked due to the inhomogeneity of the material and the addition of resin, which will reduce the conductive performance of the composite bipolar plate, Therefore, a reasonable construction of conductive paths to ensure that the conductive paths inside the material are not blocked has also been proven to be an effective method to improve performance [ 17 , 18 , 19 , 20 , 21 ]. For example, Fan [ 22 ] uses the reasonable distribution of flake graphite (FG) and expanding graphite (EG) to construct a conductive path to improve the performance of the composite bipolar plate, and its conductivity can reach up to 332.64 S/cm. Additionally, the addition of conductive fillers can also effectively improve the electrical conductivity of composite bipolar plates [ 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Improved Performance of Composite Bipolar Plates for PEMFC Modified by Homogeneously Dispersed Multi-Walled Carbon Nanotube Networks Prepared by In Situ Chemical Deposition

Xie

Qiu

et al. 2023

Nanomaterials

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Composite bipolar plates with excellent performance play a crucial role in improving the overall performance of proton-exchange-membrane fuel cells. However, for graphite/resin composite bipolar plates, their electrical conductivity and mechanical properties are often too complex to meet the needs of users at the same time. Although nanoconductive fillers can alleviate this problem, the performance improvement for composite bipolar plates is often limited due to problems such as agglomeration. In this study, a uniformly dispersed multi-walled carbon nanotube network was prepared by in situ vapor deposition on the surface and pores of expanded graphite, which effectively avoided the problem of agglomeration and effectively improved the various properties of the composite BPs through the synergistic effect with graphite. With the addition of 2% in situ deposited carbon nanotubes, the modified composite bipolar plate has the best conductivity (334.53 S/cm) and flexural strength (50.24 MPa), and all the properties can meet the DOE requirements in 2025. Using the in situ deposition of carbon nanotubes to modify composite bipolar plates is a feasible route because it can result in multi-walled carbon nanotubes in large quantities and avoid the agglomeration phenomenon caused by adding nanofillers. It can also significantly improve the performance of composite bipolar plates, achieving the high performance of composite bipolar plates at a lower cost.

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“…As an energy source for electric automobiles, PEMFC is advantageous because of its minimal emission of environmental pollutants and higher energy conversion rate. [12][13][14] Electric motors in fuel cell electric vehicles are operated by electricity produced from PEMFC. This system produces only water as a byproduct with high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Proton exchange membrane fuel cell (PEMFC) is a prominent fuel cell for applications in electric vehicles. As an energy source for electric automobiles, PEMFC is advantageous because of its minimal emission of environmental pollutants and higher energy conversion rate 12–14 . Electric motors in fuel cell electric vehicles are operated by electricity produced from PEMFC.…”

Section: Introductionmentioning

confidence: 99%

Development of novel composite bipolar plates using surface‐modified conductive carbon filler materials for polymer electrolyte membrane fuel cells

Mathew,

Mohamed,

Lenin Singaravelu

2023

J of Applied Polymer Sci

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The requirement for a lightweight bipolar plate (BP) for Proton Exchange Membrane Fuel Cell (PEMFC) is increasing to make it feasible to power hydrogen fuel cell electric vehicles. Composite BP with carbon materials as conductive fillers and polymer as the binder are preferable over pure graphite and metallic BP. This study investigates the effect of Surface‐enhanced flake graphite (SEFG) as a novel filler material in composite BP. A composite BP is developed with Epoxy Resin (ER) as the binder and Natural Flake Graphite (NFG), Carbon Black (CB) and SEFG as conductive fillers. Composite BP fabricated with 10 vol% SEFG, 10 vol% CB, and 40 vol% NFG exhibited an electrical conductivity of 158 S cm−1, flexural strength of 38 MPa, water contact angle of 90.410 and corrosion current density of 0.261 μA cm−2. The composite BP also achieved a density of 1.55 g cm−3, water absorption of 0.6% and thermal conductivity of 3.6 W m−1 K−1 at 120°C. These results are highly favorable for BPs used in PEMFC. This paper provides an insight into using surface‐modified conductive carbon filler materials to develop composite BP for application in PEMFC.

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The conductive network optimization of composite graphite plates and its morphological analysis

Cited by 6 publications

References 34 publications

(Digital Presentation) Development of Composite Graphite Plate with Multiple Functional Layers for Pemfc

(Digital Presentation) Development of Composite Graphite Plate with Multiple Functional Layers for Pemfc

Improved Performance of Composite Bipolar Plates for PEMFC Modified by Homogeneously Dispersed Multi-Walled Carbon Nanotube Networks Prepared by In Situ Chemical Deposition

Development of novel composite bipolar plates using surface‐modified conductive carbon filler materials for polymer electrolyte membrane fuel cells

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