Tuning hydrophobic-hydrophilic balance of cathode catalyst layer to improve cell performance of proton exchange membrane fuel cell (PEMFC) by mixing polytetrafluoroethylene (PTFE)

The wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer influences the performance of the proton exchange membrane fuel cell. In this paper, cathode catalyst layer with different polytetrafluoroethylene contents are prepared, and the effect of hydrophobic-hydrophilic balance o...

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Veröffentlicht in:	Electrochimica acta Jg. 277; S. 110 - 115
Hauptverfasser:	Chi, Bin, Hou, Sanying, Liu, Guangzhi, Deng, Yijie, Zeng, Jianghuang, Song, Huiyu, Liao, Shijun, Ren, Jianwei
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Oxford Elsevier Ltd 01.07.2018 Elsevier BV
Schlagworte:	Assembly Catalysis Catalysts Cathode catalyst layer Cathodes Current density Electrodes Fuel cells High performance Hydrophobic surfaces Hydrophobicity Maximum power density Membrane electrode assembly Membrane separation Polytetrafluoroethylene Proton exchange membrane fuel cell Proton exchange membrane fuel cells Protons Water conservation Water management Wettability High performance Polytetrafluoroethylene Proton exchange membrane fuel cell Water management Membrane electrode assembly Cathode catalyst layer
ISSN:	0013-4686, 1873-3859
Online-Zugang:	Volltext
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Abstract	The wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer influences the performance of the proton exchange membrane fuel cell. In this paper, cathode catalyst layer with different polytetrafluoroethylene contents are prepared, and the effect of hydrophobic-hydrophilic balance on the performance of the membrane electrode assembly is investigated intensively. It is found that wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer can significantly affect the performance of membrane electrode assembly, and it can be effectively tuned by varying the loading of polytetrafluoroethylene. With the addition of polytetrafluoroethylene, the hydrophobicity of cathode catalyst layer, reflected by the contact angel, can be changed from 135.6° of that without addition of polytetrafluoroethylene to 146.5° with 70 wt.% polytetrafluoroethylene addition, and the optimal addition amount is 50 wt.%. For our optimal membrane electrode assembly with optimal addition of polytetrafluoroethylene in cathode, its current density are recorded as 990 mA cm–2 at 0.7 V and 1400 mA cm–2 at 0.6 V, respectively; its maximum power density is up to 856 mW cm−2. Furthermore, our polytetrafluoroethylene-incorporated membrane electrode assembly also exhibits excellent stability, and current density only drops from 1000 mA cm−2 to 900 mA cm−2 after a continuous operation of 60 h. A series of MEAs with hydrophobic cathode catalyst layer was successfully prepared using a spraying method by adding PTFE into the cathode catalyst layer ink. Our optimal MEA, MEA-PT50, its current density were recorded as 990 mA cm-2 at 0.7 V and 1400 mA cm-2 at 0.6 V, respectively; its maximum power density is up to 856 mW cm−2, which is much higher than that of the MEA without addition of PTFE (711 mW cm−2). Furthermore, our MEA-PT50 also exhibits excellent stability, and the current density only dropped from 1000 mA cm−2 to 90 0 mA cm−2 after a continuous operation of 60 h, for the MEA without addition of PTFE, it dropped from 1000 mA cm−2 to 770 mA cm−2 in the same duration and same conditions. [Display omitted] •The performance of MEA can be improved by adding PTFE in cathode catalyst layer.•The current density of MEA with adding PTFE could be up to 990 mA cm-2 at 0.7 V.•The maximum power density of our MEA is 20% higher than that of non PTFE MEA.•The MEA exhibits excellent stability, with current dropping of less 10% in 60 h.•The hydrophobic/hydrophilic balance of the MEA can be adjusted by adding PTFE.
AbstractList	The wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer influences the performance of the proton exchange membrane fuel cell. In this paper, cathode catalyst layer with different polytetrafluoroethylene contents are prepared, and the effect of hydrophobic-hydrophilic balance on the performance of the membrane electrode assembly is investigated intensively. It is found that wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer can significantly affect the performance of membrane electrode assembly, and it can be effectively tuned by varying the loading of polytetrafluoroethylene. With the addition of polytetrafluoroethylene, the hydrophobicity of cathode catalyst layer, reflected by the contact angel, can be changed from 135.6° of that without addition of polytetrafluoroethylene to 146.5° with 70 wt.% polytetrafluoroethylene addition, and the optimal addition amount is 50 wt.%. For our optimal membrane electrode assembly with optimal addition of polytetrafluoroethylene in cathode, its current density are recorded as 990 mA cm–2 at 0.7 V and 1400 mA cm–2 at 0.6 V, respectively; its maximum power density is up to 856 mW cm−2. Furthermore, our polytetrafluoroethylene-incorporated membrane electrode assembly also exhibits excellent stability, and current density only drops from 1000 mA cm−2 to 900 mA cm−2 after a continuous operation of 60 h. The wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer influences the performance of the proton exchange membrane fuel cell. In this paper, cathode catalyst layer with different polytetrafluoroethylene contents are prepared, and the effect of hydrophobic-hydrophilic balance on the performance of the membrane electrode assembly is investigated intensively. It is found that wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer can significantly affect the performance of membrane electrode assembly, and it can be effectively tuned by varying the loading of polytetrafluoroethylene. With the addition of polytetrafluoroethylene, the hydrophobicity of cathode catalyst layer, reflected by the contact angel, can be changed from 135.6° of that without addition of polytetrafluoroethylene to 146.5° with 70 wt.% polytetrafluoroethylene addition, and the optimal addition amount is 50 wt.%. For our optimal membrane electrode assembly with optimal addition of polytetrafluoroethylene in cathode, its current density are recorded as 990 mA cm–2 at 0.7 V and 1400 mA cm–2 at 0.6 V, respectively; its maximum power density is up to 856 mW cm−2. Furthermore, our polytetrafluoroethylene-incorporated membrane electrode assembly also exhibits excellent stability, and current density only drops from 1000 mA cm−2 to 900 mA cm−2 after a continuous operation of 60 h. A series of MEAs with hydrophobic cathode catalyst layer was successfully prepared using a spraying method by adding PTFE into the cathode catalyst layer ink. Our optimal MEA, MEA-PT50, its current density were recorded as 990 mA cm-2 at 0.7 V and 1400 mA cm-2 at 0.6 V, respectively; its maximum power density is up to 856 mW cm−2, which is much higher than that of the MEA without addition of PTFE (711 mW cm−2). Furthermore, our MEA-PT50 also exhibits excellent stability, and the current density only dropped from 1000 mA cm−2 to 90 0 mA cm−2 after a continuous operation of 60 h, for the MEA without addition of PTFE, it dropped from 1000 mA cm−2 to 770 mA cm−2 in the same duration and same conditions. [Display omitted] •The performance of MEA can be improved by adding PTFE in cathode catalyst layer.•The current density of MEA with adding PTFE could be up to 990 mA cm-2 at 0.7 V.•The maximum power density of our MEA is 20% higher than that of non PTFE MEA.•The MEA exhibits excellent stability, with current dropping of less 10% in 60 h.•The hydrophobic/hydrophilic balance of the MEA can be adjusted by adding PTFE.
Author	Chi, Bin Zeng, Jianghuang Deng, Yijie Song, Huiyu Hou, Sanying Liu, Guangzhi Liao, Shijun Ren, Jianwei
Author_xml	– sequence: 1 givenname: Bin surname: Chi fullname: Chi, Bin organization: The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China – sequence: 2 givenname: Sanying surname: Hou fullname: Hou, Sanying organization: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, 421001, China – sequence: 3 givenname: Guangzhi surname: Liu fullname: Liu, Guangzhi organization: The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China – sequence: 4 givenname: Yijie surname: Deng fullname: Deng, Yijie organization: The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China – sequence: 5 givenname: Jianghuang surname: Zeng fullname: Zeng, Jianghuang organization: The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China – sequence: 6 givenname: Huiyu surname: Song fullname: Song, Huiyu organization: The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China – sequence: 7 givenname: Shijun surname: Liao fullname: Liao, Shijun email: chsjliao@scut.edu.cn organization: The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China – sequence: 8 givenname: Jianwei surname: Ren fullname: Ren, Jianwei organization: Materials Science and Manufacturing (MSM), Council for Scientific and Industrial Research (CSIR), PO Box 395, Pretoria, 0001, South Africa
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Keywords	High performance Polytetrafluoroethylene Proton exchange membrane fuel cell Water management Membrane electrode assembly Cathode catalyst layer
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Snippet	The wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer influences the performance of the proton exchange membrane fuel cell. In this...
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SubjectTerms	Assembly Catalysis Catalysts Cathode catalyst layer Cathodes Current density Electrodes Fuel cells High performance Hydrophobic surfaces Hydrophobicity Maximum power density Membrane electrode assembly Membrane separation Polytetrafluoroethylene Proton exchange membrane fuel cell Proton exchange membrane fuel cells Protons Water conservation Water management Wettability
Title	Tuning hydrophobic-hydrophilic balance of cathode catalyst layer to improve cell performance of proton exchange membrane fuel cell (PEMFC) by mixing polytetrafluoroethylene (PTFE)
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