Modification of Nafion membrane by Pd-impregnation via electric field

Zhang, Xuelin; Zhang, Yufeng; Nie, Li; Liu, Xiaowei; Chang, Limin

doi:10.1016/j.jpowsour.2012.06.036

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…Generally, there are two different ways to measure the methanol crossover. The first one is to measure the current density of methanol oxidation at the cathode by linear scan voltammetry (LSV), with the limiting current density corresponding to the maximum rate of methanol crossover . However, this method is merely applicable to the methanol crossover under open-circuit condition.…”

Section: Resultsmentioning

confidence: 99%

“…The first one is to measure the current density of methanol oxidation at the cathode by linear scan voltammetry (LSV), with the limiting current density corresponding to the maximum rate of methanol crossover. 38 However, this method is merely applicable to the methanol crossover under open-circuit condition. In this paper, the two cells not only hold the same anode structure but also adopt the same Nafion membrane and cathode Pt loading.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Constructing a Cathode Catalyst Layer of a Passive Direct Methanol Fuel Cell with Highly Hydrophilic Carbon Aerogel for Improved Water Management

Wen

Hou

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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Nitrogen-doped porous carbon materials show excellent water adsorption ability by forming strong hydrogen bonding between water molecules and the doped atoms. When these porous carbon materials are used to construct a water management layer (WML) of a passive direct methanol fuel cell (DMFC), high water concentration and hydraulic pressure formed inside the cathode catalyst layer would facilitate the water recovery from cathode to anode. In this paper, a highly hydrophilic nitrogen-doped carbon aerogel was synthesized by the carbonization of hydrogel precursors composed of resorcinol, formaldehyde, and graphene oxide under ammonia, and it was used for the first time to construct the WML for liquid-feed and vapor-feed passive DMFCs. The results show that the WML significantly improves the output performance of the liquid-feed DMFC by enhancing the water recovery, which is characterized and proved by the smaller cathode polarization, the slightly increased anode polarization, and a released cathode water flooding situation. A new method was also proposed to study the in situ methanol crossover of DMFCs, which confirmed that the methanol crossover during the discharge was reduced by the WML. As for the vapor-feed DMFCs, the WML reduces both the cathode and anode polarizations significantly, which increases the output performance greatly. This study opens a new window for the design and optimization of the membrane assembly electrode of DMFCs.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Constructing a Cathode Catalyst Layer of a Passive Direct Methanol Fuel Cell with Highly Hydrophilic Carbon Aerogel for Improved Water Management

Wen

Hou

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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“…Ostensibly, a shorter and less tortuous conduction pathway in the TP direction would increase the efficiency of proton transport from the anode to the cathode, thereby increasing PEMFC performance. So far, efforts to orient conductivity in the TP direction have been explored by electric field alignment 9–15 and magnetic field alignment 16–20 . Electric field alignment has been explored by incorporating metal 9 or metal oxide 10 , non-solvent-assisted casting 11 , and polymer blends 12–15 , but improvements in both conductivity and fuel cell performance have been modest.…”

Section: Introductionmentioning

confidence: 99%

“…So far, efforts to orient conductivity in the TP direction have been explored by electric field alignment 9–15 and magnetic field alignment 16–20 . Electric field alignment has been explored by incorporating metal 9 or metal oxide 10 , non-solvent-assisted casting 11 , and polymer blends 12–15 , but improvements in both conductivity and fuel cell performance have been modest. In the case of magnetic field alignment, this has been carried out using materials related only to metal oxides, such as pristine metal oxides 16–18 , coated metal oxide 19 , and other filler deposited with metal oxide 20 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane

et al. 2019

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Proton exchange membranes with short-pathway through-plane orientated proton conductivity are highly desirable for use in proton exchange membrane fuel cells. Magnetic field is utilized to create oriented structure in proton exchange membranes. Previously, this has only been carried out by proton nonconductive metal oxide-based fillers. Here, under a strong magnetic field, a proton-conducting paramagnetic complex based on ferrocyanide-coordinated polymer and phosphotungstic acid is used to prepare composite membranes with highly conductive through-plane-aligned proton channels. Gratifyingly, this strategy simultaneously overcomes the high water-solubility of phosphotungstic acid in composite membranes, thereby preventing its leaching and the subsequent loss of membrane conductivity. The ferrocyanide groups in the coordinated polymer, via redox cycle, can continuously consume free radicals, thus helping to improve the long-term in situ membrane durability. The composite membranes exhibit outstanding proton conductivity, fuel cell performance and durability, compared with other types of hydrocarbon membranes and industry standard Nafion® 212.

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Magnetic aligned sulfonated carbon nanotube/Nafion composite membranes with anisotropic mechanical and proton conductive properties

et al. 2021

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Modification of Nafion membrane by Pd-impregnation via electric field

Cited by 10 publications

References 17 publications

Constructing a Cathode Catalyst Layer of a Passive Direct Methanol Fuel Cell with Highly Hydrophilic Carbon Aerogel for Improved Water Management

Constructing a Cathode Catalyst Layer of a Passive Direct Methanol Fuel Cell with Highly Hydrophilic Carbon Aerogel for Improved Water Management

Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane

Magnetic aligned sulfonated carbon nanotube/Nafion composite membranes with anisotropic mechanical and proton conductive properties

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