Characterization of Nafion XL membrane for PEMFC after VUV degradation and titanium nitride coating

Rattanachai, Yuttakarn; Rintramee, Kamolwan; Rattanasuporn, Surachet; Supruangnet, Ratchadaporn

doi:10.1016/j.nimb.2018.10.013

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…It is known that exposure to UV radiation can cause degradation of many polymers, resulting in breaking of polymer chains, production of free radicals, and reduction of the molecular weight. , To investigate the stability of Aquivion and Nafion polymers during prolonged exposure to UV irradiation (LED-365 nm), UV/vis spectroscopy was used. As shown in Figure , the light transmittance for Nafion is heavily affected after 16 h of UV irradiation and a significant drop in the light transmittance, which becomes negligible for wavelengths below 300 nm.…”

Section: Resultsmentioning

confidence: 99%

Solar Hydrogen Generation from Ambient Humidity Using Functionalized Porous Photoanodes

Zafeiropoulos

Johnson

Kinge

et al. 2019

ACS Appl. Mater. Interfaces

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Solar hydrogen is a promising sustainable energy vector, and steady progress has been made in the development of photoelectrochemical (PEC) cells. Most research in this field has focused on using acidic or alkaline liquid electrolytes for ionic transfer. However, the performance is limited by (i) scattering of light and blocking of catalytic sites by gas bubbles and (ii) mass transport limitations. An attractive alternative to a liquid water feedstock is to use the water vapor present as humidity in ambient air, which has been demonstrated to mitigate the above problems and can expand the geographical range where these devices can be utilized. Here, we show how the functionalization of porous TiO 2 and WO 3 photoanodes with solid electrolytesproton conducting Aquivion and Nafion ionomersenables the capture of water from ambient air and allows subsequent PEC hydrogen production. The optimization strategy of photoanode functionalization was examined through testing the effect of ionomer loading and the ionomer composition. Optimized functionalized photoanodes operating at 60% relative humidity (RH) and T cell = 30−70 °C were able to recover up to 90% of the performance obtained at 1.23 V versus reverse hydrogen electrode (RHE) when water is introduced in the liquid phase (i.e., conventional PEC operation). Full performance recovery is achieved at a higher applied potential. In addition, long-term experiments have shown remarkable stability at 60% RH for 64 h of cycling (8 h continuous illumination−8 h dark), demonstrating that the concept can be applicable outdoors.

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Section: Resultsmentioning

confidence: 99%

Solar Hydrogen Generation from Ambient Humidity Using Functionalized Porous Photoanodes

Zafeiropoulos

Johnson

Kinge

et al. 2019

ACS Appl. Mater. Interfaces

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“…They can be easily designed according to the favorable properties for fuel cell applications. Typical examples of hydrocarbon polymers used as PEMs are sulfonated poly ether-ether ketone, polyarylene, polysulfone and polyimides [7][8][9]. They are cost-effective than fluorinecontaining based polymers.…”

Section: Introductionmentioning

confidence: 99%

Composite Proton Electrolyte Membranes C Poly Ether-Ether Ketone (SPEEK) at Various Amount of Mesoporous Phosphotungstic Acid (mPTA) for Hydrogen Fuel Cell Application

Mehanathan

Mohamed

Jaafar

et al. 2020

AMST

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Polymer electrolyte membrane fuel cells (PEMFC), also known as proton exchange membrane fuel cells utilise polymer electrolyte membranes (PEMs) to conduct protons for ion-exchange purposes. Nafion is a common polymeric material to be used as PEM for fuel cells. However, Nafion has major weaknesses such as low proton conductivity under anhydrous conditions at elevated temperatures due to water evaporation and continuous need for water management, low tolerance for fuel impurities and high cost. This study fabricates a newly composite PEM by blending SPEEK and mesoporous phosphotungstic acid (mPTA) at various loading in order to obtain the most favourable PEMFC power output. SP/2.0mPTA membrane has shown outstanding properties in terms of dense structure, 35.75% of water uptake and expected an elemental mapping of 76.20% Tungsten and 23.80% Phosphorus. Even with a lower proton conductivity of 3.502 mScm-1, this membrane has a higher power density of 154.4 mW/cm2 compared to the other four membranes. Owing to the unique characteristics of the as-synthesized mPTA such as high surface area, porous structure, good thermal and chemical resistance, SPEEK-mPTA membrane is one of the promising materials for PEMFC applications.

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Investigation on degradation mechanism of hydrogen–oxygen proton exchange membrane fuel cell under current cyclic loading

Meng

Chen

Zhou

et al. 2022

Energy

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Characterization of Nafion XL membrane for PEMFC after VUV degradation and titanium nitride coating

Cited by 5 publications

References 35 publications

Solar Hydrogen Generation from Ambient Humidity Using Functionalized Porous Photoanodes

Solar Hydrogen Generation from Ambient Humidity Using Functionalized Porous Photoanodes

Composite Proton Electrolyte Membranes C Poly Ether-Ether Ketone (SPEEK) at Various Amount of Mesoporous Phosphotungstic Acid (mPTA) for Hydrogen Fuel Cell Application

Investigation on degradation mechanism of hydrogen–oxygen proton exchange membrane fuel cell under current cyclic loading

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