Preparation of KOH‐doped PVA/PSSA Solid Polymer Electrolyte for DMFC: The Influence of TiO<sub>2</sub> and PVP on Performance of Membranes

Oliveira, Ariadne Helena Pequeno de; Nascimento, Márcio Luis Ferreira

doi:10.1002/fuce.201500199

Cited by 16 publications

(11 citation statements)

References 30 publications

(33 reference statements)

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“…However, there are several disadvantages including methanol crossover through the electrolyte membrane, which poisons the catalyst (Pt) due to CO species formation [ 7 ]. Many researchers used alkaline anion-exchange membranes (AEMs) for direct methanol alkaline fuel cells (DMAFCs) to overcome these obstacles [ 8 , 9 ]. In AEMs, the charge carriers are OH − ions rather than H + ions, thus they work under alkaline conditions where the electrochemical reactions are more facile than those in acidic medium [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Zeolite-Loaded Polyvinyl Alcohol Composite Membranes for Alkaline Fuel-Cell Electrolytes

Hsu

Kumar

et al. 2018

Polymers

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Having a secure and stable energy supply is a top priority for the global community. Fuel-cell technology is recognized as a promising electrical energy generation system for the twenty-first century. Polyvinyl alcohol/zeolitic imidazolate framework-8 (PVA/ZIF-8) composite membranes were successfully prepared in this work from direct ZIF-8 suspension solution (0–45.4 wt %) and PVA mixing to prevent filler aggregation for direct methanol alkaline fuel cells (DMAFCs). The ZIF-8 fillers were chosen for the appropriate cavity size as a screening aid to allow water and suppress methanol transport. Increased ionic conductivities and suppressed methanol permeabilities were achieved for the PVA/40.5% ZIF-8 composites, compared to other samples. A high power density of 173.2 mW cm−2 was achieved using a KOH-doped PVA/40.5% ZIF-8 membrane in a DMAFC at 60 °C with 1–2 mg cm−2 catalyst loads. As the filler content was raised beyond 45.4 wt %, adverse effects resulted and the DMAFC performance (144.9 mW cm−2) was not improved further. Therefore, the optimal ZIF-8 content was approximately 40.5 wt % in the polymeric matrix. The specific power output was higher (58 mW mg−1) than most membranes reported in the literature (3–18 mW mg−1).

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Section: Introductionmentioning

confidence: 99%

Highly Zeolite-Loaded Polyvinyl Alcohol Composite Membranes for Alkaline Fuel-Cell Electrolytes

Hsu

Kumar

et al. 2018

Polymers

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“…One is ion‐trapping induced deterioration in the active layer that can be addressed by constant‐current‐driven detrapping after prolonged operation . The second is related to the segmental motion of the polymer chains coupled with the movement of the contained ion species . It is intuitive that this second type would be prevalent for the heavy‐duty switching.…”

Section: Introductionmentioning

confidence: 99%

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ganesh

Deb

2017

Adv Materials Inter

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challenging mainly because of their lower ionic conductivity and high relaxation period. In mono-electrochrome (i.e., with a single active EC layer) ECD configurations, an ion-conducting SPE is sandwiched between two transparent conducting oxide coated glass, one of which is laminated with the functional coating. The working mechanism of the ECDs resembles a thin film electrochemical cell, prompting contemporary EC researchers to explore the possibility of integrating ECDs with other electrochemical energy storage devices such as batteries, [2,3] supercapacitors, [4][5][6] and pseudocapacitors. [7,8] Yang et al. [9] published an excellent review that outlines potential impact areas of these efforts. Tian et al. [10] reported the manufacturing of a W 18 O 49 /polyaniline (PANI) based energy level indicating smart supercapacitor electrode that displayed continuous color variations as a response to changing levels of stored energy. Very recently, an ultrafast-charging, high-capacity Al-tungsten oxide based electrochromic battery has been demonstrated by Zhao et al. [11] that showed a sevenfold enhancement in the discharge capacity compared to the other reported works.One substantial challenge in integrating these technologies resides in their mismatched operational requirements. Abruña et al. [12] critically described these differences by noting that the electrolytes are typically the weak-links as many electrochemical systems often push the thermodynamic stability limit for the electrolytes. Additionally, while the ECDs and batteries are designed specifically for a longer storage life, the capacitive charge storage devices require very high cycling efficiency. In a review article, Yang et al. [9] described the challenges in fabricating electrochromic energy system for simultaneous realization of electrochromism and energy storage. They pointed out that high quality ECDs are required to produce a faster and higher response in the optical density against a low charge density. However, batteries or supercapacitors must show a high charge density that significantly compromises the performance of an integrated device. In one section of their review article, Varzi et al. [13] highlighted the challenges associated with charge and mass transport in the Li + containing solid polymer electrolytes for batteries. The discussion is relevant for constructing ECDs as well for Li + ion based systems that offer more stability than an acidic system. A comprehensive list of dissimilarities in operational requirements between the ECD There are ongoing efforts to integrate electrochromic device (ECD) technology with other electrochemical systems. ECDs made with safer "solid" polymer electrolytes (SPEs) are prone to performance degradations due to their high relaxation period that is detrimental to highly dynamic switching operations. Here, the fabrication of partially crystalline WO 3 based all-solid-state mono-electrochrome switches is reported that shows outstanding optical and electrical stability under prolonged charge-discharge cy...

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“…32 But, in the PVI-KOH lm, large peak broadening that cause disappearance of some normal modes, which reveals the amorphous nature of the lm. 33,34 It also suggests that the incorporation of large concentration of KOH in the PVI polymer signicantly affects the PVI polymer structure. 31 Fourier transform infrared (FTIR) study was also performed on a prepared pure PVI in order to understand the vibrational properties of polymer under ambient condition.…”

Section: Structural and Morphological Characteristics Of Prepared Pvimentioning

confidence: 99%

Ionic transport kinetics and enhanced energy storage in the electrode/poly(N-vinyl imidazole) interface for micro-supercapacitors

2020

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Preparation of KOH‐doped PVA/PSSA Solid Polymer Electrolyte for DMFC: The Influence of TiO₂ and PVP on Performance of Membranes

Cited by 16 publications

References 30 publications

Highly Zeolite-Loaded Polyvinyl Alcohol Composite Membranes for Alkaline Fuel-Cell Electrolytes

Highly Zeolite-Loaded Polyvinyl Alcohol Composite Membranes for Alkaline Fuel-Cell Electrolytes

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ionic transport kinetics and enhanced energy storage in the electrode/poly(N-vinyl imidazole) interface for micro-supercapacitors

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Preparation of KOH‐doped PVA/PSSA Solid Polymer Electrolyte for DMFC: The Influence of TiO2 and PVP on Performance of Membranes

Cited by 16 publications

References 30 publications

Highly Zeolite-Loaded Polyvinyl Alcohol Composite Membranes for Alkaline Fuel-Cell Electrolytes

Highly Zeolite-Loaded Polyvinyl Alcohol Composite Membranes for Alkaline Fuel-Cell Electrolytes

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ionic transport kinetics and enhanced energy storage in the electrode/poly(N-vinyl imidazole) interface for micro-supercapacitors

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Preparation of KOH‐doped PVA/PSSA Solid Polymer Electrolyte for DMFC: The Influence of TiO₂ and PVP on Performance of Membranes