Showing papers on "Direct methanol fuel cell published in 2019"
TL;DR: In this paper, a new two-dimensional (2D)/2D composite of Bi2WO6/MoS2 was facile synthesized, and then was used as supporting material for depositing Pt nanoparticles.
147 citations
TL;DR: In this paper, a low cost and novel architecture Direct Methanol Fuel Cell (DMFC) for mobility and portable applications is reported, which is based on a modification of the hydrophobicity of the BPP (Bi-Polar Plate) flow field channels.
102 citations
TL;DR: In this article, a composite of multi-wall carbon nanotubes (MWCNTs) decorated with MoS2 quantum dots (MoS2 QDs) and Ti3C2Tx QDs (denoted by MoS 2QDs@Ti3C 2TxQD@MMWCNTs), was synthesized for oxygen reduction reaction and methanol oxidation reaction.
100 citations
TL;DR: In this paper, the shape-controlled synthesis of palladium nanocrystals supported on the surface of graphene is of great importance in designing an electrocatalyst for direct methanol fuel cells.
99 citations
TL;DR: The results show that the synthetic nanocatalyst can have promising applications for hydrogen evolution and methanol oxidation reactions and increase the electron transfer rate due to adding conductive RGO to the catalyst.
89 citations
TL;DR: In this article, a simple one-step preparation of a novel graphitic carbon nitride/Polyaniline/Palladium nanoparticles (g-C3N4/PANI/PdNPs) based nanohybrid composite modified screen-printed electrode (SPE) for the efficient electro-oxidation reaction of methanol.
82 citations
TL;DR: In this article, the as-prepared reduced graphene oxide (RGO) catalysts were extensively characterized by x-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrograph (RPS) and energy dispersive xray spectroscope (EDX), high resolution transmission electron microscopy (HRTEM) and field emission scanning electron microscope (FESEM), respectively.
69 citations
TL;DR: In this paper, an electrochemical oxidation of methanol to formic acid using the catalytic Nickel Benzene tricarboxylic acid metal organic framework (Ni-BTC-MOF) and reduced graphene oxide (rGO) nanocomposites modified glassy carbon electrode GCE in alkaline media, which was examined via cyclic voltammetry technique.
Abstract: In this study, electrochemical oxidation of methanol to formic acid using the economical and highly active catalytic Nickel Benzene tricarboxylic acid metal organic framework (Ni-BTC-MOF) and reduced graphene oxide (rGO) nanocomposites modified glassy carbon electrode GCE in alkaline media, which was examined via cyclic voltammetry technique. Nickel based MOF and rGO nanocomposites were prepared by solvothermal approach, followed by morphological and structural characterization of prepared samples through X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and energy dispersive X-ray (EDX) analysis. The electrochemical testing of synthesized materials represents the effect of the sequential increase in rGO concentration on electrocatalytic activity. The Ni-BTC/4 wt % rGO composite with a pronounced current density of 200.22 mA/cm2 at 0.69 V versus Hg/HgO electrode at 50 mV/s was found to be a potential candidate for methanol oxidation in Direct Methanol Fuel Cell (DMFC) applications. Product analysis was carried out through Gas Chromatography (GC) and Nuclear Magnetic Resonance (NMR) spectroscopy, which confirmed the formation of formic acid during the oxidation process, with approximately 62% yield.
61 citations
TL;DR: In this article, direct methanol fuel cells (DMFCs) have the major advantage of the high energy density of the methenol (4.33 kWh/l) they use as a liquid fuel, although their costs remain too high due to the high q
Abstract: Direct methanol fuel cells (DMFCs) have the major advantage of the high energy density of the methanol (4.33 kWh/l) they use as a liquid fuel, although their costs remain too high due to the high q...
60 citations
TL;DR: In this paper, the performance of both fuel cell types, cathode air-breathing H2 Proton Exchange Membrane Fuel Cells (PEMFC/H2) and passive DMFCs, is dependent on atmospheric conditions such as pressure, relative humidity and temperature.
58 citations
TL;DR: In this article, the performance of a direct methanol fuel cell was improved by incorporating graphene oxide to Nafion-mordenite composite membranes to enhance the compatibility and to decrease methenol permeability.
TL;DR: The fabricated catalysts were characterized by XRD, EDS, SEM, and TEM as discussed by the authors, indicating a faster electron transfer from the Ni/NiO/MWCNT to methanol and faster reaction kinetics.
TL;DR: In this article, an efficient and CO-tolerant anode catalyst for direct methanol fuel cell is fabricated by depositing PtRu alloy nanoparticles (∼3nm) on nanoporous gold film (NPG-PtRu).
TL;DR: In this article, the concept of synthesizing graphene nanoribbon-graphene quantum dot (GNR-GQD) hybrids with even grafting of GQD on GNR sheet in a facile single step process under ultrasonication in chlorosulfonic acid.
TL;DR: In this article, a dual metal dual metal electrocatalyst based on CoS2/MoS2 embedded in reduced graphene oxide (rGO) was synthesized for direct methanol fuel cells and hydrogen generation applications.
TL;DR: In this paper, the intrinsic ORR activity of Fe-N-C electrocatalyst is studied by Rotating Disk Electrode (RDE) technique with and with no methanol added, confirming material inactivity towards Methanol Oxidation Reaction (MOR).
TL;DR: In this article, a binder-free Pt and Mn2O3 based catalyst was synthesized by pulsed laser deposition and the resulting binary material exhibits practically identical electrocatalytic activity to that of Pt towards ORR in alkaline media.
TL;DR: In this paper, rice husk ash (RHA) was used as a bio-filler in sulfonated polyimide (SPI) composite membranes to reduce the proton conductivity and methanol permeability.
TL;DR: In this article, the electrocatalyst, PtRu/TiO2-CNF, is produced by the deposition method and is subjected to electrochemical measurement and cyclic voltammetry (CV) to measure half-cell performance in a DMFC.
TL;DR: The present review emphasises the proton conductivity and methanol permeability of nanocomposite membranes with carbon nanotubes, graphene oxide and fullerene as additives, assessing critically the impact of each type of filler on those properties.
Abstract: A membrane electrolyte that restricts the methanol cross-over while retaining proton conductivity is essential for better electrochemical selectivity in direct methanol fuel cells (DMFCs). Extensive research carried out to explore numerous blends and composites for application as polymer electrolyte membranes (PEMs) revealed promising electrochemical selectivity in DMFCs of carbon nanomaterial-based polymer composites. The present review covers important literature on different carbon nanomaterial-based PEMs reported during the last decade. The review emphasises the proton conductivity and methanol permeability of nanocomposite membranes with carbon nanotubes, graphene oxide and fullerene as additives, assessing critically the impact of each type of filler on those properties.
TL;DR: The synthesized hollow Pt-Ni/C (R2) nanoboxes may prove to be a valuable and highly efficient catalysts for the electrochemical oxidation of methanol due to their low cost, numerous catalytically active sites, low carbon monoxide poisoning, large electroactive surface area and long-term stability.
Abstract: In direct methanol fuel cell technology, highly stable electrochemical catalysts are critically important for their practical utilization at the commercial scale. In this study, sub ~10 nm hollow Pt-Ni (1:1 at. ratio) nanoboxes supported on functionalized Vulcan carbon (Pt-Ni/C-R2) were synthesized through a facile method for the efficient electrooxidation of methanol. Two reaction procedures, namely, a simultaneous reduction and a modified sequential reduction method using a reverse microemulsion (RME) method, were adopted to synthesize solid Pt-Ni NPs and hollow nanoboxes, respectively. To correlate the alloy composition and surface structure with the enhanced catalytic activity, the results were compared with the nanocatalyst synthesized using a conventional NaBH4 reduction method. The calculated electroactive surface area for the Pt-Ni/C-R2 nanoboxes was 190.8 m2.g−1, which is significantly higher compared to that of the Pt-Ni nanocatalyst (96.4 m2.g−1) synthesized by a conventional reduction method. Hollow nanoboxes showed 34% and 44% increases in mass activity and rate of methanol oxidation reaction, respectively, compared to solid NPs. These results support the nanoreactor confinement effect of the hollow nanoboxes. The experimental results were supported by Density Functional Theory (DFT) studies, which revealed that the lowest CO poisoning of the Pt1Ni1 catalyst among all Ptm-Nin mixing ratios may account for the enhanced methanol oxidation. The synthesized hollow Pt-Ni/C (R2) nanoboxes may prove to be a valuable and highly efficient catalysts for the electrochemical oxidation of methanol due to their low cost, numerous catalytically active sites, low carbon monoxide poisoning, large electroactive surface area and long-term stability.
TL;DR: In this paper, a two-dimensional, two-phase, steady-state model was presented to shed light on the ordered direct methanol fuel cells, where both radial and axial transports of oxygen along the carbon nanowire in the order-structured cathode catalyst layer were considered.
TL;DR: In this article, a central composite design (CCD) of the response surface method (RSM) was used to optimize the weight percentage of incorporated components in sulfonated poly ether sulfone nanocomposite membranes and predict their performance.
TL;DR: In this paper, a novel polyvinyl alcohol (PVA) nanofibers with incorporated CuO and Co3O4 nanoparticles were synthesized through a conventional single-nozzle electrospinning technique and characterized by atomic force microscopy (AFM), energy dispersive X-ray analysis (EDX), fourier transform infrared spectroscopy (FT-IR), elemental analysis, transmission electron microscopy, differential thermal analysis (DTA), scanning electron microscope, and thermogravimetric analysis (TGA).
TL;DR: The platinum-decorated graphene aerogel microspheres exhibit an extremely high mass activity toward methanol oxidation as well as excellent antipoisoning ability, which are dramatically enhanced compared with Pt particles dispersed on graphene oxide and commercial carbon black supports.
Abstract: Platinum-decorated graphene aerogel microspheres were fabricated through a combined electrospraying, freeze-casting, and solvothermal process. Platinum nanoparticles with a narrow size distribution are evenly anchored on the graphene aerogel microspheres without agglomeration benefitting from the distinct center-diverging microchannel structure of the graphene aerogel microspheres, which results in the as-prepared catalysts presenting excellent electrocatalytic performance including high electrocatalytic activity and high poison tolerance toward methanol electro-oxidation, showing great potential for direct methanol fuel cell anode catalysts. In particular, the platinum-decorated graphene aerogel microspheres exhibit an extremely high mass activity of 1098.9 mA mg–1 toward methanol oxidation as well as excellent antipoisoning ability, which are dramatically enhanced compared with Pt particles dispersed on graphene oxide and commercial carbon black supports.
13 Feb 2019
TL;DR: In this article, a crystalline poly(ether ketone) (PEK) hydrophobic backbone is used to ensure superior solvent resistance and dimensional stability, guaranteeing the durability of the membrane in practical applications.
Abstract: Crystallized sulfonated poly(arylene ether ketone) (Cr-SPAEK) materials constructed from dense sulfonated hydrophilic segments and crystalline poly(ether ketone) (PEK) hydrophobic backbone were designed. The membrane exhibited considerable proton conductivity and superb solvent resistance owing to its special phase morphology, the presence of a broad hydrophilic ion transport channel, and a crystalline hydrophobic matrix. The dense sulfonated hydrophilic segment provides excellent proton conductivity; the Cr-SPAEK-20 membrane exhibits higher proton-conducting ability than Nafion 117 in the temperature range of 20–100 °C; its proton conductivity reaches about 168 mS cm–1 at 100 °C. The crystalline PEK hydrophobic segment ensures superior solvent resistance and dimensional stability, guaranteeing the durability of the membrane in practical applications. The methanol permeability of Cr-SPAEK-20 is only one-eighth that of Nafion 117 when the test conditions are the same. The direct methanol fuel cell (DMFC), ...
TL;DR: In this article, a nanocomposite material employing gold nanoparticles and fullerene-C60 at glassy carbon electrode (AuNP@reduced-fullerene C60/GCE) as anode for high performance oxidation of methanol was developed.
TL;DR: In this article, a multilayer (ML) membrane configuration prepared by a simple pressing technique is employed with and without the incorporation of sprayed cellulose nanocrystals (CNC) to achieve enhanced membrane properties.
TL;DR: In this paper, a quaternized poly[O-(2-imidazolyethylene)-N-picolylchitosan (QPIENPC) was synthesized by copolymerizing a chitosin-based membrane with vinylimidazole derivatives.
TL;DR: In this article, a Nafion-Sulfonated covalent organic nanosheets (SCONs) with a functional group (−SO3H) was used to reduce the channel length and facilitate proton diffusion.