Bio-Based Graphene Sheet/Copolymer Composite as Supporting Material for Nanocatalysts towards Electrochemical Studies and Direct Alkaline Alcohol Fuel Cells

In this work, graphene carbon sheets (BGS) were prepared from writing paper and lemon peel, and its polymer composite has a higher surface area compared with the existing Vulcan carbon. Further, the use of lead as a promoter for the oxidation of alcohol and CO on platinum-supported poly(amine-terminated cyclophosphazene-co-cyclophosphazene)-biobased graphene sheet (Poly(AFCP-co-CP)-BGS) composite was demonstrated. The size, phase morphology, and distribution of metal nanoparticles on Poly(AFCP-co-CP)-BGS composite as well as the formation of composite based catalysts were confirmed from TEM, XRD, and FTIR studies. The catalytic activity and stability of the prepared catalysts were tested and compared to methanol, ethylene glycol, glycerol, and CO in 0.5 M KOH solution. The results conclude that the lead-doped Pt/Poly(AFCP-co-CP)-BGS catalyst shows higher oxidation current with respect to onset potential and lower I f / I r ratio for alcohol as well as CO oxidation. In addition, Pt-Pb/Poly(AFCP-co-CP)-BGS catalyst was checked for direct alkaline fuel cells and proved as a potent anode catalyst in alkaline medium for real-time fuel battery applications. In addition, Poly(AFCP-co-CP)-BGS composite also promotes the catalytic reaction compared to Poly(AFCP-co-CP) and BGS supports as noticed from methanol oxidation in alkaline medium. The surface area of the prepared supporting material is 750.72 m2g-1, which is higher than the activated carbon (250.12m2g-1). So, the prepared Poly(AFCP-co-CP)-BGS composite is a potent support for metal deposition, electrooxidation, and single stack fuel cell constructions.

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Improvement of Catalytic Activity of Platinum Nanoparticles Decorated Carbon Graphene Composite on Oxygen Electroreduction for Fuel Cells

Processes ◽

10.3390/pr7090586 ◽

2019 ◽

Vol 7 (9) ◽

pp. 586 ◽

Cited By ~ 7

Author(s):

Halima Begum ◽

Young-Bae Kim

Keyword(s):

Catalytic Activity ◽

Fuel Cells ◽

Surface Area ◽

High Performance ◽

Pt Nanoparticles ◽

Reduction Reaction ◽

Graphene Sheets ◽

Crossover Effect ◽

Onset Potential ◽

Monolayer Dispersion

High-performance platinum (Pt)-based catalyst development is crucially important for reducing high overpotential of sluggish oxygen reduction reaction (ORR) at Pt-based electrocatalysts, although the high cost and scarcity in nature of Pt are profoundly hampering the practical use of it in fuel cells. Thus, the enhancing activity of Pt-based electrocatalysts with minimal Pt-loading through alloy, core−shell or composite making has been implemented. This article deals with enhancing electrocatalytic activity on ORR of commercially available platinum/carbon (Pt/C) with graphene sheets through a simple composite making. The Pt/C with graphene sheets composite materials (denoted as Pt/Cx:G10−x) have been characterized by several instrumental measurements. It shows that the Pt nanoparticles (NPs) from the Pt/C have been transferred towards the π-conjugated systems of the graphene sheets with better monolayer dispersion. The optimized Pt/C8:G2 composite has higher specific surface area and better degree of graphitization with better dispersion of NPs. As a result, it shows not only stable electrochemical surface area but also enhanced ORR catalytic activity in respect to the onset potential, mass activity and electron transfer kinetics. As shown by the ORR, the Pt/C8:G2 composite is also better resistive to the alcohol crossover effect and more durable than the Pt/C.

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Use of urchin-like NixCo3−xO4 hierarchical nanostructures based on non-precious metals as bifunctional electrocatalysts for anion-exchange membrane alkaline alcohol fuel cells

Nanoscale ◽

10.1039/c4nr01802h ◽

2014 ◽

Vol 6 (16) ◽

pp. 9665-9672 ◽

Cited By ~ 56

Author(s):

Palanisamy Manivasakan ◽

Parthiban Ramasamy ◽

Jinkwon Kim

Keyword(s):

Fuel Cells ◽

Oxygen Reduction ◽

Anion Exchange ◽

Precious Metals ◽

Anion Exchange Membrane ◽

Oxidation Reactions ◽

Alkaline Fuel Cells ◽

Hierarchical Nanostructures ◽

Alcohol Fuel ◽

Exchange Membrane

Urchin like NixCo3−xO4 hierarchical nanostructures were demonstrated as promising electrocatalysts for oxygen reduction and methanol oxidation reactions in alkaline fuel cells.

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Electro-catalytic Activity of Carbon Nanofibers Supported Palladium Nanoparticles for Direct Alcohol Fuel Cells in Alkaline Medium

Electrocatalysis ◽

10.1007/s12678-019-00533-6 ◽

2019 ◽

Vol 10 (4) ◽

pp. 420-428 ◽

Cited By ~ 3

Author(s):

L. L. Sikeyi ◽

A. S. Adekunle ◽

N. W. Maxakato

Keyword(s):

Catalytic Activity ◽

Fuel Cells ◽

Carbon Nanofibers ◽

Alkaline Medium ◽

Palladium Nanoparticles ◽

Direct Alcohol Fuel Cells ◽

Alcohol Fuel ◽

Supported Palladium ◽

Electro Catalytic Activity

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N- and S-doped mesoporous carbon as metal-free cathode catalysts for direct biorenewable alcohol fuel cells

Journal of Materials Chemistry A ◽

10.1039/c5ta06039g ◽

2016 ◽

Vol 4 (1) ◽

pp. 83-95 ◽

Cited By ~ 59

Author(s):

Yang Qiu ◽

Jiajie Huo ◽

Fan Jia ◽

Brent. H. Shanks ◽

Wenzhen Li

Keyword(s):

Fuel Cells ◽

Fuel Cell ◽

Surface Area ◽

Mesoporous Carbon ◽

Carbon Materials ◽

Half Cell ◽

Cathode Catalysts ◽

Metal Free ◽

Alcohol Fuel ◽

Orr Activity

N and S dual-doped carbon materials, N-S-CMK-3, are fabricated with >1000 m2 g−1 surface area and uniform mesoporous and macroporous structures, and exhibit outstanding ORR activity and durability in both half cell and direct biorenewable alcohol fuel cell tests.

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Improved performance of Pd electrocatalyst supported on ultrahigh surface area hollow carbon spheres for direct alcohol fuel cells

Journal of Power Sources ◽

10.1016/j.jpowsour.2007.11.024 ◽

2008 ◽

Vol 177 (1) ◽

pp. 61-66 ◽

Cited By ~ 90

Author(s):

Feng Ping Hu ◽

Zhenyou Wang ◽

Yongliang Li ◽

Changming Li ◽

Xin Zhang ◽

...

Keyword(s):

Fuel Cells ◽

Surface Area ◽

Carbon Spheres ◽

Direct Alcohol Fuel Cells ◽

Alcohol Fuel ◽

Improved Performance ◽

Hollow Carbon ◽

Hollow Carbon Spheres

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Optimisation Study of Co Deposition on Chars from MAP of Waste Tyres as Green Electrodes in ORR for Alkaline Fuel Cells

Energies ◽

10.3390/en13215646 ◽

2020 ◽

Vol 13 (21) ◽

pp. 5646

Author(s):

Maurizio Passaponti ◽

Leonardo Lari ◽

Marco Bonechi ◽

Francesca Bruni ◽

Walter Giurlani ◽

...

Keyword(s):

Catalytic Activity ◽

Fuel Cells ◽

Electrochemical Deposition ◽

Noble Metals ◽

Reduction Reaction ◽

Structure Evolution ◽

Alkaline Fuel Cells ◽

Onset Potential ◽

Electro Catalysis ◽

Scanning Transmission

Oxygen Reduction Reaction (ORR) catalysts, from waste automobile tyres obtained from Microwave assisted pyrolysis (MAP), were enriched with Co and Cu using the simple treatments sonochemical and electrochemical deposition. Catalytic activity was evaluated through onset potential and number of exchanged electrons measurements. Electrochemical data demonstrate an improvement in catalytic activity of the electrochemical modified char with Co. Char electrodes enriched with Co show a maximum positive shift of 40 mV with respect to raw char electrodes with a number of exchanged electrons per O2 molecule close to 4 (as for Pt) for the best sample. This corresponds to a reduction of the production of unwanted oxygen peroxide from 23% for raw char to 1%. Sample structure evolution before and after electrochemical deposition and electro-catalysis was investigated by scanning transmission electron microscopy and XPS. Such electrochemical treatments open new possibilities of refining waste chars and finding an economic alternative to noble metals-based catalysts for alkaline fuel cells.

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Effect of V/Mo Ratio on Structural Properties of VxMo(1-x)Oy Nanoparticles Used as Alkaline Fuel Cell Catalyzer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.492.346 ◽

2014 ◽

Vol 492 ◽

pp. 346-349

Author(s):

Berceste Beyribey ◽

Berrin Saygi ◽

Selen Ezgi Acikyildiz ◽

Lusi Culcu ◽

Bayram Mutlu ◽

...

Keyword(s):

Fuel Cells ◽

Fuel Cell ◽

Surface Area ◽

Structural Properties ◽

Sem Analysis ◽

Bet Surface Area ◽

Alkaline Fuel Cell ◽

Nanosized Particles ◽

Alkaline Fuel Cells

V0.3Mo0.7O3and V0.6Mo0.4O3nanoparticles were synthesized through reducing acidified vanadate and molybdate solution at around 60-70°C. The catalysts are aimed to be used as anode in alkaline fuel cells. BET and SEM analysis are done to characterize the obtained particles. According to the SEM results, both compounds were formed in nanosized particles and BET results showed that BET surface area of V0.3Mo0.7O3catalyst has 5 times higher than that of V0.6Mo0.4O3.

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