scholarly journals Making an ultralow platinum content bimetallic catalyst on carbon fibres for electro-oxidation of ammonia in wastewater

2019 ◽  
Vol 3 (8) ◽  
pp. 2111-2124 ◽  
Author(s):  
A. M. Pourrahimi ◽  
R. L. Andersson ◽  
K. Tjus ◽  
V. Ström ◽  
A. Björk ◽  
...  
Keyword(s):  
Surface Area ◽  
Bimetallic Catalyst ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Gas ◽  
Metal Alloy ◽  
Carbon Fibres ◽  
Platinum Content ◽  
Platinum Coating ◽  
Electro Oxidation

Conductive high surface area carbon fibres with a bimetallic copper–platinum coating are used as electrode for electro-oxidation of wastewater ammonia. The metal alloy is presented as a novel inexpensive catalyst for the generation of hydrogen gas.

4946663 Production of high surface area carbon fibres

Carbon ◽  
1991 ◽  
Vol 29 (8) ◽  
pp. I
Author(s):  
Gary J Audley ◽  
Ala Grint
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Fibres

The Electro-oxidation of Ethanol on Pt-Ru and Pt-Mo Particles Supported on High-Surface-Area Carbon

2002 ◽  
Vol 149 (3) ◽  
pp. A272 ◽  
Author(s):  
A. Oliveira Neto ◽  
M. J. Giz ◽  
J. Perez ◽  
E. A. Ticianelli ◽  
E. R. Gonzalez
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Electro Oxidation ◽  
Oxidation Of Ethanol

scholarly journals Multifunctional structural energy storage composite supercapacitors

2014 ◽  
Vol 172 ◽  
pp. 81-103 ◽  
Author(s):  
Natasha Shirshova ◽  
Hui Qian ◽  
Matthieu Houllé ◽  
Joachim H. G. Steinke ◽  
Anthony R. J. Kucernak ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibre ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Active Surface ◽  
Initial Reaction ◽  
Active Surface Area ◽  
Carbon Fibres ◽  
Structural Carbon

This paper addresses the challenge of producing multifunctional composites that can simultaneously carry mechanical loads whilst storing (and delivering) electrical energy. The embodiment is a structural supercapacitor built around laminated structural carbon fibre (CF) fabrics. Each cell consists of two modified structural CF fabric electrodes, separated by a structural glass fibre fabric or polymer membrane, infused with a multifunctional polymeric electrolyte. Rather than using conventional activated carbon fibres, structural carbon fibres were treated to produce a mechanically robust, high surface area material, using a variety of methods, including direct etching, carbon nanotube sizing, and carbon nanotubein situgrowth. One of the most promising approaches is to integrate a porous bicontinuous monolithic carbon aerogel (CAG) throughout the matrix. This nanostructured matrix both provides a dramatic increase in active surface area of the electrodes, and has the potential to address mechanical issues associated with matrix-dominated failures. The effect of the initial reaction mixture composition is assessed for both the CAG modified carbon fibre electrodes and resulting devices. A low temperature CAG modification of carbon fibres was evaluated using poly(3,4-ethylenedioxythiophene) (PEDOT) to enhance the electrochemical performance. For the multifunctional structural electrolyte, simple crosslinked gels have been replaced with bicontinuous structural epoxy–ionic liquid hybrids that offer a much better balance between the conflicting demands of rigidity and molecular motion. The formation of both aerogel precursors and the multifunctional electrolyte are described, including the influence of key components, and the defining characteristics of the products. Working structural supercapacitor composite prototypes have been produced and characterised electrochemically. The effect of introducing the necessary multifunctional resin on the mechanical properties has also been assessed. Larger scale demonstrators have been produced including a full size car boot/trunk lid.

Palladium aerogel as a high-performance electrocatalyst for ethanol electro-oxidation in alkaline media

2017 ◽  
Vol 5 (21) ◽  
pp. 10244-10249 ◽  
Author(s):  
Mehdi Zareie Yazdan-Abad ◽  
Meissam Noroozifar ◽  
Ali Reza Modaresi Alam ◽  
Hamideh Saravani
Keyword(s):  
Surface Area ◽  
Noble Metal ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Alkaline Media ◽  
3D Nanostructures ◽  
Electro Oxidation

Noble metal aerogels as three-dimensional (3D) nanostructures with high surface area and large porosity are known to be exceptional materials that can be applied in the area of catalysis applications.

scholarly journals Adsorptivities of Extremely High Surface Area Activated Carbon Fibres for CH4 and H2

2009 ◽  
Vol 27 (9) ◽  
pp. 877-881 ◽  
Author(s):  
A. Rejifu ◽  
H. Noguchi ◽  
T. Ohba ◽  
H. Kanoh ◽  
F. Rodriguez-Reinoso ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Fibres ◽  
Activated Carbon Fibres

scholarly journals Atomic Layer Deposition of TiO2 Nanocoatings on ZnO Nanowires for Improved Photocatalytic Stability

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Emmeline Kao ◽  
Hyun Sung Park ◽  
Xining Zang ◽  
Liwei Lin
Keyword(s):  
Atomic Layer Deposition ◽  
Surface Area ◽  
Water Splitting ◽  
High Surface ◽  
Nanowire Array ◽  
High Surface Area ◽  
Atomic Layer ◽  
Zno Nanowires ◽  
Hydrogen Gas ◽  
Layer Deposition

Photocatalytic water splitting represents an emerging technology well positioned to satisfy the growing need for low-energy, low CO2, economically viable hydrogen gas production. As such, stable, high-surface-area electrodes are increasingly being investigated as electrodes for the photochemical conversion of solar energy into hydrogen fuel. We present a titanium dioxide (TiO2)/zinc oxide (ZnO) nanowire array using a hybrid hydrothermal/atomic layer deposition (ALD) for use as a solar-powered photoelectrochemical device. The nanowire array consists of single crystalline, wurtzite ZnO nanowires with a 40 nm ALD TiO2 coating. By using a TiO2 nanocoating on the high surface area-ZnO array, three advancements have been accomplished in this work: (1) high aspect ratio nanowires with TiO2 for water splitting (over 8 μm), (2) improved stability over bare ZnO nanowires during photocatalysis, and (3) excellent onset voltage. As such, this process opens up new class of the micro/nanofabrication process for making efficient photocatalytic gas harvesting systems.

Structure and composition of metal particles in Pt-Sn/Al2O3 bimetallic catalysts

1990 ◽  
Vol 48 (4) ◽  
pp. 278-279
Author(s):  
A. Sachdev ◽  
J. Schwank
Keyword(s):  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Size Structure ◽  
High Surface ◽  
High Surface Area ◽  
Metal Particles ◽  
Alloy Formation ◽  
Particle Size Range ◽  
Oxide Supports ◽  
Petroleum Fractions

Platinum - tin bimetallic catalysts have been primarily utilized in the chemical industry in the catalytic reforming of petroleum fractions. In this process the naphtha feedstock is converted to hydrocarbons with higher octane numbers and high anti-knock qualities. Most of these catalysts contain small metal particles or crystallites supported on high surface area insulating oxide supports. The determination of the structure and composition of these particles is crucial to the understanding of the catalytic behavior. In a bimetallic catalyst it is important to know how the two metals are distributed within the particle size range and in what way the addition of a second metal affects the size, structure and composition of the metal particles. An added complication in the Pt-Sn system is the possibility of alloy formation between the two elements for all atomic ratios.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

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