High Surface Area Molybdenum Nitride Support for Fuel Cell Electrodes

2011 ◽  
Vol 158 (10) ◽  
pp. B1255 ◽  
Author(s):  
K. J. Blackmore ◽  
L. Elbaz ◽  
E. Bauer ◽  
E. L. Brosha ◽  
K. More ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Molybdenum Nitride ◽  
Fuel Cell Electrodes

Spontaneous formation of nanoparticles on electrospun fibers for fuel cell electrodes

2018 ◽  
Author(s):  
Norbert Radacsi ◽  
Fernando Diaz Campos ◽  
Calum Chisholm ◽  
Konstantinos P. Giapis
Keyword(s):  
Fuel Cell ◽  
Surface Area ◽  
State Of The Art ◽  
High Surface ◽  
High Surface Area ◽  
Cell Voltage ◽  
Dihydrogen Phosphate ◽  
Large Area ◽  
Fuel Cell Electrodes ◽  
Electrolyte Surface

Nanofibers spontaneously decorated with nanoparticles were synthesized by nozzle-free electrospinning, showcasing the latter as a novel, inexpensive and scalable method for depositing high-surface area composites. Layers of nanofibers of the intermediate-temperature proton conducting electrolyte cesium dihydrogen phosphate, (CsH2PO4, CDP), were deposited from homogeneous undersaturated solutions of CDP and polyvinylpyrrolidone (PVP), uniformly over large area substrates. Under certain conditions, the nanofibers develop CDP nanoparticles on their surface, which increases the exposed electrolyte surface area and ultimately enhances electrocatalytic performance. Indeed, fuel cell tests on cathodes made of processed nanoparticle-decorated CDP nanofibers produced higher cell voltage, as compared to state-of-the-art electrodes.

Facile synthesis of high surface area molybdenum nitride and carbide

2015 ◽  
Vol 228 ◽  
pp. 232-238 ◽  
Author(s):  
Aaron Roy ◽  
Alexey Serov ◽  
Kateryna Artyushkova ◽  
Eric L. Brosha ◽  
Plamen Atanassov ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Molybdenum Nitride ◽  
Facile Synthesis

Growth of Carbon Nanotubes on Carbon Toray Paper for Bio-Fuel Cell Applications

2007 ◽  
Author(s):  
Bhupesh Chandra ◽  
Joshua T. Kace ◽  
Yuhao Sun ◽  
S. C. Barton ◽  
James Hone
Keyword(s):  
Carbon Nanotubes ◽  
Fuel Cell ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Multiwall Carbon Nanotubes ◽  
Volume Ratio ◽  
Carbon Paper ◽  
Heating Process ◽  
Scale Production

In recent years carbon nanotubes have emerged as excellent materials for applications in which high surface area is required e.g. gas sensing, hydrogen storage, solar cells etc. Ultra-high surface to volume ratio is also a desirable property in the applications requiring enhanced catalytic activity where these high surface area materials can act as catalyst supports. One of the fastest developing areas needing such materials is fuel-cell. Here we investigate the process through which carbon nanotubes can be manufactured specifically to be used to increase the surface area of a carbon paper (Toray™). This carbon support is used in bio-catalytic fuel cell as an electrode to support enzyme which catalyzes the redox reaction. Deposition of nanotubes on these carbon fibers can result in great enhancement in the overall surface area to support the enzyme, which increases the reaction rate inside the fuel cell. The present paper describes a method to achieve ultra-thick growth of multiwall carbon nanotubes (MWNT) on a carbon Toray™ paper using a joule heating process and gas-phase catalyst. Using this method, we are able to achieve rapid, high-density, and uniform MWNT growth. This method is also potentially scalable toward larger-scale production.

Microstructural factors influencing the properties of high surface area molybdenum nitride films converted from molybdenum trioxide films deposited via solution spray pyrolysis

1998 ◽  
Vol 13 (8) ◽  
pp. 2237-2244 ◽  
Author(s):  
S. L. Roberson ◽  
D. Finello ◽  
R. F. Davis
Keyword(s):  
Grain Size ◽  
Spray Pyrolysis ◽  
Surface Area ◽  
Molybdenum Trioxide ◽  
High Surface ◽  
High Surface Area ◽  
Degree Of Crystallinity ◽  
Molybdenum Nitride ◽  
Ambient Conditions ◽  
Average Grain Size

Molybdenum trioxide (MoO3) films, 15 µm thick, have been deposited on 50 µm thick polycrystalline titanium substrates from 250 to 500 °C via liquid spray pyrolysis. Molybdenum pentachloride (MoCl5) dissolved in methanol was used as the molybdenum source; ambient conditions provided the oxygen source. X-ray diffraction (XRD) data indicated that amorphous MoO3 films were produced at deposition temperatures below 400 °C. Randomly orientated polycrystalline MoO3 films were produced at 400 °C and higher deposition temperatures. The deposition temperature also influenced the surface area of the films and their average grain size. Subsequent conversion of the MoO3 films to high surface area (HSA) conductive films containing both γ–Mo2N and δ–MoN was accomplished via programmed reactions with anhydrous NH3 and involved the formation of MoO2 and MoOxN1−x as intermediate phases. The degree of crystallinity, surface area, and average grain size of the MoO3 films strongly influenced the average grain size and surface area of the resultant MoxN films.

Sign in / Sign up

Export Citation Format

Share Document