scholarly journals Carbon-Supported Trimetallic Catalysts (PdAuNi/C) for Borohydride Oxidation Reaction

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1441
Author(s):  
Ahmed M. A. ElSheikh ◽  
Gordana Backović ◽  
Raisa C. P. Oliveira ◽  
César A. C. Sequeira ◽  
James McGregor ◽  
...  
Keyword(s):  
Power Density ◽  
Oxidation Reaction ◽  
Room Temperature ◽  
Fold Increase ◽  
Icp Oes ◽  
Alloy Particles ◽  
Highly Dispersed ◽  
Synthesis Procedure ◽  
Borohydride Oxidation ◽  
Scalable Synthesis

The synthesis of palladium-based trimetallic catalysts via a facile and scalable synthesis procedure was shown to yield highly promising materials for borohydride-based fuel cells, which are attractive for use in compact environments. This, thereby, provides a route to more environmentally friendly energy storage and generation systems. Carbon-supported trimetallic catalysts were herein prepared by three different routes: using a NaBH4-ethylene glycol complex (PdAuNi/CSBEG), a NaBH4-2-propanol complex (PdAuNi/CSBIPA), and a three-step route (PdAuNi/C3-step). Notably, PdAuNi/CSBIPA yielded highly dispersed trimetallic alloy particles, as determined by XRD, EDX, ICP-OES, XPS, and TEM. The activity of the catalysts for borohydride oxidation reaction was assessed by cyclic voltammetry and RDE-based procedures, with results referenced to a Pd/C catalyst. A number of exchanged electrons close to eight was obtained for PdAuNi/C3-step and PdAuNi/CSBIPA (7.4 and 7.1, respectively), while the others, PdAuNi/CSBEG and Pd/CSBIPA, presented lower values, 2.8 and 1.2, respectively. A direct borohydride-peroxide fuel cell employing PdAuNi/CSBIPA catalyst in the anode attained a power density of 47.5 mW cm−2 at room temperature, while the elevation of temperature to 75 °C led to an approximately four-fold increase in power density to 175 mW cm−2. Trimetallic catalysts prepared via this synthesis route have significant potential for future development.

A New Tunnel-Type V4O9 Cathode for High Power Density Aqueous Zinc Ion Batteries

2021 ◽  
Author(s):  
Qiaoran Wang ◽  
Tianjiang Sun ◽  
Shibing Zheng ◽  
Lin Li ◽  
Tao Ma ◽  
...  
Keyword(s):  
Power Density ◽  
Vanadium Pentoxide ◽  
High Power ◽  
Room Temperature ◽  
Zinc Ion ◽  
High Power Density ◽  
Tunnel Structure

The mixed valences V4O9 with tunnel structure and room temperature metallic properties are prepared via partially reducing vanadium pentoxide. The unique tunnel structure and metallic characteristics are beneficial to the...

Improvement of the Borohydride Oxidation Reaction by Electrocatalysis on Pt/[TaOPO4/VC]

2018 ◽  
Vol 86 (13) ◽  
pp. 659-670 ◽  
Author(s):  
Rachel Marielle Emily Hjelm ◽  
Yannick Garsany ◽  
Clémence Lafforgue ◽  
Marian Chatenet ◽  
Karen Swider-Lyons
Keyword(s):  
Oxidation Reaction ◽  
Borohydride Oxidation

scholarly journals Large Negative Photoresistivity in Amorphous NdNiO3 Film

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1411
Author(s):  
Alexandr Stupakov ◽  
Tomas Kocourek ◽  
Natalia Nepomniashchaia ◽  
Marina Tyunina ◽  
Alexandr Dejneka
Keyword(s):  
Energy Density ◽  
Optical Absorption ◽  
Power Density ◽  
Room Temperature ◽  
Amorphous Film ◽  
Amorphous Films ◽  
Metal Insulator ◽  
Wide Range ◽  
Potential Applications

A significant decrease in resistivity by 55% under blue lighting with ~0.4 J·mm−2 energy density is demonstrated in amorphous film of metal-insulator NdNiO3 at room temperature. This large negative photoresistivity contrasts with a small positive photoresistivity of 8% in epitaxial NdNiO3 film under the same illumination conditions. The magnitude of the photoresistivity rises with the increasing power density or decreasing wavelength of light. By combining the analysis of the observed photoresistive effect with optical absorption and the resistivity of the films as a function of temperature, it is shown that photo-stimulated heating determines the photoresistivity in both types of films. Because amorphous films can be easily grown on a wide range of substrates, the demonstrated large photo(thermo)resistivity in such films is attractive for potential applications, e.g., thermal photodetectors and thermistors.

Arginine-assisted synthesis of palladium nanochain networks and their enhanced electrocatalytic activity for borohydride oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 18111-18115 ◽  
Author(s):  
Geng-Tao Fu ◽  
Rui Wu ◽  
Chang Liu ◽  
Jun Lin ◽  
Dong-Mei Sun ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrocatalytic Activity ◽  
Oxidation Reaction ◽  
Three Dimensional ◽  
Assembly Process ◽  
Electrocatalytic Performance ◽  
Borohydride Oxidation

Three-dimensional Pd nanochain networks (Pd-NCNs) were prepared by an arginine-assisted self-assembly process, exhibiting excellent electrocatalytic performance towards the borohydride oxidation reaction.

CuWO4 as a photocatalyst for room temperature aerobic benzylamine oxidation

2018 ◽  
Vol 54 (9) ◽  
pp. 1101-1104 ◽  
Author(s):  
Aaron D. Proctor ◽  
Shobhana Panuganti ◽  
Bart M. Bartlett
Keyword(s):  
Oxidative Coupling ◽  
Oxidation Reaction ◽  
Room Temperature ◽  
Photo Oxidation

We report the first example of a controlled photo-oxidation reaction on CuWO4, the aerobic oxidative coupling of benzylamine.

Effect of MEAs Preparation Procedure on Their Performance in Room Temperature DMFC

2010 ◽  
Author(s):  
Evgeniy N. Gribov ◽  
Ivan M. Krivobokov ◽  
Aleksey G. Okunev
Keyword(s):  
Cyclic Voltammetry ◽  
Impedance Spectroscopy ◽  
Power Density ◽  
Room Temperature ◽  
Carbon Paper ◽  
Higher Power ◽  
Ptru Catalysts ◽  
Coated Carbon ◽  
Preparation Techniques ◽  
Coated Membrane

In this work the effect of the MEA preparation techniques on the performance of DMFC was evaluated using three different methods of electrocatalyst deposition: i) catalyst coated membrane; ii) catalyst coated carbon paper; and iii) decal deposition. Optimization of the nafion content (5–15 wt. %) at anode and cathode sides of the MEA and the pressure (150–500 atm) were also performed. Activities of both supported and unsupported Pt and PtRu catalysts (Johnson Matthew) were compared in room temperature DMFC (RT-DMFC) using polarization curves. All MEAs prepared were also characterized by electrochemical (cyclic voltammetry, impedance spectroscopy) methods. It was shown that optimal nafion content is 5–10 wt. % at both anode and cathode sides, while the optimal pressure is in the 300–500 atm. range. The unsupported catalysts showed slightly higher power density at RT-DMFC (∼ 14 mW/cm2) as compared to the supported ones (∼10 mW/cm2) at the same Pt load. Variation of the wetness of MEAs upon mounting in DMFC allowed us to increase of the power density of RT-DMFC up to 32 mW/cm2.

GOLD SUPPORTED CALCIUM DEFICIENT HYDROXYAPATITE FOR ROOM TEMPERATURE CO OXIDATION

2012 ◽  
Vol 11 (03) ◽  
pp. 1240004 ◽  
Author(s):  
E. LINGA REDDY ◽  
A. PRABHAKARN ◽  
J. KARUPPIAH ◽  
N. RAMESHBABU ◽  
CH. SUBRAHMANYAM
Keyword(s):  
Co Oxidation ◽  
Surface Properties ◽  
Microwave Synthesis ◽  
Room Temperature ◽  
Supported Catalysts ◽  
Gold Catalyst ◽  
Precipitation Method ◽  
Optimum Number ◽  
Icp Oes ◽  
Nanostructured Gold

Gold supported hydroxyapatite (HA) and calcium deficient hydroxyapatite (CDHA) was studied for the room temperature CO oxidation. Nanostructured gold catalyst has been prepared by deposition precipitation method, whereas HA was synthesized by microwave synthesis. Inorder to understand the influence of surface properties of HA, support HA was synthesized with different Ca/P ratios (1.67, 1.62, 1.57, 1.534 and 1.5). The gold supported catalysts were characterized by XRD, BET, ICP-OES and TEM. Typical results indicate that gold supported 1.57 HA shows higher activity compared to other HA catalysts (1.67, 1.62, 1.534 and 1.5) which may be due to the presence of optimum number of acidic and basic sites.

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