Pt-Au bimetallic nanoparticles decorated on reduced graphene oxide as an excellent electrocatalysts for methanol oxidation

2016 ◽  
Vol 219 ◽  
pp. 52-59 ◽  
Author(s):  
A.T. Ezhil Vilian ◽  
Seung-Kyu Hwang ◽  
Cheol Hwan Kwak ◽  
Seo Yeong Oh ◽  
Chang-Yeon Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Methanol Oxidation ◽  
Bimetallic Nanoparticles ◽  
Reduced Graphene

Ultrafine Pt–Ru bimetallic nanoparticles anchored on reduced graphene oxide sheets as highly active electrocatalysts for methanol oxidation

2017 ◽  
Vol 1 (4) ◽  
pp. 757-766 ◽  
Author(s):  
G. Vishwakshan Reddy ◽  
P. Raghavendra ◽  
B. Ankamwar ◽  
P. Sri Chandana ◽  
S. M. Senthil Kumar ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Methanol Oxidation ◽  
Bimetallic Nanoparticles ◽  
Ammonia Borane ◽  
Reducing Agent ◽  
Highly Active ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets

Herein, uniform sized Pt–Ru bimetallic nanoparticles were deposited on a reduced graphene oxide (RGO) support using methyl ammonia borane as a reducing agent.

scholarly journals Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction

2019 ◽  
Vol 9 ◽  
pp. 184798041982717 ◽  
Author(s):  
Jen Chao Ng ◽  
Chou Yong Tan ◽  
Boon Hoong Ong ◽  
Atsunori Matsuda ◽  
Wan Jefrey Basirun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Direct Methanol Fuel Cells ◽  
Precursor Solution ◽  
Nucleation And Growth ◽  
Methanol Oxidation Reaction ◽  
Reduced Graphene ◽  
Supported Palladium

In spite of advantages of direct methanol fuel cells, low methanol oxidation reaction and fuel crossover from anode to cathode, there remains a challenge that inhibits it from being commercialized. Active electrocatalysts are in high demand to promote the methanol oxidation reaction. The methanol reached at the anode can be immediately reacted, and thus, less methanol to cross to the cathode. The performance of electrocatalysts can be significantly influenced by varying the concentration of precursor solution. Theoretically, concentrated precursor solution facilitates rapid nucleation and growth; diluted precursor solution causes slow nucleation and growth. Rapid nucleation and slow growth have positive effect on the size of electrocatalysts which plays a significant role in the catalytic performance. Upon the addition of appropriate concentration of graphene oxide, the graphene oxide was reported to have stabilizing effect towards the catalyst nanoparticles. This work synthesized reduced graphene oxide–supported palladium electrocatalysts at different concentrations (0.5, 1.0, 2.0, 3.0 and 4.0 mg mL−1) with fixed volume and mass ratio of reduced graphene oxide to palladium by microwave-assisted reduction method. Results showed that reduced graphene oxide–supported palladium synthesized at a concentration of 1.0 mg mL−1 gave the best methanol oxidation reactivity (405.37 mA mg−1) and largest electrochemical active surface area (83.57 m2 g−1).

Activity and stability improvement of platinum loaded on reduced graphene oxide and carbon nanotube composites for methanol oxidation

2019 ◽  
Vol 50 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Natthapong Pongpichayakul ◽  
Paralee Waenkeaw ◽  
Jaroon Jakmunee ◽  
Suwaphid Themsirimongkon ◽  
Surin Saipanya
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Reduced Graphene Oxide ◽  
Methanol Oxidation ◽  
Reduced Graphene ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites

scholarly journals Hydrodechlorination of carbon tetrachloride with nanoscale nickeled zero-valent iron @ reduced graphene oxide: kinetics, pathway, and mechanisms

2020 ◽  
Vol 82 (4) ◽  
pp. 759-772
Author(s):  
Xiao Chen ◽  
Zhen Wang ◽  
Qi Yang ◽  
Yeyao Wang ◽  
Zhaoxiang Liu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Carbon Tetrachloride ◽  
Reduced Graphene Oxide ◽  
Bimetallic Nanoparticles ◽  
Dimensional Structure ◽  
Nickel Metal ◽  
Reduced Graphene ◽  
Supporting Material ◽  
Reaction Activation Energy

Abstract In recent years, carbon tetrachloride (CT) has been frequently detected in surface water and groundwater around the world; it is necessary to find an effective way to treat wastewater contaminated with it. In this study, Ni/Fe bimetallic nanoparticles were immobilized on reduced graphene oxide (NF@rGO), and used to dechlorinate CT in aqueous solution. Scanning electron microscopy (SEM) demonstrated that the two-dimensional structure of rGO could disperse nanoparticles commendably. The results of batch experiments showed that the 4N4F@rGO (Fe/GO = 4 wt./wt., and Ni/Fe = 4 wt.%) could reach a higher reduction capacity (143.2 mgCT/gcatalyst) compared with Ni/Fe bimetallic nanoparticles (91.7 mgCT/gcatalyst) and Fe0 nanoparticles (49.8 mgCT/gcatalyst) respectively. That benefited from the nickel metal as a co-catalyst, which could reduce the reaction activation energy of 6.59 kJ/mol, and rGO as an electrical conductivity supporting material could further reduce the reaction activation energy of 4.73 kJ/mol as presented in the conceptual model. More complete dechlorination products were generated with the use of 4N4F@rGO. Based on the above results, the reductive pathway of CT and the catalytic reaction mechanism have been discussed.

Silver, gold, and silver@gold nanoparticle-anchored l-cysteine-functionalized reduced graphene oxide as electrocatalyst for methanol oxidation

Ionics ◽  
2015 ◽  
Vol 21 (8) ◽  
pp. 2285-2293 ◽  
Author(s):  
Necip Atar ◽  
Tanju Eren ◽  
Bermali Demirdögen ◽  
Mehmet Lütfi Yola ◽  
Mustafa Oğuzhan Çağlayan
Keyword(s):  
Graphene Oxide ◽  
Gold Nanoparticle ◽  
Reduced Graphene Oxide ◽  
Methanol Oxidation ◽  
Reduced Graphene
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