scholarly journals AuPt Nanoparticles Clusters on MWCNTs with Enhanced Electrocatalytic Activity for Methanol Oxidation

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 669 ◽  
Author(s):  
Changzheng Wang ◽  
Fengnan Yang ◽  
Li Gao ◽  
Shoufang Xu ◽  
Louzhen Fan ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Direct Methanol Fuel Cells ◽  
Active Surface ◽  
Oxidation Peak ◽  
Multiwalled Carbon ◽  
Peak Current ◽  
Oxidation Peak Current ◽  
Surface Areas ◽  
Direct Methanol

AuPt nanoparticles clusters (NPCs) were electrodeposited on multiwalled carbon nanotubes (MWCNTs). The as-prepared AuPt NPCs@MWCNTs nanocomposites exhibited considerably enhanced electrocatalytic activity than Pt NPs@MWCNTs for methanol oxidation in acid medium. In comparison with Pt NPs@MWCNTs, a remarkable resistance to CO poisoning and a higher If/Ib value (the ratio of the forward scan oxidation peak current (If) and reverse scan oxidation peak current (Ib)) was achieved by AuPt NPCs@MWCNTs electrocatalyst, which is attributable to the unique NPCs nanostructure with enlarged electrochemical active surface areas. These results demonstrated the potential of AuPt NPCs@MWCNTs, which can be considered as an efficient electrocatalyst for methanol oxidation in direct methanol fuel cells.

Carboxylic Graphene-Supported Platinum and Platinum-Palladium Nanoparticles with High Electrocatalytic Activity for Methanol Oxidation

2013 ◽  
Vol 320 ◽  
pp. 670-674 ◽  
Author(s):  
Qing Zhou ◽  
Guang Can Wang ◽  
Long Yang ◽  
Yun Yang ◽  
Yang Xu
Keyword(s):  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Palladium Nanoparticles ◽  
Direct Methanol Fuel Cells ◽  
Pd Nanoparticles ◽  
Catalyst Supports ◽  
Peak Current Density ◽  
Supported Platinum ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Pt, Pd and Pt-Pd nanoparticles (NPs) were synthesized on carboxylic graphene (CGR) sheets. The nanocomposites were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR) and UVvis absorption spectroscopy. Their electrocatalytic activity for methanol oxidation was also investigated. The results showed the peak current density of methanol oxidation of Pt NPs-Graphite oxide (GO), Pd NPs-CGR, Pt NPs-CGR and Pt-Pd NPs-CGR is 12.2μA/cm2, 14.1μA/cm2, 15.1μA/cm2and 21.5μA/cm2respectively. The nanocomposite of CGR as catalyst supports and Pt-Pd NPs as catalyzers is promising for direct methanol fuel cells.

scholarly journals Electrochemical antioxidant screening and evaluation based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE)

2020 ◽  
Vol 18 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Ping Tang ◽  
Xiaosheng Tang ◽  
Shiyong Mei ◽  
Yixi Xie ◽  
Liangliang Liu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Modified Glassy Carbon Electrode ◽  
Peak Current ◽  
Oxidation Peak Current ◽  
Antioxidant Capacities

AbstractIn this study, an electrochemical biosensor based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE) was developed and employed for antioxidant screening and antioxidant capacity evaluation. The oxidation peak current of guanine was improved and nearly tripled after modifications of chitosan and MoS2 nanosheet. The immobilized guanine could be damaged by hydroxyl radicals generated in Fenton solution. However, in the presence of antioxidants, the guanine was protected and the oxidation peak current of guanine increased. This process mimics the mechanism of antioxidant protection in human body. The factors affecting preparation of sensor and detection of antioxidant capacity were optimized. At the optimum conditions, the guanine/CS/MoS2/GCE showed wide linear range, low detection limit, satisfactory reproducibility and stability for detection. Ascorbic acid was used as a model antioxidant to evaluate the antioxidant capacity. A good linearity was observed with a correlation coefficient of 0.9959 in the concentrations between 0.5 and 4.0 mg L-1. The antioxidant capacities of three flavonoids were also tested and the rank of antioxidant capacities was ascorbic acid (51.84%), quercetin (45.82%), fisetin (34.39%) and catechin (16.99%). Due to the rapid measurement and low cost, this sensor could provide an available sensing platform for antioxidant screening and evaluation.

Bimetallic alloy and semiconductor support synergistic interaction effects for superior electrochemical catalysis

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4719-4728 ◽  
Author(s):  
Yunshan Zheng ◽  
Yan Zhai ◽  
Maomao Tu ◽  
Xinhua Huang ◽  
Mingcong Shu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Direct Methanol Fuel Cells ◽  
Methanol Oxidation Reaction ◽  
Electrochemical Catalysis ◽  
Anode Catalysts ◽  
Bimetallic Alloy ◽  
Direct Methanol ◽  
Methanol Fuel Cells

The design and fabrication of economically viable anode catalysts for the methanol oxidation reaction (MOR) have been challenging issues in direct methanol fuel cells (DMFCs) over the decades.

Micro Fabrication Design of a Planar Methanol Sensor

2006 ◽  
Vol 505-507 ◽  
pp. 1069-1074
Author(s):  
Shu Hao Liang ◽  
Chuen Horng Tsai ◽  
Chaug Liang Hsu
Keyword(s):  
Methanol Oxidation ◽  
Direct Methanol Fuel Cells ◽  
System Development ◽  
Electrochemical Characteristics ◽  
Front Side ◽  
Serpentine Channel ◽  
Oxidation Current ◽  
Methanol Sensor ◽  
Direct Methanol ◽  
Microfabrication Technology

This study explains a design of the microfabricated planar methanol sensor and conducts a series of methods to achieve a real device. By utilizing the microfabrication technology, it is possible to develop the miniature planar methanol sensor to integrate with direct methanol fuel cells (DMFC). The electrochemically reactive area can be adjusted effectively to obtain adequate strength of the methanol oxidation current. The innovation of the methanol sensor design is on a matrix detecting area with the in-line monitoring functions. Each detecting holes in matrix has been connected together by a serpentine channel to conduct electrochemical reaction at the surface of electrodes. In front side of wafer, the interdigitate electrode design provides a flexible adjustment in the reactive area for modulating the strength of methanol oxidation current. A compatible fabrication of methanol sensor and DMFC has also been proposed in this work. The serpentine channel and detecting holes of methanol sensor are anticipated to be made in opposite side of DMFC fuel channels. Also, the through holes have to be formed by the combination of front-side and backside Deep RIE etching. Both of them require a precise double-side alignment. At the end, a simple planar methanol sensor has been made for verifying electrochemical characteristics and the integration solution with micro DMFC has been discussed to benefit the micro DMFC system development.

Improved Methanol Oxidation Activity Through Oxidation-Induced Phase Separation of PtRu Electrocatalysts

2000 ◽  
Vol 6 (S2) ◽  
pp. 24-25
Author(s):  
R.M. Stroud ◽  
J.W. Long ◽  
K.E. Swider ◽  
D.R. Rolison
Keyword(s):  
Fuel Cells ◽  
Methanol Oxidation ◽  
Direct Methanol Fuel Cells ◽  
Ruthenium Oxide ◽  
Hydrogen Fuel ◽  
Oxidation Activity ◽  
Power Sources ◽  
Bimetallic Alloys ◽  
Point Of Use ◽  
Direct Methanol

Direct methanol fuel cells (DMFCs) offer a simpler, safer technology for point-of-use power sources compared to other hydrogen fuel cells, by avoiding the need to store hydrogen fuel or to carry out the reformation of hydrocarbons. The direct methanol oxidation electrocatalyst of choice is a nanoscale black consisting of a 50:50 atom % mixture of Pt and Ru. It has recently become known that these presumed bimetallic alloys in fact contain an array of metal, oxide and hydrous phases, which are easily misidentified in routine x-ray diffraction measurements due to particle size-broadening and poor crystallinity. By combining transmission electron microscopy, electrochemistry and thermogravimetric studies, we demonstrate here that the route to improved catalytic activity is not by phase purification of the bimetallic alloys, but instead phase engineering of hydrous ruthenium oxide and Pt mixtures.

Pt–CoP/C as an alternative PtRu/C catalyst for direct methanol fuel cells

2016 ◽  
Vol 4 (47) ◽  
pp. 18607-18613 ◽  
Author(s):  
Jinfa Chang ◽  
Ligang Feng ◽  
Kun Jiang ◽  
Huaiguo Xue ◽  
Wen-Bin Cai ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Power Density ◽  
Methanol Oxidation ◽  
Direct Methanol Fuel Cells ◽  
Direct Methanol ◽  
Methanol Fuel Cells

A novel Pt–CoP/C electrocatalyst was developed for direct methanol fuel cells. This catalyst showed superior power density to commercial Pt/C and PtRu/C catalysts. In situ ATR-SEIRAS technology revealed that the presence of CoP in the Pt-based catalyst can promote the methanol oxidation to final CO2 products.

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