Bifunctional N-Doped Tungsten Trioxide Microspheres as Electrode Materials for Lithium-Ion Batteries and Direct Methanol Fuel Cells

2020 ◽  
Vol 124 (39) ◽  
pp. 21261-21267
Author(s):  
Xiaolin Li ◽  
Shengda Guo ◽  
XianChao Hu ◽  
Dong Li ◽  
Zhiliang Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Lithium Ion Batteries ◽  
Tungsten Trioxide ◽  
Electrode Materials ◽  
Direct Methanol Fuel Cells ◽  
Lithium Ion ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Combinatorial Screening of Anode and Cathode Electrocatalysts for Direct Methanol Fuel Cells

1998 ◽  
Vol 549 ◽  
Author(s):  
Epok Reddington ◽  
Jong-Sung Yu ◽  
Anthony Sapienza ◽  
Benny C. Chan ◽  
Bogdan Gurau ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Electrode Surface ◽  
Noble Metals ◽  
Electrode Materials ◽  
Direct Methanol Fuel Cells ◽  
Screening Method ◽  
Cathode Side ◽  
Eosin Y ◽  
Direct Methanol ◽  
Methanol Fuel Cells

AbstractProgress in several important electrochemical technologies, including batteries, fuel cells, sensors, and electrosynthesis, is currently materials-limited. A common feature of all electrode reactions is the imbalance (i.e., loss or generation) of ions at the electrode surface. We describe in this paper a method by which excess ions in the electrode diffusion layer can be imaged, and used to identify the best electrode materials from a combinatorial array of compositions.Although in principle this method can be applied to many electrochemical problems, we have focused on finding better electrocatalysts for direct methanol fuel cells (DMFCs). The DMFC performs two half-cell reactions: oxidation of methanol, and reduction of oxygen. Two of the most important problems in DMFCs are the poor performance of the electrocatalysts, and the crossover of methanol from the anode to the cathode side of the cell. An ideal situation would be the simultaneous development of two new catalysts: an anode that oxidizes methanol at low overpotential, and a “methanol-tolerant” cathode that reduces oxygen without oxidizing methanol.Based on previously developed rules for predicting the activity of ternary alloy catalysts (Ley, et al., J. Electrochem. Soc. 1997, 144, 1543), we began searching quaternary combinations of noble metals for the anode, and ruthenium selenide-type materials for the cathode reaction. The anode and cathode reactions generate and consume protons, respectively, creating a substantial pH gradient at the electrode surface. Changes in local pH are imaged by means of an appropriate fluorescent indicator: Ni-PTP for the anode and Eosin Y for the cathode. DMFC testing confirms the utility of the screening method, in that a Pt/Ru/Os/Ir quaternary catalyst was substantially superior to the best binary and ternary catalysts prepared under similar conditions.

scholarly journals Electrochemical and quantum chemical study of peculiarities of 2,5-di-Me-pyrazine-di-N-oxide oxidation in the presence of methanol at single-walled and multi-walled carbon nanotube paper electrodes

2022 ◽  
Author(s):  
Svetlana Ivanovna Kulakovskaya ◽  
Alexander V. Kulikov ◽  
Tatiana Zyubina ◽  
Alexandr Zyubin ◽  
Liana N Sviridova ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Carbon Nanotube ◽  
Quantum Chemical ◽  
Electrode Materials ◽  
Direct Methanol Fuel Cells ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Multi Walled Carbon Nanotube ◽  
Direct Methanol ◽  
Methanol Fuel Cells

The use of methanol (MeOH) in direct methanol fuel cells explains the interest in the search for new electrode materials and catalysts that allow the oxidation of MeOH to be...

Nanosized Composite Electrodes Based on Polyaniline/Carbon Nanotubes Towards Methanol Oxidation

2019 ◽  
Vol 15 (6) ◽  
pp. 654-668
Author(s):  
Muge Civelekoglu-Odabas ◽  
Ipek Becerik
Keyword(s):  
Carbon Nanotubes ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Metal Nanoparticles ◽  
Electrode Materials ◽  
Direct Methanol Fuel Cells ◽  
Composite Electrodes ◽  
Multi Wall Carbon Nanotubes ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Background: Direct methanol fuel cells as a clean and efficient energy conversion method for portable electronic devices and electric vehicles are a very popular subject in science and engineering. Up to now, the most effective anode electrode materials for direct methanol fuel cells are Pt- Ru, used mainly as bimetallic catalysts dispersed on a highly active conductive support, such as conducting polymer, carbon-based catalysts, or a composite matrix composed of both. Objective: The main objective is to decrease the amount of precious metal-Pt required for financial considerations and to overcome the insufficient oxidation reactions’ rate of the fuel, which lead to the inevitable, naturally high, overpotential in fuel cell applications. Thereby, current research addresses the preparation of Pt, Pt-Ru, Pt-Ru-Pd and Pt-Ru-Mo metal nanoparticles modified by both polyaniline-multi-wall carbon nanotubes and polianiline-functionalized multi-wall carbon nanotubes composites and their activity in the methanol electro-oxidation. Methods: All of the composite surfaces were successfully prepared using electrochemical methodologies. A Citrate method was used for the preparation of metal nanoparticles. A comparative study was conducted on each stage of the investigation. The modified surfaces were characterized and analyzed by SEM, EDX, XRD, Raman, and TEM. Results: According to the spectroscopic measurements, all particles synthesized were detected as nanoscale. Binary and ternary catalysts supported on composite surfaces had higher activity and efficiency when compared to monometallic systems. Conclusion: The fabricated electrodes showed comparable catalytic activity, long-term stability, and productivity towards direct methanol fuel cell applications in acidic media.

Progress and Perspectives in Passive Direct Methanol Fuel Cells Operating with Concentrated Methanol

2012 ◽  
Vol 7 (3) ◽  
pp. 1-7
Author(s):  
Naveen K. Shrivastavaa ◽  
◽  
Shashikant B. Thombreb ◽  
Kailas L. Wasewar ◽  
◽  
...  
Keyword(s):  
Fuel Cells ◽  
Direct Methanol Fuel Cells ◽  
Direct Methanol ◽  
Methanol Fuel Cells
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