scholarly journals NiCo Nanoneedles on 3D Carbon Nanotubes/Carbon Foam Electrode as an Efficient Bi-Functional Catalyst for Electro-Oxidation of Water and Methanol

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 500
Author(s):  
Tung Ngoc Pham ◽  
Ajaikumar Samikannu ◽  
Solomon Tesfalidet ◽  
Thomas Wågberg ◽  
Jyri-Pekka Mikkola
Keyword(s):  
Carbon Nanotubes ◽  
Methanol Oxidation ◽  
Current Density ◽  
Oxidation Reaction ◽  
Direct Methanol Fuel Cells ◽  
High Current Density ◽  
Water Electrolysis ◽  
Carbon Foam ◽  
Methanol Oxidation Reaction ◽  
Testing Time

In this study, we report a 3D structured carbon foam electrode assembled from a bi-functional NiCo catalyst, carbon nanotubes (CNT), and a monolith 3D structured carbon foam (CF) as a highly active and stable electrode for oxygen evolution reaction (OER) and methanol oxidation reaction (MOR). When the NiCo@CNTs/CF electrode was used as an anode in OER, after the anodization step, the electrode required a small overpotential of 320 mV to reach the current density of 10 mA cm−2 and demonstrated excellent stability over a long testing time (total 30 h) in 1 M KOH. The as-prepared NiCo@CNTs/CF electrode also exhibited a good performance towards methanol oxidation reaction (MOR) with high current density, 100 mA cm−2 at 0.6 V vs. Ag/AgCl, and good stability in 1 M KOH plus 0.5 M CH3OH electrolyte. The NiCo@CNTs/CF catalyst/electrode provides a potential for application as an anode in water electrolysis and direct methanol fuel cells.

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.

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).

The effect of PtRuW ternary electrocatalysts on methanol oxidation reaction in direct methanol fuel cells

2010 ◽  
Vol 27 (3) ◽  
pp. 802-806 ◽  
Author(s):  
Dae Kyu Kang ◽  
Chang Soo Noh ◽  
Sang Tae Park ◽  
Jung Min Sohn ◽  
Seung Kon Kim ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Direct Methanol Fuel Cells ◽  
Methanol Oxidation Reaction ◽  
Direct Methanol ◽  
Methanol Fuel Cells

The Electrolyte-Fuel Concentrations Effects on Direct Methanol Alkaline Fuel Cell (DMAFC) Through Non-Noble Metal Catalysts

2021 ◽  
Vol 5 (1) ◽  
pp. 25
Author(s):  
Wika Atro Auriyani ◽  
Djoni Bustan ◽  
Sri Haryati
Keyword(s):  
Fuel Cell ◽  
Methanol Oxidation ◽  
Current Density ◽  
Potassium Hydroxide ◽  
Oxidation Reaction ◽  
Nickel Foam ◽  
Methanol Oxidation Reaction ◽  
Alkaline Fuel Cell ◽  
Noble Metal Catalysts ◽  
Direct Methanol

Most of the R&D on Direct Methanol Alkaline Fuel Cell (DMAFC) concentrates on electrode catalyst and appropriate electrolyte to improve the efficiency. Mostly, a Pt-based electrocatalyst was used. In this research, Nickel foam and membrane silver as non-noble metal catalysts were used in a square-shaped fuel cell stack of 15 x 15 cm in size. The ionic current in the Direct Methanol Alkaline Fuel Cell (DMAFC) was due to the conduction of hydroxide ions. Potassium hydroxide which plays an essential role in delivering hydroxide ions was used in this study. The electrolyte effect of potassium hydroxide was studied in different concentrations for the methanol oxidation reaction. Nickel foam and membrane silver were used for methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). 1 M, 3 M, 5 M concentration of potassium hydroxide and 0.5 M, 1 M, 2 M, 3 M, 4 M, 5 M of methanol as a fuel have been conducted. The highest maximum power density of 543.35 mW/cm2 was obtained at 2,331 mA/cm2 of current density using the 5 M KOH and 0,5 M fuel. At equimolar concentration between fuel-electrolyte mixture give the higher current density.

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