scholarly journals Fabrication of CNT Dispersion Fluid by Wet-Jet Milling Method for Coating on Bipolar Plate of Fuel Cell

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Anas Almowarai ◽  
Yutaro Ueno ◽  
Yoshiyuki Show
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Fuel Cell ◽  
Composite Film ◽  
Bipolar Plate ◽  
Milling Process ◽  
Ptfe Composite ◽  
Water Based ◽  
Milling Method ◽  
Jet Milling

Water based carbon nanotube (CNT) dispersion was produced by wet-jet milling method. Commercial CNT was originally agglomerated at the particle size of less than 1 mm. The wet-jet milling process exfoliated CNTs from the agglomerates and dispersed them into water. Sedimentation of the CNTs in the dispersion fluid was not observed for more than a month. The produced CNT dispersion was characterized by the SEM and the viscometer. CNT/PTFE composite film was formed with the CNT dispersion in this study. The electrical conductivity of the composite film increased to 10 times when the CNT dispersion, which was produced by the wet-jet milling method, was used as a constituent of the film. Moreover, the composite film was applied to bipolar plate of fuel cell and increased the output power of the fuel cell to 1.3 times.

Preparation of Polymer Composite Bipolar Plate with Different Multi-Filler for Polymer Electrolyte Membrane Fuel Cell (PEMFC)

2014 ◽  
Vol 699 ◽  
pp. 689-694 ◽  
Author(s):  
Mohd Zulkefli Selamat ◽  
Mohd Shakir Ahmad ◽  
Mohd Ahadlin Mohd Daud ◽  
Musthafa Mohd Tahir ◽  
Safaruddin Gazali Herawan
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Alternative Energy ◽  
Polymer Electrolyte Membrane ◽  
Energy System ◽  
Bipolar Plate ◽  
Filler Loading ◽  
Shore Hardness ◽  
Electrolyte Membrane

Polymer Electrolyte Membrane Fuel Cell (PEMFC) is an alternative energy system that has been verified with great potential for high power density, durability and cost effectiveness. Since the bipolar plate is the key component in PEMFC, the component must operate with multifunction and have a balance of properties, essentially well in both electrical and mechanical properties. At present, many different materials have been tested to be applied for bipolar plate in order to fulfill the balance in each property. In this work, the different material is tested and observed. Polypropylene (PP) is used as a binder material, Graphite (Gr) is used as a main filler and Carbon Black (CB), Iron (Fe) and Nickel (Ni) as the second filler. This composite is produced through compression molding and the effect of different filler material loading on the properties such as electrical conductivity, flexural strength, bulk density and shore hardness are observed. The result showed the increasing of electrical conductivity as the increased the CB and Fe loading. But for Ni, the result showed the decreasing of electrical conductivity as the loading of Ni has been increased. The targeted value also achieved for some certain degree of filler loading.

The electrical conductivity of a composite bipolar plate for fuel cell applications

Carbon ◽  
2009 ◽  
Vol 47 (10) ◽  
pp. 2413-2418 ◽  
Author(s):  
B.K. Kakati ◽  
V.K. Yamsani ◽  
K.S. Dhathathreyan ◽  
D. Sathiyamoorthy ◽  
A. Verma
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cell ◽  
Bipolar Plate

The Effects of Carbon Black Loading on the Characteristics of Carbon Composite Bipolar Plate by Utilizing Graphite Waste Products

2012 ◽  
Vol 268-270 ◽  
pp. 104-110
Author(s):  
Yunita Sadeli ◽  
Johny W. Soedarsono ◽  
Bambang Prihandoko ◽  
Sri Harjanto
Keyword(s):  
Electrical Conductivity ◽  
Renewable Energy ◽  
Fuel Cell ◽  
Flexural Strength ◽  
Carbon Black ◽  
Waste Product ◽  
Bipolar Plate ◽  
Carbon Composite ◽  
Proton Exchange ◽  
Waste Products

Current energy resources derived from fossil fuels thinning, and the issue global warning make the relevant parties that concern about the environment has been trying to find alternative renewable energy. Among the renewable energy options, the fuel cell is one of the many alternatives studied by the researchers in the world. One type of fuel cell that is currently being investigated is the proton exchange membrane fuel cell cel. The utilization of graphite and carbon black waste product is expected to result in light-weight and cost-effective bipolar plates.by using recycle materials. In this paper, we used graphite EAF as reinforcement together with carbon black that comes from the coconut husk pyrolysis process and epoxy resin as a binder. We examined the effects of carbon black loading at 5 %wt and 10 %wt, which influenced by differential pressure applied on compression molding process on density, porosity, flexural strength and electrical conductivity of the resulting polymer carbon composite bipolar plate. Pressure was applied from 30 MPa - 60 MPa in increments of 5 MPa while maintaining constant temperature operation at 70oC for 4 hours. Maximum value of bipolar plate was achieved by 5 %wt CB at application 55 MPa, density of 1.69 g/cm3, the flexural strength was measured to be 48 MPa with the porosity of 0.7%, and electrical conductivity of 1.03 S/cm.We demonstrated that waste product such as graphite EAF and carbon black are a good candidate for manufacturing of polymer carbon composite bipolar plates.

scholarly journals RECYCLING AND ITS USE IN CONCRETE WASTE PROCESSING BY HIGH-SPEED MILLING

2019 ◽  
Vol 21 ◽  
pp. 28-32
Author(s):  
Zdeněk Prošek ◽  
Pavel Tesárek ◽  
Jan Trejbal
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Dynamic Modulus ◽  
High Speed ◽  
Milling Process ◽  
Partial Replacement ◽  
Waste Processing ◽  
Structural Concrete ◽  
High Speed Milling ◽  
Milling Method

This article discusses the possibility of recycling of concrete waste using the high-speed milling method. The resulting of milling is micronize old concrete. Used old concrete was created by crushing of old concrete, which served as a structural concrete for the construction of a supporting column. Two level of milling process was used to recycle old concrete. The main use of waste is the possibility of partial replacement of commonly used binder and microfillers in concrete. For this reason, properties as particle size distribution, dynamic modulus of elasticity, flexural strength and compressive strength were observed. The aim is to replace as much cement as possible while maintaining mechanical properties.

scholarly journals Electrical Conductivity Performance of Predicted Modified Fibre Contact Model for Multi-Filler Polymer Composite

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1425 ◽  
Author(s):  
Nabilah Afiqah Mohd Radzuan ◽  
Abu Bakar Sulong ◽  
David Hui ◽  
Anil Verma
Keyword(s):  
Electrical Conductivity ◽  
Polymer Composite ◽  
Network Formation ◽  
Bipolar Plate ◽  
Contact Model ◽  
Electrical Performance ◽  
Hot Press ◽  
Compression Pressure ◽  
Milling Method ◽  
Predicted Model

Polymer composites have been extensively fabricated given that they are well-fitted for a variety of applications, especially concerning their mechanical properties. However, inadequate outcomes, mainly regarding their electrical performance, have limited their significant potential. Hence, this study proposed the use of multiple fillers, with different geometries, in order to improve the electrical conductivity of a polymer composite. The fabricated composite was mixed, using the ball milling method, before being compressed by a hot press machine at 3 MPa for 10 min. The composite plate was then measured for both its in-plane and through-plane conductivities, which were 3.3 S/cm, and 0.79 S/cm, respectively. Furthermore, the experimental data were then verified using a predicted electrical conductivity model, known as a modified fibre contact model, which considered the manufacturing process, including the shear rate and flow rate. The study indicated that the predicted model had a significant trend and value, compared to the experimental model (0.65 S/cm for sample S1). The resultant fabricated composite materials were found to possess an excellent network formation, and good electrical conductivity for bipolar plate application, when applying compression pressure of 3 MPa for 10 min.

Graphene Reinforced Composite Bipolar Plate for Polymer Electrolyte Membrane Fuel Cell

2011 ◽  
Author(s):  
Biraj Kumar Kakati ◽  
Avijit Ghosh ◽  
Anil Verma
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cell ◽  
Flexural Strength ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Hydrogen Permeability ◽  
Bipolar Plate ◽  
Bipolar Plates ◽  
Electrolyte Membrane ◽  
Electrical Conductivities

Composite bipolar plates for polymer electrolyte membrane fuel cell (PEMFC) were developed by compression molding technique using vinyl ester resin as a binder and natural graphite, carbon black, and carbon fiber as conductive reinforcements. The developed bipolar plates were characterized for electrical conductivity, flexural strength, deflection at mid-span, hydrogen permeability, and morphology. The in-plane and through-plane electrical conductivities of the composite bipolar plate (VER:25%;CB:5%;CF:5%;NG:65%) were 355.05 and 95.96 S·cm−1, respectively. The flexural strength of the same bipolar plate was 53.50 MPa with a deflection of 5.37%. The hydrogen permeability of the bipolar plate was in the order of 10−9 cm3·cm−1·s−1 at 50°C. The overall properties of the composite bipolar plate were found to achieve the benchmark set by USA-Department of Energy. However, the through-plane electrical conductivity of the above composite was edge below the target value. Therefore, graphene, being one of the most electrical conductive materials, has been reinforced into the composite bipolar plate. The results were very encouraging as 1% graphene reinforcement increased the in-plane and through-plane electrical conductivities of the bipolar plate by around 6 and 35%, respectively. The performance of a PEMFC was evaluated using the developed bipolar plate in in-situ condition.

Sinthesis and Characterization of Nd2Fe14B Powder from Nd-Fe-B Flakes by Wet Mechanical Milling and Heat Treatment

2016 ◽  
Vol 864 ◽  
pp. 70-74 ◽  
Author(s):  
Priyo Sardjono ◽  
Muljadi ◽  
Suprapedi ◽  
Nenen Rusnaeni Djauhari
Keyword(s):  
Particle Size ◽  
Mechanical Milling ◽  
Permanent Magnets ◽  
Magnetic Phase ◽  
Fine Powder ◽  
Xrd Analysis ◽  
High Energy ◽  
Milling Process ◽  
Raw Material ◽  
Milling Method

The Nyodimium-Iron-Boron (Nd-Fe-B) based materials are known as the best type of magnetic materials and it contains a magnetic phase Nd2Fe14B. The Nd-Fe-B alloy Flakes is one of the main raw material for producing of NdFeB-based permanent magnets and the size of Nd-Fe-B flakes are still coarse. Synthesis of Nd2Fe14B powder has been done by a wet mechanical milling method using the High Energy Milling (HEM) for 10 hrs and continued by heating at 600°C in vacuum condition (10-4 Pa). This process is used to produce a fine powder Nd2Fe14B for making of permanent magnets. The milling medium was used a toluene (pa-Emerck)) to protect of particle from oxidation during the milling process. After milling processes, the samples were measured distribution particle size by using Particle Size Analyzer (PSA). Microstructure analysis has been conducted by using X-ray diffractometer (XRD) and Scanning Electron Microscope (SEM/EDX) for samples before milling and sample after heating. The characterization results show that after milling 10 hours, it was obtained fine powder with average size about 1.35 μm. According to SEM/EDX and XRD analysis show that the crystal structure of the sample before milling was different compared to the sample after heating. It is found new magnetic phase with formula Nd2Fe14B.

Sign in / Sign up

Export Citation Format

Share Document