The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents an arrangement of super hydrophobic lateral venting micro channels, which is fabricated around the anode gas diffusion electrode of micro direct methanol fuel cell (μDMFC). Work in this paper is aimed to prove the validity of the lateral venting design. Three types of DMFCs with lateral venting design is tested by contrast with control groups respectively. With the lateral venting...
A bipolar passive direct methanol fuel cell (DMFC) stack for portable applications is designed, fabricated and tested. Stainless steel sheet is chosen to fabricate the current collectors by using the traditional wire cutting and laser beam cutting techniques. A 3.5 μm Au layer is deposited on the current collectors using electroplating method to prevent electrochemical corrosion. A novel design of...
Low temperature power generation system based on organic Rankine cycle (ORC) has been a popular candidate for low grade heat utilization and recovery. To find a way to predict the performance of the ORC system, the exploration and analyses of the Support Vector Machine (SVM) and Back Propagation Artificial Neural Network (BP-ANN) were carried out. For comparison, both Gauss Radial Basis kernel function...
Micro Direct Methanol Fuel Cell (μDMFC) has been a promising new type of portable energy device due to its high energy density, quick start features and simple operation environment. Water management is one of the most crucial problems for hindering the development of passive μDMFC. A novel cathode structure of passive μDMFC controlling water management and increasing methanol concentration is proposed...
This paper develops a passive direct methanol fuel cell (DMFC) structure employing the graphite plate as the porous medium in order to increase the energy density and the stable operating time of the cell. A two-dimensional model of the proposed DMFC is developed to determine the appropriate thickness of the graphite plate and the optimum feed concentration of the methanol. The simulated polarization...
In this work, an active micro direct methanol fuel cell (μDMFC) system employing the catalytic combustor as the heating device is developed in order to maintain the optimum cell temperature and achieve the best cell performance. A passive feed method, combining both the saturator and the wick, is adopted to supply sufficient methanol into the micro combustor. The feasibility and the superiorities...
In this paper, a systemic model based on the equivalent circuit modeling method is developed in order to analyze the electrical behavior of direct methanol fuel cell (DMFC) stack in complex systems. The systemic model consists of the polarization curve subsystem, the long time discharge subsystem, and the temperature distribution of catalyst layer subsystem. The effect of various operating parameters...
In this paper, the gradient AGDL (anode gas diffusion layer) is applied to prompt the methanol/CO2 transport, and improve the performance of the μDMFC (micro direct methanol fuel cell). A two-dimensional, two-phase model coupled with mass/momentum transports and hydrophobic characteristic is first established, with the methanol concentration distribution, CO2 volume fraction, and the polarization...
In this paper, a novel anode mass transfer barrier layer was developed for μ-DMFC (micro direct methanol fuel cell) to decrease methanol crossover. The novel barrier layer was a composite material of SSFF (stainless steel fiber felt) and rGO (reduced graphene oxide), which was prepared by dipping a piece of SSFF plate into graphene oxide solution and subsequently experiencing a reduction process....
In this paper, a novel self-adaptive anode feeding pattern is introduced to optimize the output and the dynamic response of the μDMFC (micro direct methanol fuel cell). The RSM (response surface methodology) is applied to optimize the anode flow rate, with two input parameters considered in this study, i.e., the methanol concentration and the operating current. In addition, the hardware circuit of...
The objective of this work is to investigate the energy saving potential of HTHP&DW (high temperature heat pump coupling to desiccant wheel) system by means of comparative analysis based on reference technologies. A complete numerical model of HTHP&DW system is established and the iterative algorithm is successfully applied and tested. The energy consumption, COP (coefficient of performance)...
A “4-cell” modular passive DMFC (direct methanol fuel cell) stack, which can be freely combined and applied to various electronic devices, is designed, fabricated and tested. Two PCB (printed circuit board) based accessories are designed and fabricated for electrically connecting and mechanically assembling the “4-cell” modules. The maximum power density of the “4-cell” module is 27 mW cm −2 ...
A novel MEA (membrane electrode assembly) structure of passive μ-DMFC (micro-direct methanol fuel cell) controls water management and decreases methanol crossover. The CNT (carbon nanotube) paper replacing CP (carbon paper) as GDL (gas diffusion paper) enhances water back diffusion which passively prevents flooding in the cathode and promotes low methanol crossover. Moreover, the unique structure...
In this paper, the response surface methodology is applied to optimize the operating conditions of μDMFC (micro direct methanol fuel cell). Three operating parameters, the methanol flow rate, the methanol concentration and the cell temperature are considered in this study, and the ranges of them are 0.5–1.5 ml min−1, 0.5–2.0 mol L−1 and 20–60 °C respectively. The individual effects of these operating...
In this paper, a μDMFC (micro direct methanol fuel cell) with high performance was fabricated by adopting aluminum alloys as a substrate for the first time. PEO (plasma electrolytic oxidation) was adopted to prepare an oxide coating on the substrate to make it electrically non-conductive and corrosion resistant. The PEO-treated substrate shows excellent corrosion resistance in the simulated DMFC environment...
A two-dimensional, non-isothermal model is presented for a small passive direct methanol fuel cell (DMFC) in vertical operation. The effect of natural convection at the anode in the fuel reservoir is considered. The coupled heat and mass transport of the whole cell, along with the electrochemical reactions occurring in the passive DMFC are modeled. The comprehensive model is solved numerically by...
The objective of this paper is to investigate the performance characteristics of μDMFC (micro direct methanol fuel cell) using a novel concept of self-adaptive anode feeding pattern, which can be controlled by detecting the operating current. A comprehensive analysis, including polarization curve, methanol permeation current, mass transport efficiency and CO 2 volume fraction, is conducted...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.