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Impedance and open circuit voltage (OCV) parameter identification is the key technology for state of health (SOH) diagnosis of lithium ion battery (LIB) in an equivalent circuit model (ECM). The current identification methods of impedance and OCV parameter are time consuming, destructive, non-real-time and costly. It is usually difficult to identify each component from the overall impedance parameter...
In this paper, the behavior of micro-scale effect in a micro direct methanol fuel cell (μDMFC) is investigated through both simulations and experiments. A model is built to describe the methanol distribution in the diffusion layer with different feature sizes. In addition, the dynamic movement of a single CO2 bubble is also simulated to study the two-phase characteristics in the micro channels with...
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 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...
In this paper, a capillary-force-based μDMFC(micro direct methanol fuel cell) supplied with pure methanol is presented. A 2D (two-dimensional) steady state model is established to investigate the methanol distribution inside the low concentration chamber with the barrier layer patterned on different diffusion materials. Simulation results illustrate that both methanol diffusion coefficient of the...
In this paper, the behavior of CO2 transmission in a micro direct methanol fuel cell (μDMFC) is investigated through both simulations and experiments. A model is built to describe the change of CO2 volume fraction in the anode channel under different operation parameters (e.g., current density, flow rate and operation temperature). In addition, the dynamic movement of a single CO2 bubble is also simulated...
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...
The reaction performance of activated Mg/CoCl2 has been studied relative to its storage time, temperature, RH (relative humidity), and storage methods. Activated Mg/CoCl2 was prepared via high-energy milling and characterised using SEM (scanning electron microscopy) and TG (thermogravimetric analysis). The samples were aged for 30 days at different RH and temperatures. Three different methods were...
Industrial parks are the economic engines for many China regions, but they also consume a great deal of energy and emit greenhouse gases. However, few empirical studies have examined these special communities. We selected SIP (Suzhou Industrial Park) as a case study. Carbon emissions from SIP were accounted from the consumption perspective to analyze their characteristics. Results showed total carbon...
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