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A coupled electro-chemical model of a direct methanol fuel cell for portable electronic devices

机译：便携式电子设备直接甲醇燃料电池的耦合电化学模型

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摘要

Purpose - The purpose of this paper is to optimize the performance of direct methanol fuel cells forrnportable applications by combining a non-linear, fully coupled circuit model and a stochasticrnoptimization procedure.rnDesign/methodology/approach - A novel non-linear equivalent circuit that accounts forrnelectrochemical reactions and charge generation inside catalyst layers, electronic and protonicrnconduction, methanol crossover through the membrane, mass transport of reactants inside diffusionrnlayers is presented. The discharge dynamic of the fuel cell, depending on the initial methanolrnconcentration and on the load profile, is modelled by using the mass conservation equation. Thernequivalent circuit is interfaced to a stochastic optimization procedure in order to maximize the battery duration while minimizing fuel crossover.rnFindings - In the proposed circuit scheme, unlike semi-empirical models, lumped circuit parametersrnare derived directly from mass transport and electric equations in order to fully describe the dynamicrnperformance of the fuel cell. Physical and geometrical parameters are optimized in order to improve thernsystem runtime. It is shown that a combined use of fuel cells and lithium batteries can improve thernruntime of portable electronic devices compared to traditional supply systems based on lithiumrnbatteries only.rnResearch limitations/implications - The one-dimensional model of the micro fuel cell does notrntake into account possible transverse mass and electric charge flows in the fuel cell layers; most of therngeometric and physics model parameters cannot be estimated from direct in situ or ex siturnmeasurements.rnPractical implications - Direct methanol fuel cells are nowadays a promising technology forrnreplacing or complementing lithium batteries due to their high energy density. Most limiting featuresrnof direct methanol fuel cells are the fuel crossover and its slow oxidation kinetics. By using thernproposed approach, fuel cell parameters can be optimized in order to enhance the discharge runtimernand to reduce the methanol crossover.rnOriginality/value - The equivalent circuit model with optimized lumped non-linear parameters canrnbe used when designing power management units for portable electronic devices.
机译：目的-本文的目的是通过结合非线性，完全耦合的电路模型和随机优化程序来优化直接甲醇燃料电池在便携式应用中的性能。设计/方法/方法-一种新颖的非线性等效电路提出了催化剂层内部的电化学反应和电荷产生，电子和质子传导，甲醇穿过膜的穿越，反应物在扩散层内部的传质。通过使用质量守恒方程对取决于初始甲醇浓度和负载曲线的燃料电池放电动力学进行建模。等效电路与随机优化程序相连接，以使电池持续时间最大化，同时使燃料交叉最小化。rn发现-在拟议的电路方案中，与半经验模型不同，集总电路参数rn直接从质量输运和电方程中导出，以便完全描述燃料电池的动态性能。优化了物理和几何参数，以改善系统运行时间。结果表明，与仅基于锂电池的传统供电系统相比，燃料电池和锂电池的组合使用可以改善便携式电子设备的运行时间。研究限制/意义-微型燃料电池的一维模型未考虑到可能横向质量和电荷在燃料电池层中流动；大部分的几何和物理模型参数无法通过直接就地或直接测量来估算。实际意义-如今，直接甲醇燃料电池因其高能量密度而成为取代或补充锂电池的有前途的技术。直接甲醇燃料电池的最大局限性是燃料交换及其缓慢的氧化动力学。通过使用提议的方法，可以优化燃料电池参数，以延长放电时间，并减少甲醇的交叉。原始性/值-在为便携式电子设备设计电源管理单元时，可以使用具有优化集总非线性参数的等效电路模型。

著录项

  • 来源
    《Compel》 |2009年第4期|1005-1019|共15页
  • 作者

    Piergiorgio Alotto; Massimo Guarnieri; Federico Moro;

  • 作者单位

    Dipartimento di Ingegneria Elettrica, Universita di Padova, Padova, Italy;

    Dipartimento di Ingegneria Elettrica, Universita di Padova, Padova, Italy;

    Dipartimento di Ingegneria Elettrica, Universita di Padova, Padova, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electric cells; electronics; optimization techniques;

    机译：电池;电子产品;优化技术;

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