本文選題：全釩液流電池 + 釩離子�。� 參考：《工程熱物理學(xué)報(bào)》2017年03期

【摘要】：為了解決大規(guī)模蓄能全釩液流電池中傳質(zhì)不均衡而導(dǎo)致電池壽命縮短的問(wèn)題,本文建立了一個(gè)三維數(shù)值模型研究全釩液流電池中的傳質(zhì)規(guī)律。模型耦合了Nernst-Planck方程、Butler-Volmer方程、Nernst方程、質(zhì)子交換膜中的傳質(zhì)方程等。模型模擬了全釩液流電池中不同價(jià)態(tài)釩離子的分布規(guī)律,以及電解質(zhì)電流密度和電解質(zhì)電勢(shì)分布規(guī)律。研究發(fā)現(xiàn):在放電過(guò)程中,沿電解液流動(dòng)方向,反應(yīng)物的離子濃度逐漸減少,生成物的離子濃度逐漸增加;電解質(zhì)電流密度在膜表面達(dá)到最大,向兩側(cè)的集流體方向逐漸降低;沿電解液流動(dòng)方向和陰極指向陽(yáng)極方向,電解質(zhì)電勢(shì)逐漸降低。結(jié)果表明:集流體附近電化學(xué)反應(yīng)更劇烈,質(zhì)子在Nation膜中的傳遞主要是依靠電滲作用和濃差作用.
[Abstract]:In order to solve the problem that the mass transfer in large scale storage vanadium flow battery is unbalanced and the battery life is shortened, a three-dimensional numerical model is established to study the mass transfer law in the whole vanadium liquid flow battery. The model is coupled with the Nernst-Planck equation, the Butler-Volmer equation and the mass transfer equation in the proton exchange membrane. The distribution law of vanadium ions in different valence states and the distribution of electrolyte current density and electrolyte potential in a total vanadium liquid flow battery were simulated. It is found that in the discharge process, the ion concentration of reactant decreases gradually, the ion concentration of the product increases gradually, the current density of electrolyte reaches the maximum on the surface of the film, and decreases gradually in the direction of collecting fluid on both sides of the electrolyte. Along the electrolyte flow direction and the cathode direction toward the anode, the electrolyte potential decreases gradually. The results show that the electrochemical reaction near the fluid collection is more intense, and the proton transport in the Nation membrane mainly depends on the electroosmotic effect and the concentration difference.
【作者單位】： 沈陽(yáng)建筑大學(xué)交通工程學(xué)院;沈陽(yáng)建筑大學(xué)機(jī)械工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(No.51476107) 遼寧省科技廳項(xiàng)目(No.LZ2015062;No.2015020627)
【分類(lèi)號(hào)】：TM912

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