Nafion/organically modified silicate hybrids membrane for vanadium redox flow battery
Nafion/organically modified silicate hybrids membrane for vanadium redox flow battery
复制标题
DOI：
10.1016/j.jpowsour.2008.12.040
复制
发表时间：
2009-04-15
影响因子：
9.2
通讯作者：
Chen, Liquan
中科院分区：
文献类型：
--
作者：
Teng, Xiangguo;Zhao, Yongtao;Chen, Liquan
在我们之前的工作中，通过原位溶胶-凝胶法制备了Nafion/SiO2杂化膜，并将其用于钒氧化还原液流电池（VRB）系统。与含Nafion膜的VRB相比，改性Nafion膜的VRB具有很大的优势。本文以四乙氧基硅烷（TEOS）和二氧基二甲基硅烷（DEDMS）为原料，通过原位溶胶-凝胶反应制备了一种新型的Nafion/有机改性硅酸盐（ORMOSIL）杂化膜。测定了Nafion/ORMOSIL杂化膜的主要性能，并与Nafion和Nafion/SiO2杂化膜进行了比较。用紫外-可见分光光度计测定了钒离子通过Nafion/ORMOSIL杂化膜的通透性。结果表明，与Nafion膜相比，杂化膜显著减少了钒离子的交叉。傅里叶变换红外光谱（FT-IR）分析表明，杂化膜内ORMOSIL相形成良好。细胞试验表明，与Nafion和Nafion/SiO2杂交膜相比，带有Nafion/ORMOSIL杂交膜的VRB具有更高的库仑效率（CE）和能源效率（EE）。在20mA cm（-2）下，使用Nafion/ORMOSIL杂交膜的VRB的最高EE为87.4%。而在相同电流密度下，含Nafion的VRB的EE和含Nafion/SiO2杂化膜的VRB的EE分别仅为73.8%和79.9%。经过100次（60mA cm(-2)）以上循环后，naion /ORMOSIL杂交膜的CE和EE几乎没有衰减，证明了naion /ORMOSIL杂交膜在强酸溶液中长期充放电过程中具有很高的化学稳定性。在Nafion、Nafion/SiO2和Nafion/ORMOSIL复合膜的VRB中，采用Nafion/ORMOSIL复合膜的VRB自放电速率最慢，进一步证明了所制备的复合膜具有优异的钒离子阻断特性。(c) 2008 Elsevier B.V.版权所有
In our previous work, Nafion/SiO2 hybrid membrane was prepared via in situ sol-gel method and used for the vanadium redox flow battery (VRB) system. The VRB with modified Nafion membrane has shown great advantages over that of the VRB with Nafion membrane. In this work, a novel Nafion/organically modified silicate (ORMOSIL) hybrids membrane was prepared via in situ sol-gel reactions for mixtures of tetraethoxysilane (TEOS) and diethoxydimethylsilane (DEDMS). The primary properties of Nafion/ORMOSIL hybrids membrane were measured and compared with Nafion and Nafion/SiO2 hybrid membrane. The permeability of vanadium ions through the Nafion/ORMOSIL hybrids membrane was measured using an UV-vis spectrophotometer. The results indicate that the hybrids membrane has a dramatic reduction in crossover of vanadium ions compared with Nafion membrane. Fourier transform infrared spectra (FT-IR) analysis of the hybrids membrane reveals that the ORMOSIL phase is well formed within hybrids membrane. Cell tests identify that the VRB with Nafion/ORMOSIL hybrids membrane presents a higher coulombic efficiency (CE) and energy efficiency (EE) compared with that of the VRB with Nafion and Nafion/SiO2 hybrid membrane. The highest EE of the VRB with Nafion/ORMOSIL hybrids membrane is 87.4% at 20mA cm(-2). while the EE of VRB with Nafion and the EE of VRB with Nafion/SiO2 hybrid membrane are only 73.8% and 79.9% at the same current density. The CE and EE of VRB with Nafion/ORMOSIL hybrids membrane is nearly no decay after cycling more than 100 times (60mA cm(-2)), which proves the Nafion/ORMOSIL hybrids membrane possesses high chemical stability during long charge-discharge process under strong acid solutions. The self-discharge rate of the VRB with Nafion/ORMOSIL hybrids membrane is the slowest among the VRB with Nafion, Nafion/SiO2 and Nafion/ORMOSIL membrane,which further proves the excellent vanadium ions blocking characteristic of the prepared hybrids membrane. (c) 2008 Elsevier B.V. All rights reserved.