Evaluation of substrates for zinc negative electrode in acid PbO₂-Zn single flow batteries

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• 作者：Junli Pan¹ ; ² ; Yuehua Wen² ; ^{wen_yuehua@126.com" class="auth_mail" title="E-mail the corresponding author} ; Jie Cheng² ; Junqing Pan¹ ; ^{jqpan@mail.buct.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shouli Bai¹ ; Yusheng Yang¹ ; ²
• 关键词：Acid single flow battery ; Zinc negative electrode ; Electro-deposition ; Substrate
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：24
• 期：4
• 页码：529-534
• 全文大小：816 K

文摘

An investigation was performed on the suitability of carbon materials, metallic lead and its alloys as substrates for zinc negative electrode in acid PbO₂–Zn single flow batteries. The zinc deposition process was carried out in the medium of 1 mol·L^− 1 H₂SO₄ at room temperature. No maximum current appears on the potentiostatic current transients for the zinc deposition on lead and its alloys. With increasing overpotential, the progressive nucleation turns to be a 3D-instantaneous nucleation process for the resin-graphite composite. Hydrogen evolution on the graphite composite is effectively suppressed with the doping of a polymer resin. The hydrogen evolution reaction on the lead is relatively weak, while on the lead alloys, it becomes serious to a certain degree. Although the exchange current density of zinc deposition and dissolution process on the graphite composite is relatively low, the zinc corrosion is weakened to a great extent. With the increase of deposition time, zinc deposits are more compact. The cyclings of zinc galvanostatic charge–discharge on the graphite composite provide more than 90% of coulombic and 80% of energy efficiencies, and exhibit superior cycling stability during the first 10 cycles.