摘要
采用一种快速、低成本的方法制得纳米碳材料-碳烟颗粒(C_(H)),并通过粉末冶金和机械合金化技术制备出铅/碳烟颗粒(Pb/C_(H))复合阳极材料,利用纳米碳材料高比表面积和高催化活性等优点,提高铅基阳极的析氧电催化性。使用场发射扫描电子显微镜(FE-SEM)、傅里叶红外光谱(FTIR)、循环伏安曲线(CV)和线性扫描伏安曲线(LSV)等测试进行表征。C_(H)呈疏松的球链状,具有丰富的羰基和羟基功能团,是良好的电子和质子传递载体。随着C_(H)含量增加,Pb/C_(H)复合阳极的析氧超电位降低。Pb/1.5%C_(H)(质量分数)复合阳极与纯Pb和传统Pb/0.75%Ag阳极相比,其表观交换电流密度分别提高3和2个数量级。在模拟锌电积条件下,其析氧电位低于铅银合金阳极20m V,较纯铅阳极降低133 mV,具有优异的析氧电催化活性。
A rapid and low-cost method was used to fabricate carbon nanomaterials-soot particles(C_(H)),and lead/soot(Pb/C_(H))composite anode materials were prepared by powder metallurgy and mechanical alloying techniques.Oxygen evolution of lead-based anodes was improved due to high specific surface area and catalytic activity of carbon nanomaterials.C_(H) was characterized by field emission scanning electron microscopy(FE-SEM),the Fourier infrared spectroscopy(FTIR),cyclic voltammetry curve(CV)and linear scanning voltammetry curve(LSV).Results show that C_(H) exhibits a shape of many nanosized chains with abundant carbonyl and hydroxyl groups and serve as an excellent transfer carrier of electron and proton.The overpotential of composite anodes decreases with increasing the content of C_(H) in lead/soot materials.The apparent exchange current density of the Pb/1.5wt%C_(H) composite anode is increased by 3 and 2 orders of magnitude compared to that of the pure Pb and conventional Pb/0.75wt%Ag anodes,respectively.The oxygen evolving overpotential of Pb/1.5wt%C_(H) composite anode is lower than that of the Pb/Ag anode and pure Pb anode by 20 and 133 mV,respectively,under the simulated zinc electrowinning conditions,showing excellent electrocatalytic activity of oxygen evolution.
作者
张晨沛
杨长江
赵吕兴
李灿
李启坤
常军
Zhang Chenpei;Yang Changjiang;Zhao Lvxing;Li Can;Li Qikun;Chang Jun(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Materials and Chemical Engineering,Tongren University,Tongren 554300,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第2期483-489,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51864042,51664040)
昆明理工大学分析测试基金(2021M20202202087)
贵州省高层次留学人才创新创业择优资助项目(2020)12号。
关键词
碳烟颗粒
复合阳极
析氧反应
锌电积
soot
composite anode
oxygen evolution
zinc electrowinning
