材料与冶金学报2025，Vol.24Issue(4)：349-355,7.DOI:10.14186/j.cnki.1671-6620.2025.04.005
铝电解石墨阳极电化学行为
Electrochemical behavior of graphite anode during aluminum electrolysis
摘要
Abstract
The electrochemical characteristics of graphite anodes were investigated using cyclic voltammetry to explore the relationship between alumina mass fraction and anodic passivation potential.The surface products of the anode after galvanostatic electrolysis were characterized by X-ray photoelectron spectroscopy(XPS),with subsequent analysis of intermediate reaction products and discussion on perfluorocarbon(PFC,including CF4 and C2 F6)emission mechanisms during the non-anode effect stage in aluminum electrolysis.The results demonstrate that as the alumina mass fraction increases from 0 to 3％,the anodic passivation potential rises from 2.4 V(vs.Pt)to 3.5 V(vs.Pt),indicating a significant alumina-dependent passivation behavior.Within the range of alumina mass fraction(0～3％),C-F bonds configurations and CFx groups with different structures exist on the surface of the graphite anode after electrolysis.However,at higher alumina content(3％ Al2O3),electrochemically inactive covalent C-F bonds are absent,while the percentage(mole fraction)of C-O bonds reaches 51.07％.These findings highlight the critical role of alumina mass fraction in governing PFC emissions during non-anode effect phases.关键词
铝电解/非阳极效应/PFC/C—F键Key words
aluminum electrolysis/non-anode effect/PFC/C—F bonds分类
矿业与冶金引用本文复制引用
黄义鹏,闵定伟,杨凤丽,陈功..铝电解石墨阳极电化学行为[J].材料与冶金学报,2025,24(4):349-355,7.基金项目
国家自然科学基金青年基金项目(51904123). （51904123）
