摘要
为揭示1-乙基-3-甲基-咪唑四氟硼酸盐([Emim]BF_4)添加对PbO_2阳极形核和生长过程的影响机制,利用电化学工作站测试PbO_2在玻碳电极上沉积的电化学行为特征,包括:循环伏安曲线、计时电位曲线及计时电流曲线,并与氧化沉积的PbO_2涂层表面形貌进行对比分析。结果表明,PbO_2电沉积过程遵循三维连续成核模式,离子液体辅助时虽未明显改变PbO_2电结晶机理,但对PbO_2电沉积过程中成核和结晶长大速率均有抑制作用,其中以抑制核长大为主,从而明显地减小了PbO_2结晶颗粒尺寸,得到致密的电极表面结构,使得电化学综合性能增强。
The effect of 1-ethyl-3-methyl imidazole tetrafluoroborate（[Emim]BF4） on the nucleation and growth of PbO2 coating on glassy carbon electrode was studied during the electrodeposition process by means of in-situ cyclic voltammetry, chronopotentiometry and chronoamperometry with an electrochemical workstation. Besides, the surface morphology and crystal structure of PbO2 coating was characterized by SEM and XRD. The results show that PbO2 electrodeposition process follows the three-dimensional continuous nucleation model, the addition of ionic liquid in the electrolyte does not significantly change the electrocrystallization mechanism of PbO2, but can inhibit the nucleation and crystal growth rate of PbO2, so as to decrease the PbO2 grain size, densify the coating and enhance the electrochemical performance of the resulted PbO2 electrode.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2017年第10期765-772,共8页
Chinese Journal of Materials Research
基金
国家自然科学基金(51478379
51408468)
陕西省自然科学基金重大基础研究项目(2017ZDJC-25)
陕西省教育厅专项科研计划(16JK1422)~~
关键词
金属材料
PbO2
电沉积
形核生长
离子液体
metallic materials, Pb02, electrodeposition, nucleation growth, ionic liquid [Emim]BF4
