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硫酸溶液中电化学改性石墨电极对Fe(3+)/Fe(2+)的电催化性能与准电容特性
Alternative TitleElectrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe(3+) /Fe(2+) in H_2 SO_4 Solution
孙亚萍; 范新庄; 芦永红; 徐海波
2012
Source Publication物理化学学报
ISSN1000-6818
Volume28.0Issue:003Pages:603-608
Abstract通过循环伏安(CV)、恒电流充放电和电化学阻抗谱(EIS)等测试方法,研究了电化学改性石墨电极对硫酸溶液中Fe3+/Fe2+的电催化性能与准电容特性.结果表明:由于电化学改性石墨电极表面存在大量的含氧活性官能团,使其对Fe3+/Fe2+的氧化还原反应具有极高的电催化性能,并具有可逆反应过程特征.在含有0.5mo·lL-1Fe3++0.5mo·lL-1Fe2+的2.0mo·lL-1H2SO4溶液中,其表观面积比电容是不含铁离子硫酸溶液的1.808倍,达到2.157F·cm-2;同时,铁离子浓度的增大也能够进一步提高其电容量.Fe3+/Fe2+电对的加入增加了充放电时间,有效提高了电化学电容器(EC)的电容存储容量和高功率特性.电化学阻抗谱测试同样证实体系具有明显的电容特性.因此,可以利用电化学改性石墨电极表面的含氧活性官能团和溶液中Fe3+/Fe2+的氧化还原特性来共同储存和释放能量.
Other AbstractThe electrocatalytic performance and pseudocapacitive characteristics of a modified graphite electrode(MGE)with Fe 3+ /Fe 2+ in H 2 SO 4 solution were studied by cyclic voltammetry(CV),constant current charge-discharge measurements,and electrochemical impedance spectroscopy(EIS).The results showed that the MGE had high electrocatalytic activity and good reversible characteristics for the redox reaction of Fe 3+ /Fe 2+ because of a large quantity of oxygen-containing functional groups on the MGE surface.The apparent area-specific capacitance of the MGE in 2.0 mol·L -1 H 2 SO 4 solution containing 0.5 mol·L -1 Fe 3+ and 0.5 mo·lL -1 Fe 2+ reached 2.157 F·cm -2 ,which was almost double that in 2.0 mo·lL -1 H 2 SO 4 without Fe 3+ / Fe 2+ .Meanwhile,increasing the concentration of iron ions increased the capacitance of the MGE.The addition of Fe 3+ /Fe 2+ made the charge-discharge curves more symmetric and change more slowly,which increases the charge-discharge time,and effectively improves the capacitive energy storage and high power performance for an electrochemical capacitor(EC).The obvious capacitive characteristics were confirmed by EIS,and are attributed to the oxygen-containing functional groups on the MGE and the Faraday redox reaction of Fe 3+ /Fe 2+ in the thin electrolyte layer.Therefore,the oxygen-containing functional groups on the MGE surface and redox reaction of Fe 3+ /Fe 2+ can be used together for energy storage and release.
Keyword电化学改性石墨电极 铁离子 电催化 电化学电容 准电容
Indexed ByCSCD
Language中文
CSCD IDCSCD:4460120
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/153823
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
孙亚萍,范新庄,芦永红,等. 硫酸溶液中电化学改性石墨电极对Fe(3+)/Fe(2+)的电催化性能与准电容特性[J]. 物理化学学报,2012,28.0(003):603-608.
APA 孙亚萍,范新庄,芦永红,&徐海波.(2012).硫酸溶液中电化学改性石墨电极对Fe(3+)/Fe(2+)的电催化性能与准电容特性.物理化学学报,28.0(003),603-608.
MLA 孙亚萍,et al."硫酸溶液中电化学改性石墨电极对Fe(3+)/Fe(2+)的电催化性能与准电容特性".物理化学学报 28.0.003(2012):603-608.
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