Citation: SUN Ya-Ping, FAN Xin-Zhuang, LU Yong-Hong, XU Hai-Bo. Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe³⁺/Fe²⁺ in H₂SO₄ Solution[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 603-608. doi: 10.3866/PKU.WHXB201112272 shu

Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe³⁺/Fe²⁺ in H₂SO₄ Solution

1.
1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong Province, P. R. China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

Received Date: 7 November 2011
Available Online: 27 December 2011
Fund Project: 山东省博士基金(BS2010NJ018, BS2011NJ019) (BS2010NJ018, BS2011NJ019)中央高校基础科研基金(201022006)资助项目 (201022006)

The electrocatalytic performance and pseudocapacitive characteristics of a modified graphite electrode (MGE) with Fe³⁺/Fe²⁺ in H₂SO₄ 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 od reversible characteristics for the redox reaction of Fe³⁺/Fe²⁺ 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 H₂SO₄ solution containing 0.5 mol·L^-1 Fe³⁺ and 0.5 mol·L^-1 Fe²⁺ reached 2.157 F·cm^-2, which was almost double that in 2.0 mol·L^-1 H₂SO₄ without Fe³⁺/ Fe²⁺ . Meanwhile, increasing the concentration of iron ions increased the capacitance of the MGE. The addition of Fe³⁺/Fe²⁺ 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 Fe³⁺/Fe²⁺ in the thin electrolyte layer. Therefore, the oxygen-containing functional groups on the MGE surface and redox reaction of Fe³⁺/Fe²⁺ can be used together for energy storage and release.
- Modified graphite electrode,
- Iron ion,
- Electrocatalysis,
- Electrochemical capacitor,
- Pseudo-capacitance
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe3+/Fe2+ in H2SO4 Solution

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通讯作者: 陈斌, bchen63@163.com

Electrocatalytic Performance and Pseudo-Capacitive Characteristics of Modified Graphite Electrode with Fe³⁺/Fe²⁺ in H₂SO₄ Solution