High voltage supercapacitor built with seaweed carbons in neutral aqueous electrolyte

被引：489
作者：
Bichat, M. P. [1 ]
Raymundo-Pinero, E. [1 ]
Beguin, F. [1 ]
机构：
[1] Univ Orleans, CNRS, Ctr Rech Matiere Divisee, F-45071 Orleans, France
来源：
CARBON | 2010年 / 48卷 / 15期
关键词：
DOUBLE-LAYER CAPACITANCE; ACTIVATED CARBON; ELECTROCHEMICAL CAPACITORS; SURFACE OXIDES; V; PERFORMANCE; BEHAVIOR; STORAGE; ENERGY; FIBERS;
D O I：
10.1016/j.carbon.2010.07.049
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
High oxygen content (10-15 at.%) nanotextured carbons were obtained by pyrolysis of seaweeds at 600-750 degrees C and applied as electrodes for supercapacitors in H2SO4, KOH and Na2SO4 aqueous media. Interestingly, the potential stability window measured in a three-electrode cell configuration depends both on the nature of the oxygenated surface functionality and on the electrolyte pH. A high value of 2.4 V was observed in Na2SO4 for the seaweeds pyrolysed at 600 degrees C, showing that the surface functionality strongly influences the over-potentials of di-hydrogen evolution and carbon oxidation. Symmetric capacitors built from the seaweed carbons exhibited an excellent cycle life for voltage values up to 1.6 V, showing the promise of Na2SO4 for developing high energy density and environment friendly systems. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4351 / 4361
页数：11
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