Chemical modification and electrochemical behaviour of graphite fibre in acidic vanadium solution
Chemical modification and electrochemical behaviour of graphite fibre in acidic vanadium solution
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DOI：
10.1016/0013-4686(91)85135-t
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发表时间：
1991
影响因子：
6.6
通讯作者：
Bianting Sun;M. Skyllas-Kazakos
中科院分区：
文献类型：
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作者：
Bianting Sun;M. Skyllas-Kazakos
在97%H_2SO_4溶液中，用缓慢线性电位扫描法对石墨纤维电极进行电化学氧化和部分还原，然后用含Pt ~（4+）、Pd ~（2+）、Au ~（4+）、Mn ~（2+）、Te ~（4+）、In ~（3+）和Ir ~（3+）的溶液进行浸渍或离子交换，制备剩余氧化石墨纤维（rGo纤维）。在酸性硫酸钒溶液中的循环伏安测试表明，Pt ~（4+）修饰电极的电化学行为与Pt电极一致。在Pt、Pd和Au修饰的电极上获得了高的析氢速率，而由Ir 3+修饰的电极对各种钒氧化还原物种表现出最好的电化学行为。经Mn ~（2+）、Te ~（4+）和In ~（3+）处理的纤维电极的循环伏安行为与未处理的纤维电极相似，电化学活性明显提高。
Residual graphite oxide fibres (rGo fibres) were prepared by electrochemical oxidation and partial reduction of a graphite fibre electrode with a slow linear potential sweep in 97% H2SO4solution and then metallized by impregnation or ion-exchange with solutions containing Pt4+, Pd2+, Au4+, Mn2+, Te4+,In3+and Ir3+. The cyclic voltammetry of the modified electrode in an acidic vanadium sulphate solution showed that the electrode modified by Pt4+exhibited electrochemical behaviour consistent with a Pt electrode in the same solution. High hydrogen evolution rates were obtained on Pt, Pd, and Au modified electrodes while the electrode modified by Ir3+exhibited the best electrochemical behaviour for the various vanadium redox species. The electrodes treated with Mn2+, Te4+and In3+gave similar cyclic voltammetric behaviour with significantly improved electrochemical activity compared with the untreated fibre electrode.