ELECTROCHEMICAL AND SPECTROSCOPIC STUDIES OF COBALT-HEXACYANOFERRATE FILM MODIFIED ELECTRODES
ELECTROCHEMICAL AND SPECTROSCOPIC STUDIES OF COBALT-HEXACYANOFERRATE FILM MODIFIED ELECTRODES
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六氰基铁酸钴薄膜修饰电极的电化学和光谱研究
DOI：
10.1016/0013-4686(91)85193-b
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Zaofan Zhao
中科院分区：
文献类型：
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作者：
Zhiqiang Gao;Guangqing Wang;Peibiao Li;Zaofan Zhao
描述了一种新型普鲁士蓝类似六氰基铁酸钴（CHCF）薄膜修饰的玻璃碳和铂电极。通过电沉积钴将改性剂薄膜引入电极表面，随后在含有 K3Fe(CN)6 的 NaAcHAc 缓冲溶液中扫描形成 CHCF。电极表面改性剂的量可以通过改变电解时间以及Co2+和Fe(CN)3−6离子的浓度来控制。在氯化钠和氯化钾溶液中，该薄膜在电极表面电势约为+0.38 V（vs sce）时表现出近乎理想的可逆循环伏安行为。与普鲁士蓝膜修饰电极不同的是，除了K+、NH+4、Rb+、Cs+； Na+也可以在电极过程中穿过薄膜传输。他们的穆斯堡尔和XPS光谱实验结果表明，氧化还原电对不是Co(III)/Co(II)，而是Fe(III)/Fe(II)。当电极分别转移到NaCl和KCl介质中时，薄膜中含有Na+和K+。研究了电解质和溶剂对修饰电极电化学行为的影响。修饰电极在水性介质和空气中表现出优异的稳定性。该薄膜显示出电致变色性，电极过程如下：
A new type of Prussian blue analogue cobalt hexacyanoferrate (CHCF) film modified glass carbon and platinum electrodes is described. The thin film of the modifier is introduced onto the electrode surface by electrodeposition of cobalt, which forms CHCF by subsequent scanning in NaAcHAc buffer solution containing K3Fe(CN)6. The amounts of the modifier on the electrode surface can be controlled by changing the time of the electrolysis and the concentration of Co2+and Fe(CN)3−6ions. In sodium chloride and potassium chloride solutions, the film exhibits nearly ideal reversible cyclic voltammetric behaviour at the potential of about +0.38 V (vs sce) on the electrode surface. Unlike the Prussian blue film modified electrodes, besides K+, NH+4, Rb+, Cs+; Na+can also transport through the film during the electrode process. Their, Mössbauer and XPS spectroscopic experimental results show that the redox couple is not Co(III)/Co(II) but Fe(III)/Fe(II). The film contains Na+and K+when the electrode is transported into NaCl and KCl medium respectively. The influence of electrolyte and solvent on the electrochemical behaviour of the modified electrode has been examined. The modified electrode exhibits excellent stability in aqueous media and in air. The film is shown to be electrochromic and the electrode process can be presented as follows: