Electrode surfaces basal plane graphite

For CdS, the Cd nanoparticles are spontaneously oxidized in the plating solution (at pH = 6 and open circuit) to Cd(OH)2. The displacement of OH by S to yield CdS can be carried out in two different ways immersion of the Cd(OH)2 in an aqueous sulfide solution (Na2S at pH = 10) [15], or by exposure of the Cd(OH)2 to gas phase H2S at 300 C [16]. In the synthesis from aqueous S , CdS particles with a mean crystal diameter between 2 and 8 nm were prepared. The nanocrystals were oriented with the c-axis of the CdS-wurtzite unit perpendicular to the electrode surface (i.e. graphite basal plane). In the gas-phase conversion, CdS/S core-shell structures were obtained by decomposition of the H2S to S on the CdS surface. 

The surface CV of anthraquinone- or its derivative-adsorbed electrode shows a reversible 2-electron-transfer redox couple. For example. Figure 7.9(A) shows the surface CV of anthraquinone-carboxlyic-allyl ester (ACAE) adsorbed on a basal plane graphite electrode surface. The pH dependent of the peak potentials gives a slope of 57 mV pH , suggesting that the redox process involves two electrons and two protons. The surface reaction reactions on the electrode surface can be assigned as Reaction (7-VI) ... 

This method involves electrochemical deposition of the MPc onto CNT-modified electrode surface by repetitive cycling in a concentrated MPc solution (1 mM) within a specific potential window. The first cyclic voltammetric scan is usually similar to subsequent scans, indicating the formation of monomeric species only. Ozoemena et al [11] found that on certain occasions, as reported recently [11] during the electro-deposition of CoTAPc onto a basal plane pyrolytic graphite electrode (BPPGE) pre-modified with SWCNT, both cathodic and anodic waves may decrease continually and then stabilizes at a certain scan (a process known as electrochemical adsorption or simply called electrosorption ). 

Kano K, Uno B (1993) Surface-redox reaction mechanism of quinones adsorbed on basal-plane pyrolytic graphite electrodes. Anal Chem 58 2009-2012. 

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