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  23 Diamond-like carbon electrodes in electrochemical microgravimetry
ۼ  WizMAC ۼ  2015-07-20
÷    ȸ  11022
 

23  Diamond-like carbon electrodes in electrochemical microgravimetry

Jeong-Mi Moon, Sunkyung Park, Yeon-Kyeong Lee, Gyeong Sook Bang, Young-Kyu Hoon, Shan Park, Il Cheol Jeon. ,  Journal of Electroanalytical Chemistry Vol 46
4, Issue 2, 29 March 1999, p 230-237

 

 

Fig. 1. Cyclic voltammetric response curves for a DLC film electrode (solid line) and a glassy carbon electrode (dotted line) obtained in a CH2Cl2 solution. Scan rate: 100 mV s1. Supporting electrolyte: 0.1 M (n-Bu)4NClO4.

 

Fig. 2. CV curves of 5 mM [Ru(bpy)3]Cl2 in a 0.1 M KNO3 solution (A) at a gold electrode and (B) at a DLC electrode. Scan rate: 100 mV s1. (Inset) CV curves and the corresponding frequency change of 2 mM [Ru(bpy)3]Cl2 in a 0.05 M H2SO4 solution observed at the same time during five potential cycles between 0.8 and 1.2 V. Scan rate: 40 mV s1.

 

 

Fig. 3. (A) CV curves of [Ru(bpy)3]3:2, [Os(bpy)3]3:2 and [Fe(CN)6]3:4 showing the valid potential window of a platinum electrode (diameter1.6 mm). (B) CV curves of [Ru(bpy)3]3:2, [Os(bpy)3]3:2, [Fe(CN)6]3:4, and [Co(sep)]3:2 showing the valid potential window of a GC electrode (diameter3 mm) being between 1.2 and 1.2 V, where sep denotes the sepulchrate ligand. (C) CV curves of [Ru(bpy)3]3:2, [Os(bpy)3]3:2, [Fe(CN)6]3: 4, and [Co(sep)]3:2 showing the valid potential window of the DLC electrode (diameter5 mm), which is almost the same as the GC electrode. All the voltammograms are represented with the symbols of the metals in the complexes. Scan rate: 100 mV s1. Supporting electrolyte: 0.1 M KCl.

 

 

Fig. 4. CV curves of [Ru(bpy)3]2 in (A) a CH3CN solution and (B) a CH2Cl2 solution. Scan rate: 100 mV s1. Supporting electrolyte: 0.1 M (n-Bu)4NClO4.  


 





Fig. 5. (A) CV curve of 2 mM [Ru(bpy)3]2 at a DLC substrate electrode (diameter5 mm) and (B) the corresponding frequency response obtained simultaneously with an EQCM. Scan rate: 10 mV s1. Scan range: 1.0–1.9 V. Supporting electrolyte: 0.1 M (n- Bu)4NClO4 in CH2Cl2. (C) The SECM tip current response showing diffusion of [Ru(bpy)3]3 from the electrode surface. This figure is chosen from a set of data obtained in a separate experiment, which was performed under similar conditions as those giving (A) and (B). The tip potential was maintained at 0.8 V with the substrate potential scanning between 1.0 and 1.6 V. The tip-substrate distance was ca. 1.5 mm. Other conditions are the same as in (A). (D) The charge-potential curve obtained by integration of (A).

 

 

Fig. 6. (A) CV curve in a solution of CH2Cl2 containing 0.5 mM [Ru(bpy)3]2 and (B) the corresponding frequency response obtained. (C) The charge-potential curve obtained by integration of (A). Other conditions are the same as in Fig. 5.

 

 


 

Fig. 7. A cyclic voltammogram of a carbon microelectrode of 25 mm in diameter obtained in a dichloromethane solution of 0.5 mM [Ru(bpy)3]2. Scan rate: 100 mV s1. Supporting electrolyte: 0.1 M (n-Bu)4NClO4.

 




 


 

 
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