Electrochemical Impedance Spectroscopy of Dichlorophenols at Boron-doped Diamond Electrodes†

doi:10.7503/cjcu20150369

Abstract

Abstract:

Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) were used to investigate the electrocatalytic process of boron-doped diamond(BDD) electrode with 2,4-dichlorophenol(2,4-DCP) and 2,6-dichlorophenol(2,6-DCP) as target pollutants. Results showed that the oxidation potential of the 2,4-DCP and 2,6-DCP were 1.55 and 1.62 V, respectively. Equivalent circuit simulation results showed that the charge transfer resistance for the two DCPs were both decreased when the polarization potential increased from open circuit potential to 1.5 V, indicating that electrocatalytic oxidation was favored by increasing potential. The diffusion step was the control step at oxidation potential. The indirect electrochemical oxidation of 2,4-DCP occurred more easily at BDD electrode than 2,6-DCP.

Key words: Boron-doped diamond, Cyclic voltammetry, Electrochemical impedance spectroscopy, Dichlorophenol, Electrocatalysis

CLC Number:

O646

TrendMD:

LÜ Jiangwei, QU Youpeng, FENG Yujie, LIU Junfeng. Electrochemical Impedance Spectroscopy of Dichlorophenols at Boron-doped Diamond Electrodes^†[J]. Chem. J. Chinese Universities, 2016, 37(1): 142.

Figures/Tables 9

Fig.1 Cyclic voltammograms of BDD electrodes in 1 mmol/L 2,4-DCP+0.1 mol/L Na2SO4 and 1 mmol/L 2,6-DCP+0.1 mol/L Na2SO4 solutions

Fig.2 Bode plots of BDD electrodes in 1 mmol/L 2,4-DCP+0.1 mol/L Na2SO4 solution at different potentials

Fig.3 Nyquist plots of BDD electrodes in 1 mmol/L 2,4-DCP+0.1 mol/L Na2SO4 solution at different potentials^ (A) Open circuit potential; (B) 1.0 V; (C) 1.5 V; (D) 2.0 V; (E) 2.5 V.

Fig.4 Schematic diagram of the interface between electrode and electrolyte

Fig.5 Equivalent circuit for electrochemical impedance spectroscopy^(A) Open circuit and 1.0 V: Rs(QRct)(QscRsc); (B) 1.5 V: Rs(Q(RctZW))(QscRsc); (C) 2.0 and 2.5 V: Rs(QscRsc).

Table 1 Simulation results of BDD electrodes in 1 mmol/L 2,4-DCP+0.1 mol/L Na2SO4 solution at different potentials*

Potential/V	R_s/ (Ω·cm²)	10⁵Q-Y_sc/ (S·sⁿ·cm^-2)	Q-n_sc	R_sc/ (Ω·cm²)	10⁴Q-Y/ (S·sⁿ·cm^-2)	Q-n	R_ct/ (Ω·cm²)	10⁴Z_W/ (S·s^0.5·cm²)	10⁴Chi squared
Open circuit	64.75	2.581	0.8292	174.6	0.953	0.8066	4.275×10⁴		2.504
1.0	64.66	2.786	0.8222	180.7	1.176	0.7912	2.199×10⁴		4.127
1.5	64.05	3.552	0.7830	194.8	2.259	0.7286	2.885×10²	2.235	3.929
2.0	65.08	2.456	0.8047	85.46					0.108
2.5	67.59	2.384	0.7781	80.56					1.840

Fig.6 Bode plots of BDD electrodes in 1 mmol/L 2,6-DCP+0.1 mol/L Na2SO4 solution at different potentials

Fig.7 Nyquist plots of BDD electrodes in 1 mmol/L 2,6-DCP+0.1 mol/L Na2SO4 solution at different potentials^ (A) Open circuit potential; (B) 1.0 V; (C) 1.5 V; (D) 2.0 V; (E) 2.5 V.

Table 2 Simulation results of BDD electrodes in 1 mmol/L 2,6-DCP+0.1 mol/L Na2SO4 solution at different potentials

Potential/V	R_s/ (Ω·cm²)	10⁵Q-Y_sc/ (S·sⁿ·cm²)	Q-n_sc	R_sc/ (Ω·cm²)	10⁴Q-Y/ (S·sⁿ·cm²)	Q-n	R_ct/ (Ω·cm²)	10⁴Z_W/ (S·s^0.5·cm²)	10⁴ Chi squared
Open circuit	80.09	4.190	0.7480	235.7	0.915	0.8126	5.463×10⁴		3.524
1.0	80.01	4.168	0.7464	228.8	1.143	0.8049	1.981×10⁴		4.312
1.5	79.07	4.428	0.6757	270.7	6.330	0.8709	4.972×10³	7.753	7.975
2.0	77.39	15.720	0.5278	483.5					46.89
2.5	71.23	6.029	0.6632	154.6					13.48

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