Electrochemical Reduction Effects on the Morphology and Electrochemical Capacity of Carbon Paper

doi:10.7503/cjcu20150724

Abstract

Abstract:

We studied the changes in the morphology and electrochemical capacity of carbon paper caused by the electrochemical reduction. SEM images show that the electrochemical reduction caused the decomposition of reduced carbon papers(rCPs) into carbon particles and rough surface. Raman spectra show the surface disorder as evidenced by higher I_D/I_G ratio for treating time as short as 1 min. BET tests reveal the markedly increased specific surface area caused by the electrochemical reduction of carbon paper. XPS analyses show a higher quantity of surface hydroxyl species(C—OH) on rCPs. The capacitance of rCP(treated at -1.6 V for 5 min) is 15 times that of the pristine carbon paper, and this outstanding capacitance is rather stable even after prolonged charge-discharge 1500 cycles.

Key words: Carbon paper, Electrochemical reduction, Capacitance, Stability

CLC Number:

O646

TrendMD:

YAN Pengli, LI Ailong, ZHANG Bingqing, SHI Jingying, GAN Yang, LI Can. Electrochemical Reduction Effects on the Morphology and Electrochemical Capacity of Carbon Paper[J]. Chem. J. Chinese Universities, 2015, 36(11): 2304.

Figures/Tables 6

Fig.1 FESEM images of CP(A) and rCP reduced at -1.6 V for 10 min(B) Insets are the FESEM images with higher magnification.

Fig.2 XRD patterns(A) and Raman spectra(B) of CP(a) and rCPs reduced at -1.6 V for 1 min(b), 5 min(c) and 10 min(d)

Fig.3 Deconvoluted C1s XPS spectra of CP(A) and rCPs reduced at -1.6 V for 1 min(B), 5 min(C) and 10 min(D)

Fig.4 Plots of the interfacial capacitance(solid symbol) and specific capacitance(hollow symbol) of CP and rCP(A) and plots of the interfacial capacitance versus the cycle numbers for CP and rCP(B)

Fig.5 CV curves(A) and charge-discharge performance(B) of CP(a) and rCPs reduced at -1.6 V for 1 min(b), 5 min(c) and 10 min(d) (A) Scan rate 100 mV/s; (B) current density is 10 μA/cm2, except that of rCP reduced for 10 min is 100 μA/cm2.

Fig.6 Nyquist plots for CP and rCPs(A), evolution of the real part(B) and imaginary capacitance(C) vs. frequency for CP and rCPs a. CP; b. rCP reduced at -1.6 V for 5 min; c. rCP reduced at -1.6 V for 10 min.

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