Fabrication of Nitrogen-doped Porous Electrically Conductive

Carbon Aerogel from Waste Cabbage for Supercapacitors and

Oil/water separation

Tailong Cai1, Hanwei Wang1, Chunde Jin1,2, Qingfeng Sun1,2*, Yujing Nie1,2*

1. School of Engineering, Zhejiang A & F University, Hangzhou, Zhejiang Province,

311300, PR China

2. Key Laboratory of Wood Science and Technology, Hangzhou, China

*Corresponding author: E-mail: qfsun@zafu.edu.cn (Qingfeng Sun);

nyj1986@163.com (Yujing Nie).

Figure Captions

Fig. S1. Illustration of specific elements in the Nyquist spectra.

Fig. S2 a) C1s and b) O1s spectra of the CCA-500. d) C1s and d) O1s spectra of the

CCA-600. e) C1s and f) O1s spectra of the CCA-700.

Fig. S3 CV curves of a) CCA-500 and b) CCA-700 at different scan rates. GCD

curves of c) CCA-500 and d) CCA-700 at different current densities.

Table S1. Equivalent circuit parameters obtained from the fitting results for

components of the equivalent circuit fitted with the impedance spectra.

Fig. S1. Illustration of specific elements in the Nyquist spectra.

Fig. S2 a) C1s and b) O1s spectra of the CCA-500. d) C1s and d) O1s spectra of the

CCA-600. e) C1s and f) O1s spectra of the CCA-700.

Fig. S3 CV curves of a) CCA-500 and b) CCA-700 at different scan rates. GCD

curves of c) CCA-500 and d) CCA-700 at different current densities.

Table S1. Equivalent circuit parameters obtained from the fitting results for

components of the equivalent circuit fitted with the impedance spectra.

Rs

(Ω)

Rct

(Ω)

Cdl

(μF cm-2)

Qo

(Ω-1Sncm2)

n CF

(Fg-1)

Rleak

(Ω)

6M KOH

CCA-500 0.782 1.175 139 0.7226 0.5197 83.4 786

CCA-600 0.678 0.652 133 0.1399 0.5632 223.3 1362

CCA-700 0.704 0.575 169 0.0985 0.6255 161.2 2991

EMIMBF4

CCA-600 3.864 21.71 5.42 0.0341 0.3621 103.8 1131