Electrochemical reduction of CO2 to CO using graphene oxide/carbon nanotube
electrode in ionic liquid/acetonitrile system
ZHU QingGong, MA Jun, KANG XinChen, SUN XiaoFu, HU JiaYin, YANG GuanYing & HAN
BuXing *
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Colloid
and Interface and Thermodynamics, Institute of Chemistry, Chinese Academy of
Sciences, Beijing 100190, P.R. China
E-mail: hanbx@iccas.ac.cn
1. As the transient current is controlled by a diffusion process of the redox system of
Fe(CN)63-/4- at GO/MWCNT-CP, Chronoamperometry is applied to study the various
catalytic and kinetic effects of the hybrid ratio. Fig. S1 shows that as the amount of
MWCNT gradually increased in the hybrid, the transient current starts to increase
from 10% and reach its maximum at 50%. However, it decreases consequently from
60% and upwards. Thus, the hybrid ratio GO/MWCNT (1:1) was selected for kinetic
study.
3.0
1:5
2:5
3:5
4:5
1:1
5:4
5:3
5:2
2.5
I (mA)
2.0
1.5
1.0
0.5
0.0
0.0
0.1
0.2
0.3
0.4
0.5
t (s)
Figure S1. Chronoamperograms of GO/MWCNT-CP with various ratio of MWCNT
to GO. The applied potential steps were 0.0 V and 0.5 V vs Ag/AgCl, respectively.
Table S1 Detail of analysis GC column on product distribution of various electrodes
in BmimBF4 (90 wt%)/MeCN at applied potential of -2.2 V vs Ag/Ag+.
Vol.
%/cm2
H2
Vol.
%/cm2
CO
Vol.
%/cm2
CH4
GO/MWCNT-CP
0.020
0.119
0.001
CP
0.039
0.085
0.000
Au
0.018
0.074
0.001
Ag
0.008
0.059
0.005
Electrodes