A highly efficient performance of C3N4/In2O3/BiVO4 photoelectrode as anticorrosion system of metals Ahmed Helal, S M El-Sheikh, Alaa I. Eid, S A El-haka, S E Samra, Jianqiang Yu
Graphical Abstract
Problem Solving
Pitting Corrosion
Microbial corrosion
The model of PEC cathodic protection for metal by photoanode.
Results
Experimental g-C3N4 NH4Cl/g-C3N4 = 2 NH4Cl/g-C3N4 = 4
Intensity [a. u.]
Intensity [a. u.]
50%CN/In2O3/BiVO4
40%CN/In2O3/BiVO4
30%CN/In2O3/BiVO4
20%CN/In2O3/BiVO4
Drying
Calcination at 450Co for 2h
10%CN/In2O3/BiVO4
10
20
30
40
50
60
70
80
10
2-Theta-Degree
40
50
60
70
80
XRD patterns of In2O3/BiVO4 samples with a different weight percent of g-C3N4.
100
Stacked g-C3N4
[1]
30
2-Theta-Degree
XRD patterns of NRCNNS samples with different NH4CL ratio.
Preparation of exfoliated G-C3N4
20
90 80
In2O3/BiVO4
10% G-CN/In2O3/BiVO4
20% G-CN/In2O3/BiVO4
30% G-CN/In2O3/BiVO4
40% G-CN/In2O3/BiVO4
50% G-CN/In2O3/BiVO4
Current /A.cm
-2
70
Exfoliated g-C3N4
60 50 40 30 20
SEM for 30% g-C3N4 /In2O3/BiVO4 composite.
10 0 0
200
400
600
800
1000
Time / Sec
Chronoamperometric measurement for In2O3/BiVO4 composite and after adding g-C3N4.
Photocathodic protection Light off
Polarization potential
Corroded Steel
-50
-0.5
-0.5
Protected BiVO4
-100
-1.0 2
In2O3/BiVO4
a
Steel BiVO4 light off
-200
ICorr
-1.5
-2.0
-250
Steel
-1.0
Log i mA.cm
-150
In2O3/BiVO4 light off
In2O3/BiVO4 light on
Log i mA.cm
E (mV vs. Ag/AgCl)
BiVO4 light on
2
Light on
0
-1.5
ICorr
-2.0
G-C3N4/In2O3/BiVO4
-300
ECorr
-2.5
ECorr
-2.5 -750
-350
-700
-650
-600
-550
-500
-450
-400
-350
-700
Potential (mV) vs Ag/Agcl
-650
-600
-550
-500
-450
-400
Potential (mV) vs Ag/Agcl
1000
2000
3000
4000
5000
-480
Time/ Sec
-0.5
-500
G-C3N4/In2O3/BiVO4 light off -1.0 2
4
40
-1.5
ICorr
-1.4
-580 -1.5
-600 -620
-2.0
3 -Z''/k
-Z''/k
a
-560
E Corr
Log i mA.cm
b 60
-1.3
-540
5
Steel
-1.2
ECorr
ICorr
-520
Open circuit potential for 304 SS coupled with prepared samples under solar light and dark conditions
80
-1.1
G-C3N4/In2O3/BiVO4 light on
Steel
ICorr
0
-1.6
-640 -1.7
ECorr
-2.5
2
-660 -680 Bi VO 4 D ar k
/B iV O 4 D ar k O 2
In
3
St ee l
/B iV O 4 D ar k 3
t
O
G /In
/B iV O 4 L ig h 3
O 2
In
G /In
In2O3/BiVO4
2
t
-1.8 /B iV O 4 L ig h
Potential (mV) vs Ag/Agcl
-450
3
-500
t
-550
O
BiVO4
1
-600
2
20
-650
Bi VO 4 L ig h
-700
G-C3N4/ In2O3/BiVO4
0
0 0
5
10
15
20
25
30
35
40
0
Z'/k
2
4
6
8
Z'/k
Nyquist plots of pure 304SS electrode, b) 304 SS coupled with Synthetic material electrode under illumination of solar light
Conclusion 1.
The produced materials shows a good performance in the cathodic photoreduction
2. References:
304 stainless steel would be protected via connected to In2O3/BiVO4 composite during sunlight illumination.
[1] J. Yan et al., Colloids Surfaces A Physicochem. Eng. Asp., vol. 508, pp. 257–264, 2016.
3.
Addition of G-C3N4 shows extra protection in the absence of sunlight.
4.
G-C3N4 work as electrons reservoir, which keep the electrons during
[2] X. Wang et al., Nat. Mater., vol. 8, no. 1, pp. 76–80, 2009. [3] J. Li, C. J. Lin, J. T. Li, and Z. Q. Lin, Thin Solid Films, vol. 519, no. 16, pp. 5494–5502, 2011. [4] H. Yun, C. Lin, J. Li, J. Wang, and H. Chen, Appl. Surf. Sci., vol. 255, no. 5 PART 1, pp. 2113–
day and injected it at night.
2117, 2008
Acknowledgement This work is financially supported by the Talented Young Scientist Program, Chinese Science and Technology; National Natural Science Foundation of China for Youths (No. 21407065, 21506079), Natural Science Foundation of Shandong Province (No. ZR2016BM08). www.postersession.com www.postersession.com