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Acta Metall Sin  2019, Vol. 55 Issue (10): 1302-1310    DOI: 10.11900/0412.1961.2019.00054
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Nanoporous Silver via Electrochemical Dealloying and Its Superior Detection Sensitivity to Formaldehyde
YANG Yulin1,MU Zhangyan1,FAN Zheng1,DAN Zhenhua1,2(),WANG Ying2,CHANG Hui1
1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Iron and Steel Group Corporation, Anshan 114021, China
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Abstract  

Nanoporous silver (NPS) with high specific surface area has a great potential application in efficient formaldehyde detection. In this work, NPS was prepared by potentiostatic or galvanostatic electrochemical dealloying of Ag30Zn70 precursor alloys. The results reveal that applied potential or current has a significant influence on the composition, morphology and nanoporous structure of NPS. A bi-continuous NPS with an average pore size of 80 nm was obtained by electrochemical dealloying in 0.1 mol/L HCl solution at a constant current density of 2.5 mA/cm2 for 6000 s. The cyclic voltammetry experiment results showed that NPS has a superior formaldehyde catalysis and detection abilities in 0.5 mol/L KOH solution due to the optimal combination of nanopores and Ag ligaments in nanoporous structure. The higher formaldehyde catalysis and detection abilities were exhibited at the NPS with smaller nanopores. The detection sensitivity of formaldehyde in NPS with the pore size of 80 nm was 0.22 mA·cm-2·(mmol·L-1)-1 in the concentration range of 10~100 mmol/L, and the peak current density was 25.0 mA/cm2 in 0.5 mol/L KOH solution with 100 mmol/L HCHO.

Key words:  electrochemical dealloying      nanoporous silver      formaldehyde detection      cyclic voltammetry     
Received:  28 February 2019     
ZTFLH:  TG146  
Fund: Supported by National Defense Basic Scientific Research Program of China(JCKY08414C020);Top-Notch Academic Programs Project of Jiangsu Higher Education Institutions(PPZY2015B128);State Key Laboratory of Metal Material for Marine Equipment and Application(HG-SKL(2018)06)
Corresponding Authors:  Zhenhua DAN     E-mail:  zhenhuadan@njtech.edu.cn

Cite this article: 

YANG Yulin, MU Zhangyan, FAN Zheng, DAN Zhenhua, WANG Ying, CHANG Hui. Nanoporous Silver via Electrochemical Dealloying and Its Superior Detection Sensitivity to Formaldehyde. Acta Metall Sin, 2019, 55(10): 1302-1310.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00054     OR     https://www.ams.org.cn/EN/Y2019/V55/I10/1302

Fig.1  Transient changes of response current density of electrochemical dealloying of Ag30Zn70 alloy with different applied potentials in 0.1 mol/L HCl solution with 1 g/L PVP
Fig.2  XRD spectra of Ag30Zn70 original alloys and after electrochemical dealloying with different potentials in 0.1 mol/L HCl solution with 1 g/L PVP
Fig.3  Low (a, c, e, g) and high (b, d, f, h) magnified SEM images of Ag30Zn70 alloys after electrochemical dealloying with applied potentials of 0.10 V (a, b), 0.15 V (c, d), 0.20 V (e, f) and 0.30 V (g, h) in 0.1 mol/L HCl solution with 1 g/L PVP
Fig.4  Transient changes of potential of electrochemical dealloying of Ag30Zn70 alloy with different current densities in 0.1 mol/L HCl solution
Fig.5  XRD spectra of Ag30Zn70 alloys after electrochemical dealloying with different current densities in 0.1 mol/L HCl solution
Fig.6  Low (a, c) and high (b, d) magnified SEM iamges of Ag30Zn70 alloys after electrochemical dealloying with applied current densities of 2.5 mA/cm2 (a, b) and 5.0 mA/cm2 (c, d) in 0.1 mol/L HCl solution
Fig.7  Cyclic voltammetry (CV) curves (a) and local magnification (b) of nanoporous silver (NPS) and Ag30Zn70 original alloy in 0.5 mol/L KOH solution with 50 mmol/L HCHO (Scan rate V=50 mV/s)
Fig.8  CV curves of NPS-3 in 0.5 mol/L KOH solution with 50 mmol/L HCHO at different scan rates (a), and linear relationship between peak current density and the square root of scan rates (b)
Fig.9  CV curves of NPS-3 in 0.5 mol/L KOH solution with 50 mmol/L HCHO in different cycle number at V=50 mV/s (a), and relationship between peak current density and cycle number (b)
Fig.10  CV curves of NPS-2 (a) and NPS-3 (b) in 0.5 mol/L KOH solution with 10, 30, 50, 80 and 100 mmol/L HCHO at V=50 mV/s, linear relationship between peak current density and formaldehyde concentrations (c) (CHCHO—HCHO concentration)
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