摘要
以Ag30Zn70合金为原料,通过调控脱合金电势及电流的2种电化学脱合金方法制备纳米多孔Ag材料。结果表明,脱合金电位或电流对纳米多孔Ag的成分、结构及孔径尺寸有重要影响。通过在2.5 mA/cm2电流密度下脱合金处理6000 s后可获得孔径约为80 nm的双连续纳米多孔Ag结构。循环伏安实验结果表明,纳米多孔Ag在0.5 mol/L的KOH溶液中对甲醛有良好的催化和检测性能,归因于纳米多孔结构中较优的纳米多孔孔径和Ag韧带的尺寸匹配。具有更小尺寸孔径的纳米多孔Ag有着更高的甲醛催化和检测性能。孔径约为80 nm的纳米多孔Ag在10~100 mmol/L浓度范围内的甲醛检测灵敏度达到0.22 mA·cm^-2·(mmol·L^-1)-1;在含有100 mmol/L HCHO的0.5 mol/L KOH溶液中的催化峰值电流密度达到25.0 mA/cm^2。
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 Ag30 Zn70 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 m A/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 solutiondue 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.
作者
杨玉林
穆张岩
范铮
淡振华
王莹
常辉
Yulin YANG;MU Zhangyan;FAN Zheng;DAN Zhenhua;WANG Ying;CHANG Hui(College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Iron and Steel Group Corporation,Anshan 114021,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第10期1302-1310,共9页
Acta Metallurgica Sinica
基金
国防基础科研计划项目No.JCKY08414C020
江苏高校品牌专业建设工程项目No.PPZY2015B128
海洋装备用金属材料及其应用国家重点实验室开放基金项目No.HG-SKL(2018)06~~
关键词
电化学脱合金法
纳米多孔Ag
甲醛检测
循环伏安法
electrochemical dealloying
nanoporous silver
formaldehyde detection
cyclic voltammetry
