电化学脱合金制备纳米多孔<strong>Ag</strong>及其甲醛检测性能

doi:10.11900/0412.1961.2019.00054

金属学报

2019, Vol. 55

Issue (10): 1302-1310 DOI: 10.11900/0412.1961.2019.00054

本期目录 | 过刊浏览

电化学脱合金制备纳米多孔Ag及其甲醛检测性能

杨玉林¹,穆张岩¹,范铮¹,淡振华^1,²(

),王莹²,常辉¹

1. 南京工业大学材料科学与工程学院南京 210009
2. 鞍山钢铁集团公司海洋装备用金属材料及其应用国家重点实验室鞍山 114021

Nanoporous Silver via Electrochemical Dealloying and Its Superior Detection Sensitivity to Formaldehyde

YANG Yulin¹,MU Zhangyan¹,FAN Zheng¹,DAN Zhenhua^1,²(

),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

引用本文:

杨玉林, 穆张岩, 范铮, 淡振华, 王莹, 常辉. 电化学脱合金制备纳米多孔Ag及其甲醛检测性能[J]. 金属学报, 2019, 55(10): 1302-1310.
Yulin YANG, Zhangyan MU, Zheng FAN, Zhenhua DAN, Ying WANG, Hui CHANG. Nanoporous Silver via Electrochemical Dealloying and Its Superior Detection Sensitivity to Formaldehyde[J]. Acta Metall Sin, 2019, 55(10): 1302-1310.

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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/cm²。

关键词 ：电化学脱合金法, 纳米多孔Ag, 甲醛检测, 循环伏安法

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

收稿日期: 2019-02-28

ZTFLH:

TG146

基金资助:国防基础科研计划项目(JCKY08414C020);江苏高校品牌专业建设工程项目(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(HG-SKL(2018)06)

作者简介: 杨玉林，男，1992年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00054 或 https://www.ams.org.cn/CN/Y2019/V55/I10/1302

图1 Ag30Zn70合金在含有1 g/L PVP的0.1 mol/L HCl溶液中，不同电位下电化学脱合金响应电流密度随时间变化图

图2 Ag30Zn70原始合金及其在不同电位下电化学脱合金后的XRD谱

图3 Ag30Zn70合金不同电位下电化学脱合金后微观组织的SEM像

图4 Ag30Zn70合金在0.1 mol/L的HCl溶液中不同电流密度下电化学脱合金电位随时间变化图

图5 Ag30Zn70合金在不同电流密度下电化学脱合金后的XRD谱

图6 Ag30Zn70合金在不同电流密度下电化学脱合金后微观组织的SEM像

图7 纳米多孔Ag和Ag30Zn70原始合金在含有50 mmol/L HCHO的0.5 mol/L KOH溶液中的CV曲线

图8 NPS-3在含有50 mmol/L HCHO的0.5 mol/L KOH溶液中不同扫描速率下的CV曲线，及甲醛氧化的峰值电流密度与扫描速率平方根的线性关系

图9 NPS-3在含有50 mmol/L HCHO的0.5 mol/L KOH溶液中不同循环次数的CV曲线，及甲醛氧化的峰值电流密度与循环次数的关系

图10 NPS-2和NPS-3在含有10、30、50、80及100 mmol/L HCHO的0.5 mol/L KOH溶液中的CV曲线，及甲醛氧化的峰值电流密度与甲醛浓度(CHCHO)的线性关系

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