双金属Ag-Cu枝晶的制备及应用

引用本文: 康亚荣, 陈福义. 双金属Ag-Cu枝晶的制备及应用[J]. 物理化学学报, 2013, 29(08): 1712-1718. doi: 10.3866/PKU.WHXB201305132 shu

Citation: KANG Ya-Rong, CHEN Fu-Yi. Synthesis and Application of Ag-Cu Bimetallic Dendrites[J]. Acta Physico-Chimica Sinica, 2013, 29(08): 1712-1718. doi: 10.3866/PKU.WHXB201305132 shu

双金属Ag-Cu枝晶的制备及应用

康亚荣 ,
陈福义

基金项目:
国家自然科学基金(51271148, 50971100) (51271148, 50971100)

凝固技术国家重点实验室自主研究课题(30-TP-2009) (30-TP-2009)

航空科学基金(2012ZF53073)资助项目 (2012ZF53073)

摘要:

通过铜箔基体上电沉积泡沫铜结合伽尔瓦尼置换反应制备出了银-铜(Ag-Cu)纳米枝晶, 利用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)对枝晶的成分及形貌进行研究发现, 随着沉积过电位的增加, 铜的前驱体形貌由棒状到枝晶状, 最后发展为泡沫状, 但泡沫状的前驱体制备的Ag-Cu 枝晶却是最规整和致密的. 另外, 银离子的浓度也会影响枝晶的形貌, 一定范围内浓度的增加有利于枝晶的形成. 通过线性扫描伏安和电流-时间曲线对制备的Ag-Cu 枝晶催化性能进行表征, 在电解质溶液中, -0.25 V(相对于饱和甘汞电极(SCE))时有一个明显的双氧水(H₂O₂)还原峰, 这意味着Ag-Cu枝晶对H₂O₂的电还原具有较好的催化活性, 当该电极被用于双氧水传感器时, 电流响应快, 能在3 s 内达到稳态电流, 线性测量范围为0.1-12 mmol·L^-1, 灵敏度可以达到330.36 μA·(mmol·L^-1)^-1·cm^-2, 这点对于提高传感器的准确性非常重要.

关键词:

English

Synthesis and Application of Ag-Cu Bimetallic Dendrites

KANG Ya-Rong ,
CHEN Fu-Yi

1.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, P. R. China
Received Date: 14 March 2013
Available Online: 09 July 2013
Fund Project:
国家自然科学基金(51271148, 50971100)

凝固技术国家重点实验室自主研究课题(30-TP-2009)

航空科学基金(2012ZF53073)资助项目

Abstract:

We synthesized silver-copper (Ag-Cu) dendritic structures on Cu foil by electrodeposition and subsequent galvanic displacement reaction. The crystalline nature and morphology of the nanostructures were examined by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM), respectively. The morphology of the Cu precursor changed from rod to dendrite, and finally grew into foam as the overpotential was increased. When the Cu precursor was reacted with silver nitrate through galvanic displacement reaction, a foam-like precursor produced a denser, more uniform Ag-Cu dendrite. In addition, the concentration of silver nitrate solution had a considerable effect on the shape of the nanoparticles, with increasing concentration within a certain range promoting dendrite formation. The electrochemical properties of the Ag-Cu dendrite-modified electrode were characterized by linear sweep voltammetry and amperometric current-time curves. The reduction peak potential was about -0.25 V (vs a saturated calomel electrode (SCE)) in the electrolyte solution, which indicates that the as-synthesized Ag-Cu dendrites have favorable electroreduction activity towards hydrogen peroxide (H₂O₂). When an Ag-Cu dendrite was used as a sensor, the electrode exhibited a rapid response time of 3 s, a wide linear range of 0.1-12 mmol·L^-1 H₂O₂, and a remarkable sensitivity of 330.36 μA·(mmol·L^-1)^-1·cm^-2, which is particularly important to improve the accuracy of sensors.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

双金属Ag-Cu枝晶的制备及应用

English

Synthesis and Application of Ag-Cu Bimetallic Dendrites

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

双金属Ag-Cu枝晶的制备及应用

English

Synthesis and Application of Ag-Cu Bimetallic Dendrites

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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