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导电聚合物由于可应用于光电池、传感、电容器等领域而备受关注。本文以介孔二氧化硅为模板，利用电化学聚合的方法在工作电极上直接合成聚吡咯纳米线（PPy-nw）并进行改性。首先在Pt电极上沉积均匀的聚吡咯薄膜（Pt| PPy），接着通过恒电位法在上制备二氧化硅，并以Pt| PPy -二氧化硅为工作电极，使聚吡咯纳米线生长在介孔硅的纳米通道内。最后将模板移除，获得了完整的Pt| PPy -nw，其电化学性能稳定，重复性好，且与普通块状Pt| PPy相比，在充放电过程中容量提升可达约360倍。扫描电镜结果显示了其类似刷子形状的纳米线形貌 (直径为30 nm)。电化学原位制备纳米结构聚合物修饰电极是一种廉价、简单、重复性好的方法，这种方法对导电聚合物的广泛应用将可能产生重大影响。
Abstract-摘要
Modification with polypyrrole nanowires, PPy-nw, is accomplished directly upon the working electrode by electrochemical polymerization methods using mesoporous silica as a template. The silica template is prepared by a potentiostatic method, generating a homogeneous film over a previously deposited thin layer of PPy, so that PPy-nw grows within the nanochannels of the mesoporous silica and adheres firmly to the surface. Subsequently the template is removed to obtain intact Pt|PPy-nw with stable and reproducible electrochemical properties, and with an enhanced (about 360 times higher charge capacity) response after charge–discharge experiments compared to equivalent electrodes modified with polymer deposits in the bulk (PPy) form. SEM reveals the brush-type conformation of PPy-nw (30 nm in diameter). Thus, a cheap, simple, highly repeatable method is used in situ to prepare electrodes modified with nano-structured polymers, using electrochemical techniques alone. This could have a great impact on a wide range of applications of conducting polymers.
Figures-图片
Fig. 1. Voltammetric profiles of Pt|PPy-silica prepared by applying different electroforming potentials vs SCE for 5 s. Interphase: 0.100 mol L−1 TBAPF6 + 0.010 mol L−1 ferrocene in CH3CN, scan rate 0.1 V s−1.
Fig. 2. (A) Voltammetric profiles (5th cycle) during the growth of PPy on: (—) Pt|PPy;(---)Pt|PPy-silica. Interphase:0.01 mol L−1 pyrrole
+ 0.100 mol L−1 TBAPF6 in anhydrous CH3CN (inset: detail of first cycle to obtain monomer oxidation potential). (B) Charge–discharge experiments or voltammetric p-doping/ undoping responses of (—) Pt|PPy and (---) Pt|PPy-nw (inset: enlargement of the Pt|PPy electrode response). Interphase: 0.100 mol L−1 TBAPF6, in anhydrous CH3CN. Scan rate 0.100 V s−1.
Fig. 3. SEM micrographs of p-doped modified electrodes Pt |PPy-nw: (A–B) top views; (C–D) cross-sectional views.
期刊简介
《Electrochemistry Communications》（《电化学通讯》）是一本通讯期刊，旨在促进电化学领域最新研究成果的快速传播。主要涉及领域包括基本电化学原理，电极反应机理，计算和理论电化学，界面特性，电化学表面科学，电池和能源，生物电化学，有机和有机金属化学，分光电化学等。我们致力于打造电化学领域的顶尖期刊。该期刊的主编是牛津大学- Richard G. Compton教授；该期刊的副主编是魁北克大学蒙特利尔分校(UQAM) - D. Bélanger教授和罗蒙诺索夫莫斯科州立大学- Arkady A. Karyakin教授；该期刊的发展编辑是中南大学纪效波教授。
Electrochemistry Communications
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