pH-controlled morphological structure and electrochemical performances of polyaniline/nickel hexacyanoferrate nanogranules during electrochemical deposition
pH-controlled morphological structure and electrochemical performances of polyaniline/nickel hexacyanoferrate nanogranules during electrochemical deposition
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电化学沉积过程中聚苯胺/六氰基铁酸镍纳米颗粒的pH控制形态结构和电化学性能
DOI：
10.1007/s10008-014-2559-z
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发表时间：
2014-07
影响因子：
2.5
通讯作者：
Ma, Guozhang
中科院分区：
文献类型：
--
作者：
Hao, Xiaogang;Zhang, Xinru;Zhang, Zhonglin;Ma, Guozhang
为了探究聚苯胺/六氰基铁酸镍（PANI/NiHCF）纳米颗粒的形貌和电化学性能对反应体系pH值的依赖性，通过循环伏安法在碳纳米管（CNT）修饰的铂基底上在0至7的pH范围内进行PANI/NiHCF纳米颗粒的电沉积。 0.002 mol L−1NiSO4、0.25 mol L−1Na2SO4、0.002 mol L−1K3Fe(CN)6 和 0.01 mol L−1 苯胺溶液的混合物。 PANI/NiHCF纳米颗粒的形貌和结构分别通过扫描电子显微镜（SEM）和傅里叶变换红外（FTIR）光谱进行表征。通过循环伏安法（CV）、充放电测试和电化学阻抗谱（EIS）研究了纳米颗粒的超电容性能。结果表明，随着pH值从0到7的变化，得到了不同形貌和尺寸的纳米颗粒，可以直接控制均相或异相成核机制。在pH 0和pH 1条件下，纳米颗粒均匀分散在基质中，但其尺寸随着pH值的增加而减小。从pH 2到7，发现了光滑的交联网络结构。从pH 0到7，PANI/NiHCF纳米颗粒的结构略有变化。从pH 0到7，PANI/NiHCF纳米颗粒在0.5 mol L−1H2SO4和0.5 mol L−1KNO3溶液的混合物中具有良好的电化学性能，并获得了最高比电容值274 F g−1目前 中性介质中的密度为 2 mA cm−2。 PANI/NiHCF 纳米颗粒在 2,000 次 CV 循环后在中性介质中具有高稳定性。
To explore the dependences of morphology and electrochemical performance of polyaniline/nickel hexacyanoferrate (PANI/NiHCF) nanogranules on pH value of the reaction system, electrodeposition of PANI/NiHCF nanogranules was performed across a pH range from 0 to 7 on carbon nanotubes (CNTs)-modified platinum substrate by cyclic voltammetry in a mixture of 0.002 mol L−1NiSO4, 0.25 mol L−1Na2SO4, 0.002 mol L−1K3Fe(CN)6, and 0.01 mol L−1aniline solutions. The morphology and structure of PANI/NiHCF nanogranules were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy, respectively. The supercapacitive performances of the nanogranules were investigated with cyclic voltammetry (CV), charge/discharge tests, and electrochemical impedance spectroscopy (EIS). The results showed that the nanogranules with different morphology and sizes were obtained with the change of pH values from 0 to 7, which could control the mechanism of homogeneous or heterogeneous nucleation directly. The nanogranules were dispersed in matrix uniformly at pH 0 and pH 1, while the size of which decreased with the increase of pH values. The smooth cross-linking network structure was found from pH 2 to 7. The structure of PANI/NiHCF nanogranules had slightly changed from pH 0 to 7. PANI/NiHCF nanogranules had good electrochemical performance from pH 0 to 7 in a mixture of 0.5 mol L−1H2SO4and 0.5 mol L−1KNO3solutions, and the highest specific capacitance value of 274 F g−1was obtained at current densities of 2 mA cm−2in neutral medium. PANI/NiHCF nanogranules had high stability in neutral medium after 2,000 cycles by CV.
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