Electrochemical impedance spectroscopy (EIS) data of 5.0 mM [Fe(CN)6] 3−/4− in 0.1 M KCl at a BCPE, b ZnO NPs−CPE, c Poly(glutamic acid)/CP and d Poly(glutamic acid)/ZnO−CPE at a frequency range of 0.01 Hz – 100 kHz, applied potential of 0.15 V and amplitude of 0.005 V

<br> <br> EIS is a very useful technique that indicates the interfacial electron transfer rate. This EIS Data was obtained using CHI 760D Electrochemical Workstation. It was described in the Nyquist plot of 5.0 mM [Fe(CN)6] 3−/4− in 0.1 M KCl at <strong>a</strong> BCPE,<strong> b</strong> ZnO NPs−CPE, <strong>c</strong> Poly(glutamic acid)/CPE ,and <strong>d</strong> Poly(glutamic acid)/ZnO−CPE at a frequency range of 0.01 Hz – 100 kHz, applied potential of 0.15 V and amplitude of 0.005 V.

电化学阻抗谱（Electrochemical Impedance Spectroscopy，EIS）是一种可表征界面电子转移速率的极具实用价值的测试技术。本数据集的EIS数据采用CHI 760D电化学工作站采集得到。该数据集以奈奎斯特图（Nyquist plot）形式呈现，对应于0.1 mol/L氯化钾（KCl）溶液中5.0 mmol/L铁氰化钾/亚铁氰化钾([Fe(CN)₆]³⁻/⁴⁻)体系，测试电极分别为：**a** 裸碳糊电极（BCPE）、**b** 氧化锌纳米颗粒修饰碳糊电极（ZnO NPs−CPE）、**c** 聚谷氨酸修饰碳糊电极（Poly(glutamic acid)/CPE）以及**d** 聚谷氨酸/氧化锌复合修饰碳糊电极（Poly(glutamic acid)/ZnO−CPE）；测试参数设置为：频率范围0.01 Hz至100 kHz，施加工作电位0.15 V，交流扰动振幅0.005 V。