Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, PL-30059, Krakow, Poland.
Mikrochim Acta. 2019 Nov 15;186(12):777. doi: 10.1007/s00604-019-3830-x.
A new approach is presented for the design of ion selective electrodes. Ruthenium dioxide nanoparticles were incorporated into solid-contact electrodes, and their properties were studied for the case of pH-selective electrodes. The use of the RuO is shown to significantly improve the potentiometric response, while no redox response is observed. The use of RuO results in a Nernstian slope (59 mV/decade) towards hydrogen ions over a wide linear range (pH 2 to 12). The results obtained by chronopotentiometry reveal small resistance, and the capacitance is as high as 1.12 mF. This results in a good stability of the response and in a low potential drift (0.89 μV∙s). The electrodes exhibit properties nearly as excellent as those of a glass electrode, but they are much smaller, less fragile, and easy to use. Graphical abstractSchematic representation of the construction of the new kind of electrodes along with calibration and chronopotentiometric plots compared to non-modified GCD/H-ISM and modified GCD/RuO/H-ISM electrodes, respectively. The use of ruthenium dioxide results in a wide analytical pH range (2-12) and in high electrical capacitance (1.12 mF).
提出了一种设计离子选择性电极的新方法。将二氧化钌纳米粒子掺入到固体接触电极中，并研究了其在 pH 选择性电极中的性质。结果表明，RuO 的使用显著改善了电位响应，而没有观察到氧化还原响应。RuO 的使用导致在宽线性范围内（pH 2 至 12）对氢离子呈现出 Nernstian 斜率（59 mV/decade）。恒电流计时法得到的结果表明电阻小，电容高达 1.12 mF。这导致响应具有良好的稳定性和低的电位漂移（0.89 μV·s）。与非修饰的 GCD/H-ISM 和修饰的 GCD/RuO/H-ISM 电极相比，这些电极具有几乎与玻璃电极一样优异的性能，但它们更小、更脆弱、更容易使用。
