Niemiec Barbara, Zambrzycki Marcel, Piech Robert, Wardak Cecylia, Paczosa-Bator Beata
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland.
Department of Analytical Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Sklodowska University in Lublin, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland.
Materials (Basel). 2022 Jul 9;15(14):4803. doi: 10.3390/ma15144803.
This work proposes new carbon materials for intermediate layers in solid-contact electrodes sensitive for potassium ions. The group of tested materials includes electrospun carbon nanofibers, electrospun carbon nanofibers with incorporated cobalt nanoparticles and hierarchical nanocomposites composed of carbon nanotubes deposited on nanofibers with different metal nanoparticles (cobalt or nickel) and nanotube density (high or low). Materials were characterized using scanning electron microscopy and contact angle microscopy. Electrical parameters of ready-to-use electrodes were characterized using chronopotentiometry and electrochemical impedance spectroscopy. The best results were obtained for potassium electrodes with carbon nanofibers with nickel-cobalt nanoparticles and high density of nanotubes layer: the highest capacity value (330 µF), the lowest detection limit (10 M), the widest linear range (10-10) and the best reproducibility of normal potential (0.9 mV). On the other hand the best potential reversibility, the lowest potential drift (20 μV·h) in the long-term test and the best hydrophobicity (contact angle 168°) were obtained for electrode with carbon nanofibers with cobalt nanoparticles and high density of carbon nanotubes. The proposed electrodes can be used successfully in potassium analysis of real samples as shown in the example of tomato juices.
这项工作提出了用于对钾离子敏感的固体接触电极中间层的新型碳材料。测试材料组包括电纺碳纳米纤维、掺入钴纳米颗粒的电纺碳纳米纤维以及由沉积在具有不同金属纳米颗粒（钴或镍）和不同纳米管密度（高或低）的纳米纤维上的碳纳米管组成的分级纳米复合材料。使用扫描电子显微镜和接触角显微镜对材料进行了表征。使用计时电位法和电化学阻抗谱对即用型电极的电学参数进行了表征。对于具有镍钴纳米颗粒和高密度纳米管层的碳纳米纤维钾电极，获得了最佳结果：最高电容值（330 μF）、最低检测限（10 M）、最宽线性范围（10 - 10）和正常电位的最佳重现性（0.9 mV）。另一方面，对于具有钴纳米颗粒和高密度碳纳米管的碳纳米纤维电极，在长期测试中获得了最佳的电位可逆性、最低的电位漂移（20 μV·h）和最佳的疏水性（接触角168°）。如番茄汁示例所示，所提出的电极可成功用于实际样品的钾分析。
