Department of Physical Chemistry, Higher Technical School of Industrial Engineering, University of Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
Department of Physical Chemistry, Institute of Electrochemistry, University of Alicante, 03690 San Vicente del Raspeig, Alicante, Spain.
Sensors (Basel). 2019 Apr 9;19(7):1685. doi: 10.3390/s19071685.
The use of disposable screen-printed electrodes (SPEs) has extraordinarily grown in the last years. In this paper, conductive inks from scrapped SPEs were removed by acid leaching, providing high value feedstocks suitable for the electrochemical deposition of Ag, Pt and Ag core-Pt shell-like bimetallic (AgPt) nanoparticles, onto screen-printed carbon electrodes (M@SPCEs, M = Ag, Pt or AgPt, L = metal nanoparticles from leaching solutions). M@SPCEs were characterized by scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The results were compared to those obtained when metal nanoparticles were synthesised using standard solutions of metal salts (M@SPCEs). Both M@SPCEs and M@SPCEs exhibited similar cyclic voltammetric patterns referred to the electrochemical stripping of silver or the adsorption/desorption of hydrogen/anions in the case of platinum, proving leaching solutions extremely effective for the electrodeposition of metallic nanoparticles. The use of both M@SPCEs and M@SPCEs proved effective in enhancing the sensitivity for the detection of H₂O₂ in phosphate buffer solutions (pH = 7). The AgPt@SPCE was used as proof of concept for the validation of an amperometric sensor for the determination of H₂O₂ within laundry boosters and antiseptic samples. The electrochemical sensor gave good agreement with the results obtained by a spectrophotometric method with H₂O₂ recoveries between 100.6% and 106.4%.
一次性丝网印刷电极（SPE）的使用在过去几年中得到了极大的发展。在本文中，通过酸浸从废弃的 SPE 中去除导电油墨，提供了高价值的原料，适合电化学沉积 Ag、Pt 和 Ag 核-Pt 壳状双金属（AgPt）纳米粒子到丝网印刷碳电极（M@SPCEs，M = Ag、Pt 或 AgPt，L = 浸出溶液中的金属纳米粒子）上。M@SPCEs 通过扫描电子显微镜、循环伏安法和电化学阻抗谱进行了表征。结果与使用金属盐标准溶液合成金属纳米粒子时获得的结果进行了比较（M@SPCEs）。两种 M@SPCEs 和 M@SPCEs 都表现出相似的循环伏安模式，涉及银的电化学剥离或铂的氢/阴离子的吸附/解吸，证明浸出溶液对金属纳米粒子的电沉积非常有效。两种 M@SPCEs 和 M@SPCEs 的使用都证明了在增强磷酸盐缓冲溶液（pH = 7）中检测 H₂O₂的灵敏度方面是有效的。AgPt@SPCE 被用作概念验证，用于验证洗衣助剂和防腐剂样品中 H₂O₂的安培传感器的测定。电化学传感器与通过分光光度法获得的结果非常吻合，H₂O₂的回收率在 100.6%至 106.4%之间。
