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Polydopamine nanofilms for high-performance paper-based electrochemical devices
Biopolymers ( IF 2.9 ) Pub Date : 2021-08-25 , DOI: 10.1002/bip.23472 Leonardo H Hasimoto 1, 2 , Cátia C Corrêa 2 , Carlos A R Costa 2 , Murilo Santhiago 1, 2
Biopolymers ( IF 2.9 ) Pub Date : 2021-08-25 , DOI: 10.1002/bip.23472 Leonardo H Hasimoto 1, 2 , Cátia C Corrêa 2 , Carlos A R Costa 2 , Murilo Santhiago 1, 2
Affiliation
Since the discovery of polydopamine (PDA), there has been a lot of progress on using this substance to functionalize many different surfaces. However, little attention has been given to prepare functionalized surfaces for the preparation of flexible electrochemical paper-based devices. After fabricating the electrodes on paper substrates, we formed PDA on the surface of the working electrode using a chemical polymerization route. PDA nanofilms on carbon were characterized by contact angle (CA) experiments, X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy (topography and electrical measurements) and electrochemical techniques. We observed that PDA introduces chemical functionalities (RNH2 and RC═O) that decrease the CA of the electrode. Moreover, PDA nanofilms did not block the heterogeneous electron transfer. In fact, we observed one of the highest standard heterogeneous rate constants (ks) for electrochemical paper-based electrodes (2.5 ± 0.1) × 10−3 cm s−1, which is an essential parameter to obtain larger currents. In addition, our results suggest that carbonyl functionalities are ascribed for the redox activity of the nanofilms. As a proof-of-concept, the electrooxidation of nicotinamide adenine dinucleotide showed remarkable features, such as, lower oxidation potential, electrocatalytic peak currents more than 30 times higher when compared to unmodified paper-based electrodes and electrocatalytic rate constant (kobs) of (8.2 ± 0.6) × 102 L mol−1 s−1.
中文翻译:
用于高性能纸基电化学装置的聚多巴胺纳米膜
自从发现聚多巴胺 (PDA) 以来,在使用这种物质对许多不同的表面进行功能化方面取得了很大进展。然而,很少有人关注制备用于制备柔性电化学纸基器件的功能化表面。在纸基板上制造电极后,我们使用化学聚合途径在工作电极表面形成 PDA。碳上的 PDA 纳米膜通过接触角 (CA) 实验、X 射线光电子能谱、扫描电子显微镜、原子力显微镜(形貌和电学测量)和电化学技术进行了表征。我们观察到 PDA 引入了化学官能团(R NH 2和 R C=O) 降低电极的 CA。此外,PDA 纳米薄膜没有阻止异质电子转移。事实上,我们观察到电化学纸基电极 (2.5 ± 0.1) × 10 -3 cm s -1的最高标准异质速率常数 ( k s ) 之一,这是获得更大电流的必要参数。此外,我们的结果表明羰基官能团归因于纳米膜的氧化还原活性。作为概念验证,烟酰胺腺嘌呤二核苷酸的电氧化表现出显着特点,例如,与未改性的纸基电极相比,较低的氧化电位,电催化峰值电流高出 30 倍以上,电催化速率常数 ( kobs ) 的 (8.2 ± 0.6) × 10 2 L mol -1 s -1。
更新日期:2021-08-25
中文翻译:
用于高性能纸基电化学装置的聚多巴胺纳米膜
自从发现聚多巴胺 (PDA) 以来,在使用这种物质对许多不同的表面进行功能化方面取得了很大进展。然而,很少有人关注制备用于制备柔性电化学纸基器件的功能化表面。在纸基板上制造电极后,我们使用化学聚合途径在工作电极表面形成 PDA。碳上的 PDA 纳米膜通过接触角 (CA) 实验、X 射线光电子能谱、扫描电子显微镜、原子力显微镜(形貌和电学测量)和电化学技术进行了表征。我们观察到 PDA 引入了化学官能团(R NH 2和 R C=O) 降低电极的 CA。此外,PDA 纳米薄膜没有阻止异质电子转移。事实上,我们观察到电化学纸基电极 (2.5 ± 0.1) × 10 -3 cm s -1的最高标准异质速率常数 ( k s ) 之一,这是获得更大电流的必要参数。此外,我们的结果表明羰基官能团归因于纳米膜的氧化还原活性。作为概念验证,烟酰胺腺嘌呤二核苷酸的电氧化表现出显着特点,例如,与未改性的纸基电极相比,较低的氧化电位,电催化峰值电流高出 30 倍以上,电催化速率常数 ( kobs ) 的 (8.2 ± 0.6) × 10 2 L mol -1 s -1。