Department of Chemistry, Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea.
KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea.
ACS Sens. 2023 Nov 24;8(11):4374-4383. doi: 10.1021/acssensors.3c01807. Epub 2023 Oct 19.
In this work, we report a bipolar electrode (BPE) array system with self-driven optical readouts of the faradic current flowing through the BPEs. The BPE array system is based on the spontaneous redox reactions that are respectively occurring at opposite poles of the BPEs with appropriate electrocatalysts on the poles; this system is analogous to one consisting of galvanic electrochemical cells. The galvanic BPE array system operates in a self-powered mode that requires there to be neither a direct electrical connection nor external electrical polarization to each BPE. Importantly, the appropriate electrocatalysts on the poles play a critical role in the galvanic BPE array system to induce the spontaneous redox reactions occurring at the poles of BPEs. Moreover, the galvanic BPE array system provides self-driven optical readouts, including fluorometric and colorimetric ones, to report the faradaic current resulting from the spontaneous redox reactions on the BPE poles. Based on the unique benefits that the galvanic BPE array system has over conventional BPEs, we demonstrated the promising potential of galvanic BPE arrays for the simple yet rapid and quantitative screening of electrocatalysts for the oxygen reduction reaction as well as sensitive sensing of HO in parallel.
在这项工作中，我们报告了一种具有自驱动光读出功能的双极电极 (BPE) 阵列系统，可读取通过 BPE 的 Faradic 电流。BPE 阵列系统基于自发的氧化还原反应，这些反应分别在 BPE 的相对极上发生，并且在极上具有适当的电催化剂；该系统类似于由原电池组成的系统。原电池 BPE 阵列系统以自供电模式运行，不需要对每个 BPE 进行直接电连接或外部电极化。重要的是，极上的适当电催化剂在原电池 BPE 阵列系统中起着关键作用，可诱导 BPE 极上发生自发氧化还原反应。此外，原电池 BPE 阵列系统提供自驱动的光学读出，包括荧光和比色读出，以报告源自 BPE 极上自发氧化还原反应的 Faradaic 电流。基于原电池 BPE 阵列系统相对于传统 BPE 的独特优势，我们展示了原电池 BPE 阵列在简单、快速和定量筛选氧还原反应电催化剂以及并行灵敏检测 HO 方面的有前途的潜力。
