Jeong Du Won, Kim Kyuhyoung, Lee Geonhee, Kang Minsoung, Chang Hyunju, Jang A-Rang, Lee Jeong-O
Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea.
Department of Physics and Graphene Research Institute, Sejong University, Seoul 05006, Republic of Korea.
ACS Nano. 2022 Jun 28;16(6):9278-9286. doi: 10.1021/acsnano.2c01786. Epub 2022 Jun 14.
In the present study, we used the electrochemical transparency of graphene to show that the direct intercalation of alkali-metal cations is not a prerequisite for the redox reaction of Prussian blue (PB). PB thin films passivated with monolayer graphene still underwent electrochemical redox reactions in the presence of alkali-metal ions (K or Na) despite the inability of the cations to penetrate the graphene and be incorporated into the PB. Graphene passivation not only preserved the electrochemical activity of the PB but also substantially enhanced the stability of the PB. As a proof of concept, we showed that a transparent graphene electrode covering PB can be used as an excellent hydrogen peroxide transducer, thereby demonstrating the possibility of realizing an electrochemical sensor capable of long-term measurements.
在本研究中，我们利用石墨烯的电化学透明度来表明，碱金属阳离子的直接插入并非普鲁士蓝（PB）氧化还原反应的先决条件。尽管阳离子无法穿透石墨烯并掺入PB中，但用单层石墨烯钝化的PB薄膜在碱金属离子（K或Na）存在下仍会发生电化学氧化还原反应。石墨烯钝化不仅保留了PB的电化学活性，还显著提高了PB的稳定性。作为概念验证，我们表明覆盖PB的透明石墨烯电极可作为出色的过氧化氢传感器，从而证明了实现能够进行长期测量的电化学传感器的可能性。
