A capacitive-analogue of semiconductor-based diodes (CAPode) and its fabrication via 3D-printing Christin Gellrich , Yannik Bräuniger, Dr. Julia Grothe, Prof. Stefan Kaskel Technical University Dresden, Germany The CAPode is a highly asymmetric capacitor with unidirectional charging characteristics based on the size regulation of pores and ions and was firstly proposed in 2019 by the Kaskel’s group. [1] In particular, the CAPode consists of an ultramicroporous and mesoporous carbon as well as an electrolyte with cations and anions of different size. Due to the defined small pore size of the ultramicroporous carbon the bulky cations can be effectively blocked outside of the sub-nanometer pores while small anions can be accommodated leading to a high current rectification ratio. This can be especially interesting for possible future applications like AC- rectification and simultaneous grid-stabilization, but also in ion-based logic circuits for low-energy computing. While current research has mainly focused on expanding the unidirectional charging behavior to both bias directions and increasing the rectification ratio by the usage of new electrode materials, [2][3] the CAPode design is still limited to thin film electrodes in a macroscopic scale which is hindering the miniaturization of the CAPode and its implementation in a planar electrical circuit. To fabricate the desired interdigital in-plane CAPodes a suitable versatile micro-fabrication method is decisive. The three-dimensional (3D) printing technique provides several advantages such as high degree of freedom in design and geometry which is especially crucial for the assembly and logic connection of multiple electrode arrays. [4] Herein, we give a general overview about the concept of the CAPode and present possible printing strategies to fabricate in-plane, interdigital CAPodes. References 1. E. Zhang, N. Fulik, G. P. Hao, H. Y. Zhang, K. Kaneko, L. Borchardt, E. Brunner, S. Kaskel, Angew. Chemie - Int. Ed. 2019 , 58 , 13060–13065. 2. J. Feng, Y. Wang, Y. Xu, H. Ma, G. Wang, P. Ma, Y. Tang, X. Yan, Adv. Mater. 2021 , 33 , 1–8. 3. P. Tang, W. Tan, F. Li, S. Xue, Y. Ma, P. Jing, Y. Liu, J. Zhu, X. Yan, Adv. Mater. 2023 , 2209186 , 1–10. 4. Y. Z. Zhang, Y. Wang, T. Cheng, L. Q. Yao, X. Li, W. Y. Lai, W. Huang, Chem. Soc. Rev. 2019 , 48 , 3229–3264.
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