Electropolymerization of aromatic monomers driven by a streaming potential Suguru Iwai, Ikuyoshi Tomita, Shinsuke Inagi Tokyo Institute of Technology, Japan Bipolar electrodes (BPEs), which are driven by an external electric field with a low concentration of supporting electrolyte, are attracting more attention thanks to their unique features such as gradient potential distribution, synergy with electrophoresis, and so on [1] . In contrast to conventional electrolysis, which requires a large amount of supporting electrolyte, bipolar electrolysis can reduce the amount of supporting electrolyte. Therefore, bipolar electrochemistry is an environmentally friendly electrolysis system. We have achieved electrochemical fluorination using BPEs in a batch cell [2] and a flow cell [3] , reducing the amount of supporting electrolyte to 1/100 compared with conventional electrolysis (Figure 1(a)) . Recently, a novel pressure-driven BPE system has been demonstrated by Crooks et al., where the BPE is driven by a streaming potential ( E str ) [4] . E str is a potential difference between the inlet and the outlet of the microchannel as the low concentration electrolyte is pumped. In this context, we have developed an electrolytic system using BPEs without an external electric power supply [5] . Herein, we report the electropolymerization of aromatic monomers using the pressure-driven BPE ( Figure 1(b) ). First, the E str was measured with various electrolytes and channel materials. As a result, about 2.0 V of E str was observed by filling a microchannel with cotton and pumping the electrolyte of 0.5 mM Bu 4 NPF 6 /MeCN. This value of E str is sufficient for pyrrole electropolymerization. Then, we carried out the electropolymerization of pyrrole with this BPE device. During the pumping of the electrolyte containing pyrrole, the current associated with electrolysis was observed, indicating the progress of electropolymerization. In fact, polypyrrole was deposited on the upstream electrode, while there was no deposition on the downstream electrode. The cyclic voltammetry measurement supported the polypyrrole deposition. Therefore, we concluded that the electropolymerization proceeded with the upstream electrode as the anode and the downstream electrode as the cathode. More details of E str measurement and electropolymerization will be shown in the poster presentation.
References 1. N. Shida, Y. Zhou, S. Inagi, Acc. Chem. Res. , 2019 , 52 , 2598–2608. 2. K. Miyamoto, H. Nishiyama, I. Tomita, S. Inagi, ChemElectroChem , 2019 , 6 , 97–100. 3. H. Sakagami, H. Takenaka, S. Iwai, N. Shida, E. Villani, A. Gotou, T. Isogai, A. Yamauchi, Y. Kishikawa, T. Fuchigami, I. Tomita, S. Inagi, ChemElectroChem , 2022 , 9 , e202200084. 4. I. Dumitrescu, R. K. Anand, S. E. Fosdick, R. M. Crooks, J. Am. Chem. Soc. , 2011 , 133 , 4687–4689. 5. S. Iwai, T. Suzuki, H. Sakagami, K. Miyamoto, Z. Chen, M. Konishi, E. Villani, N. Shida, I. Tomita, S. Inagi, Commun. Chem. , 2022 , 5 , 66.
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