Synthesis, fabrication and characterization of 2-naphthyloxy group-substituted bis(2-pyridylimino)isoindoline and its derivatives as a positive electrode for vanadium redox flow battery applications

Selin Gümrükçü, Mukaddes Özçeşmeci, Nilüfer Koçyiğit, Kerem Kaya, Ahmet Gül, Yücel Şahin*, İbrahim Özçeşmeci*

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Özet

In recent years, tridentate nitrogen donor ligands have played a vital role in inorganic chemistry. The ease of synthesis, readily modifiable structure and high stability of 1,3-bis(2-pyridylimino)isoindole (BPIs) compounds make them suitable candidates for many potential applications. In this study, a 1,3-bis(2-pyridylimino)isoindoline derivative bearing a naphthoxy unit and its palladium complex (PdBPI) were synthesized and characterized by single crystal X-ray diffraction, NMR, FT-IR, UV-Vis, and mass spectroscopic methods. The BPI- or PdBPI-modified pencil graphite electrodes were clarified via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), EDX, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The efficiency of these substances in a vanadium redox flow battery (VRB) system was investigated for the first time. The behaviors of the BPI-modified carbon felt electrode (BPI-CF) and PdBPI-modified carbon felt electrode (PdBPI-CF) were investigated in the redox flow battery (RFB) applications. These modified electrodes were obtained by the electrodeposition method. The respective charge potentials of BPI-CF and PdBPI-CF reached 1.63 V and 1.88 V, respectively. The discharge capacity maxima obtained were ∼301 mA h (1204 mA h L−1) and ∼303 mA h (1212 mA h L−1) for BPI-CF and PdBPI-CF at the VRB system under a charge current density of 4.0 mA cm−2 and discharge current density of 0.4 mA cm−2, respectively.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)5265-5276
Sayfa sayısı12
DergiDalton Transactions
Hacim52
Basın numarası16
DOI'lar
Yayın durumuYayınlandı - 18 Mar 2023

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Publisher Copyright:
© 2023 The Royal Society of Chemistry

Finansman

This work was supported by Istanbul Technical University — Scientific Research Projects Unit (ITU-BAP) [Project Numbers: 42274 and 43057]. Selin Gümrükçü has received research grants from ITU-BAP (Istanbul Technical University — Scientific Research Projects Unit). Selin Gümrükçü also acknowledges TUBITAK-BIDEB for a Ph.D. scholarship (2211C). The authors thank Dr. Hürmüs Gürsu and Dr. Melih Arvas for their contributions to the work.

FinansörlerFinansör numarası
Istanbul Technical University — Scientific Research Projects Unit
TUBITAK-BIDEB2211C
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik Üniversitesi42274, 43057

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