Ti3C2Tx MXene as Intriguing Material for Electrochemical Capacitor
[ 1 ] Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ SzD ] doktorant ze Szkoły Doktorskiej | [ P ] pracownik
2023
artykuł naukowy
angielski
- Ti3C2Tx MXene
- hydrogen storage
- aqueous electrolyte
- overpotential
- wide operating voltage
- electrochemical capacitor
EN This study provides meaningful insight into the charge storage in Ti3C2Tx MXene for electrochemical capacitor application. Our experiments show that this 2D material is especially adapted for the hydrogen electrosorption under negative polarization. It is found that hydrogen bonding to the Ti3C2Tx surface occurs through interactions of various strength. Different mechanisms are suggested to explain the nature of H stored at the electrode/electrolyte interface depending on pH and potential range. For the negative potentials, both capacitive and faradaic currents are involved, and the electrode can operate in a relatively wide range. On the other hand, the narrow range of positive potentials limits whole voltage of electrochemical capacitor (EC). Such charge disproportion has a major impact on the performance failure of symmetric MXene-based ECs. New design of MXene cells with a wide operating voltage is introduced. To equalize the charge storage of both electrodes, the positive Ti3C2Tx electrode is replaced by the porous carbon (BP2000) with a wide working potential and a good capacitive response. Thus, EC operating voltage is considerably expanded to 1.3, 1.4, 2V in acidic, basic, neutral medium, respectively. During cycling tests at 1A g-1, the asymmetric cell MXene/BP2000 maintains 80% of initial capacitance after 22000 cycles.
2307165-1 - 2307165-12
Article number: 2307165
CC BY (uznanie autorstwa)
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