Photo-supercapacitors based on zinc oxide/MXene paper dual acting electrodes

• Published in: Journal of energy storage Vol. 86; p. 111274
• Main Authors: Colak, Tuluhan Olcayto, Altaf, Cigdem Tuc, Yesilbag, Fatma Nur Tuzluca, Yesilbag, Yasar Ozkan, Yildirim, Ipek Deniz, Erdem, Emre, Misirlioglu, Feray Bakan, Sankir, Nurdan Demirci, Sankir, Mehmet
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10.05.2024
• Subjects: MXene; Photo-supercapacitor; Solar energy; Zinc oxide; Zinc oxide; Solar energy; MXene; Photo-supercapacitor
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2024.111274

Photo-supercapacitors (PSCs) have great potential as devices that enable both the conversion and storage of solar energy. However, it remains challenging to design new dual-acting electrodes providing high energy density and capacitance with self-powering capacity. Herein, we successfully prepared dual electrodes using ZnO-nanoflake and Ti3C2Tx-based MXene paper. By utilization of the MXene to the PSC device, capacitive contribution to the total capacitance increased ∼4 times compared to the bare ZnO-nanoflake-based PSC due to the surface redox reactions and electrically double layer formation. Maximum energy and power density of 57.3 μWhcm−2 and 11.1 mWcm−2, respectively were obtained for ZnO/MXene//MXene-PSC@UV irradiation and at a 2.5 V. Areal capacitance of this device calculated from CV was as high as 151.5 mFcm−2. Moreover, the ZnO/MXene//MXene-PSC device was highly stable over 10,000 GCD cycles with 100 % CE and 98 % Cp-retention under daylight. [Display omitted] •Dual electrodes using ZnO-nanoflake and MXene paper were successfully prepared.•Energy density increased 1.64 times with double MXene paper.•Areal capacitance of ZnO/MXene//MXene-PSC increased by 130 % with UV illumination.•Areal capacitance of ZnO/MXene//MXene-PSC@UV irradiation was 151.5 mFcm−2.•Excellent cycling stability (10,000 cycles with 100 % CE and 98 % Cp-retention)