Bilateral growth of monoclinic WO3 and 2D Ti3C2Tx on 3D free-standing hollow graphene foam for all-solid-state supercapacitor

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 421; p. 127883
• Main Authors: Patil, Amar M., Wang, Jiajia, Li, Shasha, Hao, Xiaoqiong, Du, Xiao, Wang, Zhongde, Hao, Xiaogang, Abudula, Abuliti, Guan, Guoqing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2021
• Subjects: Asymmetric all-solid-state supercapacitor; Hollow graphene foam; m-WO3/Ti3C2TX material; Ultra-high energy density; Unipolar electrodeposition; Unipolar electrodeposition; Ultra-high energy density; m-WO3/Ti3C2TX material; Hollow graphene foam; Asymmetric all-solid-state supercapacitor
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.127883

[Display omitted] •Hollow graphene foam was successfully prepared by TA-CVD method.•m-WO3/Ti3C2TX/HGF-7 electrode was fabricated by UPED and drop-casting methods.•The electrode exhibited a specific capacitance of 573F g−1 with 93.3% cycling stability.•An ASC device showed 27.2 Wh kg−1 energy density at power density of 752 W kg−1.•The ASC device endured superior cycling stability of 93% over 10,000 GCD cycles. The free-standing three dimensional (3D) hollow graphene foam (HGF) decorated nanostructured pseudocapacitive materials could offer a large active surface area and a extreme conductive porous 3D network for fast reversible charge transfer reactions in the supercapacitor. Herein, the 3D HGF was prepared by a template assisted-chemical vapor deposition (TA-CVD) method and the monoclinic WO3 (m-WO3) interconnected nanoparticles as well as 2D Ti3C2Tx sheets were bilaterally loaded on the inner and outer sides of HGF by a simple unipolar electrodeposition (UPED) method and a drop casting method, respectively. The obtained 3D free-standing m-WO3/Ti3C2TX/HGF electrode exhibited an excellent specific capacitance of 573F g−1 at 5 mV s−1 with outstanding rate performance and 93.3% cycling stability over 5000 cycles, which can be attributed to the metal-like conductivity and reversible redox reactions of hydrophilic 2D Ti3C2Tx. The asymmetric solid-state supercapacitor (ASC) illustrated a 2-fold wider potential of 1.4 V in an acidic electrolyte when compared with the MXene-based symmetric supercapacitor. It displayed an excellent specific capacitance of 145.2F g−1 (111.3 mF cm−2) at 5 mV s−1, an ultra-high energy density of 27.2 Wh kg−1 (20.83 μWh cm−2) at a power density of 752 W kg−1 along with 93% cycling stability over 10,000 cycles. Therefore, such a m-WO3/Ti3C2Tx/HGF electrode should be promising for the fabrication of advanced supercapacitors.