Hierarchically Structured rGO/MoS2 Flexible Films via Facile Synthesis for High Performance K-Ion Supercapacitors

Xuexue Pan; Zhazira Supiyeva; Seitkhan Azat; Aigul Tugelbayeva; Bekzat Khamzin; Qamar Abbas

doi:10.18321/ectj1680

Authors

Xuexue Pan Zhongshan Advanced New Functional Materials Engineering Technology Research Center, Guangdong Engineering Technology Research Center, Laboratory of Advanced Functional Materials, Zhongshan Polytechnic, 528400 Zhongshan, China; School of Energy Science and Technology, Henan University, 475004 Kaifeng, China; Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60965 Poznan, Poland
Zhazira Supiyeva Laboratory of Engineering Profile, Satbayev University, Almaty, Kazakhstan; Al-Farabi Kazakh National University, 71 al-Farabi Ave., 050040 Almaty, Kazakhstan; Institute of Combustion Problems, 172, Bogenbay batyr str., 050012, Almaty, Kazakhstan
Seitkhan Azat Laboratory of Engineering Profile, Satbayev University, Almaty, Kazakhstan
Aigul Tugelbayeva Laboratory of Engineering Profile, Satbayev University, Almaty, Kazakhstan
Bekzat Khamzin Laboratory of Engineering Profile, Satbayev University, Almaty, Kazakhstan; Al-Farabi Kazakh National University, 71 al-Farabi Ave., 050040 Almaty, Kazakhstan
Qamar Abbas Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60965 Poznan, Poland; Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria

DOI:

https://doi.org/10.18321/ectj1680

Keywords:

rGO/MoS2 composite, Pseudocapacitor, Supercapacitor, Volumetric capacitance, Energy density, Cycling

Abstract

This study presents a hierarchically structured, free-standing rGO/MoS₂ hybrid film fabricated through a facile vacuum filtration and thermal reduction approach, offering a cost-effective strategy for high-performance K-ion supercapacitors. The optimized composite architecture features nanoporous, layer-stacked channels and expanded interlayer spacing, enabling efficient ion diffusion and abundant electroactive sites. The rGO/MoS₂ electrode demonstrates exceptional capacitive performance, delivering a gravimetric capacitance of 378 F g^-¹ and a record volumetric capacitance of 787 F cm^-3 at 1 A g^-1, attributed to the synergy between the conductive rGO network and the pseudocapacitive properties of MoS₂. The symmetric supercapacitor cell assembled with rGO/MoS₂ electrodes and an aqueous electrolyte (3 mol L^-¹ KOH) demonstrated a high energy density of 7.6 mWh cm^-³ with power density of 0.36 W cm^-³, whereas supercapacitor with organic electrolyte (1 mol L^-¹ MeEt₃NBF₄) displayed 26 mWh cm^-³ at 1.4 W cm^-³. Both supercapacitors showed excellent cycling lifespan with capacitance retention of 100% after 480,000 and 270,000 cycles, respectively. These findings suggest the excellent electronic conductivity of rGO and the electrochemically active MoS₂ synergistically contribute to the outstanding supercapacitor performances.

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