Development of a novel method to grow mono-/few-layered MoS₂films and MoS₂–graphene hybrid films for supercapacitor applications

Abstract

The controlled synthesis of highly crystalline MoS 2 atomic layers remains a challenge for practical applications of this emerging material. We demonstrate a facile method to synthesize crystalline mono-layer / few-layered MoS 2 thin films at liquid-liquid interface which can be suitably transferred on substrates. The films are characterized for its crystal structure by XRD and for the morphology by SEM and TEM. MoS 2 nanosheet-graphene nanosheet (MoS 2 -GNS) hybrid films have been developed by the application of layer-by-layer (LbL) technique. Cyclic voltametry and other electrochemical characterization techniques reveal that the hybrid film electrode shows 10 specific capacitance of 282 Fg -1 at a scan rate of 20 mVs -1 . The as-obtained hybrid electrode is robust and exhibits much improved cycle life (> 1000), retaining over 93 % of its initial capacitance as revealed by galvanostatic charge/discharge studies. The confirmation of better performance as a supercapacitor of the composite was studied by Electrochemical Impedance Spectroscopy. These results indicate that MoS 2 -GNS hybrid is a promising candidate for the electrode material in supercapacitor applications. 15 Chemicals 110All of the reagents used herein were of analytical grade and used as received without any further purification. Molybdenum disulfide (MoS 2 , 99.9%) and graphite rod (99.99 %) were purchased from Sigma-Aldrich Ltd. Conc. Sulfuric acid (H 2 SO 4 , 115 98%), Sodium Sulphate (Na 2 SO 4 ) and oleic acid (99% by GC)

Programmable Nanocarbon‐Based Architectures for Flexible Supercapacitors

“…[204][205][206][207][208][209][210][211][212] The common transition metal sulfi des used as pseudocapacitive electrodes are MoS 2 , WS 2 VS 2 and NiCo 2 S 4 . [213][214][215][216][217][218] Furthermore, transition metal sulfi des can also be added into nanocarbon architectures to serve as fl exible SC electrodes. [ 214,219 ] Because different transition metal oxides/ hydroxides have been successfully prepared in the graphene/CNTs composite architectures, asymmetric SCs can be obtained using these composite architectures as electrodes.…”

“…[213][214][215][216][217][218] Furthermore, transition metal sulfi des can also be added into nanocarbon architectures to serve as fl exible SC electrodes. [ 214,219 ] Because different transition metal oxides/ hydroxides have been successfully prepared in the graphene/CNTs composite architectures, asymmetric SCs can be obtained using these composite architectures as electrodes. [220][221][222][223][224][225] For example, the asymmetric SCs assembled by rGO/CNT/MnO 2 and rGO/ CNT/PPy hybrid fi lms are able to provide an output voltage of 1.6 V, and deliver high energy/power density (22.8 W h kg −1 at 860 W kg −1 and 2.7 kW kg −1 at 6.2 W h kg −1 ).…”

Supercapacitors based on patronite–reduced graphene oxide hybrids: experimental and theoretical insights

“…[16][17][18] Some of the TMCs like MoS 2 , SnS 2 , and WS 2 , have been studied extensively owing to their exceptional applicability in areas like electronics, 18-20 energy storage, [21][22][23][24] energy conversion, [25][26][27] optoelectronics etc. 39 Similarly WS 2 /RGO showed a specific capacitance of 350 F/g which is 5 times higher as compared to bare WS 2 . 30,31 They have been studied in their pristine form as well as hybrid form with graphene/reduced graphene oxide (RGO).…”

Facile construction of 3D graphene/MoS2 composites as advanced electrode materials for supercapacitors

“…For examples, Leite and coworkers developed a microwave-assisted route to fabricate a hybrid of MoS 2 /reduced graphene oxide with the specific capacitance of 265 F g À1 at 10 mV s À1 [24]. Patil and coworkers reported that the MoS 2 /graphene hybrid film electrode possessed a specific capacitance of 282 F g À1 at a scan rate of 20 mV s À1 [25]. Therefore, rational combination of MoS 2 with graphene can be expected as an ideal way to fabricate the electrode materials with excellent specific capacitance.…”