Materials Mutualism through EDLC-Behaved MWCNTs with Pseudocapacitive MoTe₂ Nanopebbles: Enhanced Supercapacitive Performance

Abstract

Present innovation emphasizes the design and development of hybrid nanoarchitecture by using simple twostep chemical routes, namely, "dip and dry", for multiwalled carbon nanotubes (MWCNTs) followed by coating of molybdenum telluride (MoTe 2 ) nanopebbles using successive ionic layer adsorption and reaction (SILAR) to form a thin film onto flexible stainless steel (SS) substrate toward the fabrication of a symmetric solid-state and flexible supercapacitor device. The MWCNTs/MoTe 2 nanostructured composite exhibits strong synergy and materials mutualism between electric double-layer capacitive (EDLC) behaved MWCNTs and pseudocapacitive MoTe 2 leading to the enhanced supercapacitive performance. Interestingly, the formed unique nanoarchitecture offers an excellent charge-storing capability of 502 F/g as the specific capacitance at 2 mV/s in liquid configuration with excellent rate capability and cyclic stability. The formed flexible complete solid-state symmetric supercapacitor (FCSS-SC) device using two SS/MWCNTs/MoTe 2 electrodes with poly(vinyl alcohol)-lithium perchlorate (PVA-LiClO 4 ) gel electrolyte as a mediator has demonstrated an upgraded potential window resulting in superior capacitance and energy density. Additionally, mechanical flexibility, cyclic stability, and hands-on application by a glowing light-emitting diode (LED) can attract the value of the formed device toward the advanced energy storage meadow.

Lichen-like anchoring of MoSe2 on functionalized multiwalled carbon nanotubes: an efficient electrode for asymmetric supercapacitors

“…3c) showed two distinct peaks at 234.2 and 237.3 eV, indicating that the oxidation state of Mo was 4+. 32,39,[44][45][46] In addition, Fig. 3d shows the Se 3d XPS prole of the lm.…”

“…Owing to their one-dimensional (1D) structure, large surface area, good chemical stability, and mechanical exibility, multiwalled carbon nanotubes (MWCNTs) are considered as the most promising matrix materials for supporting the host materials. [38][39][40] Furthermore, the 1D structure of MWCNTs provides good electrical conductivity and efficient electron transfer pathways. In addition, the MWCNT surface reduces the aggregation of the host material.…”

CuCo LDHs Coated CuCoTe Honeycomb‐Like Nanosheets as a Novel Anode Material for Hybrid Supercapacitors

“…[ 31 ] Several other studies on Te based supercapacitors also succeeded in obtaining good electrochemical performances. [ 32,33 ] Performance of these monometal tellurides can still be improved by devising bimetallic tellurides to facilitate rich redox reactions and store abundant charges. Recently, a few research groups including ours have implemented the idea of bimetallic tellurides to obtain high‐performance supercapacitors.…”

Multi‐walled carbon nanotubes supported copper phosphate microflowers for flexible solid‐state supercapacitor

“…Incessant starvation for high energy outputs is constantly driving the present research trend toward a new era of advanced energy storage materials through innovations in their design and structural engineering at the nanoscale. In the current age of functional nanomaterials for high‐performance supercapacitors, the biologically borrowed concept of “mutualistic symbiosis” is considered to be a viable approach by integrating different types of electrochemically active entities in a harmonious way within a super‐architectural design that explores holistic system benefitting as a whole from the constituents 1 . In regards to supercapacitors, the idea of material reciprocity (mutualism) advantageously accompanies both physical (electric double‐layer capacitance) and chemical (pseudocapacitance) charge storage mechanisms of large surface area carbonaceous and high capacitive pseudoactive materials, respectively, through designing of multifaceted nanostructured hybrid‐composite materials 2 …”