Cost effective urea combustion derived mesoporous-Li₂MnSiO₄as a novel material for supercapacitors

Abstract

Mesoporous Li2MnSiO4 (LMS) with a surface area of 35 m2/g is produced by urea combustion using a HNO3 solution of LiNO3, Mn(OAc)2, and Si(O‐Et)4.

Facile and One-Step in Situ Synthesis of Pure Phase Mesoporous Li2MnSiO4/CNTs Nanocomposite for Hybrid Supercapacitors

“…Thus, we have attempted to prepare pure phase LMS and accordingly, a mechanism is proposed for the first time to the best of our knowledge. Further, pure phase LMS prepared by us showed mesoporosity and higher specific surface area (104 m 2 g –1 ), in comparison to previously synthesized pristine orthosilicates. ,− However, the poor intrinsic conductivity of LMS was still a challenge. To address this issue, nanocomposites of LMS with MWCNT S have been prepared.…”

“…39 For LMSP, weight loss from temperature range 300 to 450 °C is attributed to the growth of impurity phases, while noticeable weight gain in the graph beyond 600 °C is associated with the complete disintegration of LMSP into Li 2 SiO 3 and MnO 2 . 12 It is worthwhile to notice that by adding MWCNTs in the nanocomposites, percent weight gain beyond 600 °C decreases, which implies that structure of LMS is more thermally stable in LMS4C than that in LMSP, LMS1C, and LMS2C.…”

“…9 Moreover, synthesis of pure phase LMS is a necessary step to understand and resolves the causes which are hindering its commercial applicability. As of now, different synthesis techniques such as pechini sol−gel, 10 solid state method, 11 sol−gel combustion, 12 supercritical solvothermal, 13 microwave−solvothermal, 14 and hydrothermal, 15 have been adopted to synthesize LMS, doped LMS, and its various composites. However, pure phase formation of LMS is still not facile due to its various crystal structures/polymorphs and the formation of some impurity phases such as MnO, Li 2 SiO 3 , and Mn 2 SiO 4 in addition to LMS.…”

A Critical Review on Electrochemical Properties and Significance of Orthosilicate‐Based Cathode Materials for Rechargeable Li/Na/Mg Batteries and Hybrid Supercapacitors

“…The cell provided specific energy density of 43 Wh kg −1 and power density of 200 W kg −1 with excellent cycle life for 1000 cycles. The mesoporous morphology with orthorhombic Li 2 MnSiO 4 proposed as electrode material for HSC and it was exhibited a specific capacitance of about 175 F g −1 [240] . The Al 2 O 3 coated Li 2 MnSiO 4 nanocomposite was employed as an electrode material for HSC which showed the specific capacitance of 141.5 F g −1 and high‐power density of 4020.8 W kg −1 [241] .…”

“…The mesoporous morphology with orthorhombic Li 2 MnSiO 4 proposed as electrode material for HSC and it was exhibited a specific capacitance of about 175 F g À 1 . [240] The Al 2 O 3 coated Li 2 MnSiO 4 nanocomposite was employed as an electrode material for HSC which showed the specific capacitance of 141.5 F g À 1 and high-power density of 4020.8 W kg À 1 . [241] Recently, a multi-walled carbon nanotube (MWCNT) embedded mesoporous Li 2 MnSiO 4 nanocomposite was synthesised and used as an electrode material for a hybrid supercapacitor in the aqueous electrolyte solution (2 M KOH).…”