Prior vacuuming for supercritical fluid synthesis of SnO2/graphene nanocomposites with superior electrochemical Li+ storage performance

Supercritical CO2‐Assisted SiOx/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

“…R e , R ct , CPE, and W represent the electrolyte resistance, charge transfer resistance, interfacial constant phase element, and Warburg impedance associated with Li + diffusion within the electrode, respectively. [ 32 ] As shown in Table 2 the R ct values are 43, 28, 31, and 33 Ω for the T‐G, SC‐G, SC‐S, and SC‐CA electrodes, respectively. SC‐G having the lowest impedance of charge transfer can be attributed to its superior carbon coating quality and optimal conductivity.…”

“…In addition, SCCO 2 fluid can act as a precursor carrier for the fabrication of various nanomaterials. For example, nano‐size Ni, [ 27 ] Fe, [ 28 ] Pd, [ 22 ] Pt, [ 29 ] Au, [ 30 ] MnO 2 , [ 31 ] SnO 2 , [ 32 ] V 2 O 5 , [ 33 ] Fe 3 O 4 , [ 34 ] Co 3 O 4 [ 35 ] have been synthesized and anchored on various nanostructured carbon materials. In addition, our team has demonstrated that SCCO 2 itself can serve as the precursor in the synthesis of a highly porous CoCO 3 /graphene nanocomposite anode for Li + and Na + storage.…”

Flexible yet Robust Framework of Tin(II) Oxide Carbodiimide for Reversible Lithium Storage

“…From the slopes of the fitting lines collected from peak current densities ( I pa ) (Figure 4 e), the apparent diffusion coefficients ( D ) of Sn 2 O(CN 2 ) are calculated to be 1.90×10 −9 and 2.99×10 −9 cm 2 s −1 for anodic and cathodic processes, respectively. These coefficients are larger than that of the reported SnO 2 ‐based materials, [36–39] which indicates the advantage of flexible yet robust framework in Sn 2 O(CN 2 ).…”

“…where I p is the peak current (the alloyingp eaks are used to calculate in this work), R is the gas constant( 8.314 Jmol À1 K À1 ), T is the absolute temperature, F is the Faradayc onstant (96 500 Cmol À1 ), n is the number of electrons transferred per molecule (8.8), A is the active surfacea rea of the electrode (0.78 cm 2 ), C 0 is the concentration of Li ions in the electrolyte (1.0 10 À3 mol cm À3 ), D is the apparent diffusion coefficients (cm 2 s À1 ), and v is the scanning rate (V s À1 ). From the slopes of the fittingl ines collectedf rom peak currentd ensities( I pa )( Figure 4e), the apparent diffusion coefficients (D)o fS n 2 O(CN 2 )a re calculated to be 1.90 10 À9 and2 .99 10 À9 cm 2 s À1 for anodic and cathodic processes,r espectively.T hese coefficients are larger than that of the reportedS nO 2 -based materials, [36][37][38][39] which indicates the advantage of flexible yet robust framework in Sn 2 O(CN 2 ). Based on results above,w econceived the reaction mechanisms of SnO 2 andS n 2 O(CN 2 )e lectrodes in Figure 5b,c.…”

Supercritical carbon dioxide assisted formation of crystalline materials for various energetic applications

“…Tin oxide (SnO 2 ) modified multi-walled carbon nanotubes (MWCNT), 37 graphene nanosheets (GNSs) 38,39 and carbon nanotubes (CNTs) 39 were synthesized via oxidation of SnCl 2 ·2H 2 O in a scCO 2 /alcohol mixture. Patra et al 39 prepared in SCF-medium 1 nm scaled SnO 2 particles uniformly dispersed and tightly anchored on GNSs and CNTs (Fig.…”