Preparation and enhanced supercapacitance performance of carbonized silk by feeding silkworms MoO2 nanoparticles

Synthesis and Processing of Nanomaterials Mediated by Living Organisms

“…A similar trend is observed for feeding with metal oxide NPs, which in this case are mostly based on TiO 2 [44, 60, 61] but there are also specific examples with F 3 O 4 , [49] MoS 2 [61] or MoO 2 [62, 63] NPs. For instance, the excellent UV‐absorbing ability of TiO 2 led to UV‐resistant silks, [44] the magnetic properties of F 3 O 4 provided intrinsically magnetic silk, [49] and MoO 2 NPs led to an enhancement of specific capacitance in carbonized silk [62, 63] …”

“…While the mechanical improvements of the silk in these cases do not match those from carbon‐based NMs (Figure 3 c,d), the actual benefits lie in the conferral of new properties such as a potent antibacterial effect [57, 58] or the electricity harvesting from silk cocoons [59] . A similar trend is observed for feeding with metal oxide NPs, which in this case are mostly based on TiO 2 [44, 60, 61] but there are also specific examples with F 3 O 4 , [49] MoS 2 [61] or MoO 2 [62, 63] NPs. For instance, the excellent UV‐absorbing ability of TiO 2 led to UV‐resistant silks, [44] the magnetic properties of F 3 O 4 provided intrinsically magnetic silk, [49] and MoO 2 NPs led to an enhancement of specific capacitance in carbonized silk [62, 63] …”

“…This has been corroborated by some authors using specific characterization techniques. For instance, CNTs and graphene have been detected within the silk by Raman spectroscopy, [51, 52] and metal NPs by ICP‐MS and advanced electron microscopy techniques [58, 60, 62] . However, most authors agree that most of the NMs fed to the silkworms are expelled in their excrement [44, 45, 51, 52, 57, 58] .…”

Formation of hollow MoO 2 @C nano‐octahedrons using polyoxometalate‐based metal‐organic framework as a template for enhanced lithium‐ion batteries

“…At high current density, the diffusion of ions into the pores of the electrode material is controlled by the surface of the electrode. In addition, hollow MoO 2 @C nano‐octahedrons support shorter electrolyte diffusion path lengths vertically, provide parallel electron transport paths, and may adjust the gaps between each graphene layer to allow more electrolyte ions to penetrate the composite 84 . The Nyquist plots for the as‐obtained electrode show a lower equivalent series resistance (Rs) of ∼0.715 Ω in Figure S9d.…”

Animal Silk-Derived Amorphous Carbon Fibers for Electricity Generation and Solar Steam Evaporation

“…This situation forces the scientific and industrial communities to look for carbon fiber precursors from the nature instead of relying on synthetic polymer fibers, such as polyacrylonitrile (PAN). Indeed, in these years, carbon materials from natural sources have been widely reported (Fu et al, 2017 ; Jeon et al, 2017 ; Xu N. et al, 2017 ; Wang et al, 2019 ; Liang et al, 2020 ). Apart from the advantages of sustainability, the advantages of nature-sourced carbon fibers in the mechanical and electric properties have also been noticed (Wang et al, 2017 , 2019 ; Xu N. et al, 2017 ).…”