High Performance Metal Oxide–Graphene Hybrid Nanomaterials Synthesized via Opposite‐Polarity Electrosprays

Abstract

An opposite-polarity electrospray technique is developed to synthesize Mn O -graphene hybrid nanomaterial that shows high specific capacity, fast charging/discharging capability, and long cycle life for lithium storage. The approach offers nanoparticle size control and tunability, morphology control, versatility for the synthesis of different materials and hybrid structures from different precursors, and continuous-flow nanomanufacturing with the potential for full automation.

Biomimetic Synthesis of Ear‐of‐wheat‐shaped Manganese Oxide Nanoparticles on Carbon Nanotubes for High‐capacity Lithium Storage

“…The simulation results are shown in Table 1 . The R sei has little change during the first five cycles but is appreciably increased after 105 cycles, indicating the contribution of activated electrolyte on capacity rise upon cycling as also reported in literature 32,39. Moreover, the R ct is noticeably reduced from 429.4 Ω cm −2 to 311.8 Ω cm −2 and 57.5 Ω cm −2 after five cycles and 105 cycles, respectively.…”

Graphene-Roll-Wrapped Prussian Blue Nanospheres as a High-Performance Binder-Free Cathode for Sodium-Ion Batteries

“…When the solution consisting of Fe-HCF NSs and GO is quenched, the surface tension of absorbed water on GO sheet surface increases rapidly with decreasing temperature, which drives GO sheets self-scrolling forming 1D nanoroll structure. Importantly, Fe-HCF NSs have been encapsulated into the GO sheet rolls in a second during quenching. , …”

“…However, the PBAs side reactions with organic electrolyte still limit their sodium storage performance due to full/part surface exposure of Fe-HCF particles, which motivates us to fabricate a highly conductive matrix to encapsulate Fe-HCF particles impeding the Fe-HCF from contacting the electrolyte. As reported, graphene rolls (GRs), which consist of 1D tubular structure of 2D graphene nanosheets wrapping, are considered an effective strategy to guarantee material electroactivity. − Meanwhile, the typical tubular shape of GRs could effectively prevent electrolyte from reaching active materials. Therefore, such an encapsulation of the Fe-HCF NSs into GRs (Fe-HCF NSs@GRs) would greatly improve the electrochemical performance of Fe-HCF cathode, especially in long-life cycling stabilities.…”

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

“…Kodas and Hampden-Smith described aerosol-based processes for the production of materials, including reactive and non-reactive spray drying (Kodas et al, 1971;Messing et al, 1993;Wilhelm et al, 2003;Vehring, 2008). Some examples of reactive spray pyrolysis used for the production of oxide particles are detailed in (Rulison et al, 1994;Borra et al, 1997a;Okuyama et al, 1997;Chen CH et al, 1999;Lenggoro et al, 2000;Bastide et al, 2006;Jaworek et al, 2008;Shi et al, 2011;Xie et al, 2015;Tang J et al, 2016;Tang J et al, 2017a;Tang J et al, 2017b) and non-reactive drying of droplets leading to nano-particles from water based solutions in (Tang K et al, 1994b;Vehring, 2008;Maißer et al, 2013). Such nuclei are formed by nucleation or crystallization when the maximum solute concentration (solubility constant) is reached, either at the surface or in the volume of the droplet.…”

“…In that case, the kinetics of product formation in the droplet depends on the surface temperature and on reactants concentrations in the liquid interface, limited by slow diffusion from gas phase. Since the same chemical reactions can be induced in volume when two droplets with opposite polarities are mixed by electrocoalescence, positive and negative ES have been used to increase the apparent reaction rate between the same reactants dissolved in controlled relative concentrations in droplets produced by ES with opposite polarities, (Borra et al, 1997a;Camelot et al, 1998;Borra et al, 1999a;Verdoold et al, 2000;Jaworek et al, 2008;Verdoold et al, 2011;Fu et al, 2012;Liu Q et al, 2014a;Xie et al, 2015;Tang J et al, 2016;Tang J et al, 2017a). Recent production of "smart" composite materials are also based on the production of nanoparticles in liquid droplets, as described above, from drying and eventual reaction in the liquid drop but as well by the direct ES of nano-suspensions, i.e.…”