Facile, Sustainable, and Chemical-Additive-Free Synthesis of Monodisperse Carbon Spheres Assisted by External Pressure

Abstract

Strict control of the size uniformity of carbon spheres is a prerequisite for many applications. However, there has been a long-standing challenge to design and synthesis of high-quality glucose-derived carbon spheres with outstanding size uniformity. In this Letter, we report a facile, sustainable, and chemical-additive-free method for the external pressure-assisted synthesis of monodisperse hydrothermal carbon spheres (MHCSs). The MHCSs obtained with the introduction of moderate pressure (2.0 MPa) exhibited good uniformity for carbon nanospheres (<100 nm) which can also be obtained by simply adjusting the external pressure.

Insights into the diverse precursor-based micro-spherical hard carbons as anode materials for sodium–ion and potassium–ion batteries

“…Their unique structure gives high packing density and low surface area to volume ratio with good structural stability. 38,39 A few diverse synthetic techniques such as the Microwave-assisted method, 38,40,41 hydrothermal, 36,[42][43][44][45] solvothermal, 46,47 and other new routes [48][49][50][51] were employed for HC synthesis.…”

Insights into the Plateau Capacity Dependence on the Rate Performance and Cycling Stability of a Superior Hard Carbon Microsphere Anode for Sodium-Ion Batteries

“…HCMS anodes provide a high packing density and low surface areato volume ratio with excellent structural stability. 27,28 The synthesis reports on HCMS are mainly based on hydrothermal reactions, 29 polymerizations, 30 or pyrolysis of diverse precursors. 31,32 Jian et al made an HCMS from sugar precursors and achieved a capacity retention of 83% after 100 cycles.…”

“…HCMS anodes provide a high packing density and low surface areato volume ratio with excellent structural stability. , The synthesis reports on HCMS are mainly based on hydrothermal reactions, polymerizations, or pyrolysis of diverse precursors. , Jian et al made an HCMS from sugar precursors and achieved a capacity retention of 83% after 100 cycles . Monodisperse and hollow carbon spheres synthesized as anode materials were studied by Gil-Herrera et al Kim et al prepared nanocarbon with a turbostratic structure to obtain a reversible capacity of ∼310 mAh g –1 at a 0.1C rate …”