Low-Cost Hydrothermal Synthesis of Porous Carbon Spheres with Tunable Particle Size
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Spherical porous carbon particles find applications in gas storage, biological and medical sorbents, energy storage devices and other demanding applications. At the same time, the common routes for their synthesis are elaborate and costly. Here we report on our study of a low-cost synthesis of spherical carbons with uniform and tunable diameter. The application of a lowtemperature hydrothermal process greatly accelerates the rate of cross-linking within polymer precursors, allowing formation of individual spherical carbon particles upon subsequent polymer carbonization. By reducing the precursor concentration we have demonstrated particle size reduction from 1,250 to 140 nm. The as-produced particles exhibit disordered microstructure with very smooth particle surface and open internal micro-porosity.