Figure 1From: Sulfur/graphitic hollow carbon sphere nano-composite as a cathode material for high-power lithium-sulfur batterySchematic diagram for the process to synthesize a graphitic hollow carbon sphere. (a) Homogenous mixture of silica sphere and Fe-Pc, (b) decomposition of Fe-Pc at 500°C to 600°C, (c) graphitization of carbon shell at 900°C by the catalytic action of Fe nanoparticles, and (d) hollow carbon sphere after HF etching.Back to article page