Highly Improved Electrochemical Reactions of Mesoporous Carbon Electrodes in Electrochemical Energy Storage and Conversion

摘要

We report mesoporous carbon electrodes prepared using silica template, carbonization process underCH4 atmosphere, and subsequent silica removal for improved electrochemical energy storage andconversion in lithium-ion batteries, capacitors, and fuel cells. The as-synthesized carbon electrodesexhibit mesoporous structures with the narrow size distributions corresponding to the replication of themesoporous SiO2 template. In particular, the meso-C-3 prepared by carbonization process under CH42 -1 atmosphere for 3 h exhibits relatively much higher surface area of 635.07 m g and pore diameter of~3.13 nm with the narrow size distribution corresponding to the replication of the meso-SiO2. Themeso-C-3 shows high charge capacity and high-rate performance during the Li intercalation due torelatively high surface areas and well-defined pores as a buffer to the local volume changes. Theimproved electrochemical double layer capacitance and oxygen reduction reaction activity of themeso-C-3 might be due to large accessible surface area and pore structure in the well-defined porouselectrode.