Order Mesoporous Carbon Spheres with Precise Tunable Large Pore Size by Encapsulated Self‐Activation Strategy

Abstract

Order mesoporous carbon spheres (O‐MCS) have wide applications in catalysis, absorption, and energy storage/conversion due to their ordered mesoporous channels, large surface areas, and quantum effects in the nanoscale. However, realizing a precise control of large mesoporous size still remains a big challenge. Herein, an encapsulated self‐activation strategy to prepare highly ordered mesoporous carbon spheres with precise tunable large pore sizes is first reported. The large mesopore size is achieved by encapsulating mesoporous polymer sphere in compact silica shell for pyrolysis process. Moreover, the self‐activation mechanism endows the O‐MCS high surface area, large mesoporous size, and pore volume. In addition, simply increasing the amount of silica precursor will enlarge the pore sizes of O‐MCS from 3.1 to 10.0 nm with increased specific surface area from 696 to 1186 m2 g−1. The large order mesoporous structure of O‐MCS, which can facilitate diffusion of guest molecules in the channels exhibit great advantage in the adsorption and electrochemical applications.

Tuning Confined Nanospace for Preparation of N‐doped Hollow Carbon Spheres for High Performance Supercapacitors

“…Upon coating with mesoporous silica shell, the in situ generated gases (e.g CO 2 , H 2 O etc. ) derived from the pyrolysis of PSPAN could escape easily. Thus, the HCS derived from PSPAN after etching the pore walls of the silica shell has a high specific surface area and a larger mesopore size (Figure a).…”

Recent advances in carbon-based supercapacitors

“…7a). 85 Choy's group recently proposed a cost-effective geopolymer approach to obtain an appropriate mesopore ratio in carbons, and natural clay as the silica supplier for lab-made geopolymer templates was B400 times cheaper as compared to TEOS. 86 With regard to direct soft-template strategies, tunable mesostructures can be generated based on the cooperative assembly between the precursor molecules and single-chain surfactants/ block copolymers as sacrificial organic templates.…”

Strategies to Enhance the Performance of Electrochemical Capacitors Based on Carbon Materials

“…These are named as ordered mesoporous carbons (OMCs), which are prepared using a hard or soft template (ZnO,copolymer F127,etc. ) (Zhou et al, 2003;Li et al, 2007Li et al, , 2011Liu et al, 2011;Jiang et al, 2014;Du et al, 2018;Yoshida et al, 2018), and have achieved remarkable electrochemical performance at high current densities, but their relatively low SSA limits the capacitance value. Alternatively, Itoi et al (2011) used the zeolite Y as template, obtaining a zeolite-templated carbon (ZTC) with interconnected pores and a high SSA (∼3,000 m 2 g −1 ).…”