ZIF-derived mesoporous carbon materials prepared by activation via Na_(2)SiO_(3) for supercapacitor

摘要

Metal organic frameworks(MOFs)derived carbonaceous materials have a wide range of applications in the fields of energy storage,catalysis,adsorption and separation,etc.Especially,zeolitic imidazolate framework-8(ZIF-8)is an excellent candidate to synthesize porous carbon due to the large surface area and high nitrogen content.However,the dominated microporous structure of ZIF-8-derived carbon significantly hinders ionic mass trans fer,limiting the improvement of performance.Herein,MOF-derived mesoporous carbon was prepared using ZIF-8 as carbon precursor and cheap sodium silicate(Na_(2)SiO_(3))as activator.The introduction of Na_(2)SiO_(3) created rich mesoporous structure and increased specific surface area,as well as the effects of pyrolysis temperature and Na_(2)SiO_(3) dosage on performance was also investigated.The obtained ZIF-derived porous carbon exhibits good electrochemical performance with specific capacitance of 263 F/g at 1 A/g and excellent cycle life(96.07%after 10,000 GCD cycles)in supercapacitor.The use of cheap Na_(2)SiO_(3) activator provides a new orientation for the preparation of MOF-derived carbons with rich pores,high surface area,and facilitates the large-scale application of MOF-derived carbons.