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)...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.展开更多
基金the National Natural Science Foundation of China(No.21676070)Hebei Province Introduction of Foreign Intelligence Projects(2018)+3 种基金Beijing National Laboratory for Molecular Sciences,Hebei Science and Technology Project(Nos.20544401D,20314401D)Tianjin Science and Technology Project(No.19YFSLQY00070)CAS Key Laboratory of Carbon Materials(No.KLCMKFJJ2007)Hebei Province 2020 Central Leading Local Science and Technology Development Fund Project(No.206Z4406G)。
文摘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.
