In Situ Pyrolysis Tracking and Real-Time Phase Evolution: From a Binary Zinc Cluster to Supercapacitive Porous Carbon

摘要

The in situ tracking of the pyrolysis of a binary molecular cluster [Zn-7(mu(3)-CH3O)(6)(L)(6)][ZnLCl2](2) is presented with one brucite disk and two mononuclear fragments (L=mmimp: 2-methoxy-6-((methylimino)-methyl)phenolate) to porous carbon using TG-MS from 30 to 900 degrees C. Following up the spilled gas product during the decomposed reaction of zinc cluster along the temperature rising, and in conjunction with XRD, SEM, BET and other materials characterization, where three key steps were observed: 1) cleavage of the bulky external ligand; 2) reduction of ZnO and 3) volatilization of Zn. The real-time-dependent phase-sequential evolution of the remaining products and the processing of pore forming template transformation are proposed simultaneously. The porous carbon structure featuring a uniform nano-sized pore distribution synthesized at 900 degrees C with the highest surface area of 1644 m(2) g(-1) and pore volume of 0.926 cm(3) g(-1) exhibits the best known capacitance of 662 F g(-1) at 0.5 A g(-1).