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Porous carbons from nonporous MOFs: Influence of ligand characteristics on intrinsic properties of end carbon

机译:无孔MOF中的多孔碳:配体特性对末端碳固有性质的影响

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摘要

Synthesis of porous carbons on direct carbonization of nonporous Zn-based MOFs has been achieved without using any additional carbon precursor. The effect of ligand nature on the resulting carbon porosity has been studied systematically using the MOFs synthesized from rigid and flexible ligands. The linear relations between Zn/C ratio of the MOF versus surface area of the resulting carbon, microporosity versus H_2 uptake achieved in these carbons, and surface area versus specific capacitance of the end carbons have been verified from the gas adsorption, molecular composition, and electrochemical studies, respectively. Cyclic voltammetry and charge-discharge cycling have been carried out to study the capacitive behavior of the carbons. The interdependence of capacitive behavior on the surface area has been analyzed using data derived from N_2 adsorption isotherms and charge-discharge curves. Among the carbons synthesized, C-MOF-2 shows maximal surface area of 1378 m~2/g with a specific capacitance of 170 F/g at 1 A/g.
机译:在不使用任何其他碳前驱体的情况下,已经实现了基于无孔Zn基MOF的直接碳化的多孔碳合成。已使用由刚性和柔性配体合成的MOF系统地研究了配体性质对所得碳孔隙率的影响。已通过气体吸附,分子组成和吸附量验证了MOF的Zn / C比与所得碳的表面积,这些碳中实现的微孔率与H_2吸收之间的线性关系以及最终碳的表面积与比电容之间的线性关系。分别进行电化学研究。已经进行了循环伏安法和充放电循环研究碳的电容行为。使用从N_2吸附等温线和充放电曲线得出的数据分析了电容行为在表面积上的相互依赖性。在合成的碳中,C-MOF-2的最大表面积为1378 m2 / g,在1 A / g时的比电容为170 F / g。

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