Modificationally doped Se element and in-situ doped V element to elevate the supercapacitor performance of Co-MOF

Abstract

Metal-organic skeleton (MOF) with adjustable pore skeleton and finely reaction sites has been widely accepted in the application of high-performance supercapacitors. Here, the Se-Co-MOF-1 nano-particles obtained by modified doped Se element to Co-MOF and the CoV₃-MOF nano-sheets obtained by in-situ doped V element in Co-MOF. As a result, Se-Co-MOF-1 and CoV₃-MOF electrode materials have more electrochemical reactivity, better conductivity and better stability. At a certain current density, Se-Co-MOF-1 and CoV₃-MOF electrode materials have better mass-specific capacitance and better rate performance than Co-MOF. Furthermore, the Se-Co-MOF-1//AC ASC and CoV₃-MOF//AC ASC are also assembled, which show relatively excellent power density and energy density compared to similar work reported. The Se-Co-MOF-1//AC ASC and CoV₃-MOF//AC ASC after 10,000 cycles, their mass-specific capacitance retention rate are still 70.00 %, which further shows the reliable stability of Se-Co-MOF-1 and CoV₃-MOF electrode materials. This result proves that the synthetic schemes of MOF nano-sheets/nano-particles can be selected as the source of the strategy for preparing excellent electrode materials.