Dinuclear cobalt-based pillar-layered-like MOF as an electrode material for supercapacitor and photocatalysis activity

A dinuclear cobalt-based pillar-layered-like metal-organic frameworks (MOFs), namely [Co-2(TPPA) (sdba)(2)](n) (1) has been synthesized hydrothermally (TPPA = tris(4-(pyridin-4-yl)phenyl)amine, H(2)sdba = 4,4'-sulfonyldibenzoic acid). MOF 1 features a two-fold interpenetrated CdSO4-type (cds) network. MOF 1 can be used as an electrode material for supercapacitors, the maximum specific capacitance is 75.7 F g(-1) at current density 0.5 A g(-1), while the maximum specific capacitance of the Co3O4 material with sheet-like nanoporous structure by calcination of 1 at 500 degrees C achieved 118.6 F g(-1) at current density of 0.5 A g(-1). The above two materials have excellent recycling stability, their capacitance retention can be kept at 94% and 97% after 3000 cycles at 1 A g(-1) in 3 M KOH electrolyte, respectively. In addition, MOF 1 also displays photocatalytic activity for the decomposition of RhB under UV irradiation, approximately 94% of RhB was decomposed after 60 min. (C) 2019 Elsevier Ltd. All rights reserved.