The MOF-originated NiCu-POx/NGQD for efficient supercapattery devices and hydrogen evolution reaction
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY(2023)
摘要
Due to the high viability of electrochemical energy resources and their storage techniques in the present climate, supercapacitors and water-splitting electrolysis have seen dramatically increased attention in modern days. We presented the synthesis of nickel-copper phosphate (NiCu-POx) nanosheets from the phosphorization of the nickel-copper metal-organic framework (NiCu-MOF) at a limited temperature. Further, the addition of nitrogen-doped graphene quantum dots (NGQD) in the Ni–Cu-POx was also studied. SEM, XRD, and XPS were used to analyze the structural and elemental composition of the synthesized materials. Further, Brunauer-Emmett-Teller (BET) measurements showed an enhancement in surface area when NGQDs were introduced into the heterostructure of NiCu-POx. An extraordinary value of specific capacity (1431 C-g−1 at 1.4 Ag-1) was achieved with NiCu-POx/NGQDs. Supercapattery device (NiCu-POx/NGQDs//PANI@AC) was fabricated with polyaniline doped activated carbon as the negative and NiCu-POx/NGQDs as the positive electrode. The specific capacity of the real device (NiCu-POx/NGQDs//PANI@AC) was 224 C-g−1 at 2.0 Ag-1. The energy density for this asymmetric device (NiCu-POx/NGQDs//PANI@AC) was 73 Whkg−1 at 980 Wkg-1 power density. The device (NiCu-POx/NGQDs//PANI@AC) was subjected to 10,000 charge-discharge cycles to test its durability. After 10,000 cycles NiCu-POx/NGQDs//PANI@AC demonstrates an outstanding 86% reservation of capacity. The NiCu-POx/NGQDs showed a small overpotential of 138 mV during the 24 h HER test. According to our findings, NiCu-POx/NGQDs proved to be a suitable electrode material for prospective supercapattery and HER applications.
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关键词
NiCu-MOF,NiCu-POx,NiCu-POx/NGQD heterostructure,Supercapattery,Hydrogen evolution reaction
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