Covalently Aligned Molybdenum Disulfide–Carbon Nanotubes Heteroarchitecture for High‐Performance Electrochemical Capacitors

Abstract

Advanced two-dimensional nanosheets that promote the dynamic transportation and storage capacity of ions are significant for high-performance electrochemical capacitors (ECs). However,s uch materials often possess al ow energy density.W eh ave developed an ordered heteroarchitecture of molybdenum disulfide-carbon nanotubes (MoS 2 -CNTs) in which CNTs are vertically grafted within aM oS 2 framework by CÀMo covalent bonds.B enefiting from this in situ vertical bridge,h igh-speed interlaminar conductivity,u nimpeded iondiffusion channels and sufficient pseudocapacitive reactivity, the MoS 2 -CNTs presents ultralarge capacitance (5485 Fg À1 ) and good structural stability in potassium hydroxidee lectrolyte.Moreover,the all-unified solid-state flexible ECs obtained through direct-write printing construction deliver high energy density (226 mWh g À1 ), good capacitance (723 Fg À1 )and stable high/low-temperature operating ability,w hich can power aw earable health-monitoring device.

Rational Design of NiCo-borate/GO Heterojunction as a High-Performance Supercapacitor Electrode

“…The CV curves exhibit distinct redox peaks, indicating Faradaic redox reactions. Ni 2.7 Co 0.3 -B/GO shows a significantly larger enclosed CV curve area compared to other Ni x Co 3– x -B/GO materials, indicating the highest C m and optimal electrochemical performance . The galvanostatic charge–discharge (GCD) curves of Co–B/GO, Ni–B/GO, Ni 2.7 Co 0.3 -B/GO, Ni 0.3 Co 2.7 -B/GO, Ni 2.1 Co 0.9 -B/GO and Ni 0.9 Co 2.1 -B/GO, are shown in Figures b and S9 at a current density of 1 A g –1 .…”