Co(OH)₂ nanosheets anchored on CoB nanochains with enhanced electrochemical performance

A facile synthetic route based on the assistance of magnetic field is reported to fabricate core–shell CoB@Co(OH)₂ nanochains for purpose of the high conductive pathway and enhanced pseudocapacitance in 3 M LiOH electrolyte. By adjusting the loading amount of the shell Co(OH)₂ nanosheets anchored on the core CoB alloy surface, the typical core–shell CoB@Co(OH)₂ is endowed with the appropriate pore volume of 0.27 cm³ g⁻¹ and the high accessible electrode/electrolyte interfacial area (62.3 m² g⁻¹) and the fast conductive highway; meanwhile taking advantages of core–shell structure can be favor for fast ion transport between the electrode/electrolyte interphase and rapid electron transfer. Benefiting from the advantageous properties, the typical CoB@Co(OH)₂ electrode exhibits a high specific capacitance of 492.8 F g⁻¹ in three-electrode device together with good cyclic stability (90.4% capacitance retention) during continuously 5000 cycles at 2 A g⁻¹. This work can provide an inspiring strategy for rational designing of core–shell CoB@Co(OH)₂, and indicate their potential energy application in alkaline electrolyte.