The fine control of porous pompon-like Mg-incorporated α-Ni(OH)₂ for enhanced supercapacities

Abstract

Uniform porous pompon-like Mg-incorporated [Formula: see text]-Ni(OH)2 were designed and synthesized by a facile co-precipitation method. The results of ICP, XRD, FESEM, EDS and N2 adsorption/desorption isotherms revealed that Mg[Formula: see text] in the Ni(OH)2 lattice had a significant effect on the physicochemical and electrochemical properties. The enhanced chemical stability, high specific capacitance of 1647 F g[Formula: see text], excellent rate capability and long cycle life with capacitance retention of 82.0% after 1000 cycles were obtained for Mg-incorporated samples.

α- and β-Phase Ni-Mg Hydroxide for High Performance Hybrid Supercapacitors

“…The results show that the appropriate amount of Mg doping can enhance the specific capacitance of Ni(OH) 2 . One possible reason is that the appropriate amount of stable Mg(OH) 2 in alkaline electrolyte could increase the specific surface area, interlayer distance and pore volume [22]. The ICP results show that the two phase NiMg-OH synthesized Via this unique method are 10.35% (α-NiMg-OH) and 6.63% (β-NiMg-OH).…”

“…However, α-Ni(OH) 2 tends to convert to β-Ni(OH) 2 in alkaline solution or when subjected to charge-discharge cycles [20]. Doping or partially substituting with other metal ions, such as Mg [21,22], Al [23][24][25][26], Mn [27], Fe [4], Co [28][29][30][31][32] or Zn [33] in α-Ni(OH) 2 has found to be an effective way to stabilize the crystal structure; the resulting complex nickel hydroxides have demonstrated much improved electrochemical properties and performance when used as electrodes in supercapacitors. For example, α-phase NiCoMn hydroxide demonstrated high power densities and high energy [34], CoAl hydroxide possessed enhanced electrochemical performance [35,36].…”

Magnesium Cobaltite Embedded in Corncob-Derived Nitrogen-Doped Carbon as a Cathode Catalyst for Power Generation in Microbial Fuel Cells

“…45 This unique morphology exposes the catalyst surface and provides electroactive sites for ORR, increasing the utilization of cobalt. 46 Uniform distribution of agglomerated growth from nanorods to a flower-like morphology and thin nanowires over a carbon sheet is obtained (Figure 4c). MgCo 2 O 4 conducting nanostructures serve as redox sites and electron transport networks, while carbon sheets enhance the interfacial area for a favorable ORR process at the cathode.…”

“…This unique morphology exposes the catalyst surface and provides electroactive sites for ORR, increasing the utilization of cobalt . Uniform distribution of agglomerated growth from nanorods to a flower-like morphology and thin nanowires over a carbon sheet is obtained (Figure c).…”

High mass loading NiCo–OH nanothorns coated CuO nanowire arrays for high-capacity nickel–zinc battery

“…In general, the transition metal combinations can be divided into two categories [7]. One is the bimetallic hydroxides consists of electrochemically unreactive metal and electroactive metal (such as Al [8], Mg [9], Mo [10] etc). Although the unreactive metal ions do not participate in the charge/discharge reaction, the cycling performance of the active material can be improved because of avoiding the instability of the mechanical structure.…”