Highly stabilized alpha-NiCo(OH)2 nanomaterials for high performance device application

Abstract

h i g h l i g h t s g r a p h i c a l a b s t r a c t < Fully nanostructured high charge capacity materials. < Chargeedischarge over 700 times without charge capacity loss. < First stable alpha-nickel hydroxide nanomaterials. a b s t r a c tImproving the charge capacity, electrochemical reversibility and stability of anode materials are main challenges for the development of Ni-based rechargeable batteries and devices. The combination of cobalt, as additive, and electrode material nanostructuration revealed a very promising approach for this purpose. The new a-NiCo mixed hydroxide based electrodes exhibited high specific charge/discharge capacity (355e714 C g À1 ) and outstanding structural stability, withstanding up to 700 redox cycles without any significant phase transformation, as confirmed by cyclic voltammetry, electrochemical quartz crystal microbalance and X-ray diffractometry. In short, the nanostructured a-NiCo mixed hydroxide materials possess superior electrochemical properties and stability, being strong candidates for application in high performance batteries and devices.

Fast and Reversible Actuation of Metallic Muscles Composed of Nickel Nanowire‐Forest

“…[31] suggests that the anodic/catholic peaks in Figure 3a can be attributed to the redox reaction Ni(II) ↔ Ni(III). The Ni(II) adlayer, which persist at the more negative potentials of our scans, may have been formed when the AAO template was removed by NaOH solution.…”

Nanostructured Alpha‐Nickel Hydroxide Electrodes for High Performance Hydrogen Peroxide Sensing

“…A suspension of colloidal a-Ni(OH) 2 was prepared as previously described in the literature [13,20,21]. Nickel acetate tetrahydrate was solubilized in 25 mL of anhydrous glycerol, at 50 8C, under stirring.…”

Diaphragm‐Regulated Growth of Nanosheet Arrays of α‐Phase Ni–Co Layered Double Hydroxides on Arbitrary Substrates for Wettability Control and Rechargeable Alkaline Batteries

“…Although water molecules are not intercalated to balance charge, the lattice stability could be enhanced by water molecules forming a network of hydrogen bonds . The unique structures make LDHs particularly attractive as electrode materials for batteries and capacitors . Bimetallic LDHs generally possess superior electrochemical performances as compared to single metallic LHs due to multiple oxidation states, synergistic effects and improved conductivity …”

“…For example, bimetallic Ni 1‐ y Co y (OH) 2 exhibited improved stability and conductivity as compared to Ni(OH) 2 . In another example, α‐Ni(OH) 2 electrodes are not stable in alkaline medium, which causes capacity fading observed in alkaline batteries.…”

“…Bimetallic nickel–cobalt layered double hydroxides (Ni–Co LDHs) are promising candidates for batteries and supercapacitors . However, it is still a challenging task to facilely synthesize Ni–Co LDHs on substrates at room temperature.…”