Nickel niobate is a

complex oxide A complex oxide is a chemical compound that contains oxygen and at least two other elements (or oxygen and just one other element that's in at least two oxidation states). Complex oxide materials are notable for their wide range of magnetic and el ...

which as a solid material has found potential applications in catalysis and lithium batteries.

Properties

Complexes

Nickel niobate has been added to other elements forming bismuth nickel niobate (), providing a dense ceramic body at low sintering temperatures. Cubic pyrochlore, tetragonal pyrochlore, and other unknown phases were found. Single-phase perovskite ceramics of (PNN) have been prepared by the columbite precursor method. Dielectric studies showed that ceramic is a typical

relaxor ferroelectric Relaxor ferroelectrics are ferroelectric materials that exhibit high electrostriction. , although they have been studied for over fifty years, the mechanism for this effect is still not completely understood, and is the subject of continuing resea ...

with properties like those of its single-crystals.

Applications

Nickel niobate has been examined for use as a catalyst to reduce 4-nitrophenol due to a photo-synergistic effect that exploits the synergy between thermal active sites and photogenerated electrons. Nickel niobate has also been examined in an "open and regular" crystalline form for use as the anode in a lithium ion battery. It forms a porous, nano-scale structure that eliminates the dendrite formation that can cause

short circuits A short circuit (sometimes abbreviated to short or s/c) is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance. This results in an excessive current flowing through the circuit. ...

and other problems. The material offers energy density of 244 mAh g−1 and retains 80%+ of its capacity across 20k cycles. The manufacturing process is straightforward and does not require a clean room. The anode offers a diffusion coefficient of 10−12 cm2 s−1 at 300 K, which allows fast charging/dischargine at high current densities, yielding capacities of 140 and 50 mAh g−1 for 10 and 100C respectively.

References

External links

* * * {{Cite journal, date=2001, editor-last=Robert, editor-first=G., editor2-last=Maeder, editor2-first=M. D., editor3-last=Damjanovic, editor3-first=D., editor4-last=Setter, editor4-first=N., title=Synthesis of lead nickel niobate-lead zirconate titanate solid solutions by a B-site precursor method, url=https://infoscience.epfl.ch/record/89025?ln=en, journal=Journal of the American Ceramic Society, volume=84, issue=12, pages=2869–2872, doi=10.1111/j.1151-2916.2001.tb01107.x, issn=0002-7820 Nickel compounds Nickel complexes Battery (electricity) Catalysts Niobates