Co4NiO8
Co4NiO8 is a semiconducting complex oxide being studied for its potential utility as a catalyst in oxygen-evolution reactions.
About Co4NiO8
Co4NiO8 is a complex oxide belonging to the class of oxygen-evolution catalysts. As a semiconducting material, it represents an interesting subject for studying charge transport and catalytic activity in electrochemical systems. Its electronic nature makes it a candidate for investigation in energy conversion technologies where efficient oxygen production is required.
Despite its status as a metastable phase residing above the hull, this compound is documented across multiple structural databases, highlighting its significance in theoretical materials science. Understanding its structural configurations provides valuable insights into how cobalt and nickel interactions influence the performance of oxide catalysts in demanding environments.
Key Properties
Cross-validated computational properties for Co4NiO8, aggregated across 4 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for Co4NiO8, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| P-1 (No. 2) | triclinic | 0.90 | 0.1196 | -6.723 | 5.20 |
| C2/m (No. 12) | monoclinic | 0.00 | 0.1433 | -6.699 | 5.28 |
| — | — | — | — | — | 4.95 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.28 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.55 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.42 |
| C2/m (No. 12) | — | — | — | — | — |
Applications
Where Co4NiO8 is used.
Frequently Asked Questions
Common questions about Co4NiO8, answered from cross-validated data.
What is Co4NiO8?
Co4NiO8 is a semiconducting complex oxide being studied for its potential utility as a catalyst in oxygen-evolution reactions.
What is Co4NiO8 used for?
What is the band gap of Co4NiO8?
Is Co4NiO8 a metal, semiconductor, or insulator?
Is Co4NiO8 thermodynamically stable?
What is the crystal structure of Co4NiO8?
What is the density of Co4NiO8?
How many polymorphs of Co4NiO8 are known?
What elements does Co4NiO8 contain?
Where does the data for Co4NiO8 come from?
How It Compares
Within the oxide oxygen-evolution catalysts class.
Within the diverse family of oxide oxygen-evolution catalysts, Co4NiO8 is distinguished by its complex stoichiometry compared to simpler binary oxides like NiO. While materials such as LiCoO2 and LaNiO3 are well-established, stable frameworks for battery and catalytic applications, Co4NiO8 represents a more exotic, metastable composition that challenges conventional synthesis routes and offers a unique structural landscape for researchers to explore.
Related Compounds
Other Oxide Oxygen-Evolution Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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