NiCO2
NiCO2 is a metastable, insulating oxide material studied for its potential applications in oxygen-evolution catalysis.
About NiCO2
NiCO2 is a metastable oxide compound that functions within the class of oxygen-evolution catalysts. As a wide-band-gap insulator, it presents a unique electronic profile that distinguishes it from more conductive metallic oxides typically utilized in catalytic applications.
Its structural complexity is highlighted by a significant number of reported configurations, indicating a rich landscape for materials research. This compound is primarily investigated for its potential role in electrochemical processes where specific surface interactions and stability are critical for catalytic performance.
Key Properties
Cross-validated computational properties for NiCO2, aggregated across 3 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 NiCO2, 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. |
|---|---|---|---|---|---|
| P21/c (No. 14) | monoclinic | 3.24 | 0.0764 | -7.775 | 4.18 |
| Pmma (No. 51) | Orthorhombic | — | — | — | 3.73 |
| No. 0 | unknown | — | — | — | 2.43 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.78 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.66 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.46 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.21 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.45 |
| Cmmm (No. 65) | Orthorhombic | — | — | — | 4.57 |
| P2/m (No. 10) | Monoclinic | — | — | — | 3.94 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.90 |
| P21/m (No. 11) | Monoclinic | — | — | — | 4.74 |
Applications
Where NiCO2 is used.
Frequently Asked Questions
Common questions about NiCO2, answered from cross-validated data.
What is NiCO2?
NiCO2 is a metastable, insulating oxide material studied for its potential applications in oxygen-evolution catalysis.
What is NiCO2 used for?
What is the band gap of NiCO2?
Is NiCO2 a metal, semiconductor, or insulator?
Is NiCO2 thermodynamically stable?
What is the crystal structure of NiCO2?
What is the density of NiCO2?
How many polymorphs of NiCO2 are known?
What elements does NiCO2 contain?
Where does the data for NiCO2 come from?
How It Compares
Within the oxide oxygen-evolution catalysts class.
Within the broader family of oxygen-evolution catalysts, NiCO2 occupies a distinct niche compared to well-characterized materials like NiO or LiCoO2. While many of its siblings, such as LaNiO3 or LiMn2O4, are known for their metallic or semi-metallic behavior and high conductivity, NiCO2 remains an insulating phase, making it a specialized subject for studies focusing on the impact of electronic structure on catalytic activity.
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).
- mpaloe — Data from mpaloe.
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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