Co5O8

ceramic

· JVASP-47502· Co5O8

Co₅O₈ is a mixed-valence cobalt oxide ceramic compound that exists as part of the cobalt oxide family, where cobalt exists in both +2 and +3 oxidation states. This material is primarily investigated in research and development contexts for electrochemical and catalytic applications rather than as an established engineering commodity. Its notable applications include energy storage devices (supercapacitors, battery electrodes), oxygen evolution catalysis for water splitting and fuel cells, and magnetic oxide systems—areas where its electrical conductivity and redox activity offer advantages over simpler cobalt oxide phases like CoO or Co₃O₄.

supercapacitor electrodesbattery materials (emerging)electrocatalysis for fuel cellswater splitting catalystsmagnetic oxide systemsresearch/development phase

Compliance & Regulations

?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions	Source
Density(ρ)	0.1965	lb/in³	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

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Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)	0.000	eV	DFT · OptB88vdW
Dielectric Constant (Relative Permittivity)(εr)	420.7	-	DFT · OptB88vdW
Magnetic Moment(μB)	4.694	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.2737	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000455	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000442	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	37.57	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	36.94	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Property	Value	Unit	Conditions	Source
Energy Above Hull(ΔEhull)	0.000	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)	-1.131	eV/atom	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

Regulatory Screening

Environmental

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.

Co5O8 — Properties & Data | MatWorld

Co5O8

Physical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental