skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structure and Reactivity of Pristine and Reduced Spinel CoFe2O4 (001)/(100) Surfaces

Journal Article · · Journal of Physical Chemistry. C

Cobalt ferrite, CoFe2O4 (CFO), nanocrystals are efficient and competitive anode materials in the field of electrochemical water splitting. Using density functional theory with on-site Hubbard U corrections (DFT+U), we have investigated the structural, electronic and magnetic properties of CFO (001)/(100) surfaces, as well as their reactivities towards water adsorption. Special attention has been focused on the formation of oxygen vacancies (VO), due to their key role in the oxidation activity of metal oxides, often based on the Mars-van-Krevelen mechanism. Our results show that vacancy formation is easiest at oxygen sites that are not bound to tetrahedrally-coordinated Fe. Water adsorbs mainly in molecular form on the Co/Fe metal cations, whereas it dissociates at defects. In comparison to other spinels, CFO is similar to NiFe2O4, exhibiting relatively low energy cost of VO formation and a strong affinity of the vacancies towards water. Furthermore, these findings suggest that CFO may be a more promising oxidation catalyst than NiCo2O4 and Co3O4.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0007347
OSTI ID:
1838126
Journal Information:
Journal of Physical Chemistry. C, Vol. 125, Issue 18; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (33)

Confinement-induced metal-to-insulator transition in strained LaNiO 3 /LaAlO 3 superlattices journal November 2011
Oxygen Deficiency and Reactivity of Spinel NiCo 2 O 4 (001) Surfaces journal February 2017
High Temperature Water Gas Shift Reaction over Nanocrystalline Copper Codoped-Modified Ferrites journal March 2011
Magnetic Properties and Mössbauer Spectroscopy of Fe 3 O 4 /CoFe 2 O 4 Nanorods journal February 2020
Generalized Gradient Approximation Made Simple journal October 1996
Tuning of optical bandgap and magnetization of CoFe 2 O 4 thin films journal July 2014
Unravelling the Role of Metallic Cu in Cu-CuFe 2 O 4 /C Nanohybrid for Enhanced Oxygen Reduction Electrocatalysis journal March 2020
Surface Termination and Composition Control of Activity of the Co x Ni 1– x Fe 2 O 4 (001) Surface for Water Oxidation: Insights from DFT+ U Calculations journal October 2018
Probing optical band gaps at the nanoscale in NiFe 2 O 4 and CoFe 2 O 4 epitaxial films by high resolution electron energy loss spectroscopy journal September 2014
Formation, Electronic Structure, and Defects of Ni Substituted Spinel Cobalt Oxide: a DFT+U Study journal June 2016
The Role of Composition of Uniform and Highly Dispersed Cobalt Vanadium Iron Spinel Nanocrystals for Oxygen Electrocatalysis journal January 2018
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond journal July 2017
N2O catalytic decomposition over various spinel-type oxides journal January 2007
Tailoring Morphology and Electronic Structure of Cobalt Iron Oxide Nanowires for Electrochemical Oxygen Evolution Reaction journal August 2020
Thermodynamic Stability, Redox Properties, and Reactivity of Mn 3 O 4 , Fe 3 O 4 , and Co 3 O 4 Model Catalysts for N 2 O Decomposition: Resolving the Origins of Steady Turnover journal January 2016
2D Nanostructures of CoFe2O4 and NiFe2O4: Efficient Oxygen Evolution Catalyst journal May 2018
Role of Composition and Size of Cobalt Ferrite Nanocrystals in the Oxygen Evolution Reaction journal June 2017
Selective 2-Propanol Oxidation over Unsupported Co 3 O 4 Spinel Nanoparticles: Mechanistic Insights into Aerobic Oxidation of Alcohols journal May 2019
Soft self-consistent pseudopotentials in a generalized eigenvalue formalism journal April 1990
Single-crystal elastic constants of Co-Al and Co-Fe spinels journal May 1991
Mechanism and activity of CO oxidation on (001) and (110) surfaces of spinel Co3O4, NiCo2O4 and NiFe2O4: A DFT + U study journal November 2018
DFT+U Study of the Surface Structure and Stability of Co 3 O 4 (110): Dependence on U journal April 2015
On the reversible deactivation of cobalt ferrite spinel nanoparticles applied in selective 2-propanol oxidation journal February 2020
In Situ Characterization of CuFe 2 O 4 and Cu/Fe 3 O 4 Water−Gas Shift Catalysts journal July 2009
Structural, electronic and magnetic properties of partially inverse spinel CoFe 2 O 4 : a first-principles study journal October 2010
In situ studies of surface of NiFe2O4 catalyst during complete oxidation of methane journal June 2016
Controlling the electronic structure of Co 1 x Fe 2 + x O 4 thin films through iron doping journal January 2011
Composition, structure, and stability of RuO 2 ( 110 ) as a function of oxygen pressure journal December 2001
Split-vacancy defect complexes of oxygen in hcp and fcc cobalt journal October 2020
Intrinsic Activity of Oxygen Evolution Catalysts Probed at Single CoFe 2 O 4 Nanoparticles journal May 2019
Simple, Unambiguous Theoretical Approach to Oxidation State Determination via First-Principles Calculations journal October 2011
Structure of the NiFe2O4(001) surface in contact with gaseous O2 and water vapor journal October 2015

Similar Records

Oxygen Deficiency and Reactivity of Spinel NiCo2O4 (001) Surfaces
Journal Article · Thu Feb 09 00:00:00 EST 2017 · Journal of Physical Chemistry. C · OSTI ID:1838126

In-situ structure and catalytic mechanism of NiFe and CoFe layered double hydroxides during oxygen evolution
Journal Article · Wed May 20 00:00:00 EDT 2020 · Nature Communications · OSTI ID:1838126

Enhanced Magnetization in CoFe2O4 Through Hydrogen Doping
Journal Article · Fri Feb 10 00:00:00 EST 2023 · Advanced Functional Materials · OSTI ID:1838126