scholarly journals Evaluation of sputtered nickel oxide, cobalt oxide and nickel–cobalt oxide on n-type silicon photoanodes for solar-driven O2(g) evolution from water

2020 ◽  
Vol 8 (28) ◽  
pp. 13955-13963 ◽  
Author(s):  
Fan Yang ◽  
Xinghao Zhou ◽  
Noah T. Plymale ◽  
Ke Sun ◽  
Nathan S. Lewis
Keyword(s):  
Thin Films ◽  
Nickel Oxide ◽  
Cobalt Oxide ◽  
Water Oxidation ◽  
Type Silicon ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

Thin films of nickel oxide (NiOx), cobalt oxide (CoOx) and nickel–cobalt oxide (NiCoOx) produced integrated, protected Si (111) photoanodes integrated, protected Si photoanodes that did not require deposition of a separate heterogeneous electrocatalyst for water oxidation.

scholarly journals Effect of Co Doping on Structural and Optical Properties of NiO Thin Films Prepared by Chemical Spray Pyrolysis Method

2014 ◽  
Vol 41 ◽  
pp. 15-30 ◽  
Author(s):  
Nabeel A. Bakr ◽  
Sabah A. Salman ◽  
Ahmed M. Shano
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Crystallite Size ◽  
Cobalt Oxide ◽  
Chemical Spray Pyrolysis ◽  
Structural And Optical Properties ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide ◽  
Chemical Spray ◽  
Co Concentration

In this work, nickel-cobalt oxide (Ni(1-x)CoxO) thin films, where x = 0, 4, 6 and 8 % have been successfully deposited on glass substrates by chemical spray pyrolysis (CSP) technique at substrate temperature of (400 °C) and thickness of about 300 nm. The structural and optical properties of these films have been studied using XRD, AFM, and UV-Visible spectroscopy. The XRD results showed that all films are polycrystalline in nature with cubic structure and preferred orientation along (111) plane. The crystallite size was calculated using Scherrer formula and it is found that the undoped NiO sample has maximum crystallite size (51.16 nm). AFM results showed homogenous and smooth thin films. The absorbance and transmittance spectra have been recorded in the wavelength range of (300-900) nm in order to study the optical properties. The optical energy gap for allowed direct electronic transition was calculated using Tauc equation. It is found that the band gap decreases as the Co-concentration increases and the band gap values were in the range of 3.58-3.66 eV and 3.58 eV for the prepared Nickel-Cobalt Oxide thin films. The Urbach energy increases as the Co-concentration increases and the Urbach. The optical constants including (absorption coefficient, real and imaginary parts of dielectric constant) were also calculated as a function of photon energy. Refractive index and extinction coefficient for Nickel-Cobalt Oxide thin films were estimated as a function of wavelength.

scholarly journals Nickel-Cobalt Oxide Thin-Films Anodes for Lithium-ion Batteries

2020 ◽  
Author(s):  
Ilya Mitrofanov ◽  
Denis Nazarov ◽  
Yury Koshtyal ◽  
Ilya Ezhov ◽  
Pavel Fedorov ◽  
...  
Keyword(s):  
Thin Films ◽  
Lithium Ion Batteries ◽  
Cobalt Oxide ◽  
Lithium Ion ◽  
Oxide Thin Films ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

Local degradation pathways in lithium-rich manganese–nickel–cobalt oxide epitaxial thin films

2017 ◽  
Vol 53 (2) ◽  
pp. 1365-1379 ◽  
Author(s):  
Aaron C. Johnston-Peck ◽  
Saya Takeuchi ◽  
K. Kamala Bharathi ◽  
Andrew. A. Herzing ◽  
Leonid A. Bendersky
Keyword(s):  
Thin Films ◽  
Cobalt Oxide ◽  
Degradation Pathways ◽  
Epitaxial Thin Films ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

Aerosol-assisted nanostructuring of nickel/cobalt oxide thin films for viable electrochemical hydrazine sensing

The Analyst ◽  
2021 ◽  
Author(s):  
Abdul Rehman ◽  
Muhammad Ali Ehsan ◽  
Adeel Afzal ◽  
Asghar Ali ◽  
Naseer Iqbal
Keyword(s):  
Thin Films ◽  
Chemical Vapor Deposition ◽  
Cobalt Oxide ◽  
Electrochemical Detection ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Oxide Thin Films ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

NiO–CoO-nanoparticle (NP) and NiO–CoO-nanowall (NW) films are fabricated by aerosol assisted chemical vapor deposition (AACVD) over FTO substrates for the electrochemical detection of hydrazine.

Domain formation in lithium-rich manganese-nickel-cobalt-oxide epitaxial thin films and implications for interpretation of electrochemical behavior

2018 ◽  
Vol 647 ◽  
pp. 40-49 ◽  
Author(s):  
Aaron C. Johnston-Peck ◽  
Saya Takeuchi ◽  
K. Kamala Bharathi ◽  
Andrew A. Herzing ◽  
Leonid A. Bendersky
Keyword(s):  
Thin Films ◽  
Cobalt Oxide ◽  
Electrochemical Behavior ◽  
Epitaxial Thin Films ◽  
Domain Formation ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

Functional properties of nickel cobalt oxide thin films

2011 ◽  
Vol 520 (1) ◽  
pp. 651-655 ◽  
Author(s):  
F. Iacomi ◽  
G. Calin ◽  
C. Scarlat ◽  
M. Irimia ◽  
C. Doroftei ◽  
...  
Keyword(s):  
Thin Films ◽  
Cobalt Oxide ◽  
Functional Properties ◽  
Oxide Thin Films ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

scholarly journals Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3918
Author(s):  
Anna Dymerska ◽  
Wojciech Kukułka ◽  
Marcin Biegun ◽  
Ewa Mijowska
Keyword(s):  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Active Sites ◽  
Solvothermal Reaction ◽  
Step Method ◽  
One Pot ◽  
Widespread Application ◽  
Nickel Cobalt ◽  
Slow Kinetics ◽  
Nickel Cobalt Oxide

The renewable energy technologies require electrocatalysts for reactions, such as the oxygen and/or hydrogen evolution reaction (OER/HER). They are complex electrochemical reactions that take place through the direct transfer of electrons. However, mostly they have high over-potentials and slow kinetics, that is why they require electrocatalysts to lower the over-potential of the reactions and enhance the reaction rate. The commercially used catalysts (e.g., ruthenium nanoparticles—Ru, iridium nanoparticles—Ir, and their oxides: RuO2, IrO2, platinum—Pt) contain metals that have poor stability, and are not economically worthwhile for widespread application. Here, we propose the spinel structure of nickel-cobalt oxide (NiCo2O4) fabricated to serve as electrocatalyst for OER. These structures were obtained by a facile two-step method: (1) One-pot solvothermal reaction and subsequently (2) pyrolysis or carbonization, respectively. This material exhibits novel rod-like morphology formed by tiny spheres. The presence of transition metal particles such as Co and Ni due to their conductivity and electron configurations provides a great number of active sites, which brings superior electrochemical performance in oxygen evolution and good stability in long-term tests. Therefore, it is believed that we propose interesting low-cost material that can act as a super stable catalyst in OER.

Sign in / Sign up

Export Citation Format

Share Document