Cobalt thin films as water-recombination electrocatalysts

Linder, Clara; Rao, Smita G.; Febvrier, Arnaud Le; Greczyński, Grzegorz; Sjövall, Rune; Munktell, Sara; Eklund, Per; Björk, Emma M.

doi:10.1016/j.surfcoat.2020.126643

Cited by 12 publications

(7 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, to the anodization step, CoCrFe 0.7 Ni and CoCrFe 0.5 Ni had the highest current densities. The catalytic activity in the films is attributed to the Co 3+ and Ni 3+ active sites in the anodized surfaces as it has been reported in other studies ,,, and also in our study about Co thin films but also to the synergy effect with Fe additions. Higher catalytic activity toward OER and ORR when Fe is introduced in excess in FeNi 3 /NC nanoparticles has been reported by Chen et al Nevertheless, the high performance of the films was hypothesized to be due to the lattice distortion caused by the addition of Fe, which increases the surface area and the density of active sites.…”

Section: Discussionsupporting

confidence: 89%

“…Co and Ni oxides can be active catalysts for water recombination, in particular, toward ORR in alkaline electrolytes. , For this purpose, the surface state of the films was assessed by CV in 1 M KOH (Figure a), followed by anodization to modify the films and create active oxide sites for catalysis (Figure b,c) and evaluation of the catalytic activity of the activated films by CV in O 2 -saturated 1 M KOH (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…The kinetically limiting reaction in water recombination is the oxygen reduction reaction (ORR), which requires an electrocatalyst. Cobalt oxides as nanoparticles have been reported to be efficient toward ORR, , and we have previously demonstrated that Co thin films can be used as electrocatalysts . Other alternatives with high efficiency for ORR are Ni/NiO and NiCo 2 O 4 spinels …”

Section: Introductionmentioning

confidence: 99%

“…Cobalt oxides as nanoparticles have been reported to be efficient toward ORR, 23,24 and we have previously demonstrated that Co thin films can be used as electrocatalysts. 25 Other alternatives with high efficiency for ORR are Ni/NiO 26 and NiCo 2 O 4 spinels. 27 The structural and mechanical properties of CoCrFeNi thin films deposited by magnetron sputtering have been studied by various research groups 28−32 but neither their corrosion properties nor their catalytic activity toward ORR has been investigated.…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

Linder

Rao

Boyd

et al. 2022

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

Corrosion resistance and catalytic activity toward the oxygen reduction reaction (ORR) in an alkaline environment are two key properties for water recombination applications. In this work, CoCrFe x Ni (0 ≤ x ≤ 0.7) thin films were deposited by magnetron sputtering on polished steel substrates. The native passive layer was 2–4 nm thick and coherent to the columnar grains determined by transmission electron microscopy. The effect of Fe on the corrosion properties in 0.1 M NaCl and 1 M KOH and the catalytic activity of the films toward ORR were investigated. Electrochemical impedance spectroscopy and potentiodynamic polarization measurements indicate that CoCrFe0.7Ni and CoCrFe0.3Ni have the highest corrosion resistance of the studied films in NaCl and KOH, respectively. The high corrosion resistance of the CoCrFe0.7Ni film in NaCl was attributed to the smaller overall grain size, which leads to a more homogeneous film with a stronger passive layer. For CoCrFe0.3Ni in KOH, it was attributed to a lower Fe dissolution into the electrolyte and the build-up of a thick and protective hydroxide layer. Scanning Kelvin probe force microscopy showed no potential differences globally in any of the films, but locally, a potential gradient between the top of the columns and grain boundaries was observed. Corrosion of the films was likely initiated at the top of the columns where the potential was lowest. It was concluded that Fe is essential for the electrochemical activation of the surfaces and the catalytic activity toward ORR in an alkaline medium. The highest catalytic activity was recorded for high Fe-content films (x ≥ 0.5) and was attributed to the formation of platelet-like oxide particles on the film surface upon anodization. The study showed that the combination of corrosion resistance and catalytic activity toward ORR is possible for CoCrFe x Ni, making this material system a suitable candidate for water recombination in an alkaline environment.

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

Linder

Rao

Boyd

et al. 2022

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…So that, researchers are developing electrocatalysts for OER with low overpotential, ease of synthesis and low-cost. In this fact, various transition metal oxides, sulfides, selenides, and phosphide based electrocatalysts were developed to overcome such problems [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

MnO2@Co3O4 nanocomposite based electrocatalyst for effective oxygen evolution reaction

Solangi

Hanan

Laghari

et al. 2022

SJET

View full text Add to dashboard Cite

For large-scale energy applications, conceiving low-cost and simple earth-abundant electrocatalysts are more difficult. By using an aqueous chemical technique, MnO2 was added into Co3O4 with varying concentrations to prepare MnO2@Co3O4 nanocomposite (CM). In an aqueous solution of 1 M KOH, the electrocatalyst with a greater concentration of MnO2 outperforms in terms of OER. To confirm the composition, crystalline structure, and morphology of the electrocatalyst, analytical methods such as X-ray diffraction (XRD) techniques, Fourier transformed infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used. At 20 mA/cm2 current density, the electrocatalyst had a lowest overpotential of 310 mV verses Reversible hydrogen electrode (RHE). The CM-0.4 electrocatalyst has a small Tafel slope value and charge transfer resistance of approximately 72 mV/dec and 74 Ω which confirm its high catalytic activity. The electrocatalyst reveals a double layer capacitance (Rct) of 18 µF/cm2 and an electrochemical active surface area (ECSA) of 450 cm2, demonstrating that addition of MnO2 impurities into Co3O4 enhances the active catalyst sites. These findings contribute to the knowledge of these kind of catalysts, that will assist in the development of novel electrocatalysts which are feasible for prospective energy generation technologies.

show abstract

Synthesis and DFT studies of robust heterogeneous Co(III) catalyst for liquid phase oxidation of tetralin

Tiwari,

Khare

2024

Res Chem Intermed

View full text Add to dashboard Cite

Cobalt thin films as water-recombination electrocatalysts

Cited by 12 publications

References 35 publications

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

MnO2@Co3O4 nanocomposite based electrocatalyst for effective oxygen evolution reaction

Synthesis and DFT studies of robust heterogeneous Co(III) catalyst for liquid phase oxidation of tetralin

Contact Info

Product

Resources

About

Cobalt thin films as water-recombination electrocatalysts

Cited by 12 publications

References 35 publications

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFexNi (0 ≤ x ≤ 0.7) Thin Films

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFexNi (0 ≤ x ≤ 0.7) Thin Films

MnO2@Co3O4 nanocomposite based electrocatalyst for effective oxygen evolution reaction

Synthesis and DFT studies of robust heterogeneous Co(III) catalyst for liquid phase oxidation of tetralin

Contact Info

Product

Resources

About

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films

Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFe_xNi (0 ≤ x ≤ 0.7) Thin Films