Two-step oxygen reduction on spinel NiFe2O4 catalyst: Rechargeable, aqueous solution- and gel-based, Zn-air batteries

Naik, Keerti M.; Sampath, S.

doi:10.1016/j.electacta.2018.08.138

Cited by 73 publications

(30 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amounts of H 2 O 2 for Co/N/C‐900 indicated that Co/N/C‐900 had a 2×2 e − transfer pathway in taking part in ORR process. The relationship between amounts of H 2 O 2 and ORR transfer pathway was consistent with the previous Ni‐based and Mn‐based catalyst . RDE and RRDE measurements suggested Co/N/C‐900 had a remarkable electrochemical performance may be ascribed to the large EAA and introduction of an amount of pyridinic−N in the composites that improved the 2×2 e − transfer pathway.…”

Section: Resultssupporting

confidence: 86%

Cobalt‐based Catalysts Modified Cathode for Enhancing Bioelectricity Generation and Wastewater Treatment in Air‐breathing Cathode Microbial Fuel Cells

Zhong

Zhang

et al. 2019

Electroanalysis

View full text Add to dashboard Cite

To seek an efficient way to enhance the power output and wastewater treatment of microbial fuel cell (MFC), several cobalt‐based composites are successfully synthesized by a facile hydrothermal method under different pyrolysis temperature, and these composites are used as electrocatalyst in air‐breathing cathode of MFC. Different species of nitrogen atom are successfully grafted on the cobalt‐based composites and confirmed by physical and electrochemical analyses. In MFC tests, the maximum power density increases from 577.8 mW m−2 to 931.1 mW m−2 with pyrolysis temperature (except for 1000 °C). These electrochemical tests and high COD removal show that Co/N/C‐900 can rapidly transfer electron via a 2×2 e− transfer pathway, mainly due to the exposure of large electrochemical active area and introduction of the defects of pyridinic−N and abundant oxygen vacancies. Although the power density of MFC with Co/N/C‐900 is 81.1 % of that of commercial Pt/C, the MFC with Co/N/C‐900 is more stable than that of Pt/C, and the power density for Co/N/C‐900 has only a 2.8 % decrease during 25‐cycles operation. The great electrocatalytic activity of the novel Co/N/C‐900 composite exhibits a superior outlook for scale‐up application of MFC in the future.

show abstract

Section: Resultssupporting

confidence: 86%

Cobalt‐based Catalysts Modified Cathode for Enhancing Bioelectricity Generation and Wastewater Treatment in Air‐breathing Cathode Microbial Fuel Cells

Zhong

Zhang

et al. 2019

Electroanalysis

View full text Add to dashboard Cite

show abstract

“…The NiCo−Phi/CNT sample shows higher ORR onset potential with higher current density compared to NiCo−Phi indicative of higher efficiency of NiCo−Phi/CNT sample towards ORR. The observation of two reduction peaks at 0.6 V and 0.1 V in LSV reveals that the reduction probably proceeds through a two‐electron pathway with H 2 O 2 as reactive intermediate, similar to that reported in the case of NiFeO 4 . To further study the ORR activity of electrocatalyst, the Tafel slope of NiCo−Phi and NiCo−Phi/CNT are estimated and the values are 114 and 100 mV/dec, respectively (Figure (d)).…”

Section: Resultssupporting

confidence: 75%

Nickel Cobalt Phosphite Nanorods Decorated with Carbon Nanotubes as Bifunctional Electrocatalysts in Alkaline Medium with a High Yield of Hydrogen Peroxide

2020

View full text Add to dashboard Cite

It is highly desirable to develop an energy generation system comprising a low-cost and earth-abundant non-noble metal catalyst for bifunctional electrocatalysis with good overall process performance, especially for applications in fuel cells or metal-air batteries. In this report, we show that nickel cobalt phosphite (NiCoÀ Phi) decorated with carbon nanotubes (CNTs) can perform as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions (OER and ORR, respectively). The NiCoÀ Phi/CNT composite is synthesized by employing a simple, single-step hydrothermal method. The morphology of the composite consists of nanorod bundles of NiCoÀ Phi decorated with CNTs. The synthesized NiCoÀ Phi/CNT composite exhibits enhanced electrochemical OER activity with an overpotential of 400 mV at a current density of 10 mA/cm 2 and a Tafel slope value of 117 mV dec À 1 in 1 M KOH, possessing high stability towards the OER for 20 h. The ORR using the same catalyst shows an onset potential of 0.75 V and a Tafel slope of 100 mV dec À 1 in 0.1 M KOH with high-yield production of H 2 O 2 (85 %). The predominant formation of H 2 O 2 occurs mainly through a two-electron transfer process, as established by mass-controlled kinetic studies and has not been observed previously in these phosphorous oxy anion-based materials. The superior bifunctional nature of NiCoÀ Phi/CNT towards the OER and ORR arises from the synergistic effect of doped metal phosphites and CNTs.

show abstract

“…Because they possess very high durability and fewer operational safety 4 issues, Zn–air batteries have attracted more attention regarding their use in a wide spectrum of energy conversion systems than, e.g., Li–air batteries have. The operational environment for Zn–air batteries is a neutral electrolyte or aqueous alkaline, increasing their environmental safety 1 , 5 , 6 . Platinum-based electrocatalysts are widely used due to their relatively low overvoltage and high current density 5 , 7 , 8 ; however, they have their disadvantages, such as no resistance to intermediates, slow kinetics, and instability with prolonged use 9 .…”

Section: Introductionmentioning

confidence: 99%

Green algae and gelatine derived nitrogen rich carbon as an outstanding competitor to Pt loaded carbon catalysts

Ilnicka

Skorupska

Tyc

et al. 2021

Sci Rep

View full text Add to dashboard Cite

The development of effective catalysts for the oxygen reduction reaction (ORR) is a significant challenge in energy conversion systems, e.g., Zn–air batteries. Herein, green-algae- and gelatine-derived porous, nitrogen-rich carbons were extensively investigated as electrode materials for electrochemical catalytic reactions. These carbon-based catalysts were designed and optimized to create a metal-free catalyst via templating, carbonization, and subsequent removal of the template. The additional incorporation of graphene improved electronic conductivity and enhanced the electrochemical catalytic reaction. Porous carbons with heteroatoms were used as effective platinum-free ORR electrocatalysts for energy conversion; the presence of nitrogen in the carbon provided more active sites for ORR. Our catalyst also displayed notable durability in a rechargeable Zn–air battery energy system. More importantly, the nitrogen-containing porous carbons were found to have comparable ORR performance in alkaline media to commercially available electrocatalysts. The manuscript demonstrates that nitrogen atom insertion is an appropriate approach when aiming to eliminate noble metals from the synthesis route. N-doped carbons are competitive materials compared to reference platinum-based catalysts.

show abstract

Two-step oxygen reduction on spinel NiFe2O4 catalyst: Rechargeable, aqueous solution- and gel-based, Zn-air batteries

Cited by 73 publications

References 60 publications

Cobalt‐based Catalysts Modified Cathode for Enhancing Bioelectricity Generation and Wastewater Treatment in Air‐breathing Cathode Microbial Fuel Cells

Cobalt‐based Catalysts Modified Cathode for Enhancing Bioelectricity Generation and Wastewater Treatment in Air‐breathing Cathode Microbial Fuel Cells

Nickel Cobalt Phosphite Nanorods Decorated with Carbon Nanotubes as Bifunctional Electrocatalysts in Alkaline Medium with a High Yield of Hydrogen Peroxide

Green algae and gelatine derived nitrogen rich carbon as an outstanding competitor to Pt loaded carbon catalysts

Contact Info

Product

Resources

About