Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction

Fu, Haihai; Liu, Yi; Chen, Long; Shi, Yulin; Kong, Wenwen; Hou, Juan; Ye, Feng; Wei, Tingting; Wang, Hao; Guo, Xuhong

doi:10.1016/j.electacta.2018.11.103

Cited by 101 publications

(50 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Through morphology controlling, NiCo 2 O 4 with larger surface area, porous and 3D hierarchical structure could be fabricated, which could provide more accessible active sites for ORR/OER. Some successful examples are nanowire [7], nano platelet [8], nanosphere [9,10], and 3D nanoshees [11,12]; (2) Metal doping. The electronic structure of spinel oxides is highly related to its composition, and the composition adjustment by a third metal doping is an effective strategy to improve the activity.…”

Section: Introductionmentioning

confidence: 99%

Flower-like NiCo2O4–CN as efficient bifunctional electrocatalyst for Zn-Air battery

Zhou

Cheng

et al. 2020

Electrochimica Acta

View full text Add to dashboard Cite

Bifunctional transition metal oxide based electrocatalysts play an important role in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for rechargeable metal-air batteries. Herein, we synthesize a kind of three-dimensional (3D) flower-like composite catalyst with NiCo 2 O 4 and N doped carbon (NC) derived from g-C 3 N 4 , under hydrothermal conditions. The best NiCo 2 O 4-CN catalyst shows a hierarchical structure composed of interconnected nanosheets, and exhibits versatile bifunctional ORR/OER electroactivities with a half-wave potential of 0.81 V for ORR and an overpotential of 383 mV for OER under a current density of 10 mA cm −2. The zinc-air battery with the NiCo 2 O 4-CN cathode demonstrates superior peak power density (149.6mW cm-2), excellent capacity performance up to 738.7 mAh g-1 and considerable durability, showing the feasibility of NiCo 2 O 4-CN in electrochemical energy devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Flower-like NiCo2O4–CN as efficient bifunctional electrocatalyst for Zn-Air battery

Zhou

Cheng

et al. 2020

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…With mixed solvent of methanol and water (1 : 1), the mixture of nanosheet and nanoplate is obtained as exhibited in Figure b. The 3D porous structure of these NiCo 2 O 4 materials endows them with better mass transport and electron transfer . The EDX and SEM‐mapping results are shown in Figure S1 (supplementary information), based on the result, we can see that the ratio of Ni to Co is close to 1 : 2, the C content is about 17(atomic)%, and Ni, Co, O, C is uniformly distributed.…”

Section: Resultsmentioning

confidence: 91%

Shape‐Controlled Synthesis of NiCo₂O₄‐rGO as Bifunctional Electrocatalyst for Zn‐Air Battery

Cheng

Zhou

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

The engineering of morphology and surface structure of electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is an effective strategy to improve their performance. Herein, we synthesized NiCo2O4 catalysts with different shape by controlling the reaction solvent and studied their morphology‐dependent ORR/OER activities by various characterizations and electrochemical measurements. The NiCo2O4 prepared using methanol as solvent displays three‐dimensional (3D) hierarchical structure composed of interconnected nanosheets, and exhibits the best ORR/OER performance (a half‐wave potential of 0.78 V for ORR and an overpotential of 381 mV for OER). When used as catalyst for a rechargeable Zn‐air battery, it possesses a peak power density of 125.3 mW cm−2 with relatively superior durability.

show abstract

“…As displayed in Figure 5a, the initial potential of DBD-FeCo@NC was 1.49 V vs. RHE, which was more negative than that of FeCo@NC (1.55 V vs. RHE), and the initial potential of nickel foam displayed 1.58 V vs. RHE, suggesting an enhanced OER activity in DBD-FeCo@NC. It is well known that the potential demanded to provide the current density of 10 mA/cm 2 is the key benchmark for OER [43,44,45]. Under the current density of 10.0 mA/cm 2 , overpotential of 386 mV and 335 mV were estimated for FeCo@NC and DBD-FeCo@NC, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effective Oxygen Reduction Reaction Performance of FeCo Alloys In Situ Anchored on Nitrogen-Doped Carbon by the Microwave-Assistant Carbon Bath Method and Subsequent Plasma Etching

Liu

et al. 2019

Nanomaterials

Self Cite

View full text Add to dashboard Cite

Electrocatalysts with strong stability and high electrocatalytic activity have received increasing interest for oxygen reduction reactions (ORRs) in the cathodes of energy storage and conversion devices, such as fuel cells and metal-air batteries. However, there are still several bottleneck problems concerning stability, efficiency, and cost, which prevent the development of ORR catalysts. Herein, we prepared bimetal FeCo alloy nanoparticles wrapped in Nitrogen (N)-doped graphitic carbon, using Co-Fe Prussian blue analogs (Co3[Fe(CN)6]2, Co-Fe PBA) by the microwave-assisted carbon bath method (MW-CBM) as a precursor, followed by dielectric barrier discharge (DBD) plasma treatment. This novel preparation strategy not only possessed a fast synthesis rate by MW-CBM, but also caused an increase in defect sites by DBD plasma treatment. It is believed that the co-existence of Fe/Co-N sites, rich active sites, core-shell structure, and FeCo alloys could jointly enhance the catalytic activity of ORRs. The obtained catalyst exhibited a positive half-wave potential of 0.88 V vs. reversible hydrogen electrode (RHE) and an onset potential of 0.95 V vs. RHE for ORRs. The catalyst showed a higher selectivity and long-term stability than Pt/C towards ORR in alkaline media.

show abstract

Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction

Cited by 101 publications

References 51 publications

Flower-like NiCo2O4–CN as efficient bifunctional electrocatalyst for Zn-Air battery

Flower-like NiCo2O4–CN as efficient bifunctional electrocatalyst for Zn-Air battery

Shape‐Controlled Synthesis of NiCo₂O₄‐rGO as Bifunctional Electrocatalyst for Zn‐Air Battery

Effective Oxygen Reduction Reaction Performance of FeCo Alloys In Situ Anchored on Nitrogen-Doped Carbon by the Microwave-Assistant Carbon Bath Method and Subsequent Plasma Etching

Contact Info

Product

Resources

About

Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction

Cited by 101 publications

References 51 publications

Flower-like NiCo2O4–CN as efficient bifunctional electrocatalyst for Zn-Air battery

Flower-like NiCo2O4–CN as efficient bifunctional electrocatalyst for Zn-Air battery

Shape‐Controlled Synthesis of NiCo2O4‐rGO as Bifunctional Electrocatalyst for Zn‐Air Battery

Effective Oxygen Reduction Reaction Performance of FeCo Alloys In Situ Anchored on Nitrogen-Doped Carbon by the Microwave-Assistant Carbon Bath Method and Subsequent Plasma Etching

Contact Info

Product

Resources

About

Shape‐Controlled Synthesis of NiCo₂O₄‐rGO as Bifunctional Electrocatalyst for Zn‐Air Battery