Hierarchical interpenetrating rHGO-decorated NiCo2O4 nanowires architectures for high-performance supercapacitors

Li, Sumin; Yang, Kang; Ye, Pingwei; Jiang, Hui; Zhang, Zhao; Huang, Qiang; Wang, Lingyun

doi:10.1016/j.apsusc.2018.12.160

Cited by 50 publications

(12 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the binding energies of Ni 2p 3/2 and Co 2p 3/2 in NiCo 2 O 4 @FeNi LDH moved to higher values when FeNi LDH was electrodeposited. Thus, the chemical valence values of Ni and Co in NiCo 2 O 4 increased after integration with FeNi LDH. , These findings demonstrate the presence of intimate electronic interactions between the NiCo 2 O 4 and FeNi LDH at the interface, thus facilitating rapid charge transfer between FeNi LDH and NiCo 2 O 4 . , …”

Section: Resultsmentioning

confidence: 63%

“…For example, the Fe 2p 3/2 peak in Figure 4d, shifted toward lower binding energy when the electrodeposition time was less than 4 min and moved toward higher binding energy for an electrodeposition time of 5 min. In the case of Ni 2p 3/2 and 30,38 These findings demonstrate the presence of intimate electronic interactions between the NiCo 2 O 4 and FeNi LDH at the interface, thus facilitating rapid charge transfer between FeNi LDH and NiCo 2 O 4 . 39,40 Performance of Air Electrodes for ORR and OER.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

“…As shown in Figure a,b, many nanocone morphological NiCo 2 O 4 nanoarrays were uniformly grown on the commercially available Ni foam. The nanocone arrays had distinctive gaps that formed a porous three-dimensional spatial structure that promoted the absorption of alkaline liquid and release of gas bubbles. , Figures c and S1 show that the NiCo 2 O 4 nanocones had an average diameter of 158.8 nm. After the fast electrodeposition, core–shell nanoarray structures were observed in Figure d.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Controlled Synthesis of Bifunctional NiCo₂O₄@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Wan

Zhao

Chen

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

To boost the practical applications of rechargeable Zn−air batteries (ZABs), there is a need to design and synthesize bifunctional air electrodes with high catalytic activity and low cost used in self-supported electrodes. Herein, NiCo 2 O 4 nanocones@ FeNi layered double-hydroxide (LDH) nanosheets with a core− shell hierarchical architecture are prepared by a facile hydrothermal approach and fast electrochemical deposition. The NiCo 2 O 4 nanocones act as scaffolds that provide more reaction sites and accelerate charge transfer to the FeNi LDH nanosheets. Specifically, the modification of the FeNi LDHs at the surface of NiCo 2 O 4 nanocones modulates the chemical valences of Ni, Fe, and Co species and is controlled by the electrodeposition time, finally achieving the optimal bifunctional electrocatalytic activity. Primary ZABs manufactured by NiCo 2 O 4 @FeNi LDH have a peak power density (130 mW cm −2 ), open-circuit potential (OCV) (1.40 V), and great discharge stability. The rechargeable ZABs assembled with this bifunctional air electrode have a narrow discharge/charge gap of 0.65 V, high energy efficiency of 65.7% at 10 mA cm −2 , and operate stably for >80 h.

show abstract

Section: Resultsmentioning

confidence: 63%

Section: ■ Results and Discussionmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Controlled Synthesis of Bifunctional NiCo₂O₄@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Wan

Zhao

Chen

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…15,16 Figure 4b shows the charge/discharge features of the 5Fe,N-TiO 2 /C electrode, revealing a series of sloping voltage curves, which is the typical characteristic of pseudocapacitance. 10,34 In contrast, TiO 2 /C presents visible voltage platforms between 0.5 and 1.0 V (Figure 4c), suggesting its different reaction mechanisms. The initial Coulombic efficiency of 5Fe,N-TiO 2 /C is increased to 51% in comparison with 33% of TiO 2 /C, which is attributed to the low pore volume and surface area of 5Fe,N-TiO 2 /C, which restrain the amount of the SEI layer.…”

Section: Resultsmentioning

confidence: 98%

Amorphous TiO₂/C Frameworks as Intercalation Pseudocapacitance Anodes for Fast and Durable Sodium Storage

Wang

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

High rate and long-life sodium-ion batteries (SIBs) are highly desirable for stationary energy storage applications. However, the practical implementations of SIBs are strictly restricted due to the shortage of satisfactory anode materials. In this study, a Fe and N co-doped amorphous TiO 2 /C composite synthesized by an MOF-derived approach fulfills the demands of kinetics and durability by stimulating intercalation pseudocapacitance. Unlike traditional crystalline materials whose pseudocapacitance behaviors are highly dependent on the surface area and the crystal structure, the amorphous TiO 2 /C composite shows fast Na + intercalation/deintercalation independent of the surface area, and it can deliver impressive capacities, decent rate capability, and excellent cyclability. The electrochemical analysis shows that intercalation pseudocapacitance is responsible for the prominent sodium storage performance of the amorphous TiO 2 /C composite. This work demonstrates that Na + intercalation can be realized in amorphous structures and is beneficial for the development of extrinsic pseudocapacitive materials.

show abstract

“…Therefore, the development of polymetallic oxide supercapacitor materials with special micro-nano structure and morphology is of great practical significance and challenge. Thus far, various NiCo2O4 materials with different morphologies and nanostructures, such as nanowires [19], nanorods [20], urchin-like hollow microspheres [21], nanotubes [22], nanoneedles [23], nanosheets [24], etc., have been synthesized by various methods, including the sol-gel method [25], coprecipitation method [26], electrodeposition method [27], microwave method [28], and hydrothermal method [29]. In recent years, the ultracapacitors of NiCo2O4 have been studied [17,30].…”

Section: Introductionmentioning

confidence: 99%

Sol-gel synthesis and electrochemical performance of NiCo2O4 nanoparticles for supercapacitor applications

Zhang

Gao

et al. 2019

J. Electrochem. Sci. Eng.

View full text Add to dashboard Cite

In this work, NiCo2O4 nanoparticles with enhanced supercapacitive performance have been successfully synthesized via a facile sol-gel method and subsequent calcination in air. The morphology and composition of as-prepared samples were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and Raman spectroscopy (Raman). The electrochemical performances of NiCo2O4 nanoparticles as supercapacitor electrode materials were evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) tests in 3 mol L-1 KOH aqueous solution. The results show that as-prepared NiCo2O4 nanoparticles have diameters of about 20-30 nm with uniform distribution. There are some interspaces between nanoparticles observed, which could increase the effective contact area with the electrolyte and provide fast path for the insertion and extraction of electrolyte ions. The electrochemical tests show that the prepared NiCo2O4 nanoparticles for supercapacitors exhibit excellent electrochemical performance with high specific capacitance and good cycle stability. The specific capacitance of NiCo2O4 electrode has been found as high as 1080, 800, 651, and 574 F g-1 at current densities of 1, 4, 7, and 10 A g-1, respectively. Notably, the capacitance retention rate (compared with 1 A g-1) is up to 74.1 %, 60.3 %, and 53.1 % at current densities of 4, 7, and 10 A g-1, respectively. After 100 cycles, higher capacitance retention rate is also achieved. Therefore, the results indicate that NiCo2O4 material is the potential electrode material for supercapacitors.

show abstract

Hierarchical interpenetrating rHGO-decorated NiCo2O4 nanowires architectures for high-performance supercapacitors

Cited by 50 publications

References 40 publications

Controlled Synthesis of Bifunctional NiCo₂O₄@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Controlled Synthesis of Bifunctional NiCo₂O₄@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Amorphous TiO₂/C Frameworks as Intercalation Pseudocapacitance Anodes for Fast and Durable Sodium Storage

Sol-gel synthesis and electrochemical performance of NiCo2O4 nanoparticles for supercapacitor applications

Contact Info

Product

Resources

About

Hierarchical interpenetrating rHGO-decorated NiCo2O4 nanowires architectures for high-performance supercapacitors

Cited by 50 publications

References 40 publications

Controlled Synthesis of Bifunctional NiCo2O4@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Controlled Synthesis of Bifunctional NiCo2O4@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Amorphous TiO2/C Frameworks as Intercalation Pseudocapacitance Anodes for Fast and Durable Sodium Storage

Sol-gel synthesis and electrochemical performance of NiCo2O4 nanoparticles for supercapacitor applications

Contact Info

Product

Resources

About

Controlled Synthesis of Bifunctional NiCo₂O₄@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Controlled Synthesis of Bifunctional NiCo₂O₄@FeNi LDH Core–Shell Nanoarray Air Electrodes for Rechargeable Zinc–Air Batteries

Amorphous TiO₂/C Frameworks as Intercalation Pseudocapacitance Anodes for Fast and Durable Sodium Storage