DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 20
·6718-6729
·
IF 4.174
To Van Nguyen,Le The Son,Vu Van Thuy,Vu Dinh Thao,Masahito Hatsukano,Koichi Higashimine,Shinya Maenosono,Sang-Eun Chun,Tran Viet Thu
We report the synthesis of manganese-doped nickel cobalt oxide (Mn-doped NiCo2O4) nanoparticles (NPs) by an efficient hydrothermal and subsequent calcination route. The material exhibits a homogeneous distribution of the Mn dopant and a battery-type behavior when tested as a supercapacitor electrode material. Mn-doped NiCo2O4 NPs show an excellent specific capacity of 417 C g−1 at a scan rate of 10 mV s−1 and 204.3 C g−1 at a current density of 1 A g−1 in a standard three-electrode configuration, ca. 152–466% higher than that of pristine NiCo2O4 or MnCo2O4. In addition, Mn-doped NiCo2O4 NPs showed an excellent capacitance retention of 99% after 1000 charge–discharge cycles at a current density of 2 A g−1. The symmetric solid-state supercapacitor device assembled using this material delivered an energy density of 0.87 μW h cm−2 at a power density of 25 μW h cm−2 and 0.39 μW h cm−2 at a high power density of 500 μW h cm−2. The cost-effective synthesis and high electrochemical performance suggest that Mn-doped NiCo2O4 is a promising material for supercapacitors.
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zixing Wang,Hai Su,Fangyan Liu,Xiang Chu,Cheng Yan,Bingni Gu,Haichao Huang,Tao Yang,Ningjun Chen,Yu Han,Weili Deng,Haitao Zhang,Weiqing Yang
As in the case of supercapacitors , spinel NiCo 2 O 4 shows the main drawbacks of objectionable pseudocapacitive mechanism, low-voltage polarization effect and confined ion-reaction dynamics, which result in constrained development, narrow work voltage, and low loading mass. Herein we combined two strategies to address these issues. The first one is to design the flower-like NiCo 2 O 4 through Ostwald ripening of ultrathin Ni-Co layered double-hydroxide petals. And the second one is to balance the asymmetrical capacitance for further promoting capacitive behavior. With rationally designing the nano-/micro-structures, flower-like NiCo 2 O 4 shows highly porous ultrathin petals interconnected with each other and massive interspaces between the petals. This unique microstructure endows flower-like NiCo 2 O 4 with rapid electrolyte ions diffusion and mass transfer reaction. Consequently, the flower-like NiCo 2 O 4 electrodes exhibit a high capacity of ∼350 C g −1 even the loading mass of up to 9 mg cm −2 . More importantly, the hybrid supercapacitors , assembled with flower-like NiCo 2 O 4 as cathode, deliver a high specific capacity of ∼85 F g −1 with capacitive ratio up to 74.3%, and a high working voltage of 1.55 V. The transformation of conventional battery-like materials into novel capacitive dominated materials through nano/micro-structural design and balance of asymmetrical capacitance is helpful to further understand the pseudocapacitive mechanism of transition metal oxides/sulfides and therefore will promote their practical application in next-generation of hybrid supercapacitors.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Juan Yang,Hangyu Tian,Jingjing Tang,Tao Bai,Lihua Xi,Sanmei Chen,Xiangyang Zhou
The NiCo 2 O 4 -anchored reduced graphene oxide (NiCo 2 O 4 @rGO) nanoplates have been synthesized by a facile self-assembly process. The morphology, crystalline structure and electrochemical performance of the materials have been investigated comprehensively. The results of SEM manifest that NiCo 2 O 4 particles have been densely anchored on the surface of rGO with a mesoporous structure, and the morphology is tunable via altering concentration of urea during the preparation process. Due to the high ratio of NiCo 2 O 4 in the composite and the plate structure, the electrochemical performance of as-prepared material has been greatly improved. When evaluated as anode materials in lithium ion batteries (LIBs), the as-prepared NiCo 2 O 4 @rGO nanocomposite delivers a reversible capacity of 994 mAh g −1 at a current density of 200 mA g −1 with outstanding rate capability, revealing that it could be a promising anode for LIBs.
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高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Zongxi Zhang,Jiancheng Zhao,Mei Hong,Shuai Chen,Yan Qiao
The strategies for optimizing the morphology/structure and regulating the active sites of materials are effective ways to improve their electrocatalytic performance in the hydrogen evolution reaction (HER) and electrooxidation reaction. Herein, we demonstrate a facile strategy for constructing a NiO/NiCo2O4 porous nanowire catalyst on nickel foam (NiO/NiCo2O4/NF) as a bifunctional electrocatalyst to enhance the electrocatalytic performance for coupling the HER with the glucose oxidation reaction (GOR). Benefiting from the unique 1D porous nanowire structure and enhanced interfacial synergistic effect of the bicomponent catalyst, optimized NiO/NiCo2O4/NF-300 exhibited remarkable electrocatalytic activities for the GOR and HER with low potentials of 1.128 V and 0.212 V, respectively, at 100 mA cm−2. Moreover, the GOR exhibited a high yield of 72% for formic acid. This study provides a promising and simple strategy for the construction of 1D NiO/NiCo2O4 porous nanowire electrocatalysts with rich heterogeneous interfaces and paves a facile pathway for accelerating biomass electrochemical reaction-assisted hydrogen production.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuwen Chen,Ke Zhu,Wenlei Qin,Zhiwei Jiang,Zhuofeng Hu,Mika Sillanpää,Kai Yan
Spinel oxides are recognized as promising Fenton-like catalysts for the degradation of antibiotics. However, the catalytic performance is restrained by the poor electron transfer rate (ETR). Herein, hollow NiCo 2 O 4 @C nanocages are rationally designed and prepared to accelerate ETR in peroxymonosulfate (PMS) activation for tetracycline (TC) degradation. Enhanced ETR of the NiCo 2 O 4 @C/PMS system is due to three aspects: (1) The hollow nanocage facilitates the diffusion and adsorption of TC, improving the ion transfer at a macroscopic level; (2) Electron reconfiguration in octahedral sites of NiCo 2 O 4 increases the ratio of Co 2+ , resulting in highly efficient PMS activation; (3) In-situ generated carbon acts as “electron shuttles”, improving the electrical conductivity of catalysts at a microscopic level. As a result, the NiCo 2 O 4 @C demonstrates rapid ETR, leading to a high-efficiency activation of PMS. The NiCo 2 O 4 @C/PMS system exhibits exceptional TC degradation efficiency and reusability. Non-radical pathway, including 1 O 2 and direct electron transfer, dominates the system. This work offers a feasible strategy for enhancing electron transfer in the Fenton-like system.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 3
·556-565
·
IF 7.2
Tian Konghu,Yang Hang,Zhang Chao,Shu Ruiwen,Shao Qun,Liu Xiaowei,Gao Kaipeng
Carbon-based foams with a three-dimensional structure can serve as a lightweight template for the rational design and controllable preparation of metal oxide/carbon-based composite microwave absorption materials. In this study, a flake-like nickel cobaltate/reduced graphene oxide/melamine-derived carbon foam (FNC/RGO/MDCF) was successfully fabricated through a combination of solvothermal treatment and high-temperature pyrolysis. Results indicated that RGO was evenly distributed in the MDCF skeleton, providing effective support for the load growth of FNC on its surface. Sample S3, the FNC/RGO/MDCF composite prepared by solvothermal method for 16 h, exhibited a minimum reflection loss (RL min ) of −66.44 dB at a thickness of 2.29 mm. When the thickness was reduced to 1.50 mm, the optimal effective absorption bandwidth was 3.84 GHz. Analysis of the absorption mechanism of FNC/RGO/MDCF revealed that its excellent absorption performance was primarily attributed to the combined effects of conduction loss, multiple reflection, scattering, interface polarization, and dipole polarization.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yi-Peng Dong,Jiang-Bo Chen,Jie Ying,Yu-Xuan Xiao,Yuan Tian,Ling Shen,Lei Xia,Ge Tian,Si-Ming Wu,Yi Lu,Xiao-Yu Yang
Optimizing the efficiencies of both electron transport and chloridion repulsion are highly desired for achieving high-performance oxygen evolution reaction (OER) electrocatalysts in seawater oxidation, but still remains a huge challenge. In this study, an efficient synthetic method is developed to successfully synthesize a novel heterogeneous hollow polyhedron nanocages (denoted as NiCo 2 O 4 /NiCoP) with directional electron transport and strong chloridion repulsion properties, which profits from its diverse work functions and anion electrostatic repulsion in heterojunction nanostructure, respectively. Accordingly, NiCo 2 O 4 /NiCoP exhibits superior OER activity in 1 M KOH (η = 325 mV@10 mA cm −2 ) and alkaline simulated seawater (η = 340 mV@10 mA cm −2 ), as well as outstanding long-term stability. Density functional theory calculations demonstrate that the construction of NiCo 2 O 4 /NiCoP heterojunction promotes the directional electron transport in the heterogeneous interface and enables strong chloridion repulsion in comparison with individual NiCo 2 O 4 and NiCoP, thus largely improving its OER performance in alkaline simulated seawater.
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高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 13
·3975-3983
·
IF 6.1
Huiqin Yu,Fang Li,Jing Cao,Shifu Chen,Haili Lin
Developing highly active and stable bifunctional electrocatalysts for the oxidation of alcohols is critical for energy and chemical conversion. Herein, a NiCo2O4 nanowire on ultrathin porous carbon (NiCo2O4/C) was fabricated and exhibits superior electrocatalytic performance for both hydrogen evolution and benzyl alcohol (BA) oxidation in comparison with pristine NiCo2O4 free of carbon. It only needed 1.36 V vs. RHE to afford a current density of 50 mA cm−2 for BA oxidation. The overpotential for the HER (η10) is −93.0 mV vs. RHE. Furthermore, high yield (96.0%) and faradaic efficiency (98.6%) of benzoic acid were achieved in 10 consecutive stability tests. The outstanding electrocatalytic activity can be attributed to the following aspects: (1) the hierarchical architecture exposed more catalytic active sites and enhanced mass transport; (2) ultrathin porous carbon strengthened the affinity for the reaction medium; (3) strong electronic interactions optimized the energy band structure. DFT simulations proved that the Gibbs free energy of the rate-determining step was reduced when coupling with ultrathin porous carbon, thus lowering the energy barrier and accelerating the reaction process. Theoretical calculations further reveal that the moderate downshift in the Ed energy levels, which balance the adsorption and desorption of the intermediates, is the intrinsic reason for the promoted oxidation activity. This work could provide valuable insights into the design of highly efficient bifunctional electrocatalysts.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Weiwei Guo,Jia Yi,Song Wang,Hejing Zhang
Acetone(C 3 H 6 O), a transparent and colorless organic compound, poses significant risks to human health and the environment. We synthesize the NiCo 2 O 4 -BiVO 4 forming an intimate sandwich structure using hydrothermal method for acetone detection. To characterize the as-prepared samples, XRD, XPS, SEM, UV–vis, and EIS are used. Among the pure NiCo 2 O 4 , BiVO 4 , 0.2BiVO 4 -NiCo 2 O 4 , 0.3BiVO4-NiCo 2 O 4 , and 0.4BiVO 4 -NiCo 2 O 4 , the 0.3BiVO 4 -NiCo 2 O 4 sensor exhibits (26.7) toward 30 ppm acetone, which is around double times higher than that of pure NiCo 2 O 4 at 250°C. Furthermore, the 0.3BiVO 4 -NiCo 2 O 4 composite exhibits rapid response-recovery kinetics, excellent humidity stability, and a favorable selectivity towards acetone. Drawing upon these characterizations and gas sensing test outcomes, a mechanism for the enhanced gas sensing properties of BiVO 4 -NiCo 2 O 4 is proposed. The integration of NiCo 2 O 4 with BiVO 4 to create BiVO 4 -NiCo 2 O 4 emerges as an effective approach to enhance the performance of acetone gas sensors.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Ying Liu,Pu Liu,Wei Qin,Xiaoju Wu,Guowei Yang
To explore the surface state of electrocatalysts , herein we developed a surface laser modification (pulsed laser ablation , PLA) approach for the fabrication of NiCo 2 O 4-δ with substantial inner oxygen vacancies (Vo ·· ) and higher exterior Ni 3+ /Ni 2+ ratio. The separated NiCo 2 O 4 nanoplates were transformed to cross-linked NiCo 2 O 4-δ nanostructure through PLA strategy. As compare with the primordial NiCo 2 O 4 produce, the laser-modificated NiCo 2 O 4-δ exhibits higher capacitance, lower overpotential and better electrocatalytic performance. The first-principles calculation proves that the additional energy level is introduced between the valence band and conduction band of L-NiCo 2 O 4-δ . The additional energy level not only benefits the hopping of electrons, but also inhibits the recombination of electron-hole pairs. The X-ray photoelectron spectrum (XPS) confirms that the active sites of the electrocatalytic reaction are Vo ·· , suggesting that the electron structure of catalyst could be adjusted by PLA. The high electrocatalytic activity of laser-modificated NiCo 2 O 4-δ could be ascribed to the synergistic effect of increased number of inner Vo ·· , higher electrochemically active surface area , and dominated Ni oct . Our findings might inspire new thoughts on the tuning the surface state and electronic structure of electrocatalyst.
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高影响因子
Frontiers of Materials Science
·
2020
·Vol. 14
·期 4
·450-458
·
IF 1.747
Han Dandan,Wei Jinhe,Wang Shanshan,Pan Yifan,Xue Junli,Wei Yen
The unique feather-like arrays composing of ultrathin secondary nanowires are fabricated on nickel foam (NF) through a facile hydrothermal strategy. Thus, the enhancement of electrochemical properties especially the low charge transfer resistance strongly depends on more active sites and porosity of the morphology. Benefiting from the unique structure, the optimized NiCo 2 O 4 electrode delivers a significantly lower charge transfer resistance of 0.32 Ω and a high specific capacitance of 450 F·g −1 at 0.5 A·g −1 , as well as a superior cycling stability of 139.6% capacitance retention. The improvement of the electrochemical energy storage property proves the potential of the fabrication of various binary metal oxide electrodes for applications in the electrochemical energy field.
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高影响因子
Materials Today Physics
·
2021
·
IF 9.298
A. Wang,Y. Hu,H. Wang,Y. Cheng,T. Thomas,R. Ma,J. Wang
To improve the structure-dominant activity, rational design of oxide-based materials remains challengeable in bifunctional oxygen electrocatalysis , especially from the perspective of electronic modulation. Herein, we demonstrate that the electron configuration of inverse spinel NiCo 2 O 4 can be activated by controllable substitution of Fe into the octahedral centers. Fe-substituted NiCo 2 O 4 nanoparticles embedded in porous N-doped carbon nanofibers (NiCo 2- x Fe x O 4 /NCNF), which were synthesized by scalable electrospinning, exhibit a correlated relationship with Fe atomic content and achieve an optimal bifunctional activity (ΔE = 0.74 V) at 0.25 at.%. Theoretical calculation shows that the substitution of Co 3+ by Fe 3+ modulates the electrons filling in e g orbital of octahedral cation via delocalizing the electrons around O anions. The increased density of states around the Fermi level further regulate the adsorption energy of oxygen intermediates and lead to better bifunctional performance than commercial Pt/C + RuO 2 in rechargeable Zn-air battery. This work provides a new pathway to develop cost-effective bifunctional electrocatalysts for electrochemical energy storage and conversion .
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高影响因子
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