JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Shan Yan,Lina Xu,Jun Jiang,Hongping Xiao,Xinhua Li
Single-material electrodes do not satisfy the demands of high-performance supercapacitors. To exploit the advantages of both oxides and carbon-based materials, a tightly packed Co 3 O 4 /NiCo 2 O 4 /NiO/C&S nanocomposite is fabricated by sintering a Co/Ni-based coordination complex precursor at 400 °C. The composites and basic components are characterized using various techniques, namely, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy , Brunauer–Emmett–Teller specific surface area analysis, and elemental analysis . The electrochemical performance is analyzed by cyclic voltammetry , galvanostatic charge/discharge cycling, and electrochemical impedance spectrometry . A uniform nanocomposite was found to be formed of NiCo 2 O 4 , NiO, and Co 3 O 4 nanoparticles , incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>20,000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The roles of C and S in forming a stable structure are investigated. The results show that a supercapacitor with electrodes made from the as-prepared Co 3 O 4 /NiCo 2 O 4 /NiO/C&S composite will be promising for commercial applications.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 39
·19765-19773
·
IF 7.443
Yudi Mo,Qiang Ru,Junfen Chen,Xiong Song,Lingyun Guo,Shejun Hu,Shaomin Peng
The growth of three-dimensional (3D) porous NiCo2O4 nanowire arrays on a carbon fiber cloth (denoted as NCO@CFC) via a facile low-cost solution method combined with a subsequent annealing treatment is reported. The structure and morphology of the materials were characterized by X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. Owing to the unique 3D hierarchical architecture, the NCO@CFC nanowires as a flexible electrode material for lithium-ion batteries exhibit a stable cycling performance (92.3% retention after 100 cycles), a fairly high rate capacity (507 mA h g−1 at 4000 mA g−1), and an enhanced lithium storage capacity. When employed as an electrode material for sodium-ion batteries, the NCO@CFC is investigated in comparison with a 3D ordered array structure and exhibits similar charge/discharge characteristics and a feasible electrochemical performance. The greatly improved electrochemical performance could be ascribed to the 3D porous nanostructure of the NCO@CFC nanowire arrays together with a novel carbon skeleton, which provides enough space to allow volume expansion during the Li+/Na+ insertion/extraction process and facilitates rapid transport of ions and electrons.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 9
·3667-3676
·
IF 3.269
Hanbing Rao,Zhaoyi Zhang,Hongwei Ge,Xin Liu,Ping Zou,Xianxiang Wang,Yanying Wang
In our work, a NiCo2O4/nitrogen-doped reduced graphene oxide/ionic liquid (NiCo2O4/N-rGO/IL) nanocomposite was prepared using hydrothermal treatment and calcination followed by a facile reaction with stirring. The composite material was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), FTIR spectra and thermogravimetric analysis (TGA). The biosensing properties of NiCo2O4/N-rGO/IL, NiCo2O4/N-rGO and NiCo2O4 towards glucose were studied based on a glassy carbon electrode. The NiCo2O4/N-rGO/IL nanocomposite exhibits excellent electrocatalytic activity towards glucose, with a sensitivity of 3.76 mA mM−1 cm−2 and a good linear response from 0.001 mM to 4.555 mM at a potential of +0.5 V. The limit of detection can reach 0.18 μM. It also shows significant electrochemical sensitivity, reproducibility and long-term stability. The good electrocatalytic activity is attributed to the synergistic effect of the metal oxides, graphene oxide and the IL. The N-doping of rGO accelerates the electron transfer of the IL further and enhances its electrochemical properties. In addition, the sensor is effectively applied to the determination of glucose in a human blood serum sample.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yuhan Wang,Chang Liu,Chao Wang,Qing Hu,Longzhen Ding
Developing synergistic systems and taking environmental risks into account are two necessary aspects of being considered to remove persistent organic pollutants efficiently. Thus, a combined catalytic system uniting the Fenton-like process and simulated solar-light photocatalysis has been constructed. Moreover, a series of NiCo 2 O 4 /HP-UiO-66 catalysts (yNiCo-DUx) were also fabricated to improve tetracycline (TC) removal efficiency. The NiCo 2 O 4 nanoparticles (NPs) and hierarchically porous metal-organic frameworks (HP-MOFs) were synthesised using one-step calcination. The Z-scheme structure of the catalysts was confirmed by ESR, XPS, DRS, time-resolved PL (TR-PL) spectra and the quenching experiments. The NiCo 2 O 4 nanoparticles could be embedded and fixed into the defects of the MOF structure, and the leaching of toxic metals was also significantly suppressed. In the optimal reaction condition with 15NiCo-DU50, sunlight, and peroxymonosulfate (PMS), the total removal efficiency of TC could reach 98.5% within 8 min of irradiation, and the highest % RSE could reach 11.2%. Moreover, the corresponding reaction rate was 28.7, 3.6 and 1.3–10.2 times higher than photocatalysis, Fenton-like processes and other catalysts. Furthermore, the possible degradation mechanism, generation of reactive species and PMS excitation pathways were also investigated in depth. The present study sheds light on the fabrication of HP-MOFs based catalysts and the combination of various methods to eliminate organic pollutants.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jialu Pan,Lin Che,Tong Wei,Yanqing Cong,Shi-Wen Lv
It is of great significance to rationally regulate the activation mechanism of peroxymonosulfate for wastewater treatment. Herein, for the first time, a newly-constructed NiCo 2 O 4 @ZIF-67 core–shell nanocage was employed as a mediator for effective removal of tetracycline (TC). As-prepared NiCo 2 O 4 @ZIF-67 displayed reduced charge transfer resistance and enhanced electron transfer rate. Importantly, more than 99.58% of TC can be degraded within 30 min by developed NiCo 2 O 4 @ZIF-67/PMS system, and the removal efficiency of TOC was as high as 72.81%. Moreover, antimicrobial tests revealed the low toxicity or non-toxic of degradation products. More interestingly, after coating ZIF-67 film on the surface of NiCo 2 O 4 , the electron transfer process among PMS, contaminant and catalyst was enhanced. The radical and nonradical pathways worked in coordination each other and achieved the rapid removal of various organic pollutants. The ZIF-67-derived NiCo 2 O 4 core dominated the generation of reactive oxygen species, while the coated ZIF-67 shell induced the electron transfer from TC to PMS. Besides, the introduction of ZIF-67 not only improved the anti-interference for inorganic anions, but also boosted the water stability, thereby resulting in that NiCo 2 O 4 @ZIF-67 still remained great catalytic performance after repeated use for several times. In short, current work shared a promising approach for wastewater treatment.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zunpeng Hu,Senjie Dong,Quanfeng He,Zihao Chen,Ding Yuan
Developing electrocatalysts that integrate the merits of the hollow structure and heterojunction is an attractive but still challenging strategy for addressing the sluggish kinetics of oxygen evolution reaction (OER) in many renewable energy technologies. Herein, a 3D hierarchically flexible self-supporting electrode with a hollow heterostructure is intentionally constructed by assembling thin NiFe layered double hydroxide (LDH) nanosheets on the surface of metal–organic framework-derived hollow NiCo2O4 nanoflake arrays (NiCo2O4@NiFe-LDH) for rechargeable Zn–air batteries (ZABs). Theoretical calculations demonstrate that the interfacial electron transfer from NiFe-LDH to NiCo2O4 induces the electronic modulation, improves the conductivity, and lowers the reaction energy barriers during OER, ensuring high catalytic activity. Meanwhile, the 3D hierarchically hollow nanoarray architecture can afford plentiful catalytic active sites and short mass-/charge-transfer pathways. As a result, the obtained catalyst exhibits remarkable OER electrocatalytic performance, showing low overpotentials (only 231 mV at 10 mA cm–2, 300 mV at 50 mA cm–2) and robust stability. When assembling liquid and flexible solid-state ZABs with NiCo2O4@NiFe-LDH as the OER catalyst, the ZABs achieve excellent power density, high specific capacity, superior cycle durability, and good bending flexibility, exceeding the RuO2 + Pt/C benchmarks and other previously reported self-supporting catalysts. This work not only constructs an advanced hollow heterostructured catalyst for sustainable energy systems and wearable electronic devices but also provides insights into the role of interfacial electron modulation in catalytic performance enhancement.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yanqing Cong,Wanxing Wang,Xiang Chen,Shi-Wen Lv
Nowadays efficient treatment of emerging organic contaminants is still a complex task with a big challenge. Herein, a novel dandelion-like NiCo 2 O 4 microsphere was synthesized by a simple step-by-step self-assembly strategy, and obtained NiCo 2 O 4 was then as an efficient heterogeneous catalyst to activate PS for rapid degradation of emerging organic pollutants . Importantly, as-prepared NiCo 2 O 4 -300 microsphere not only exhibited great catalytic activity , but also possessed excellent performance stability and structural stability. More significantly, developed NiCo 2 O 4 -300/PS oxidation system displayed strong degradation ability toward typical contaminants, including TC , IBP, SMX, BPA , DFC as well as OFX. TOC analyses revealed that these organic pollutants could eventually be degraded into H 2 O, CO 2 and other byproducts, and wherein degradation byproducts were low toxicity or no toxicity. During the process of PS activation over NiCo 2 O 4 -300, the redox couples of Co 3+ /Co 2+ and Ni 3+ /Ni 2+ provided major catalytic sites, and the redox couples of Ni 3+ /Ni 2+ played a bigger role. Furthermore, it was also found that both SO 4 −• and •OH were main active species in the reaction system. Even in actual water samples, proposed NiCo 2 O 4 -300/PS oxidation system still showed great performance for removing pollutants. In short, current work would provide valuable references for further research.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Lei Yuan,Na Xin,Yu Liu,Weidong Shi
Research on environmentally friendly energy storage devices is an important strategy to solve the energy crisis and environmental pollution. Herein, a novel self-supporting electrode based on multi-dimensional Co 3 O 4 /NiCo 2 O 4 hierarchical flakes coating on graphene/carbon sphere (rGO/CS) conductive substrate is reasonably designed. Firstly, a simple hydrothermal method is used to synthesize NiCo 2 O 4 with both flake and nanoneedle morphology on the rGO/CS substrate. Subsequently, Co 3 O 4 /NiCo 2 O 4 @rGO/CS is obtained by in-situ growth of metal organic frameworks polyhedrons on the surface of NiCo 2 O 4 flakes followed by calcination. In the unique structure, benefitting from the synergy between the substrate and multi-element transition metal oxides, the integrated film shows good conductivity, high specific surface area and abundant active sites. Thus, the binder-free electrode exhibits an ultra-high specific capacitance of 3876.6 F g −1 (538.4 mA h g −1 ) at 1 A g −1 . A hybrid supercapacitor is assembled with activated carbon as the negative electrode and Co 3 O 4 /NiCo 2 O 4 @rGO/CS as the positive electrode, the device shows a highest energy density of 56.5 Wh kg −1 at a power density of 800 W kg −1 . After 6000 charge–discharge cycles, 92.5% of the initial capacitance can be still maintained, indicating its good application prospects in energy storage materials.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 32
·12168-12176
·
IF 4.052
Hanchun Xia,Geng Li,Haoran Cai,Xiaolong Li,Peiheng Sun,Peijia Wang,Jiajie Huang,Liang Wang,Desuo Zhang,Yefeng Yang,Jie Xiong
The development of flexible energy storage devices for portable and wearable electronics has aroused increasing interest. In this work, three-dimensional hierarchical NiCo2O4@NiMn-LDH nanowire/nanosheet arrays have been successfully fabricated on carbon cloth through a facile hydrothermal and calcination synthetic method. Benefiting from the sophisticated hybrid nanoarchitectures with desirable structure and components, the optimized NiCo2O4@NiMn-LDH hybrid electrode is found to deliver a remarkable specific capacity of 278 mA h g−1 at 2 mA cm−2 and a good rate capability of 89.1% retention at 20 mA cm−2. Detailed analysis of the reaction kinetics for the hybrid electrode clearly indicates the dominant diffusion-controlled contribution to the total capacity. In addition, a flexible solid-state hybrid supercapacitor is assembled by taking NiCo2O4@NiMn-LDH and activated carbon as the cathode and anode, respectively, which manifests a maximum energy density of 47 W h kg−1 at a power density of 357 W kg−1 as well as an excellent long-term cycling stability (95.6% retention after 5000 cycles over 8 mA cm−2). Our work demonstrates the great potential of this core/shell hybrid nanostructure as an advanced battery-type electrode for high-performance flexible energy storage devices.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 8
·3632-3641
·
IF 10.733
Hanwei Wang,Lintong Hu,Chao Wang,Qingfeng Sun,Huiqiao Li,Tianyou Zhai
Nanoscale transitional metal oxides (TMOs) are promising anode materials for high-performance lithium-ion batteries (LIBs), but achieving a high-load TMO electrode with excellent conductivity and good cycling stability still remains a big challenge especially for nanosized TMO particles. Herein, we report a novel strategy to prepare checkerboard-like NiCo2O4@C/CNT (N@C/CNT) nanosheets by a facile cellulose template-assisted method. The 2D, 1D and 0D ternary hybrid structures achieve individual dispersion of high-load NiCo2O4 nanoparticle (NP) “chess pieces” (diameter ∼ 25 nm) anchored on C/CNT nanosheets (thickness ∼ 50 nm), in which the CNT “grid lines” and cellulose-derived carbon “chess lattices” act as a high-speed conductive network and loading substrate, respectively. Due to the self-assembly of these nanosheets, the designed electrodes are created with no binder or other additives and possess adjustable thickness, high electrode density and a strong conductivity of 175.9 S cm−1 even at a high NiCo2O4 content of 85.1%. The binder-free electrode exhibits superior rate capabilities (1208 mA h g−1 at 0.1 A g−1 and 830 mA h g−1 at 20 A g−1) and little capacity fading at 20 A g−1 over 4000 cycles. Such a strategy enables an ultrahigh mass loading of 12.8 mg cm−2 (2.5 g cm−3) with the same time high electrochemical performances.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 38
·31925-31933
·
IF 3.289
Yudi Mo,Qiang Ru,Xiong Song,Junfen Chen,Xianhua Hou,Shejun Hu,Lingyun Guo
Porous NiCo2O4 ellipsoids supported by flexile carbon nanotubes (denoted as NCO/CNTs) were successfully synthesized by a facile hydrothermal method followed by subsequent annealing in air. The structure and morphology of the materials were characterized by X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. When evaluated as anode materials for lithium-ion batteries (LIBs), the NCO/CNTs composites exhibit a high and stable reversible capacity (1273.8 mA h g−1 at 500 mA g−1), excellent rate capability (593.0 mA h g−1 at 4000 mA g−1), and long cycling stability (no capacity fade over 200 cycles). The improved performance of these LIBs can be attributed to the unique 3D porous NCO/CNTs composite frameworks, which will enhance electrical conductivity of the materials, facilitate fast ion/electron transport through the electrode, and accommodate massive volume expansion/contraction during cycling. Furthermore, the synthetic strategy is simple but very effective, it can be easily extended to prepare many other metal oxides with the CNTs acting as the conductive network and used as promising anode materials for high-performance LIBs.
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高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 1
·172-182
·
IF 4.036
Bingrong Wang,Yang Cao,Yong Chen,Ruzhi Wang,Xiaohong Wang,Xiaoyong Lai,Chunhui Xiao,Jinchun Tu,Shujiang Ding
NiCo2O4 nanoflowers were synthesized through a microwave-assisted hydrothermal method and used as a type support for Ni(OH)2 nanoparticles. In the three-dimensional NiCo2O4 nanoflowers, two-dimensional ultrathin nanosheets supported the Ni(OH)2 nanoparticles by homogeneous precipitation. The materials were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The electrochemical oxidation of methanol was probed through the NiCo2O4/Ni(OH)2 modification on a glassy carbon electrode in an alkaline medium by employing cyclic voltammetry (CV) and chronoamperometry (CA). The current density of the NiCo2O4/Ni(OH)2 electrode in 1 M KOH with 0.5 M methanol ascends to 92.3 A g−1 and restores to 94.6% of the primitive value through the replacement with a new solution after a long-term CV cycling (500 cycles). Therefore, the compounds further corroborate their excellent electrocatalytic activity and superb perennial stability for methanol oxidation. This study demonstrates that NiCo2O4/Ni(OH)2 is a peculiar material with an outstanding performance in direct methanol fuel cells.
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高影响因子
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