DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 13
·4403-4411
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IF 4.029
Chenle Zhang,Libo Deng,Peixin Zhang,Xiangzhong Ren,Yongliang Li,Tingshu He
The performance of a dye-sensitized solar cell (DSSC) is strongly influenced by the catalytic performance of its counter electrode (CE) materials. Platinum (Pt) is conventionally used as the CE for DSSCs, but it is precious and is readily corroded by the iodide/triiodide electrolyte. Herein, mesoporous NiCo2O4 networks with different types of building blocks were prepared by electrospinning of a composite solution followed by annealing in air, and their performances as CEs in DSSCs were investigated. The honeycomb-like NiCo2O4 exhibited better performance than the nanotube ones, showing a photoelectric conversion efficiency of 7.09% which is higher than that of a standard Pt CE (7.05%) under the same conditions. The enhanced electrode performance was attributed to the relatively larger surface area and higher conductivity. The preparation methods demonstrated in this study are scalable and would pave the way for practical applications of Pt-free DSSCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Yang Wu,Konghu Tian,Ruiwen Shu,Jinbo Zhu,Yin Liu,Chao Zhang,Yanan Huang,Zhihong Chen
Low matching thickness, broad effective absorption bandwidth (EAB, RL < –10 dB) and excellent reflection loss (RL) are desirable properties for the advanced microwave absorption materials (MAMs). We synthesized novel interpenetrating structured rod-like nickel cobaltite (NiCo 2 O 4 )/helical carbon nanotubes (HCNT) composites using the facile hydrothermal technique and heat-treatment process. Owing to the optimum structural design and electromagnetic parameter regulation, the NiCo 2 O 4 /HCNT composites displayed outstanding microwave absorption (MA) across regions of low thickness. When the thickness was only 1.35 mm, the optimized RL and EAB reached –55.9 dB and 4.8 GHz (13.2–18.0 GHz), respectively. Furthermore, the EAB was 10 GHz as the corresponding thickness was regulated with 1.35–2.10 mm, covering both X and the Ku bands. Multiple reflection and scattering, natural resonance, eddy current loss, strong conduction loss, interface polarization, cross-poalarization, and dipolar polarization can be considered to improve MA. Our study proposes a simple approach of synthesizing low-thickness MAMs based on NiCo 2 O 4 and HCNT .
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Materials Today Communications
·
2025
·
IF 4.5
Rui Zhao,Wenbo Jia,Yuxia Shi,Xianhan Shao,Hankun Wang,Tingxi Li,Mingliang Ma,Wenhui Zheng,Yong Ma
In the face of 5 G technology's rapid growth and expansion, the need for advanced electromagnetic wave absorbing materials continues to increase due to their critical role in mitigating interference and ensuring efficient system operations. These materials are essential for effectively reducing signal interference, which, in turn, enhances signal quality and improves the overall performance of communication systems. In this work, ternary core-shell SiO 2 /NiCo 2 O 4 nanosheets/polypyrrole (PPy) (SNCP) fibers have been fabricated using electrospinning and self-assembly methods, achieving outstanding electromagnetic wave absorption performances. At 1.66 mm thickness, the minimum reflection loss (RL min ) reaches −59.87 dB, while at 1.92 mm, the effective absorption bandwidth (EAB) is 5.94 GHz. Additionally, radar cross-section (RCS) simulation outcomes manifest that SNCP exhibits excellent electromagnetic wave attenuation capabilities, with a maximum RCS reduction of 16.27 dB m². The outstanding electromagnetic wave absorption performance is a result of the dielectric properties provided by the SiO 2 fibers matrix, the magnetic properties of the NiCo 2 O 4 nanosheets, the weak conductivity of the PPy shell, and the synergistic interactions and structural effects of the ternary composite. This research offers significant insights into designing and optimizing ternary electromagnetic wave absorbing materials.
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ENERGY & FUELS
·
2021
·
IF 3.605
Xian Wu,Xiaoya Zhou,Libing Hu,Sheng Zhang,Wangguang Wang,Shaochun Tang
Efficient supercapacitors have attracted wide attention by the exploration of hybrid materials integrating the merits of individual components as promising electrode materials. However, the construction of advanced hybrid structures for highly enhanced electrochemical energy storage is still challenging. Herein, integration of a strong compositional synergy between various bimetallic oxides, MCo2O4 (M = Ni, Fe, and so on), and inducing rich defects for more redox sites are proposed. A novel NiCo2O4–FeCo2O4 hybrid array of nanowires with a large number of nanopores and crystal interfaces is synthesized via hydrothermal reactions and fast calcination. The performance of the NiCo2O4–FeCo2O4/carbon cloth electrode is good and is far beyond that of single-component MCo2O4 electrodes, which exhibits a specific capacity of 490 F/g at 4.0 A/g. The integration of bimetallic redox centers reconstructing the electronic coordination and the nanopores providing highly exposed active surfaces and active sites for highly efficient electrolyte ion diffusion contribute to the enhanced performance. An asymmetric solid-state supercapacitor composed of NiCo2O4–FeCo2O4 and graphene (both using carbon cloth as substrates) as the anode and cathode electrodes, respectively, exhibits a high energy density of 88.9 Wh/cm2 (at a power density of 800 mW/cm2). In particular, the flexible asymmetric device exhibits excellent deformation-tolerant electrochemical stability with nearly overlapping cyclic voltammetry curves at varying bending angles. This work proposes additional methodologies to the fabrication of excellent-performance flexible all-solid-state devices for wearable devices.
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ELECTROCHIMICA ACTA
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2025
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IF 5.6
Guangqiu Zhang,Yihang Zhao,Jianwei Zhao,Lirong Qin,Yi Li,Yujing Wang,Yong Tang
Nickel-zinc (Ni-Zn) batteries have attracted significant research interest due to their high safety, low cost, and high theoretical specific capacity. This investigation introduces a simple synthesis route for fabricating a nickel-cobalt-chromium layered double hydroxide/nickel-cobalt oxide (NiCoCr-LDH/NiCo 2 O 4 ) hierarchical composite on nickel foam (NF), aimed at advancing Ni-Zn battery performance. The synergistic integration of uniformly distributed NiCo 2 O 4 nanoneedles with NiCoCr-LDH nanosheets facilitates expedited ion diffusion and proliferates active reaction sites. Under optimized conditions, the NiCoCr-LDH/NiCo 2 O 4 @NF electrode exhibits a superior specific capacity of 234 mAh g⁻ 1 at 1 A g⁻ 1 , coupled with enhanced cycling endurance. When configured into a full cell alongside zinc plate, it attains an energy density of 395.7 Wh kg⁻ 1 and a peak power density of 15.6 kW kg⁻ 1 . Remarkably, the device sustains 90.7% of its initial capacity after an extensive 5,000-cycle operation, underscoring its exceptional prolonged cyclability. This study contributes crucial understandings for guiding the evolution of high-performance supercapacitors and Ni-Zn batteries.
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Science China-Materials
·
2017
·Vol. 60
·期 8
·766-776
·
IF 3.956
Cui Shiqiang,Zhang Jiangjiang,Ding Yaping,Gu Shuqing,Hu Ping,Hu Zongqian
The rectangular flake-like mesoporous NiCo 2 O 4 (meso-NiCo 2 O 4 ) catalysts were first used in glucose bio-sensing and glucose biofuel cell (GBFC) as an enzyme mimic simultaneously. The meso-NiCo 2 O 4 displayed excellent catalytic capability to glucose including a super-fast response time (within 1 s), a super-high sensitivity (662.31 μA (mmol L −1 ) −1 cm −2 ), and a super-low detection limit (0.3 nmol L −1 at S/N = 3) on the sensor. On the other hand, meso-NiCo 2 O 4 provided great values in GBFC as anode material with an open circuit voltage of 0.63 V, a maximum power density of 0.092 mW cm −2 , and a limiting current density of 1.3 mA cm −2 , respectively. The preeminent catalytic abilities may be attributed to the large specific surface area resulting from the mesoporous structure and the surpassing intrinsic catalytic activity of NiCo 2 O 4 itself. These significant findings may promote the development of the supersensitive detection of glucose and will undoubtedly widen the catalytic materials for biofuel cell electrodes.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2026
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IF 5.9
Rui Dong,Peng Chen,Qingyi Zhang,Jiajun Zeng,Fuming Du,Haibing Wang
Hierarchical NiCo 2 O 4 /carbon nanosheets composites were constructed through a template-assisted hydrothermal-calcination strategy. • The carbon nanosheets network improves the charge transfer behavior and enhances the intrinsic active site. • The optimized NiCo 2 O 4 /CNs-2 electrode delivers 285 mV at 10 mA cm −2 with a Tafel slope of 58.2 mV dec −1 for alkaline OER. The oxygen evolution reaction (OER) poses a key kinetic bottleneck for electrochemical water splitting due to its sluggish four-electron transfer kinetics. Spinel NiCo 2 O 4 is a promising non-precious candidate, while its practical application is constrained by poor electrical conductivity, limited stability and insufficient intrinsic activity. Herein, we report a hierarchical composite (NiCo 2 O 4 /CNs), in which NiCo 2 O 4 nanosheets are uniformly anchored onto three-dimensional carbon nanosheets network via a template-assisted hydrothermal strategy. The introduction of CNs simultaneously enables asymmetric Ni 2+ /Ni 3+ and Co 2+ /Co 3+ valence ratio via strong interfacial coupling and ensures rapid electron transfer via the interconnected conductive network. As a result, the optimized NiCo 2 O 4 /CNs-2 composite exhibits enhanced OER performance in alkaline media, with an overpotential of only 285 mV to achieve 10 mA cm −2 and a Tafel slope of 58.2 mV dec −1 . pH-dependence analysis reveals a higher proton reaction order (0.894) than pristine NiCo 2 O 4 (0.641), suggesting an enhanced lattice oxygen involved contribution, which is corroborated by post-OER XPS, Raman, and XRD analyses confirming LOM-triggered surface reconstruction into Ni x Co 1-x (OH) 2 active phase. This work highlights a novel 2D/3D composite strategy that regulates the Charge-transfer behavior of metal oxides through morphological modulation of carbon supports, offering a promising route toward high-performance, durable non-precious metal electrocatalysts for practical water splitting applications.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jiani Chen,Meili Ding,Xiaotong Fu,Jianfeng Yao
Selective oxidation of alkene to valuable chemical feedstocks is challenging due to the seesaw effect between conversion and selectivity. Here, multivariate zeolitic imidazolate frameworks (ZIFs) are transformed into bimetallic oxides with varied morphologies via tannic acid (TA) etching and calcination. Impressively, TA etching results in the formation of oxygen vacancies and pore expansion, and the hollow architecture is generated after pyrolysis, favoring the exposure of more active sites and rapid mass diffusion, as well as inducing prominent void-confinement effects. Besides, the incorporation of nickel ions can introduce an additional type of Lewis acid sites into the resulting bimetallic oxides. The obtained Co3Ni1-TA1.4-10-400 exhibits an effective styrene-to-benzaldehyde oxidation with nearly total conversion and a 99% yield (5 h, 90 °C), approximately 1.9 and 8.3 times higher than those of Co3Ni1-TA1.4-10 (51%) and Co3Ni1-O (12%), respectively. Mechanistic investigations for the conversion of styrene to benzaldehyde further indicate that the reaction possibly proceeds via a synergistic mechanism involving both a metal-peroxide pathway and a free-radical pathway. Furthermore, in the presence of sodium bicarbonate, Co3Ni1-TA1.4-10-400 can prove effective in catalytic epoxidation of styrene. This study provides a valid approach for the construction of ZIF derivatives with abundant oxygen vacancies and unsaturated metal sites as promising catalysts for fine and commodity chemical production.
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Journal of Energy Storage
·
2026
·
IF 10.7
Qihang Zhou,Qingming Zhang,Yuyue Li,Mingpeng Zhao,Zhengtao Qian,Wen Ge,Shukang Deng,Peizhi Yang
This work provides a reliable design paradigm for high-efficiency TMO/TMS heterostructures. • NiCo 2 O 4 and NiCo 2 S 4 are grown on porous carbon via a hydrothermal reaction. • NCO-NCS/HC-1.2 exhibits a specific capacitance of 2034.7 F g −1 at a current density of 1 A g −1 . Traditional NiCo-based oxides and sulfides are widely regarded as promising electrode materials for high-performance energy storage, attributed to their abundant multi-electron reversible redox chemistry. Nevertheless, substantial volume expansion during repeated charge-discharge cycling induces mechanical strain and disrupts ionic transport pathways, leading to kinetic hysteresis in ion diffusion. In comparison, hierarchical porous carbon features low cost and excellent electrical conductivity, making it an ideal composite matrix material. In this study, a hydrothermal method was adopted to modulate the in-situ growth of NiCo 2 O 4 and NiCo 2 S 4 on the surface of biomass-derived porous carbon, thereby constructing a series of composite materials with gradient components and interface coupling effects. Among these composites, NCO-NCS/HC-1.2 with the optimal ratio features a 3D conductive carbon network. The network promotes joint electron and ion transport, yielding a high specific capacitance of 2034.7 F g −1 at a current density of 1 A g −1 . The asymmetric supercapacitor achieved an energy density of 54.3 Wh kg −1 at a power density of 1066.7 W kg −1 and still maintained an energy density of 26.3 Wh kg −1 at an ultra-high power density of 21,333.3 W kg −1 . This hierarchical heterostructure strategy provides a universal design paradigm for developing high-energy-density supercapacitor. Download: Download high-res image (172KB) Download: Download full-size image
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 12
·126508
·
IF 4.386
Li Feng,Yan Xu,Wanting Deng,Yadong Wang,Xiaoqin Min,Xiaoyun Lin,Yongnian Ni
A novel electrochemical non-enzymatic sensor for glucose and H2O2 based on metal organic framework (MOF)-derived cobalt-nickel bimetallic oxides (NiCo2O4) and gold nanoparticle (AuNPs) composite modified glassy carbon electrode (GCE) was fabricated in this paper. The structure and morphology of the prepared materials was successfully characterised by X-ray diffraction (XRD), element mapping images and scanning electron microscopy (SEM). Moreover, the electrocatalytic activity for glucose and H2O2 was investigated at the NiCo2O4/AuNPs/GCE using cyclic voltammetry (CV) and amperometric i–t technique. The catalytic currents for glucose and H2O2 are proportional to their concentrations in the range of 0.2 μM–581 μM and 0.5 μM–1774.5 μM, respectively. The corresponding limits of detection (LOD) were calcuated be 0.0081 μM and 0.181 μM for glucose and H2O2. Furthermore, the NiCo2O4/AuNPs/GCE shows excellent stability, reproducibility and anti-interference ability.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Dongfang Lv,Jingchuang Han,Zhaowu Li,Jie Xiong,Pingfan Du,Lixin Song
Inorganic hole transport materials (HTMs) play an important role for the stability and efficiency of planar perovskite solar cells (PSCs). Among the numerous inorganic HTMs, NiCo 2 O 4 with its excellent performance is the emerging candidate for hole transport layers (HTLs) and is attracting increasing attention. However, the low electrical conductivity and optical transmittance of NiCo 2 O 4 severely limit the device performance. Herein, the Zn 2+ was used to dope NiCo 2 O 4 to improve the electrical conductivity and optical transmittance of NiCo 2 O 4 . And the effects of the concentration of Zn 2+ on the morphology, structure and properties of NiCo 2 O 4 were investigated. The morphology and transparency of Zn x Ni 1-x Co 2 O 4 would not be affected when the concentration of Zn 2+ is below 0.1, but when it is up to 0.15 and 0.2, the morphology of NiCo 2 O 4 clustered together or showed a diamond-shaped block, and the optical transmittance also decreased significantly. Meanwhile, with the increase of doping amount, the conductivity and hole mobility are gradually increased. As a result, the optimal concentration of Zn 2+ is 0.1. Besides, the Zn 0.1 Ni 0.9 Co 2 O 4 possessed a significant improvement in hole extraction and better band alignment compared to the NiCo 2 O 4. And hence, the power conversion efficiency (PCE) of PSCs fabricated in open air is up to 13.41% by using Zn 0.1 Ni 0.9 Co 2 O 4 . This work develops a potential strategy for developing highly efficient and stable PSCs, opens up a new horizon for the development of inorganic HTMs.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Du Huang,Zhenya Lu,Xingyue Liu,Junning Gao,Zhiwu Chen,Xin Wang,Xiaoyi Fu
NiCo 2 O 4 nanoflowers with high specific surface area were prepared on nickel foam (NF) by hydrothermal method and used as frameworks for developing cathode and anode of flexible asymmetric supercapacitor. With the unique nanoflower-like NiCo 2 O 4 arrays as skeleton, the NiCo 2 O 4 /Au/MnO 2 cathode was prepared by gold-spraying and electrochemical deposition and the NiCo 2 S 4 /PPy anode was prepared by second-hydrothermal and electro-polymerization. The hierarchical structured electrodes offer sufficient redox sites and adequate channels for accelerating ion and electron transport between electrodes and electrolyte. Moreover, the NiCo 2 S 4 /PPy was first reported as the anode, and its cycling stability (capacitance retention of 86.04 % after 5000 cycles) and specific capacitance (1612.5F/g at 1 A/g). The assembled flexible all-solid-state asymmetric supercapacitor (NiCo 2 O 4 /Au/MnO 2 // NiCo 2 S 4 /PPy) displays a high energy density of 206.37 Wh kg −1 at a power density of 398.57 W kg −1 and an outstanding cyclability (capacitance retention of 83.41 % after 5000 cycles).
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危险品化学品经营许可证（带存储）