ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Li Ma,Han Zhou,Shuli Xin,Chunhui Xiao,Fei Li,Shujiang Ding
A novel nanosheet-structured ZnCo 2 O 4 /carbon nanotubes ( i.e. , ZnCo 2 O 4 nanosheets/carbon nanotubes (ZnCo 2 O 4 NSs/CNTs)) composite is successfully synthesized. Its catalytic activity towards oxygen reduction reaction (ORR) in alkaline electrolyte is evaluated by both cyclic voltammetry (CV) and scanning electrochemical microscopy (SECM). The CV results demonstrate that the ZnCo 2 O 4 NSs/CNTs composite has good ORR catalytic activity, which is better than those of ZnCo 2 O 4 , CNTs, physically mixed ZnCo 2 O 4 and CNTs, and Co 3 O 4 NSs/CNTs. It could attribute to the unique ultrathin nanosheet structure and the synergetic effects of ZnCo 2 O 4 and CNTs. Through recording the ORR currents using a microelectrode above the catalyst sample surfaces with applying different sample potentials, the differences in the local catalytic activities of these catalysts are simultaneously investigated and visualized by SECM. The obtained SECM results agree well with the CV results and also as important complements to the CV measurements. Our work proves the good ORR catalytic performance of the nanosheet-structured ZnCo 2 O 4 /CNTs composite and introduces the SECM technique as a rapid screening method for predicting the ORR catalytic performances of the mixed transition metal oxides hybrids with providing both qualitative and quantitative local catalytic activity information.
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Nanoscale
·
2016
·Vol. 8
·期 36
·16349-16356
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IF 7.76
Fengdong Qu,Huifang Jiang,Minghui Yang
The rational design of nanoscale metal oxides with hollow structures and tunable porosity has stimulated tremendous attention due to their vital importance for practical applications. Here, we report the designed synthesis of ZnO/ZnCo2O4 hollow core–shell nanocages (HCSNCs) through a metal–organic framework (MOF) route. The strategy includes the synthesis of a zeolite imidazolate framework-8 (ZIF-8)/Co–Zn hydroxide core–shell nanostructure precursor and subsequent transformation to ZnO/ZnCo2O4 HCSNCs by thermal annealing of the as-prepared precursor in air. Various techniques were employed for characterization of the structure and morphology of the as-prepared ZnO/ZnCo2O4 HCSNCs. When applied as a gas sensing material, the ZnO/ZnCo2O4 HCSNCs show enhanced sensitivity to xylene when compared with ZnCo2O4 shells as well as ZnO nanocages (NCs). In addition, excellent reversibility and superior selectivity of the sensor were observed. The remarkable enhancement in the gas-sensing properties of the ZnO/ZnCo2O4 HCSNCs is attributed to their unique structure and a synergistic effect of ZnO and ZnCo2O4.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Tianli Han,Jing Xu,Kehao Tao,Chenchen Zhang,Lixing Li,Xu Ge,Xueke Liang,Panya Zuo,Yiwen Xie,Jinjin Li,Jinyun Liu
The shuttle effect of polysulfides is one of the most severe issues in lithium–sulfur (Li–S) batteries. Here, we develop a graphene quantum dot (GQD)-decorated hollow porous ZnO/ZnCo2O4 as a sulfur host, which effectively immobilizes polysulfides and thus achieves good electrochemical performances. Polar ZnO and ZnCo2O4 as double shields show strong adsorption toward polysulfides as demonstrated by using density functional theory calculations, GQDs in shells improve conductivity, and a hollow porous morphology accommodates volume changes of sulfur upon cycling. The ZnO/ZnCo2O4/GQDs@S cathode displays high performances including a stable capacity of 797 mAh g–1 after 200 cycles at 0.2 C, reversible rate performance after three rounds of measurements, and good tolerance under low and high temperatures. These findings will find important applications for engineering many high-performance materials for Li–S batteries and accelerating applications.
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RSC Advances
·
2019
·Vol. 9
·期 56
·32889-32897
·
IF 3.049
Wanjuan Cong,Rui Miao,Bairui Tao,Fengjuan Miao
ZnCo2O4 nanosheets were successfully arrayed on a Ni foam surface with graphene using a hydrothermal method followed by annealing treatment; then MnO2 nanoparticles were electrodeposited on the ZnCo2O4 nanosheets to obtain a synthesized composite binder-free electrode named MnO2/ZnCo2O4/graphene/Ni foam (denoted as MnO2/ZnCo2O4/G/NF). After testing the binder-free composite electrode of MnO2/ZnCo2O4/G/NF via cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy testing, we found that it exhibited ultrahigh electrochemical properties, with a high specific areal capacitance of 3405.21 F g−1 under a current density of 2 A g−1, and wonderful cycling stability, with 91.2% retention after 5000 cycles. Moreover, an asymmetric supercapacitor (ASC) based on MnO2/ZnCo2O4/G/NF//G/NF was successfully designed. When tested, the as-designed ASC can achieve a maximum energy density of 46.85 W h kg−1 at a power density of 166.67 W kg−1. Finally, the ASC we assembled can power a commercial red LED lamp successfully for more than 5 min, which proves its practicability. All these impressive performances indicate that the MnO2/ZnCo2O4/graphene composite material is an outstanding electrode material for electrochemical capacitors.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21569-21577
·
IF 7.443
Zhaoqiang Li,Longwei Yin
A sandwich-like structure with reduced graphene oxide (RGO) wrapped MOF-derived ZnCo2O4–ZnO–C polyhedrons on nickel foam as an anode for high performance lithium ion batteries (LIBs) is for the first time reported via simply growing MOFs on Ni foam, and wrapping graphene oxide nanosheets on MOFs, and then annealing under a N2 atmosphere. It should be noted that the MOF-derived porous products are composed of carbon-coated spinel ZnCo2O4–ZnO nanoparticle polyhedrons. When tested as anodes for LIBs, the unique RGO/ZnCo2O4–ZnO–C/Ni sandwich-structured LIB anodes exhibit superior coulombic efficiency, excellent cycling stability and rate capability. The in situ formed carbon layers outside the ZnCo2O4–ZnO act as not only a conductive substrate but also a buffer layer for volume changes. The open pores in ZnCo2O4–ZnO–C polyhedrons provide sufficient electrolyte as well as serve as cushion space to further alleviate volume changes. The RGO nanosheets act as a flexible protector to firmly fix polyhedrons on the Ni foam, as well as a conductive substrate to wire up all the polyhedrons. The interconnected carbon layers and two high conductive substrates (RGO and Ni foam) together form an unhindered highway for charge transfer during discharge/charge processes, promising good electrochemical performance.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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功能材料
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固态化学
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电极工程
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Aijuan Xie,Linghui Cao,Tianyu Shen,Yuanxinyi Zhou,Haoye Wang,Shiping Luo
As para -aminophenol (PAP) is toxic to humans, causing skin irritation, eye damage, and central nervous system depression, and it can form as a degradation product of paracetamol (PAT) under certain conditions, the simultaneous determination of PAP and PAT is crucial. This work presents the fabrication of three-dimensional ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs hybrid for the simultaneous determination of PAP and PAT using ZIF-8/67@Fe 3 O 4 as precursor and MWCNTs as conductive substrate. The ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs/GCE sensor exhibits linear ranges 1.0–150.0 μM with detection limits of 0.033 μM and 0.018 μM for PAP and PAT, respectively. The developed sensor was successfully used for the determination of PAP and PAT in acetaminophen tablets and lake water with satisfactory results.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Wang Liping,Tao Xin,Li Renxing,Jiang Lirong,Chen Lin,Li Bingqian
Hydrogen is recognized as a clean and efficient energy carrier, and photocatalytic hydrogen generation represents a pivotal technology for sustainable energy development. In this work, a highly active noble metal-free ZnCo 2 O 4 /ZnO/C composite has been successfully synthesized via in situ carbonization of a ZnCo-based Prussian blue analogue (PBA), exhibiting remarkable photocatalytic hydrogen generation activity. Under simulated solar irradiation, the optimized composite achieves a high hydrogen generation rate of 2039.3 μmol/(g·h), along with excellent stability. The significantly enhanced photocatalytic activity originates from a unique S-scheme heterojunction charge transfer mechanism and multi-component synergistic effects. Specifically, the intimate interfacial contact among graphitic carbon, ZnCo 2 O 4 , and ZnO facilitates efficient separation and migration of photogenerated electron–hole pairs. The S-scheme mechanism not only preserves photogenerated electrons with strong reduction capability but also enhances charge carrier utilization. Furthermore, the graphitic carbon improves the electrical conductivity and light-harvesting capability. These factors are responsible for the remarkable photocatalytic performance and good stability. This work provides a compelling demonstration of utilizing PBA-derived carbonization as a versatile platform for fabricating efficient, stable, and scalable photocatalysts for practical hydrogen production.
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Analytical Methods
·
2022
·Vol. 14
·期 43
·4330-4337
·
IF 3.532
Zhikun Hu,Peng Zhao,Jiawei Li,Yuanyuan Chen,Huisi Yang,Jiaying Zhao,Jiangbo Dong,Na Qi,Mei Yang,Danqun Huo,Changjun Hou
Metal–organic frameworks derived from ternary metal oxide directly grown on the conductive substrate have attracted great interest in electrochemical sensing. In this work, metal–organic framework-derived ternary ZnCo2O4 nanoplate arrays that were grown on carbon cloth (ZnCo2O4 NA/CC) are fabricated and applied for the electrochemical determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). Field emission scanning electron microscope (FESEM) reveals that a network-like CC substrate is covered with considerable nanoplate arrays, presenting a large specific area. X-ray photoelectron spectroscopy (XPS) demonstrates the nanoplate arrays to be composed of ZnCo2O4. Benefiting from the unique array morphology and ternary element composition, the ZnCo2O4 NA/CC shows desirable performances for simultaneous detection of AA, DA, and UA. The individual detection limits are 7.14 μM for AA, 0.25 μM for DA, and 0.33 μM for UA. Additionally, the ZnCo2O4 NA/CC is successfully applied for the quantitative determination of AA, DA, and UA in spiked serum samples, showing its great application potential.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiaoqin Wei,Hao Guo,Zongyan Lu,Lei Sun,Zhilan Pan,Bingqing Liu,Liping Peng,Wu Yang
Uric acid and dopamine are closely related to the health of the organism, so it is important to determine them simultaneously and efficiently. In this paper, the metal-organic framework DUT-67 was in situ grown on the surface of bimetallic oxide ZnCo 2 O 4 nanoflowers , and then ultrasonically compounded with multi-walled carbon nanotubes (MWCNTs) to prepare DUT-67/ZnCo 2 O 4 -MWCNTs composite. The prepared composite was characterized by XRD , SEM, XPS , FTIR, BET and other techniques. Finally, an electrochemical sensor based on DUT-67/ZnCo 2 O 4 -MWCNTs composite modified glassy carbon electrode for simultaneous detection of dopamine (DA) and uric acid (UA) was fabricated. The introduction of ZnCo 2 O 4 into the composite efficiently overcame the disadvantage of the easy aggregation of DUT-67 and produced a synergistic effect with MWCNTs. The electron transfer rate between the electrode and the electrolyte solution was accelerated, and the detection signals of the target molecules were amplified. After characterizing the electrochemical properties of the composite electrode, it was found that the constructed electrochemical sensor showed low detection limits for DA and UA, which were 12 nM and 8.7 nM, respectively, and the wide linear range of 1.0–180.0 μM. Besides, the sensor had excellent reproducibility, repeatability, anti-interference and stability. The proposed sensor was also successfully used to determine the contents of DA and UA in dopamine injection and urine samples with relatively satisfactory recovery rates. This work not only provides a new strategy for the preparation of MOF modified electrodes , but also has a potential application prospect in bioassays.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Yan Zhong,Tianli Han,Mengying Cheng,Lin Deng,Chaoquan Hu,Qiya He,Huigang Zhang,Jinyun Liu
Current lithium‑sulfur (Li S) batteries have some severe issues such as shuttle effect of polysulfides and volumetric expansion of sulfur, even though their high theoretical energy density is attractive. Herein, we present a porous multi-walled ZnCo 2 O 4 sphere prepared by a self-reduction approach as sulfur host for Li S battery cathode. During the annealing of an inorganic-organic hybrid precursor, ZnCo 2 O 4 spheres are partially reduced by the released carbon monoxide , resulting in the formation of ZnO and CoO nanoparticles which are subsequently etched by acid, finally forming mesopores throughout the multi-walled ZnCo 2 O 4 spheres. The multi-walled ZnCo 2 O 4 provides sufficient space for accommodating the volumetric change of sulfur. The adsorption measurements show that the multi-walled ZnCo 2 O 4 can adsorb the polysulfides efficiently, which suppresses the shuttle effect. After cycling 1000 times at a rate of 0.5C, the multi-walled ZnCo 2 O 4 @S composite remains a capacity of 590 mAh g −1 . The rate-performance is well recoverable during repeated tests. Moreover, the capacities at relatively low and high temperatures of − 5 and 50 °C are 654 and 619 mAh g −1 after 100 cycles, respectively, indicating a potential for applications
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiawei Long,Tianli Han,Yingyi Ding,Chaoquan Hu,Jinyun Liu
Biomimetic materials are receiving increasing attention as potential candidates for secondary battery systems owing to unique structures and properties. Here, we develop a biomimetic composite composing of sea anemone-shaped hollow SnO 2 in-situ co-coating with ZnCo 2 O 4 nanoparticles encapsulated by a carbon shell. The biomimetic SnO 2 @ZnCo 2 O 4 @C-based Li-ion battery anode shows a stable capacity of 700 mAh g −1 after 350 cycles, a Coulombic efficiency exceeding 99% and a repeatable rate-performance. Low reaction barriers and rapid diffusion kinetics of Li ions are verified by using galvanostatic intermittent titration technique analysis. Moreover, a full cell composing of a SnO 2 @ZnCo 2 O 4 @C anode and a LiCoO 2 cathode exhibits 520 mAh g −1 ; while working as a slurry battery anode, the sea anemone-shaped SnO 2 @ZnCo 2 O 4 @C also displays high capacity and Coulombic efficiency after 100 cycles. The high performances of the biomimetic composite when working at different battery systems enable it to be applicable broadly.
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TALANTA
·
2025
·
IF 6.1
Shaowen Chen,Dongfei Chen,Yujie Shi,Renjie He,Xiaochan Wang,Gang Liu,Guo Zhao
Accurate detection of Hg(II) in soil is critical due to their severe environmental and heath risks. However, interference from soil organic matter, particularly humic acid (HA), complicates electrochemical detection by forming stable complexes with Hg(II), suppressing signal in square wave anodic stripping voltammetry (SWASV). This study introduces a novel pretreatment method using oxygen vacancy-rich ZnCo 2 O 4 nanocages (OVs-ZnCo 2 O 4 HNCs) to activate peroxymonosulfate (PMS) and generate sulfate radicals (·SO 4 − ). These radicals disrupt HA-Hg(II) complexes, restoring Hg(II) to its free, electroactive state for accurate detection. Optimized parameters, including ZnCo 2 O 4 loading (9 mg), PMS concentration (6 mg/L), and activation pH (3), enabled maximum signal recovery within 1.5 min. Comprehensive characterization confirmed the efficient catalytic activity of OVs-ZnCo 2 O 4 HNCs. The method demonstrated high sensitivity (LOD = 0.27 μg/L) and robustness in real soil samples, highlighting its potential for environmental monitoring and heavy metal analysis.
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