INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Hongyu Ma,Xi Wu,Xinghua Li,Jie Liu,Haipeng Dong,Yu Liu,Luyao Niu,Fang Zhang,Wenbo Wang,Changlu Shao,Xiaowei Li,Yichun Liu
Photocatalytic carbon dioxide (CO2) reduction for high-value hydrocarbon fuel production is a promising strategy to tackle global energy demand and climate change. However, this technology faces formidable challenges, primarily stemming from low yield and poor selectivity of C2 products of the desired hydrocarbon fuels. This study reported ZnO/ZnCo2O4 Janus hollow nanofibers (ZnO/ZCO JHNFs) prepared by electrospinning and atomic layer deposition. Photocatalytic tests revealed an ethanol yield of 4.99 μmol g–1 h–1 for ZnO/ZnCo2O4 JHNFs, surpassing mixed ZnO/ZnCo2O4 nanofibers (ZnO/ZCO NFs) by 4.35 times and pure ZnO by 12.7 times. The selectivity of 58.8% is 2.38 and 4.49 times higher than those of ZnO/ZnCo2O4 NFs and ZnO, respectively. These enhancements are attributed to efficient carrier separation facilitated by the ordered internal electric field of the Z-scheme heterojunction interface, validated by the energy band evaluations from experimentation and density functional theory (DFT) simulations and charge separation characterizations of photocurrent, impedance, and photoluminescence spectra. The Janus structure also effectively exposes the surface of ZnCo2O4 to CO2 molecules, increasing the active site availability, as confirmed by BET nitrogen adsorption/desorption, temperature-programmed desorption tests, and DFT adsorption energy calculations. This study proposes a novel approach for efficient photocatalytic hydrocarbon fuel production, with potential applications in energy and climate crisis mitigation.
研究领域:
材料科学
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环境科学
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化学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Fengdong Qu,Tiju Thomas,Bingxue Zhang,Xinxin Zhou,Shendan Zhang,Shengping Ruan,Minghui Yang
Hollow nanostructures derived from metal-organic frameworks have attracted considerable interest for prospective applications in gas separation/storage, drug delivery, catalysis device and gas sensors. Herein, porous hollow nanostructures, namely Co 3 O 4 /ZnCo 2 O 4 composite hollow nanostructures, are prepared through a self-sacrificing template method. The method includes the synthesis of zeolite imidazolate frameworks-67 self-sacrificing template and then transformation into Co/Zn-ZIF@Co-Zn layered double hydroxides precursor. Finally, the Co 3 O 4 /ZnCo 2 O 4 composite hollow nanostructures are obtained through thermal annealing of Co/Zn-ZIF@Co-Zn LDH precursor in air. The gas sensing investigations revealed that the Co 3 O 4 /ZnCo 2 O 4 composite hollow nanostructures-based gas sensor exhibited high response (16.3–100 ppm) and selectivity towards acetone. Besides, enhanced gas sensing properties of Co 3 O 4 /ZnCo 2 O 4 composite hollow nanostructures are observed when compared with Co 3 O 4 and ZnCo 2 O 4 hollow nanostructures. The excellent gas sensing characteristics of Co 3 O 4 /ZnCo 2 O 4 composite hollow nanostructures might be attributed to their high porosity, large specific surface area, and heterostructure between Co 3 O 4 and ZnCo 2 O 4 .
研究领域:
材料科学
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纳米技术
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气体传感
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功能材料
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化学传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Xiumei Chen,Na Xin,Yuxin Li,Cong Sun,Longhua Li,Yulong Ying,Weidong Shi,Yu Liu
The energy storage device has been urgently studied and developed to meet the increasing demand for energy and sustainable development. Due to the excellent conductivity of graphene and high performance of ZnCo 2 O 4 and NiCo 2 O 4 , we design a self-supporting electrode based on vertically grown two-dimensional/two-dimensional (2D/2D) NiCo 2 O 4 /ZnCo 2 O 4 hierarchical flakes on the carbon-based conductive substrate (NiCo 2 O 4 /ZnCo 2 O 4 @graphene/carbon nanotubes, NZ@GC). The density functional theory calculations indicate that the high OH − adsorption capacity of the NiCo 2 O 4 /ZnCo 2 O 4 nanosheets can significantly enhance the electrochemical reaction activity. NZ@GC shows a high capacitance of 1128.6 F g −1 at 1 A g −1 . The capacitance retains 84.0% after 6000 cycles even at 10 A g −1 . A hybrid supercapacitor is fabricated using NZ@GC and activated carbon, exhibiting a large energy density of 50.8 W h kg −1 at the power density of 800 W kg −1 . After 9000 charge/discharge cycles, the supercapacitor still has 86.1% capacitance retention. The NZ@GC film has showed the potential as promising electrodes in high efficiency electrochemical energy storage devices.
研究领域:
材料科学
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能源存储
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电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2019
·Vol. 9
·期 56
·32889-32897
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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.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2020
·
IF 2.906
Yujing Yang,Cui Yang,Kai Tao,Qingxiang Ma,Lei Han
Ternary metal oxide , such as ZnCo 2 O 4 has attracted widespread attention as electrode material for supercapacitors owing to its high theoretical activity and rich redox reactions arising from the synergistic effects between two different metal species. However, the compromised electrochemical performance due to low electronic conductivity and deficient active sites of ZnCo 2 O 4 impedes its practical applications. Herein, S-doped ZnCo 2 O 4 microspindles (denoted as S-ZnCo 2 O 4 ) have been obtained by simple hydrothermal synthesis followed by calcining and sulfurization treatments. It is indicated that the doping of S results in the formation of defects and disorders without altering the crystalline structure of ZnCo 2 O 4 , which is beneficial for charge transfer, and exposing more active sites. Taking advantage of the desired structure and composition, the S-ZnCo 2 O 4 displays superior electrochemical properties when acting as an electrode material for supercapacitors. It delivers a high specific capacity of 214.1C g −1 (522 F/g) at the current density of 0.5 A g −1 , which is almost 8.5 times that of the ZnCo 2 O 4 (25 C g −1 , 61 F/g). Moreover, the S-ZnCo 2 O 4 also shows good rate capability (82% at 10 A g −1 ) and excellent electrochemical stability (78% retention after 5000 cycles). This work demonstrates that anion doping can be an efficacious strategy of boosting electrochemical performance.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 32
·2001526
·
IF 11.459
Li Li,Zhengjun Xie,Gaoxue Jiang,Yijing Wang,Bingqiang Cao,Changzhou Yuan
Recently, binary ZnCo 2 O 4 has drawn enormous attention for lithium-ion batteries (LIBs) as attractive anode owing to its large theoretical capacity and good environmental benignity. However, the modest electrical conductivity and serious volumetric effect/particle agglomeration over cycling hinder its extensive applications. To address the concerns, herein, a rapid laser-irradiation methodology is firstly devised toward efficient synthesis of oxygen-vacancy abundant nano-ZnCo 2 O 4 /porous reduced graphene oxide (rGO) hybrids as anodes for LIBs. The synergistic contributions from nano-dimensional ZnCo 2 O 4 with rich oxygen vacancies and flexible rGO guarantee abundant active sites, fast electron/ion transport, and robust structural stability, and inhibit the agglomeration of nanoscale ZnCo 2 O 4 , favoring for superb electrochemical lithium-storage performance. More encouragingly, the optimal L-ZCO@rGO-30 anode exhibits a large reversible capacity of ≈1053 mAh g −1 at 0.05 A g −1 , excellent cycling stability (≈746 mAh g −1 at 1.0 A g −1 after 250 cycles), and preeminent rate capability (≈686 mAh g −1 at 3.2 A g −1 ). Further kinetic analysis corroborates that the capacitive-controlled process dominates the involved electrochemical reactions of hybrid anodes. More significantly, this rational design holds the promise of being extended for smart fabrication of other oxygen-vacancy abundant metal oxide/porous rGO hybrids toward advanced LIBs and beyond.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Yang Li,Yanxin Chu,Yuanfang Li,Cheng Ma,Lingling Li
The detection of specific DNA sequences provides a powerful tool for early diagnosis and prevention of disease. Herein, an enzyme-free electrochemiluminescence (ECL) DNA biosensor was developed by coupling inorganic-organic nanocomposite as the luminophore and ZnCo 2 O 4 as the efficient accelerator. ZnCo 2 O 4 nanoparticles (ZCO NPs), derived from Co and Zn based bimetallic zeolite imidazole framework, was used as the ECL substrate due to their large surface area and excellent catalytic effect. AgInS 2 -ZnS quantum dots (ZAIS) were covalently linked with meso -tetra(4-carboxyphenyl)-porphine (TCPP) to form ZAIS/TCPP inorganic-organic nanocomposites, which were used for the first time as the cathodic ECL luminophore with the coreactant of K 2 S 2 O 8 . Detection of target DNA (tDNA) about chronic myeloid leukemia (CML) was achieved based on dual-signal amplification via cascade toehold-mediated strand displacement reaction (TMSDR). On the basis of experimental results, a limit of detection (LOD) of 200 aM was achieved in the range of 0.5 fM to 1 nM, which showed the excellent performance of this biosensor. This work not only indicates that inorganic-organic nanocomposites as the ECL luminophore is a feasible strategy for efficient emission, but also expands the application of nanomaterials derived from metal organic frameworks.
研究领域:
生物化学
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纳米技术
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分析化学
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分子生物学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 43
·4330-4337
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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.
研究领域:
电化学
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纳米材料
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分析化学
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生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2024
·Vol. 171
·期 8
·083508
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IF 3.1
Xuan Dinh Ngo,Ngoc Huyen Nguyen,Thi Lan Huong Phung,Tuan Anh Nguyen,Nguyen Thanh Vinh,Quy Nguyen Van,Vinh Hoang Tran,Nhung Pham Tuyet,Anh-Tuan Le
In this study, we describe experimental efforts to decipher the role of ZnCo2O4 nanoflakes (ZCO-NFs) for selective enhancement of voltammetric responses of screen-printed electrode (SPE) toward redox species system. The ZCO-NFs sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and UV–vis spectroscopy. The electrochemical characterization of bare SPE and modified SPE electrodes was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott−Schottky analysis. A series of redox systems including paracetamol (PA), dopamine (DA), chloramphenicol (CAP), furazolidone (FZD), p-nitrophenol (p-NP), carbaryl (CBR), ofloxacin (OXF), and erythromycin (ERY) were selected to investigate for (i) reversible redox process, (ii) irreversible electrochemical oxidation process, and (iii) irreversible electrochemical reduction process on both bare-SPE and ZCO-NFs/SPE electrodes. The obtained results showed that ZCO-NFs possess the selective enhancement of electrochemical response for redox systems with an increase of 24%–90% for PAR, DA, FZD, CAP, and CBR and a decrease of 13%–49% for p-NP, ERY, and OFX. The different electrochemical response of redox species at nanostructured semiconductor electrodes is attributed to the contribution of both the adsorption capacity of redox species and the interfacial electron transfer process between electrode and redox species. An insight into the interfacial electron transfer kinetics and its contribution to the enhancement of electrochemical response on p-type semiconductor electrode is helpful in designing high-performance sensing platforms based on spinel oxide nanostructures.
研究领域:
材料科学
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分析化学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2013
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IF 2.39
Xiong Song,Qiang Ru,Beibei Zhang,Shejun Hu,Bonan An
A novel flake-by-flake ZnCo 2 O 4 (ZCO) with porous nanostructure is prepared by a typical and facile co-precipitation method using oxalic acid as complex agent. XRD, SEM, and TEM analyses show the as-prepared ZCO nanoparticles have a high purity and a good crystallinity, and the ZCO nanoflakes with a thickness of 30–80 nm are composed of uniform ZCO nanocrystals with a diameter of 20–40 nm. The novel structure with enough free space is beneficial to improving the electrochemical performance. The as-prepared ZCO used as an anode material for lithium-ion batteries exhibits a high specific capacity of 1275 mA h/g at a current rate of 100 mA/g after 50 cycles, as well as a high power capability at elevated current rates, i.e., 1130 and 730 mA h/g at current rates of 500 and 3000 mA/g, respectively. It has a great prospect for the application of anode materials for lithium-ion batteries.
研究领域:
材料科学
·
电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chang Chen,Kwok-ho Lam,Bao-jun Liu,Xian-hua Hou,Yu-ping Wu
Chemically integrated hybrid quantum dots ZnCo 2 O 4 /reduced graphene oxide (QDs ZCO/rGO) sheets nanocomposites are synthesized through polyol processes. rGO sheets grow and interweave to form basic skeletons. Ultrafine ZCO particles with a size of around 3.66 nm grow and embed on both sides of the rGO sheets, and the rGO sheets restrain the reunion of ZCO nanoparticles . The existence of rGO sheets and ZCO nanoparticles can engender the mutual synergistic effects so that hybrid QDs ZCO/rGO electrodes exhibit the excellent electrochemical properties . Owing to this special nanoparticles-on-sheets structure, the hybrid QDs ZCO/rGO electrodes exhibit an excellent initial discharge capacity for rechargeable lithium-ion batteries (1325.9 mAh g −1 at the current density of 200 mA g −1 ), high rate stability (532.3/566.1 mAh g −1 at 4000 mA g −1 ) and outstanding electrochemical cyclic stability (657.6/668.2 mAh g −1 at 2000 mA g −1 after 2000 cycles with a capacity retention of 68.6%). For full-cells, high initial reversible discharging capacity (646 mAh g −1 at 200 mA g −1 ) and good cyclic stability (514 mAh g −1 at 200 mA g −1 after 100 cycles) are obtained. The superior performance of the as-prepared electrodes is ascribed to the advantage of nano-sized particles. With the successful synthesis of hybrid QDs ZCO/rGO nanocomposites, the facile synthetic route and unique growth of nanostructuring method can be extended to high electrochemical performance electrodes for commercial lithium-ion batteries.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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功能材料
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先进电池技术
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料化学
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光催化
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能源科学
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纳米材料
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可持续能源
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）