APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaoyu Zhang,Xuan Wang,Ying Cao,Chengyang Liang,Shitong Geng,Haipeng Guo,Ying Liu,Yanhong Luo,Wenming Zhang,Ling Li
A porous coating structure transition metal oxide ZnCo 2 O 4 @NiMoO 4 composite was successfully synthesized on the surface of carbon paper (CP) by a simple two-step hydrothermal method as a Pt-free material for titanium mesh substrate counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). According to BET test results, the material has a high specific surface area, which can provide abundant active sites for the redox reaction of electrolytes to enhance the utilization rate of sunlight by DSSCs, and the composite materials show remarkable electrocatalytic performance in reducing iodine electrolytes and improving the photoelectric conversion efficiency (PCE) of DSSCs. Therefore, the DSSCs equipped with ZnCo 2 O 4 @NiMoO 4 /CP material CEs achieve a PCE of 9.30 % (with J sc of 20.51 mA·cm −2 , V oc of 0.763 V, and FF is 0.60), which is much higher than that of Pt CEs (7.36 %) under the same light conditions. This is due to the excellent catalytic ability and good electrical conductivity of the composite material. On the other hand, because the titanium mesh can increase the contact area between the electrode material and the substrate compared with the FTO substrate, and the titanium mesh has good electrical conductivity, it can enhance the diffusion ability of I - / I 3 - to accelerate electron transmission.
研究领域:
材料科学
·
电化学
·
太阳能
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Xuan Li,Li Liu,Xue Dong,Guanhui Zhao,Yueyuan Li,Juncong Miao,Jinglong Fang,Min Cui,Qin Wei,Wei Cao
A sensitive dual mode competitive electrochemical immunosensor for the detection of B-type natriuretic peptide (BNP) was successfully fabricated, which based on differential pulse voltammetry (DPV) and amperometric i-t curve response modes. Polyaniline (PAN) and tin dioxide (SnO 2 ) were loaded on graphene sheets (GS), which could effectively promote the electron transfer process, thereby amplifying the current signal and increasing the sensitivity of the immunosensor. To promote biocompatibility, gold nanoparticles (Au) were incorporated on GS/SnO 2 /PAN (GS/SnO 2 /PAN-Au). GS/SnO 2 /PAN-Au complex was gotten to act as the platform which could provide a clearly DPV signals. N-doped carbon nanotubes (N-CNTs) embellished by ZnCo 2 O 4 quantum dots (ZnCo 2 O 4 /N-CNTs) with excellent catalytic properties for the reduction of H 2 O 2 was gotten to act as the label of the antibody-BNP (Ab), providing an obviously current signal through amperometric i-t curve method. A large quantity of BNP could be stable loaded in the modified electrode via GS/SnO 2 /PAN-Au with excellent electrical conductivity and good biocompatibility , which could compete with target-BNP to combine Ab that labelled by ZnCo 2 O 4 /N-CNTs. Under the optimum conditions, the immunosensor exhibited remarkable analytical performance of a linear range from 0.01 pg/mL to 1 ng/mL with a detection limit of 3.4 fg/mL for quantitative detection of BNP (S/N = 3). This method was able to become a universal strategy for other biological detection.
研究领域:
电化学
·
生物化学
·
纳米技术
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2021
·Vol. 15
·期 4
·e202102049
·
IF 8.928
Pingping Huang,Tingting Fan,Xintao Ma,Jiguang Zhang,Yanping Zhang,Zhou Chen,Xiaodong Yi
Graphical Lowering barriers : Bimetallic ZnCo 2 O 4 catalyst can promote nitrate electroreduction at room temperature. The electron-deficient Co active site can lower the energy barriers for the formation of *NO 2 intermediate and suppress the hydrogen evolution reaction, thus enhancing the selectivity and yield rate of electrochemical NO 3 − reduction to ammonia. Nitrate (NO 3 − ) as a common pollutant of groundwater causes drinking water safety problems and seriously endangers people‘s health. Electrochemical reduction of nitrate to ammonia under ambient condition is a green and significant route to reduce the concentration of NO 3 − and produce ammonia (NH 3 ), known as a complement to the Haber–Bosch reaction. Currently, noble-metal electrocatalysts are often used in electrochemical reduction of NO 3 − , but high cost and scarcity limited their application. Herein, three-dimensional (3D) flower-like zinc cobaltite (ZnCo 2 O 4 ) electrocatalyst was developed to convert nitrate into ammonia at room temperature. The NH 3 yield rate could reach up to around 2100 μg mg −1 h −1 at a potential of −0.6 V vs. reversible hydrogen electrode (RHE), which was around 2.0 times higher than that of pristine Co 3 O 4 . In addition, the NH 3 faradaic efficiency of ZnCo 2 O 4 electrocatalyst could reach around 95.4 % at potential of −0.4 V vs. RHE with good structural and morphological stability, which surpassed most reported non-noble metal-based electrocatalysts. Further studies concluded that the improved activity of electrocatalytic NO 3 − reduction was ascribed to the existence of abundant active sites and the charge transfer from Co atoms to Zn atoms after Zn doping. Importantly, this work opens a new path for the development of Co-based materials as electrocatalysts for reducing nitrate to ammonia.
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1174-1185
·
IF 3.925
Xinyu Liu,Jing Xu,Jiandong Wu,Zhenlu Liu,Shengming Xu
In the process of photocatalysis, semiconductor materials generate photogenerated electrons and photogenerated holes when excited by sunlight, so as to participate in the process of photocatalytic decomposition of water to produce hydrogen. In this work, under the combined action of ultrasonic and electrostatic forces, two semiconductors are successfully coupled through electrostatic self-assembly to effectively avoid the serious phenomenon of sulfide photocorrosion. Through electrochemical and fluorescence characterization experiments, it is confirmed that ZnCo2O4/CdS can accelerate the generation and transmission rates of photogenerated carriers. ZnCo2O4/CdS greatly increased the activity of the catalyst under simulated sunlight irradiation. With good photocatalytic activity, the hydrogen yield reached 80.71 mmol g−1 within 5 hours, far superior to those of Co3O4/CdS and ZnO/CdS. The relative values of the work functions of ZnCo2O4(311) and CdS(110) were calculated by DFT. Combined with the position of the conduction band, it was concluded that a new S-scheme induced by an internal electric field was formed at the ZCO/CS-25% contact interface, thus improving the photocatalytic activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 11
·2100125
·
IF 6.147
Wei Si,Haibo Li
In this work, the spinel ZnCo 2 O 4 (ZCO) prepared by a simple strategy is employed for capacitive deionization (CDI) towards enhanced desalination performance. The ZCO reveals typical spherical structure that is beneficial in providing 3D tunnels for ions diffusion. On the basis of electrochemical measurements, the ZCO electrode possesses specific capacitance of 307.9 F g −1 in 1 m NaCl solution at the scan rate of 1 mV s −1 . Remarkably, the equivalent series resistance and the Warburg impedance of ZCO electrode is only 0.54 and 0.66 Ω, respectively. Such low resistivity is conducive to improve the efficiency of charge transfer and the driven energy utilization. Regarding the desalination, the ZCO electrode illuminates the salt removal capacity of 39.4 mg g −1 in 2000 µS cm −1 NaCl solution at 1.2 V. Under the same experimental conditions, the ZCO electrode demonstrates a high desalination capacity of 73.39 mg g −1 with charge efficiency of 76.8% at a constant current of 10 mA g −1 . Moreover, the preferential removal of Na + , K + , and Mg 2+ enabled by ZCO electrode is investigated, suggesting the radius of hydration ions plays a significant role. Beyond that, the analysis on the morphology, crystal phase, and valance state of ZCO electrode at different desalination/salination state are explored to propose the possible desalination mechanism.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2025
·
IF 9.3
Ramzi Nasser,Habib Elhouichet,Zhou Li,Ji-Ming Song
Engineering nanocomposites based on transition metal oxides (TMOs) shows an extensive interest due to their synergistic effects and strong interfacial interactions. In this report, a novel ZnFe 2 O 4 @ZnCo 2 O 4 nanocomposite is bridged on Ni-Foam through one pot-hydrothermal way. The nanocomposite exhibits synergistic properties due to the build of a Mott-Schottky heterojunction, which enhances interfacial interactions, provides pathways for ion migration and diffusion, and enables rapid charge transfer, thereby improving energy storage dynamics. In full 3 electrode system, the ZnFe 2 O 4 @ZnCo 2 O 4 electrode delivers extraordinary specific capacity of 913.7 C·g −1 (0.5 A·g −1 ), keeps marvellous capacitance retention of 79 % at 30 A·g −1 , and a long cycle life with only 7 % capacity loss after 20,000 rounds. More encouragingly, an asymmetric supercapacitor device of ZnFe 2 O 4 @ZnCo 2 O 4 //active carbon (AC) delivers an impressive energy density of 73.77 Wh·kg −1 at 490 W·kg −1 power value. Two devices in series can successfully operate a white LED for several minutes. The foldability characteristic of the device shows good electrochemical properties even at various bending angles. Therefore, the new ZnFe 2 O 4 @ZnCo 2 O 4 nanocomposite endorsed by Mott-Schottky junction, effectively addressed the charge states at the interface and ensured the specificity of electrode material, leading to superior electrochemical performance.
研究领域:
材料科学
·
电化学
·
能量存储与转换
·
纳米材料
·
过渡金属氧化物
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12026-12040
·
IF 2.22
Mao Min,Xu Jing,Li Jingjiao,Zhao Sheng,Li Xuanhao
It was the constant pursuit of researchers to explore catalysts with higher catalytic activity, and the use of co-catalysts to modify the performance of photocatalytic materials had a significant effect on charge separation. In this paper, the non-precious metal NiS-modified ZnCo 2 O 4 composite catalytic material prepared by hydrothermal method had high-efficiency catalytic performance. When the weight ratio of NiS to ZnCo 2 O 4 was 12%, the optimal catalytic activity is 3.57 mmol g −1 h −1 , which was more than twice that of ZnCo 2 O 4 . The presence of NiS not only improved the specific surface area of the catalyst and its ability to respond to light, but the close interface formed by the combination of the two monomer phases accelerated the transfer and the utilization of the photocharge on ZnCo 2 O 4 to NiS, thereby promoting the separation of electron holes and improving the photocatalytic activity of the catalyst. According to the research results, the mechanism of hydrogen production in the photocatalytic system was revealed. In this paper, NiS was used to modify the bimetallic oxide with cubic appearance, which provided a new strategy for the development of new photocatalysts.
研究领域:
材料科学
·
物理化学
·
纳米催化
·
能源化学
·
半导体光催化
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qi Feng,Yanbing Sun,Huimin He,Jing Zhao,Fanyuan Meng,FuXing Wang,Dezhou Zheng,Guangxia Wang,Fuqin Deng,Ningbo Yi,Bingjun Jin
Exploring cost-effective and high-performance electrocatalysts for oxygen evolution reaction (OER) is quite significant for utilizing renewable energies by converting them to green hydrogen energy. ZnCo 2 O 4 spinel oxide has drawn a wide attention in water electrolysis field owing to its earth abundance, low cost and eminent electrocatalytic activity. However, it still has a great room to boost its OER catalytic activity due to the low electrical conductivity and restricted active sites of ZnCo 2 O 4 catalyst. Herein, a facile, easy-scalable and environmental-friendly quenching method is exhibited to achieve surface Fe doped and oxygen vacancy generated ZnCo 2 O 4 by instantaneous cooling in Fe(NO 3 ) 3 solution. As a result, the quenched ZnCo 2 O 4 catalyst shows a vastly improved OER activity in alkaline electrolyte, only requiring an overpotential of 332 mV to reach 10 mA cm −2 , which is much lower than that of un-quenched ZnCo 2 O 4 (405 mV). Our results manifest that quenching treatment can endow an active Fe amorphous layer, a higher ratio of Co 3+ states and more abundance oxygen vacancies for ZnCo 2 O 4 spinel oxide, thus possessing a higher OER activity. Our work offers an effective path for the regulation of metal oxides and its application in energy catalysis field.
研究领域:
材料科学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 16
·967
·
IF 2.8
Zhang Qi,Wang Qing,Dai Jianfeng
ZnCo 2 O 4 is considered a highly promising anode material for lithium-ion batteries (LIBs), attributed to its impressive capacity and excellent electrochemical characteristics. However, its practical application is constrained by significant volume expansion during repeated charge–discharge cycles, leading to structural instability and performance degradation over time. To address this challenge, a composite material consisting of reduced graphene oxide (rGO) coating the exterior of ZnCo 2 O 4 microspheres (denoted as ZCO@r-3) was designed and synthesized in this study, making it an anode material with high cycling stability for LIBs. This design aims to increase the structural stability and electrochemical properties through the effective incorporation of rGO, mitigating volume expansion during redox reactions when redox reactions occur. In this composite structure, rGO serves as a conductive network that significantly enhances ion diffusion, while its excellent mechanical properties help mitigate the volume expansion of ZnCo 2 O 4 during redox reactions. This dual action of rGO not only strengthens the structural stability of ZnCo 2 O 4 microspheres but also enhances their electrochemical performance, providing an effective and practical solution. As expected, the ZCO@r-3 composite exhibited an initial discharge capacity of 1582.1 mAh g −1 in the first cycle and initial reversible specific capacity of 1087.9 mAh g −1 after the second cycle at 0.1 A g −1 . Even after 500 charge/discharge cycles under the same conditions, the composites maintained a reversible capacity of 966.7 mAh g −1 . This demonstrates exceptional cycling stability, validating the effectiveness of the rGO coating in enhancing the material's long-term performance. This confirms that the method proposed in this study effectively addresses the volume expansion issue of ZnCo 2 O 4 .
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 25
·19241-19247
·
IF 3.84
Lingyun Guo,Qiang Ru,Xiong Song,Shejun Hu,Yudi Mo
Herein, we report mesoporous ZnCo2O4 microspheres fabricated by a facile hydrothermal method followed by pyrolysis of a Zn0.33Co0.67CO3 precursor. The obtained ZnCo2O4 microspheres were made up of closely packed primary nanoparticles with a diameter of about 30 nm and a large number of pores that were sized between 10 to 40 nm, which results in a high BET surface area of 39.52 m2 g−1. The large surface area permits a high interfacial contact area with the electrolyte and provides more locations and channels for fast Li+ insertion/extraction into the electrode material. The porous structure may not only be beneficial for Li+ ions to diffuse efficiently to active material with less resistance but also to buffer the volume expansion during the discharging/charging processes. When used as an anode material, the specific capacity was maintained at a high value of 1256 mA h g−1 after 100 cycles at a current density of 100 mA g−1, which is about 3.4 times larger than that of the commercial graphite electrode (372 mA h g−1). More interestingly, a reversible capacity as high as 774 mA h g−1 could be retained at a high current density of 1000 mA g−1 after 200 cycles, which indicates that the mesoporous ZnCo2O4 microspheres had excellent cycling performance at a high current density for use as anode materials for lithium-ion batteries (LIBs).
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
✓ 已验证
DOI
高影响因子
Processes
·
2020
·Vol. 8
·期 11
·1501
·
IF 2.753
Wenjia Zhao,Zhaoping Shi,Yongbing Qi,Jipeng Cheng
In this paper, ZnCo2O4nanowire arrays with a uniform carbon coating were introduced when polyvinyl alcohol (PVA) served as the carbon source. The coating process was completed by a facile bath method in PVA aqueous solution and subsequent pyrolyzation. The PVA-derived carbon-coated ZnCo2O4nanowire array composites can be used directly as the binder-free and self-supported anode materials for lithium-ion batteries. In the carbon-coated ZnCo2O4composites, the carbon layer carbonized from PVA can accelerate the electron transfer and accommodate the volume swing during the cycling process. The lithium storage properties of the carbon-coated ZnCo2O4composites are investigated. It is believed that the novel carbon-coating method is universal and can be applied to other nanoarray materials.Keywords:polyvinyl alcohol;carbon coating;nanoarray composites;lithium-ion batteries
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 44
·期 2
·977-987
·
IF 3.343
Chuan Ding,Weilong Xu,Min Wang,Xueqin Zeng,Wei Wang
Summary ZnCo 2 O 4 /C microhydrangeas with controllable microstructure are successfully synthesized through a simple citrate-guided solvothermal method and following thermal decomposition. The experimental results reveal that the citrate-directed self-regulation of Zn-Co-EG agglomerates play a critical role in the formation of the hydrangea-like precursors. When applied as anode material in lithium ion batteries (LIBs), ZnCo 2 O 4 /C microhydrangeas exhibited high available capacities of 964.6 mAh g −1 at 1 A g −1 after 200 cycles and 704.4 mAh g −1 at 4 A g −1 over 1000 cycles. The excellent reliability is attributed to the superior microstructure that provides many benefits including enhanced electron or ion transport and improved structure stability, etc.
研究领域:
材料科学
·
能源存储与转换
✓ 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）