JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ziyin Yang,Yaqi Kong,Chengcheng Qi
This study regulates the electrocatalytic activity of Co 3 O 4 nanomaterials based on quench-induced oxygen vacancies for boosting electrochemical sensing of glucose. Two different types of Co 3 O 4 nanomaterials were synthesized by the hydrothermal method and high-temperature calcination. It was found that quenching induced abundant oxygen vacancy defects on the surface of Co 3 O 4 nanomaterial. The presence of oxygen vacancy defects not only improves the conductivity of Co 3 O 4 nanomaterials, but also enhances the adsorption of OH - and facilitates the creation of abundant active sites. The enriched oxygen vacancies boost the electrocatalytic activity of Co 3 O 4 nanomaterials, enabling the sensor to detect glucose with an extremely high sensitivity of 1528.1 µA·mM −1 ·cm −2 . Furthermore, the sensor can be utilized for detecting glucose in energy drinks. This study explores the structure-activity relationship between oxygen vacancies and electrocatalytic activity, providing insights for the development of high-performance sensing materials through the oxygen vacancy regulation strategy.
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Qianwen Chen,Yanbing Huang,Wanshun Duan,Qijia Su,Yilong Wang,Fuxi Bao,Junjun Zhang,Wen Guo
The kinetics of the oxygen evolution reaction (OER) of Co3O4 in alkaline media can be promoted by a bimetallic co-doping strategy. Herein, we synthesize a Zn/Fe co-doped Co3O4 nanostructure (ZnFe-Co3O4) to enhance the oxygen evolution reaction performance in the alkaline media. The ZnFe-Co3O4 electrocatalyst exhibits a low overpotentials of 255 mV at 10 mA cm-2, a Tafel slope of 54 mV dec-1 in 1.0 M KOH and excellent long-term durability up to 120 hours at 100 mA cm−2. The X-ray photoelectron spectroscopy (XPS) reveals that Zn occupies octahedral Co3+ sites and Fe occupies tetrahedral Co2+ sites in the Co3O4 lattice. The experimental results together with theory calculations collectively demonstrate that ZnFe-Co3O4 follows the lattice oxygen mechanism (LOM) during OER process. In situ Raman spectroscopy shows that the truly reactive FeOOH/CoOOH species are formed through surface reconstruction during OER. Furthermore, it is found that the synergistic effects of Zn and Fe doping, which stabilize the Co3O4 structure and promote the generation of active (oxy)hydroxide species, are identified as key factors in the enhanced electrocatalytic performance. This work offers a novel concept for enhancing the electrocatalytic activity of electrocatalysts through doping strategies and provides guidance for the rational design of ideal electrocatalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Shasha He,Huirou Zhou,Hongjian Chen,Xinglin Qin,Rahim Rahimi,Hongjie Jiang
Nitrite is a common harmful ion found in water and food, and its excessive intake poses significant risks to human health. Accordingly, devising a detection strategy for nitrite that is fast, highly responsive, durable, and ecologically sustainable holds significant importance. In this study, a surface-modified Fe/Cu bimetal-doped Co 3 O 4 catalyst was successfully synthesized, and its 1 wt% aqueous dispersion was drop-cast onto carbon cloth (CC) to fabricate a binder-free flexible electrode (KH792@(C)Fe/Cu–Co 3 O 4 CC) for electrochemical sensing of nitrite. This electrode demonstrated remarkable electrocatalytic activity toward NO 2 − in phosphate buffer solution (0.1 M PBS, pH 7.4), offering a broad linear detection range (6.65 μM–5.0 mM), an exceptionally rapid response time (0.1 s), as well as a low detection limit of 6.65 μM, demonstrating both its high sensitivity and practical applicability. This enhanced performance is largely credited to the cooperative effect between KH792 functional organic units and the Fe/Cu–Co 3 O 4 composite oxide framework. On one hand, the introduction of organic molecules enhances the electrode's electron transfer capability and surface hydrophilicity. On the other hand, the dual-metal doping induces a high density of surface defects and oxygen vacancies, enhancing the density of active sites and facilitating both the adsorption and electron transport processes of nitrite. Moreover, the catalyst was successfully applied to commercial disposable screen-printed electrodes, which were compatible with portable electrochemical workstations, underscoring its potential for low-cost and on-site nitrite detection.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Zufeng Qiu,Kexin Yang,Zijian Huang,Hongsheng Zhao,Zhiwei Lin,Qin Kuang,Zhaoxiong Xie
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has emerged as a superior technique for detecting small molecules, owing to the strategic utilization of inorganic nanomaterial matrices. Despite the impressive capabilities of various novel matrices, the underlying interaction mechanisms between inorganic matrices and analytes remain largely unexplored. In this study, we synthesized Co 3 O 4 nanocubes, Co(OH) 2 nanosheets, Co 3 O 4 /Co(OH) 2 heterojunctions, and Co 3 O 4 +Co(OH) 2 composites via a facile one-pot method. Amino acids were selected as model analytes for performance evaluation. Notably, the Co 3 O 4 /Co(OH) 2 heterojunctions significantly enhanced signal intensity and lowered detection limits to the parts-per-billion (ppb) level, outperforming Co 3 O 4 nanocubes, Co(OH) 2 nanosheets, and Co 3 O 4 +Co(OH) 2 composites. The detection results for environmental pollutants, especially in solutions containing real samples, highlight the outstanding performance of the heterojunction material as a matrix. Further characterization indicates that the formation of the heterojunction enhances nanoparticle dispersion and promotes the separation of photogenerated electron-hole pairs. Consequently, more photogenerated charge carriers can be transferred to the target analytes, facilitating their charging ability and ultimately enhancing signal intensity in MALDI-TOF MS. These results clearly demonstrate that the enhanced photocatalytic performance directly drives the improvement of MALDI-TOF MS performance, excluding interference from other factors. Thus, this study successfully combines photocatalytic mechanisms with MALDI-TOF MS mechanisms, providing new insights into the enhancement of MALDI-TOF MS performance. Additionally, it offers a new detection method for environmental pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Jin Zhang,Mengting Gao,Pengqi Zhu,Yunwei Wang,Ruiyi Wang,Zhanfeng Zheng
The design of efficient photocatalyst for selective hydrogenation of α,β -unsaturated aldehydes to unsaturated alcohols is changeling. In this study, oxygen vacancy enriched MgAl-layered double hydroxide (MgAl-LDH) supported Co 3 O 4 nanoparticle photocatalysts are developed taking the advantage of the semi-memory effect of CoMgAl-LDH. Excellent photocatalytic performance was achieved with a 99 % cinnamaldehyde conversion and 98 % cinnamyl alcohol selectivity at 100 °C under visible light irradiation. The electron enriched Co 3 O 4 nanoparticles facilitated the activation of isopropanol to provide active H species under light irradiation. In situ DRIFTS and DFT calculation results suggest the oxygen vacancies of MgAl-LDH were beneficial to the terminal O adsorption of –C O group in cinnamaldehyde and ensure the high selectivity of cinnamyl alcohol. This study demonstrated a novel synthesis strategy of Co 3 O 4 nano-photocatalyst for the efficient selective hydrogenation under visible light irradiation.
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Jinhao Gao,Wenqiang Chen,Huaqiang Shi,Zhijian Li,Liming Jing,Chen Hou,Jianzhi Wang,Yang Wang
Co 3 O 4 @Fe 3 O 4 /cellulose membrane was synthesized by coating rod-like MOF-derived Fe 3 O 4 with Co 3 O 4 nanoparticles and blending with cellulose solution, further applied in the visible light-driven photo-Fenton system for perfluorooctanoic acid (PFOA) degradation. In the H 2 O 2 /membrane/visible light system, the Electron paramagnetic resonance (EPR) analysis and scavenger experiment results suggested that PFOA degradation was a co-dependent mechanism via photogenerated electrons, photogenerated holes ( h + ) and various radical species, rather than a single active constituent. Co 3 O 4 @Fe 3 O 4 /cellulose membrane showed outstanding degradation performance, stability and recyclability under optimal conditions. Compared with pure Fe 3 O 4 or Co 3 O 4 nanoparticles , the Co 3 O 4 @Fe 3 O 4 /cellulose membrane can degrade around 94.5% PFOA within 180 min in reaction system, and the leached Fe and Co was only 0.05 and 0.49 ppm, respectively. Moreover, Co 3 O 4 @Fe 3 O 4 /cellulose was reused by rinsing with ultra-pure water and the degradation capacity was still 80.4% after five cycles. The degradation pathway of PFOA also was proposed based on UHPLC-MS analysis.
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Junjun Lv,Linmeng Wang,Rushuo Li,Kaiyue Zhang,Danfeng Zhao,Yaqiong Li,Xiangjun Li,Xiubing Huang,Ge Wang
The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property of the oxygen evolution reaction (OER). Herein, we synthesize a kind of nickel foam (NF)-supported electrocatalyst composed of a one-dimensional Co3O4 nanowire as the core and a two-dimensional NiFe-LDH nanosheet as the shell (denoted as NiFe-60/Co3O4@NF). Fluorine is introduced into the precursor Co(OH)F of Co3O4, which results in improved thermal stability and significantly increased regularly distributed oxygen vacancies, while the electrochemically deposited NiFe-LDH nanosheets possess a crystalline/amorphous hybrid structure. As a result, the hetero-interface mainly constituting Ni species from NiFe-LDH and Co3O4 from Co(OH)F contributes to the interaction between Co and Fe species and facilitates the electron transfer. Simultaneously, the interaction between oxygen vacancies in Co3O4 and coordinatively unsaturated Fe species in the amorphous area in NiFe-LDH is also determined, finally completing the electron backtracking. Benefiting from these factors, only low overpotentials of 221 and 257 mV are required to deliver the current densities of 100 and 500 mA cm–2, respectively, with a quite small Tafel slope of 34.6 mV dec–1 during OER for the well-designed NiFe-60/Co3O4@NF electrocatalyst.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Kuan Wu,Bijiang Geng,Chen Zhang,Wenwen Shen,Dewen Yang,Zhen Li,Zuobao Yang,Dengyu Pan
The rate capability of an anode material is limited by slow Li-ion diffusion dynamics within the bulk, which leads to slow charging rates and low power densities in Li-ion batteries. To address this issue, we fabricated novel 3D hierarchical porous oxide arrays composed of mesoporous Co 3 O 4 nanosheets grown on a thin layer of reduced graphene oxide “skin” as a stable buffering and conducting layer. The porous oxide-graphene hybrid anode shows the outstanding rate capability (∼1400 mAh g −1 at 2.0 A g −1 ) among all oxide anode materials, high cycling stability and high retention of 84.5% over 200 cycles. Besides, the anode material in sodium-ion batteries also delivers a high capacity of 757 mAh g −1 and a high retention of 89.7% over 400 cycles. The high electrochemical performances are mainly due to mesoporous Co 3 O 4 nanosheets provide abundant accessible sites for electrolyte diffusion and intercalation of Li + /Na + ions into the active phases while the graphene coating dramatically boosts the overall Li/Na storage performances of the Co 3 O 4 nanosheets by enhancing the binding to and electrical contact with the current collector. Kinetic analysis reveals that the rational integration of battery-type and capacitor-type electrochemical energy storage in the same anode material (the distinct 3D hierarchical porous structure) enables to offer excellent rate capability. This novel graphene-metal oxide nanopore array could be applied in high-performance Li-ion and Na-ion batteries.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 36
·18907-18915
·
IF 14.511
Xuefan Zheng,Yuqi Wu,Cheng Li,Jinxue Peng,Wu Yang,Zhongwei Lv,Haoyue Zhong,Zhengliang Gong,Yong Yang
All-solid-state lithium–sulfur batteries (ASSLSBs) are promising candidates for the development of next-generation batteries with high energy density and improved safety. Nevertheless, the sluggish reaction kinetics of the S and Li2S cathode and the low active material content hinder the further development of ASSLSBs. Herein, a Co3O4@nitrogen-doped carbon (Co3O4@NC) nanocomposite is used as an electronically conductive additive to promote the conversion kinetics of S and Li2S in the solid sulfur cathode. With a high sulfur content of 50 wt% and sulfur loading of 4 mg cm−2, ASSLSBs with the S–Co3O4@NC–Li7P3S11 (S–CoNC–LPS) composite cathode exhibit a high specific capacity of 1313 mA h g−1 at 0.2 mA cm−2, as well as a reversible capacity of 1167 mA h g−1 after 100 charge/discharge cycles. Furthermore, the S–CoNC–LPS cathode also demonstrates a high areal capacity of 16.12 mA h cm−2, corresponding to a reversible capacity of 1343 mA h g−1, and good cycling stability even with an ultra-high sulfur loading of 12 mg cm−2. Such a superior electrochemical performance can be attributed to the fact that Co3O4@NC lowers the reaction energy barrier and promotes the interconversion of S and Li2S.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yueyue Ma,Xiaoyu Chen,Pin Cao,Yingying Wang,Fan Li,Ling Li,Wenming Zhang
Metal-organic frameworks (MOFs) have drawn numerous attention as precursors to fabricate porous materials owing to their inherent highly controllable composition and tunable porosities. Nevertheless, the construction of an efficient and low cost anode material derived from zeolitic imidazole framework-67 (ZIF-67) to pursue enhance rate capability and specific capacity remains attractive and challenging. Herein, the fabrication of the Co 3 O 4 -based hierarchical carbon fiber composites with the ZIF-67/Co 2+ ions derivatives embedded (Co 3 O 4 @CNF) by a facile electrospinning technique and a two-step annealing is reported. When evaluate as a binder-free anode for SIBs , the resultant electrode delivers a superior sodium-ion storage capacity of 380 mAh g −1 after 150 cycles at 100 mA g −1 , a remarkable rate performance and an outstanding long-cycling stability of 129 mAh g −1 after 500 cycles at 3.2 A g −1 , which is better than other MOFs-derived free-standing anode materials for SIBs reported previously. The 1D carbon fibers can serve as a buffer framework to ensure the structural stability . In addition, the conductive matrix formed by the interleaving of carbon fibers can facilitate electronic transport along their 1D geometry. Furthermore, the dispersed ZIF-67/Co 2+ ions derivatives in fibers provide the composite with high surface exposure to the electrolyte, which is conducive to chemical reactions.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Yinchao Zhao,Chenguang Liu,Ruowei Yi,Ziqian Li,Yanbing Chen,Yinqing Li,Ivona Mitrovic,Stephen Taylor,Paul Chalker,Li Yang,Cezhou Zhao
There is considerable scientific interest in the newly available family of MXenes material. An analog as graphene, this two-dimensional (2D) layered material with the structure of transition metal carbides or nitrides exhibits superior electronic conductivity , large interlayer spacing for highly efficient lithium ions diffusion pathways and environmental benignity, making it useful as energy storage material . However, the inferior capability to store lithium ions impedes its wide application in lithium-ion batteries. Therefore, a facile strategy for preparing Co 3 O 4 nanoparticles incorporated with MXene nanosheets on Ni foams has been developed. Small-size Co 3 O 4 nanoparticles are uniformly distributed within the MXene nanosheets leading to the highly efficient lithium ions and electrons transmission, as well as the prevention for the restacking of MXene nanosheets and huge volume change of the Co 3 O 4 nanoparticles . Under the cooperative effect of Co 3 O 4 nanoparticles and MXene nanosheets , the Co 3 O 4 /MXene composite electrode with the mass ratio of Co 3 O 4 /MXene = 1:1 exhibits an excellent reversible capacity of 1005 mAh g −1 after 300 cycles at the current density of 1 C, which significantly exceeds that of pristine Co 3 O 4 electrode. Though the current density climbs to 5 C, the composite electrode remains a stable capacity of 307 mAh g −1 after 1000 cycles. It is demonstrated that Co 3 O 4 /MXene composite electrode has the potential as an anode for the high-performance lithium-ion batteries.
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 25
·255501
·
IF 3.551
Huapeng Wang,Mingpeng Chen,Qian Rong,Yumin Zhang,Jicu Hu,Dongming Zhang,Shiqiang Zhou,Xinbo Zhao,Jin Zhang,Zhongqi Zhu,Qingju Liu
Xylene is a volatile organic compound which is harmful to the human health and requires precise detection. The detection of xylene by an oxide semiconductor gas sensor is an important research direction. In this work, Co3O4 decorated flower-like SnO2 nanorods (SnO2/Co3O4 NRs) were synthesized by a simple and effective two-step method. The SnO2/Co3O4 NRs show high xylene response (Rg/Ra = 47.8 for 100 ppm) and selectivity at the operating temperature of 280 °C, and exhibit high stability in continuous testing. The resulting SnO2/Co3O4 NRs nanocomposites show superior sensing performance towards xylene in comparison with pure SnO2 nanorods. The remarkable enhancement in the gas-sensing properties of SnO2/Co3O4 NRs are attributed to larger specific surface area and the formation of p–n heterojunction between Co3O4 and SnO2. These results demonstrate that particular nanostructures and synergistic effect of SnO2 and Co3O4 enable gas sensors to selectively detect xylene.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）