SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Zhijian Bu,Zheng Tang,Qiaoqiao Diao,Qingzhen Tian,Shu Li,Xinyu Chen,Jinjin Liu,Hao Liang,Xiangheng Niu
As the most stable form of uranium in water and soil, uranyl ions (UO 2 2+ ) possess strong biological toxicity and radioactivity, causing a great threat to human health. Therefore, it is of significance to develop reliable methods for monitoring uranyl ions in the environment. Here we propose a “light-up” colorimetric strategy based on target-accelerated peroxidase-mimicking activity of Co 3 O 4 for the specific detection of uranyl ions. Original Co 3 O 4 nanoparticles exhibit a certain peroxidase-like activity in catalyzing colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB with the participation of H 2 O 2 . When UO 2 2+ is introduced, it interacts with the nanozyme rapidly and specifically and promotes the latter’s catalytic ability via increasing active oxygen vacancies on Co 3 O 4 surface. According to such a phenomenon and mechanism, selective determination of UO 2 2+ with favorable performance is achieved, with a linear measurement range of 0.2–10 μM and a detection limit of 0.08 μM. Reliability and practicability of the proposed method are demonstrated by analyzing the pollutant in several environmental water matrices. Our work not only offers a novel, efficient yet convenient approach for measuring UO 2 2+ , but may also inspire the exploration of new nanozyme-based sensing principles and strategies for other analytical applications.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Jiahua Zhang,Dong Xu,Dongsheng Lu,Hua Wang
Construction the electrocatalysts with multiple components is an effective strategy to enhance the activity for NH 3 generation in electrocatalytic nitrate reduction reaction (NITRR). Herein, we report a high performance electrocatalyst Co 3 O 4 -Cu 2+1 O/CF. The obtained Co 3 O 4 -Cu 2+1 O/CF nanosheets not only provide large active surface area but also construct the bimetal oxides interface for exerting Cu-Co tandem catalysis. Meanwhile, Co 3 O 4 -Cu 2+1 O/CF exhibits a maximum NH 3 -Faradaic efficiency of 96.5% and NH 3 yield of 0.26 mmol h −1 cm −2 in neutral solution with 10 mM NO 3 - . The control experiments and Tafel analysis clearly manifest the tandem catalysis mechanism on Co 3 O 4 -Cu 2+1 O/CF, where Cu 2+1 O favors the NO 3 - conversion to NO 2 - , while Co 3 O 4 selectively promotes NO 2 - conversion to NH 3 . The DFT calculations reveal that the strengthened NO 3 - adsorption and the enhanced adsorption of H* on Co 3 O 4 -Cu 2+1 O/CF jointly promote the selective formation of ammonia from NO 3 - reduction. This work provides the strategy of constructing the efficient transition metal composited electrocatalysts in NITRR.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Xiaogang Guo,Taotao Liang,Huisheng Huang,Binfang Yuan,Jing Wang
In 21st century, the microchip plays an essential role in data and information security, and preventing information leakage stored in chips becomes more challenging. This paper firstly introduced electrophoretic assembly technique and surface functionalization to design the C-doped nano-Al/Co 3 O 4 functional energetic material (nFEM) coating with triple stability of anti-wetting, micro-structure and energy-release for at least one year, and the energetic film was integrated with copper based-chip to construct the C-doped Al/Co 3 O 4 nFEM-chip to realize its self-destruction. Product shows outstanding anti-wetting properties with high water contact angle of 168 ± 1° and extremely low sliding angle of ∼ 1°, and well weather resistance in variable environments. Impressively, the output of heat (Q) of product can reach up to 3598 J/g nearly 85% of theoretical value with a relatively low activation energy of 235.46 kJ/mol, and keeps almost thermopositive stability even for immersed samples for fifty cycles after one year exposure test. In addition, C-doped Al/Co 3 O 4 nFEM-chip after immersion and exposure tests can also be effectively destroyed or ignited with a dazzling flame in an ultrashort time (<1ms), demonstrating the great advantage and huge application potentials for the design of other functional transient-chips with nano/micro-scale high-energy systems applied in different environments, even underwater.
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高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Xiaolong Guo,Xiaolin Hu,Dan Wu,Chuan Jing,Wei Liu,Zongling Ren,Qiannan Zhao,Xiaoping Jiang,Chaohe Xu,Yuxin Zhang,Ning Hu
The rational design of excellent electrocatalysts is significant for triggering the slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in rechargeable metal–air batteries. Hereby, we report a bifunctional catalytic material with core–shell structure constructed by Co3O4 nanowire arrays as cores and ultrathin NiFe-layered double hydroxides (NiFe LDHs) as shells (Co3O4@NiFe LDHs). The introduction of Co3O4 nanowires could provide abundant active sites for NiFe LDH nanosheets. Most importantly, the deposition of NiFe LDHs on the surface of Co3O4 can modulate the surface chemical valences of Co, Ni, and Fe species via changing the electron donor and/or electron absorption effects, finally achieving the balance and optimization of ORR and OER properties. By this core–shell design, the maximum ORR current densities of Co3O4@NiFe LDHs increase to 3–7 mA cm–2, almost an order of magnitude increases compared to pure NiFe LDH (0.45 mA cm–2). Significantly, an OER overpotential as low as 226 mV (35 mA cm–2) is achieved in the designed core–shell catalyst, which is comparable to and/or even better than those of commercial Ir/C. Hence, the primary zinc–air battery employing Co3O4@NiFe LDH as an air electrode achieves a high specific capacity (667.5 mA h g–1) and first-class energy density (797.6 W h kg–1); the rechargeable battery can show superior reversibility, excellent stability, and voltage gaps of ∼0.8 V (∼60% of round-trip efficiency) in >1200 continuous cycles. Furthermore, the flexible quasi-solid-state zinc–air battery with bendable ability holds practical potential in portable and wearable electronic devices.
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Yiwen Chen,Junguo He,Heliang Pang,Peigen Jiang,Fangshu Qu,Dehai Yu,Jie Zhang
A novel self-organized nanoporous V O -Co 3 O 4 /Co cathode was prepared via anodization and plasma treatment and obtained a significant nitrate reduction efficiency. In the anodization, an oxide layer with the nano-sized pore structure initially grew in-situ on the Co substrate and showed a better surface area. Subsequently, He-plasma increased surface oxygen vacancies (V O ) from 24 % to 57 %. Electrons in vacancies were charged into empty e g orbital of low-spin Co 3+ (O h , octahedral) and firstly generated high-spin Co 2+ (O h ) with the configuration of t 2g 6 e g 1 , accounting for 71.7 % of cobalt species. Accordingly, two original mechanisms (Vo-catalyzed and Co 2+ (O h )-catalyzed) were concluded in this study. Oxygen vacancies increased the charge intensity and served as absorption sites in nitrate reduction. Meanwhile, massive Co 2+ (O h ) provided electrons in the e g orbital with a higher energy state and mediated the faster electron transfer through a Co 2+ –Co 3+ –Co 2+ redox cycle, compared with Co 2+ (T d , tetrahedral). Ultimately, a faster reaction kinetic of 0.0220 min −1 was achieved by V O -Co 3 O 4 than other cathodes e.g., Co 3 O 4 (0.0150 min −1 ). Such V O -Co 3 O 4 /Co cathode-based denitrification strategy displayed great advantages in engineering application and completely removed 90 % of TN from actual wastewater.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2019
·
IF 3.834
Shenhao Yuan,Xushuai Lv,Yiwei Zhang,Yangjin Wu,Chunfeng Mao,Yuming Zhou,Wenxia Chen,Yanyun Wang
A core-shell structure Au-based catalysts mSiO 2 /Au/Co 3 O 4 HS were successfully derived from in-situ growth ZIF-67 hollow spheres, which were synthesized by a one-step soft template method. The samples were characterized by SEM, TEM, EDX, XPS, XRD and BET to confirm its successful preparation and structural features. The catalytic performance of the catalysts were evaluated by liquid phase oxidation of benzyl alcohol to benzaldehyde with O 2 as the oxidant under alkaline conditions. The experimental results illustrated that reaction conditions, including effect of catalyst amount, oxygen flow rate, reaction temperature and reaction time, were optimized to be 40 mg, 50 ml/min, 140 °C and 5 h, respectively. Meanwhile, 55% conversion of benzyl alcohol and 84% selectivitiy to benzaldehyde together with the excellent reusability and stability were achieved under optimal reaction conditions, which was attributed to the core-shell structure leading to the encapsulation of Au NPs and provision of multiple active reaction interface. Based on the intermediates formed from the de-protonation of substrate, a plausible oxidation reaction mechanism with mSiO 2 /Au/Co 3 O 4 HS catalysts was tentatively proposed to study the relationship between structure and catalytic performance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yarong Bai,Junping Dong,Yaqin Hou,Yaoping Guo,Yongjin Liu,Yulin Li,Xiaojin Han,Zhanggen Huang
Herein, a series of Co 3 O 4 nanoparticles inlaid in porous carbon (CoO x @PC-T) were successfully prepared via first pyrolysis of ZIF-67 in argon atmosphere at different temperature and then oxidized in 5% O 2 /Ar mixed gas. The as-made samples were employed as catalysts for selective catalytic reduction of NO x with NH 3 at low temperature (100 °C–200 °C). The effect of pyrolysis temperature on the microstructure, textural properties, and chemical properties of CoO x @PC-T were characterized by TG-MS, BET, XRD, SEM, TEM, H 2 -TPR and XPS in detail. Results show that the pyrolysis temperature has a significant effect on the carbonization degree of carbon in ZIF-67, and which in turn affects the exposure and oxidization of cobalt nanoparticles on the catalyst surface. Experiments results show that CoO x @PC-800 display the highest NO x conversion ratio, which is attributed to its higher ratio of Co 3+ /Co 2+ and large specific surface area. Moreover, the stability, H 2 O and SO 2 resistance of CoO x @PC-800 were also studied.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Liang Chen,Xin Li,Chenxi Xu,Fujia Wang,Wei Wang,Gangyong Li,Minjie Zhou,Binhong He,Wenyuan Xu,Zhaohui Hou
The design and exploitation of advanced transition metal oxides (TMO)/carbon hybrid anodes remain significant but challenging for the evolution of lithium–ion batteries (LIBs). In this work, Co 3 O 4 nanodots anchored into 2D N-doped carbon nanosheets (Co 3 O 4 NDs/NCN) hybrid is successfully fabricated by a facile salt-template assisted pyrolysis strategy using glucose, Co(NO 3 ) 2 ·6H 2 O and NaCl salt template as reaction precursors. The morphology, structure and composition of the resultant Co 3 O 4 NDs/NCN hybrid are systematically investigated, and the effect of salt template on the preparation of products is also deeply explored. It is surprisingly found that the introduction of NaCl template promotes the formation of Co 3 O 4 , which is different from what has been reported previously. In addition, the added NaCl template can be used to regulate the microstructure of Co 3 O 4 NDs/NCN hybrid, which displays unique micromorphology (Co 3 O 4 NDs anchored into 2D NCN), successful N doping in carbon matrix, Co-N-C bond between two components and much increased specific surface area. As a result, this hybrid shows excellent lithium storage performance when used as the anode for LIBs, which can be comparable to those previously reported Co 3 O 4 /C hybrid anodes. Clearly, this work offers a good reference for the construction of low-cost and high-performance TMO/carbon LIBs anodes.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Xu Zhao,Haoran Yang,Ke Shang,Yu Zhang,Yingjie Zhang,Mian Li,Xiangjie Bo,Tingting Liu
The recovery of valuable cobalt (Co) metal from lithium-ion batteries (LIBs), when combined with advanced synthesis techniques, presents a promising strategy for the development of high-efficiency and low-cost electrocatalysts, thereby enhancing the performance of water splitting reactions. In this study, novel 3D hierarchically porous structures composed of stacked 2D porous nanosheets (denoted as Co 3 O 4 /Co/CP) are synthesized utilizing Co resources recovered from spent LIBs. The Co 3 O 4 /Co/CP 4 h catalyst exhibits an oxygen evolution reaction (OER) potential of 1.554 V vs. reversible hydrogen electrode (RHE) at 10 mA cm −2 ( E 10 ), which is 81 mV lower than that of RuO 2 (1.635 V vs. RHE). In two-electrode configuration, the Co 3 O 4 /Co/CP 4 h nanosheets based electrolyzer achieves 10 mA cm −2 at a cell voltage of 1.63 V, representing a 60 mV improvement over the 20 wt% Pt/C||RuO₂ benchmark system. The highly porous architecture of the Co 3 O 4 /Co/CP 4 h nanosheets facilitates enhanced exposure of active sites and promotes efficient mass transport. The in-situ Raman spectroscopy confirms surface reconstructions during OER, with the formation of abundant electrochemically active CoOOH species, thereby significantly enhances the reaction kinetics. The in-situ EIS results reveal the efficient electron and mass transfer capabilities, which arise from the synergistic interaction between the highly conductive Co and the abundant porous channels within the well-defined nanosheet architecture. This study successfully demonstrates an innovative industrial chain that recycles Co from spent LIBs to fabricate high-efficiency and lost-cost HER/OER electrocatalysts. This approach not only promotes the efficient utilization of Co in spent devices but also accelerates the commercialization of hydrogen production through water electrolysis.
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高影响因子
INORGANIC CHEMISTRY
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2019
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IF 4.85
Ranran Ding,Kunlin Liu,Xu Liu,Zhenhua Li,Chengyang Wang,Mingming Chen
We prepared a multilayer-sandwiched Co3O4/NGC/rGO composite by introducing in situ electrostatic self-assembly method with a subsequent thermal annealing induced Kirkendall effect. In the composite, the hollow Co3O4 nanospheres surrounded by N-doped graphitic carbon (NGC) layer are tightly sandwiched between the reduced graphene oxide (rGO) layers. The layer-by-layer multilayer-sandwiched structure and strong electrostatic interaction bring the space confinement effect and close electrical contact between different components, which greatly strengthen the durability of the electrode structure and electron/ion transport kinetics. Detailed characterization based on electrochemical impedance spectra (EIS) and cyclic voltammograms (CVs) tests confirms that the Co3O4/NGC/rGO electrode possesses accelerated electron/ion-transfer kinetics and enhanced surface-controlled capacitive behaviors. The discharging profile and its differential capacity curve further validate the existence of interfacial storage lithium in the composite, contributing to high reversible capacity. Consequently, benefiting from the synergistic effects of the multilevel controls in component and structure aspects, the Co3O4/NGC/rGO composite displays a superior reversible capacity (930.8 mA h g–1 at 0.5 A g–1), desired rate performance (584 mA h g–1 at 10 A g–1), as well as stable cycling lifetime of over 300 loops with almost no capacity fading even without any additional conductive additives.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
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IF 5.116
Tianrong Zhan,Sisi Lu,Xiaolin Liu,Hongni Teng,Wanguo Hou
Fabricating high-performance and low-cost bifunctional electrocatalysts for both oxygen evolution and reduction reactions is vital for the practical application of renewable energy conversion. Herein, a hybrid of Co 3 O 4 /Co active species incorporated in N-doped porous carbon matrix, denoted as Co 3 O 4 /Co-NPC, has been prepared using a scalable and facile method involving the carbonization of alginate composite after a Co ion exchange with sustainable seaweed biomass. The 3D Co 3 O 4 /Co-NPC exhibits good bifunctional oxygen electrocatalytic performance in alkaline medium. The proposed catalyst gives the smaller onset potential (1.450 V vs. RHE) and overpotential (277 mV) at 10 mA cm −2 current density , indicating a superior oxygen evolution reaction activity to commercial IrO 2 catalyst. It also performs the excellent oxygen reduction catalytic activity with larger onset potential (0.91 V vs. RHE), more positive half wave potential (0.806 V vs. RHE) and bigger diffusion-limiting current density (−5.86 mA cm −2 at 0.4 V). The Co 3 O 4 /Co-NPC hybrid experiences an almost ideal 4e process with better long-term stability and anti-methanol ability than commercial Pt/C catalyst in 0.1 M KOH. The prominent bifunctional activity of Co 3 O 4 /Co-NPC can be due to the synergistic effects of the well dispersed Co 3 O 4 /Co active species and N-doped porous carbon nanostructure .
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高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 3
·035401
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IF 3.399
Tianli Han,Yingyi Ding,Yu Chen,Dong Cheng,Ping Zhou,Jinyun Liu
High capacity and stable anodes are demanded since the current graphite-based anode does not meet the high-performance requirements of emerging Li-ion battery systems. Herein, we present a novel spring-shaped hierarchical SiO2@Co3O4 nanowire composite, which exhibits good Li-storage performance. The special structure is able to effectively accommodate the change in structure during charge–discharge, and the coaxial hierarchical morphology enables rapid Li+ ion and electron transfer. The spring-shaped SiO2@Co3O4 anode exhibits a capacity of 770 mAh g−1, along with a high Coulombic efficiency of 99.8% after 400 cycles. A stable rate performance even after three rounds of measurements is also achievable. In addition, the real-time lithiation of the SiO2@Co3O4 composite is investigated through an in situ transmission electron microscopy technology, which demonstrates the stable structure of the spring-shaped SiO2@Co3O4 composite during the rapid lithiation process.
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高影响因子
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