JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Lu Tian,Dazhong Zhong,Tao Zhao,Yi Liu,Lu Hao,Qiang Fang,Xuelei Lang,Xin Zhao,Genyan Hao,Guang Liu,Jinping Li,Qiang Zhao
Developing highly efficient OER catalysts is essential for producing hydrogen from water electrolysis to compensate for conventional fossil fuel shortages. Here, the oxygen-vacancy-rich heterostructure grown on the Ni foam (NF) (Co 3 O 4 @Fe-B-O/NF) is fabricated. The synergistic effect between Co 3 O 4 and Fe-B-O has been proven effectively modulate the electronic structure and produce highly active interface sites, ultimately leading to enhanced electrocatalytic activity. Co 3 O 4 @Fe-B-O/NF requires an overpotential of 237 mV to drive 20 mA cm −2 in 1 M KOH, and 384 mV to drive 10 mA cm −2 in 0.1 M PBS, superior to most catalysts currently used. Moreover, Co 3 O 4 @Fe-B-O/NF as an oxygen evolution reaction (OER) electrode shows great potential in overall water splitting and CO 2 reduction reaction (CO 2 RR). This work may provide effective ideas for designing efficient oxide catalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Cong Qin,Zhanxiang Wei,Bing Wang,Yingde Wang
In the realm of gas sensors, p-type metal oxide semiconductor (MOS) usually exhibits inherently low sensitivity toward target gases caused by the hole accumulation layer configuration , which seriously hinders its practical application. Diatomics co-doping is an efficient tactic for adjusting the characteristics of MOS related to gas-sensing due to their synergistic effect . In this work, we controllably synthesized bare Co 3 O 4 , Sn-doped Co 3 O 4 , Mn-doped Co 3 O 4 and Sn/Mn co-doped Co 3 O 4 nanosheets . The experimental results reveal that Sn/Mn co-doped Co 3 O 4 sample presents porous nanosheets structure. 1 mol% Sn/Mn co-doped Co 3 O 4 sensor presents enhanced response [(R g -R a )/R a = 330 %∼40 ppm at 150 °C] toward CO compared with the bare Co 3 O 4 , 1 mol% Sn-doped Co 3 O 4 , and 1 mol% Mn-doped Co 3 O 4 nanosheets. Besides, 1 mol% Sn/Mn co-doped Co 3 O 4 nanosheets show a low limit of detection (500 ppb/experimental value), good stability and selectivity. We infer that the good CO-sensing properties may be ascribed to the oxygen vacancies defects generated by Sn 4+ and Mn 2+ /Mn 3+ co-doping, high Co 3+ ratio, and high specific surface area. This study affords an effective co-doping strategy for enhancing the gas-sensing performances of p-type MOS.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 1
·211-219
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IF 3.925
Yulin Xin,Shixiang Lu,Wenguo Xu,Shasha Wang
Hydrothermal synthesis and annealing process were used to create a honeycomb-structured composite electrode material on nickel foam substrate that contained praseodymium oxide (Pr2O3), cobalt oxide (Co3O4), and reduced graphene oxide (rGO) (named as Pr2O3/Co3O4/rGO/NF). The Pr2O3/Co3O4/rGO/NF (PCGN) composite electrode material was created without the need for a binder and can be employed right away to create a supercapacitor. This honeycomb composite is further grown by the mesh structure of Pr2O3 and Co3O4, which has good electrical conductivity. This nanomorphology not only improves the specific surface area of the material but also facilitates the improvement of electron transfer efficiency. The synthesized electrode material has excellent electrochemical properties due to its special morphology and excellent conductivity, and its performance is better than that of praseodymium oxide and cobalt oxide alone, with a specific capacitance of 3316 F g−1 in the three-electrode system at a current density of 1 A g−1. After forming a symmetrical supercapacitor device, the energy density is 74.8 W h kg−1 and the power density is 300 W kg−1 at 0.5 A g−1. The capacitance retention is 82% even after 35 000 cycles at 2 A g−1.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Youlian Zhu,Guangtao Wei,Jiahao Ma,Linye Zhang,Chen Xu,Yu Huang,Dingyi Xu
In this work, a flower-like structure and oxygen vacancies (OVs) enriched bentonite-based Co 3 O 4 (Co 3 O 4 /Bent) was successfully prepared, and then was applied as a new activator of peroxymonosulfate (PMS) to degrade lomefloxacin hydrochloride (LOMH). The characterization results demonstrated that Co 3 O 4 /Bent had a flower-like structure, high Co(Ⅱ)/Co(III) ratio and high OVs content. The optimal composite of Co 3 O 4 /Bent held a high catalytic activity in LOMH degradation, and approximately 87.2 % of LOMH (30 mg/L) could be degraded at 60 min by using Co 3 O 4 /Bent (0.2 g/L) to activate PMS (3.0 mmol/L). And the quenching experiments revealed that 1 O 2 , ·OH, SO 4 ·- and ·O 2− were the active species and 1 O 2 played a main role in the LOMH degradation process. The possible degradation pathways were revealed based on DFT calculation and LC-MS analysis. This work suggested that the Co 3 O 4 /Bent composite was an efficient catalyst to activate PMS to treat LOMH in wastewater.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaohui Peng,Mingzhe Li,Lihua Huang,Qizhe Chen,Weiwei Fang,Yuyang Hou,Yusong Zhu,Jilei Ye,Lili Liu,Yuping Wu
Developing ideal Li–O2 batteries (LOBs) requires the discharge product to have a large quantity, have large contact area with the cathode, and not passivate the porous surface after discharge, which put forward high requirement for the design of cathodes. Herein, combining the rational structural design and high activity catalyst selection, minor amounts of RuO2-incorporated Co3O4 nanoneedles grown on carbon cloth are successfully synthesized as binder-free integrated cathodes for LOBs. With this unique design, plenty of electron–ion–oxygen tri-phase reaction interface is created, the side reaction from carbon is isolated, and oxygen reduction reaction/oxygen evolution reaction (OER) kinetics are significantly facilitated. Upon discharge, film-like Li2O2 is observed growing on the needle surface first and eventually ball-like Li2O2 particles form at each tip of the needle. The cathode surface remains porous after discharge, which is beneficial to the OER and is rare in the previous reports. The battery exhibits a high specific discharge capacity (7.64 mAh cm–2) and a long lifespan (500 h at 0.1 mA cm–2). Even with a high current of 0.3 mA cm–2, the battery achieves a cycling life of 200 h. In addition, punch-type LOBs are fabricated and successfully operated, suggesting that the cathode material can be utilized in ultralight, flexible electronic devices.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yan Hu,Zhendong Zhao,Huiwang Dai,Wenjun Zhou
Efficient, stable, and reusable composite of Co 3 O 4 /g-C 3 N 4 with abundant oxygen vacancies (OVs) were successfully constructed using a facile grinding and calcination method. The catalytic performances of OVs-enriched Co 3 O 4 /g-C 3 N 4 activated peroxymonosulfate (PMS) for the degradation of phenanthrene (PHE) and their underlying mechanisms were investigated. The catalytic activity of xCo 3 O 4 -C 3 N 4 with OVs was significantly greater than that of Co 3 O 4 -C 3 N 4 without OVs, and there was a substantial positive correlation between the degradation rate constant of PHE and the OVs content in xCo 3 O 4 -C 3 N 4 . Quenching experiments and EPR tests demonstrated that 1 O 2 is the dominant active species in the 2.0Co 3 O 4 -C 3 N 4 /PMS system, which differs from the radical-dominated activation pathway of conventional cobalt-based heterogeneous catalysts . The results indicate that the OVs introduction in the catalyst can effectively modulate the PMS activation pathway, and the proposed non-radical systems can achieve efficient degradation of PHE. In addition, the synergistic interaction between the redox cycle of Co 2+ /Co 3+ and the electron-rich O-C 3 N 4 carrier favored the degradation of PHE via the radical pathway. This study provides a new theoretical basis and reference for the facile preparation of PMS catalysts and even envision this approach may open new vistas in the application of non-radical systems in refractory organic pollutant treatment.
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APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Songlin Li,Chen Wang,Zhaohui Lei,Shanfu Sun,Jie Gao,Pengfei Cheng,Hai Wang
A deep understanding of the relationship between the properties and structure of transition metal oxide semiconductor gas sensors is essential for optimizing sensor design. Comparing and analyzing the sensing properties of nanomaterials with different morphologies and crystal facets by combining the experiment analysis and the density functional theory (DFT) calculations could identify and understand the corresponding mechanisms at the atomic or ionic level. Here, grown Co 3 O 4 nanosheet (Co 3 O 4 -NS) with exposed (1 1 1) facets, and Co 3 O 4 nanorods (Co 3 O 4 -NR) with exposed (1 1 0) facets on alumina ceramic tubes were prepared and studied in sensing ethanol. The adsorption characteristics of ethanol on the sensor surface were analyzed by DFT calculation. The results demonstrated that the sensing performance of Co 3 O 4 -NR was superior to Co 3 O 4 -NS. The adsorption of hydroxyl groups in ethanol was better than the methyl groups on the surface. The oxygen and hydrogen atoms from the hydroxyl groups in ethanol had the lowest adsorption energies (E ads = −3.44 eV) when they interact with the Co atom and the indirectly adjacent low-coordinate oxygen atoms on the (1 1 0) surface, respectively. The synergistic adsorption of target gases by exposed surface atoms induced superior sensing properties of the material.
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Journal of the Taiwan Institute of Chemical Engineers
·
2023
·
IF 5.7
Chengzhi Hu,Huiping Zhang,Ying Yan
Background Co 3 O 4 shows potential as a cost-effective alternative to precious metal catalysts for VOCs catalytic combustion. However, its catalytic activity requires further enhancement. Methods A new type of paper-like carbon nanotube membrane composite (CNTs/PSSF) was used as a support to prepare Co 3 O 4 -CNTs/PSSF catalysts by metal-organic vapor deposition (MOCVD) and impregnation method (IM) respectively for toluene combustion. Besides, the effects of acid treatment to support on the catalytic activity were investigated. Various characterization techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and oxygen temperature-programmed desorption (O 2 -TPD), were employed to evaluate the effects of different preparation methods and acid treatment on the structure and catalytic performance mechanism of Co 3 O 4 -CNTs/PSSF. Significant findings The preparation method significantly affects the catalyst's properties and catalytic activity. Compared with IM, the MOCVD-prepared catalysts show stronger coordination of carbon nanotubes, resulting in more oxygen vacancies and surface active oxygen. Additionally, oxygenous groups introduced by HNO 3 form Co-O-C linkage between Co and CNTs, promoting oxygen vacancies and enhancing surface active oxygen content, thereby dramatically improving the catalyst's catalytic activity, especially for HIM-10 whose T 90 is reduced by 140 °C. This work provides insights for enhancing the catalytic combustion activity of cobalt oxide.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Konghu Tian,Yanan Huang,Jing Wang,Chao Zhang,Ruiwen Shu,Zhihong Chen,Xiaowei Liu,Yufei Li,Lixin Xu
The demand for flexible electromagnetic wave (EMW) absorbing materials has increased, highlighting the importance of designing efficient and adaptable EMW absorbing materials. In this study, flexible Co 3 O 4 /carbon cloth (Co 3 O 4 /CC) composites with high EMW absorption properties were prepared via a static growth method and annealing process. The composites exhibited remarkable properties, with the minimum reflection loss ( RL min ) and maximum effective absorption bandwidth (EAB, RL ≤ –10 dB) of –54.43 dB and 4.54 GHz, respectively. The flexible carbon cloth (CC) substrates exhibited outstanding dielectric loss due to their conductive networks. Moreover, the uniformly and tightly organized Co 3 O 4 arrays on the flexible CC substrate played a crucial role in fine-tuning the impedance matching and facilitating abundant multiple scattering and interface polarization. This study proposes a promising approach to preparing flexible Co 3 O 4 /CC composites with a significant reference value for the field of flexible EMW.
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Yuling Chen,Yali Wen,Qun Zhou,Lina Shen,Fanghui Du,Pai Peng,Yu Chen,Junwei Zheng
Herein, Pd nanoparticles loaded Co 3 O 4 catalysts (Pd@Co 3 O 4 ) are constructed from zeolitic imidazolate framework-67 (ZIF-67) for the ethanol oxidation reaction (EOR). It is demonstrated for the first time that the electrochemical conversion of Co 3 O 4 support would result in the charge distribution alignment at the Pd/Co 3 O 4 interface and induce the formation of highly reactive Pd-O species (PdO*), which can further catalyze the consequent reactions of the intermediates of the ethanol oxidation. The catalyst, Pd@Co 3 O 4 -450, obtained under the optimized conditions exhibits excellent EOR performance with a high mass activity of 590 mA mg −1 , prominent operational stability, and extraordinary capability for the electro-oxidation of acetaldehyde intermediates. Importantly, the detailed mechanism investigation reveals that Pd@Co 3 O 4 -450 could be benefit to the C–C bond cleavage to promote the desirable C1 pathway for the ethanol oxidation reaction. The present strategy based on the metal-support interaction of the catalyst might provide valuable inspiration for the design of high-performing catalysts for the ethanol oxidation reaction.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shengyu Zhang,Gongxin Zhang,Shuangzhi Wu,Zhongjie Guan,Qiuye Li,Jianjun Yang
Integration of photothermal materials and photocatalysts can effectively improve photocatalytic hydrogen production. However, the synergistic mechanism of photothermal effect and heterojunction still need to be deeply investigated. Herein, Co 3 O 4 @ZnIn 2 S 4 (ZIS) core–shell heterojunction was constructed as a photothermal/ photocatalytic integrated system for photocatalytic hydrogen production. The photothermal effect induced by Co 3 O 4 boosts the surface reaction kinetic of hydrogen evolution with an apparent activation energy decrease from 42.0 kJ⋅mol −1 to 33.5 kJ⋅mol −1 . The photothermal effect also increases the charge concentrations of Co 3 O 4 @ZIS, which ameliorates the conductivity of Co 3 O 4 @ZIS and thus benefits to charge transfer. In addition, a p-n junction forms between Co 3 O 4 and ZIS and provides a built-in electric field to enhance charge separate and prolong charge life time. Benefiting from the synergy of photothermal effect and heterojunction, the photocatalytic performance of Co 3 O 4 @ZIS is significantly improved with a highest hydrogen evolution rate of 4515 μmol⋅g −1 ⋅h −1 , which is about 3.5 times higher than that of pure ZIS. This work offers a full perspective to understand the photothermal/photocatalytic integrated conception for solar hydrogen production.
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CHEMOSPHERE
·
2023
·
IF 8.8
Hao Cheng,Liwen Zhang,Jun Feng,Tingfan Tang,Danfeng Qin
A novel, sensitive Ti 3 C 2 MXene/Co 3 O 4 /carbon nanofibers (Ti 3 C 2 MXene/Co 3 O 4 /CNFs) composite was synthesized via a HF exfoliating Ti 3 AlC 2 strategy, followed by doping Co 3 O 4 and Ti 3 C 2 MXene into the CNFs via a combination electrospinning and thermal annealing process. Ti 3 C 2 MXene/Co 3 O 4 /CNFs composite exhibits higher catalytic effect, conductivity, chemical stability, and electrochemical performance than Co 3 O 4 and Ti 3 C 2 MXene in electrochemical impedance, differential pulse stripping voltammetry, chronocoulometry, and cyclic voltammetry tests. This Ti 3 C 2 MXene/Co 3 O 4 /CNFs hybrid modified electrode provides fast analysis of 4-aminophenol (4-AP) with ultrahigh sensitivity, enhanced reproducibility and strong anti-interference capability. Furthermore, the level of 4-AP was quantified by this electrode with a wide linear range from 0.5 to 150 μM (R 2 > 0.99) and a low detection limit about 0.018 μM was achieved. Finally, the fabricated electrode was used for fast and sensitive analysis of 4-AP spiked in tap water and blood serum samples. This work presents the new Ti 3 C 2 MXene/Co 3 O 4 /CNFs electrode provides a platform for 4-AP monitoring and has the advantages of high selectivity , accuracy, simplicity, and rapid analysis.
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