JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lixin Sun,Yunong Qin,Lishan Fu,Yutong Di,Kaidi Hu,Hailong Li,Ling Li,Wenming Zhang
Secondary zinc-air batteries (ZABs) with a free-standing and flexible air electrode integrated with distinguished bifunctional oxygen electrocatalysts are crucial for achieving better performance. Herein, benefitting from the rational design and simple synthesis, a highly controlled design can be achieved for the first showing of the synthesis of Co 3 O 4 /Fe 2 O 3 NAs@CNFs with a unique hierarchical nanostructure , consisting of randomly distributed zero-dimensional (0D) Co 3 O 4 /Fe 2 O 3 nanoparticles embedded in two-dimensional (2D) MOF derived nitrogen-doped mesoporous carbon flake nanoarrays grown on three-dimensional (3D) microporous network with interconnected conductive one-dimensional (1D) carbon nanofibers from carbonized electrospinning polymer nanofiber film (PMNFs). Under the synergy of 3D hierarchical porous nanostructure and abundant accessible active sites, Co 3 O 4 /Fe 2 O 3 NAs@CNFs is endowed with excellent bifunctional electrocatalytic activities like those of commercial Pt/C and RuO 2 , respectively. Rechargeable aqueous ZABs based on Co 3 O 4 /Fe 2 O 3 NAs@CNFs as air electrodes outperform their counterparts based on Pt/C and RuO 2 loaded carbon nanofibers (CNFs) as air electrodes, with a maximum power density of 246 mW cm −2 and excellent cycling stability with no increased polarization even after 40 h. And the assembled flexible solid-state ZABs with Co 3 O 4 /Fe 2 O 3 NAs@CNFs also display superior performance and bendability.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Minghu Zhao,Jiuhu Zhao,Ran Ding,Rongshu Zhu,Haiyan Li,Zhi Li,Jingwen Zhang,Yongji Zhu,Huiying Li
The existence of sulfur dioxide and water vapor in the flue gas generated from waste-to-energy stations could lead to catalyst deactivation , which has adverse effects on NO x removal. It is thus particularly important to study the reaction mechanism of catalyst resistance to poisoning. Herein, we report the mechanism of In-Co 3 O 4 -Ga 2 O 3 /H-Beta catalyst to SO 2 and H 2 O resistance in the selective catalytic reduction (SCR) of NO x by CH 4 . The catalyst could achieve 74.6% NO x removal efficiency in the presence of 100 ppm SO 2 and 5% H 2 O. In this catalyst, Co 3 O 4 is attributed to enhancing the reversible poisoning of SO 2 and CH 4 activation and increasing the number of Brønsted acid sites by decomposing H 2 O. However, the InO + active center was still eroded by a small amount of water vapor, leading to a reduction in NO x removal efficiency. The addition of Ga 2 O 3 primarily provided an important intermediate NO 2 for CH 4 -SCR reaction and reduced the aggregates of Co 3 O 4 to increase the exposure of indium sites, and could reduce a part of SO 2 to S 2− . This study provides a good candidate for preparing catalysts with superior resistance towards SO 2 and H 2 O for CH 4 -SCR.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 34
·345702
·
IF 3.874
Yuqiang Zhang,Yan Wang,Jiahui Zhu,Xubin Zhang,Wangfeng Cai
A flower-like structured electrode material of Co3O4@Ni–Co layered double hydroxide (LDH) grown on Ni foam (Co3O4@Ni–Co LDH/NF) was prepared via an in situ growth, annealing and electrodeposition process. The Co3O4@Ni–Co LDH/NF electrode was prepared with the optimized conditions of annealing temperature 300 °C, deposition time 20 min and Ni/Co ratio 1:1. The results showed that the as-prepared electrode material exhibited an excellent specific capacitance and great cycling stability. Furthermore, an quasi-solid-state supercapacitor was assembled using the prepared Co3O4@Ni–Co LDH/NF as the positive electrode and activated carbon on Ni foam (AC/NF) as the negative electrode. The as-assembled device presented a high energy density and power density.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Yonglong Huang,Zhengkang Duan,Chuan Li,Tian Qiu
The catalytic dehydrogenation of diethanolamine to prepare iminodiacetic acid has attracted considerable research interest. However, the lack of understanding of the structure-activity relationship of the reaction can present a challenge to the control of the catalytic behavior. Concurrently, improving the catalytic performance and reducing the cost have also become urgent issues that require resolution. This work examined the catalytic mechanism of several Cu-Ni X /ZrO 2 catalysts, differing in Cu/Ni ratios, prepared by H 2 reduction, in the context of DEA dehydrogenation to elucidate the structure-activity connection and probable reaction mechanism. Subsequently, a strategy has been put out to generate metal (Ni and Co)-doped copper-zirconium catalysts using the co-precipitation-hydrazine hydrate reduction process. The synergistic effect between metals was combined with the improvement of the surface reaction of the catalyst by hydrazine hydrate through a more efficient preparation method, thereby enhancing the catalyst's overall performance. The representative catalyst Cu-Ni/ZrO 2 required a hydrazine hydrate reduction temperature and time of 40 °C and 30 min, and after 65 min of reaction, it exhibited a high conversion rate (96.3 %) and yield (93.7 %), and after five cycles, both the conversion rate and yield exceeded 85 %. Various characterization techniques have confirmed that Ni doping induced an alloying effect and a size effect. Additionally, the hydrazine hydrate reduction method was discovered to augment the specific surface area, surface hydroxyl groups, hydrophilicity, and optimize the pore size distribution of the catalyst while also regularizing its morphology, thereby significantly enhancing the activity and stability of the metal-doped copper-zirconium catalyst. This paper discussed the correlation between catalyst structure and reaction performance, as well as the catalytic conversion mechanism, which is anticipated to provide a novel reference for the preparation, performance control, and potential applications of dehydrogenation catalysts.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Jiaqi Geng,Zhichao Tian,Ruiping Wang,Junxiu Liu,Miaojun Xu,Huiying Wen,Mingyang Zhu,Bin Li
Linear low-density polyethylene (LLDPE) is flammable and produces severe molten droplets and toxic smoke, posing a great threat to life and property safety. To address these challenges, ZIF−67-derived nano-carbon-nitrogen-coated Co 3 O 4 (n-Co 3 O 4 @C-N) was synthesized and employed as a synergist for an intumescent flame retardant (IFR) in LLDPE. When IFR/n-Co 3 O 4 @C-N was introduced, LLDPE composites achieved a UL−94 V−0 rating and the limiting oxygen index of 26.8%. Cone calorimeter test results further demonstrated that the total heat release of LLDPE/IFR/n-Co 3 O 4 @C-N−3 decreased by 23.2% compared with pure LLDPE, indicating remarkable suppression of fire intensity. Compared with LLDPE/IFR and LLDPE/commercial-Co 3 O 4 , LLDPE/IFR/n-Co 3 O 4 @C-N−3 exhibited a reduction in total smoke production by 50.3% and 37.2%. The high specific surface area of n-Co 3 O 4 @C-N facilitates sufficient contact with the polymer matrix, enhancing catalytic carbonization and forming a robust graphitized char layer. Furthermore, as a p-type semiconductor, n-Co 3 O 4 @C-N has a narrower band gap, reducing the energy required for electron transition, and its higher hole concentration helps to oxidize more CO to low-toxicity CO 2 , thereby lowering the concentration of toxic gases. This study presents a promising strategy to fabricate flame-retardant, smoke-suppressing, and low-toxic LLDPE composites, thus effectively overcoming the existing technical limitations in wire and cable application fields.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Haibin Wang,Xiaoqiang Du,Xiaoshuang Zhang,Lu Li
Electrocatalytic water splitting has become one of the most promising and effective ways to solve energy crises and environmental pollution. In this work, a series of M-doped Co 3 O 4 materials with foreign ions (M = Ce, Ni and Fe) were grown on a Ni foam substrate through classical hydrothermal and calcination methods. It is worth noting that not all doping of foreign ions can promote the electrocatalytic performance of intrinsic materials. The Ce-doped Co 3 O 4 material shows excellent oxidation properties of water (overpotential of 320 mV at 50 mA cm −2 ) and urea (potential of 1.39 V at 50 mA cm −2 ). However, the doping of Ni reduces the water oxidation performance of the intrinsic material (overpotential of 410 mV@ 50 mA cm −2 ), and the doping of Fe reduces the urea oxidation performance of the inherent material (potential of 1.45 V@ 50 mA cm −2 ). A series of experimental results indicate that the improved activity of the Ce-Co 3 O 4 electrode is attributed to faster electron transport capacity, higher exposure to active sites, and improved conductivity due to doping of Ce. It is noteworthy that the doping of these ions does alter the rate-determination step for the water oxidation reaction. The stability test demonstrated that the current density of water oxidation and urea oxidation of the catalyst had no significant attenuation after a long electrocatalytic activity test. This work provides a new idea for improving the electrocatalytic activity of catalysts by a doping strategy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaowan Zhang,Dan Li,Mengyuan Li,Peige Qin,Shiping Zhu,Yanmei Gao,Mengyao Mu,Ning Zhang,Youmei Wang,Minghua Lu
Sensitive detection of environmental pollutants that are harmful to organisms is of great significance for prevention of related diseases. In this work, a flower-like Co 3 O 4 /C 3 N 5 composite as solid-phase microextraction fiber coating was developed for extraction of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). The Co 3 O 4 /C 3 N 5 composite was derived from the multilayer stacked flower shaped Co(OH) 2 /C 3 N 5 that synthesized by one-pot solvothermal method. Compared with pure monomer materials, the unique structure was maintained and the surface adsorption sites were fully exposed, thereby the adsorption performances of Co 3 O 4 /C 3 N 5 were significantly improved. As a result, the enrichment factors were 3010–5012 for PAHs, and 4499–6180 for PCBs. Under the optimized conditions, the developed method showed wide linear range (0.0005–20 ng mL −1 ) with good linearity (R 2 greater than 0.9912), low detection limits (0.00017–0.061 ng mL −1 , S/N = 3) and quantification limits (0.0005–0.2 ng mL −1 , S/N = 10) for three PAHs and five PCBs. The RSDs (n = 5) of intraday and interday were 2.28–8.35% and 3.49–9.59%, respectively. The reproducibility between fibers (n = 3) was in the range of 7.84–11.96%. The developed method was successfully applied to real water sample with satisfactory recoveries of 81.07–109.1%. As a simple and robust technique, the proposed method will be an alternative way to the analysis of PAHs and PCBs in real samples.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zeming Wang,Zihao Wang,Wei Li,Yeqing Lan,Cheng Chen
The hybrids of Co 3 O 4 anchored on different crystallographic MnO 2 (α-MnO 2 @Co 3 O 4 , β-MnO 2 @Co 3 O 4 , γ-MnO 2 @Co 3 O 4 , and δ-MnO 2 @Co 3 O 4 ) were synthesized and applied in peroxymonosulfate (PMS) activation for the degradation of sulfisoxazole (SIZ). Various characterizations were conducted to explore the physicochemical properties of the hybrids, and their catalytic activities were compared. The SIZ degradation followed pseudo-first-order kinetics, and the rate constants ( k obs ) were 0.1135, 0.0307, 0.1080, and 0.0285 min −1 for α, γ, β, and δ-MnO 2 , respectively. The introduction of Co 3 O 4 greatly improved the catalytic activities of the MnO 2 hybrids, and more than 94.7% of SIZ was degraded within 20 min. The k obs was in the order of γ-MnO 2 @Co 3 O 4 (0.3952 min −1 ) > α-MnO 2 @Co 3 O 4 (0.1573 min −1 ) > β-MnO 2 @Co 3 O 4 (0.1536 min −1 ) > δ-MnO 2 @Co 3 O 4 (0.1319 min −1 ). Obviously, the synergy of Co 3 O 4 and MnO 2 weakened the differences of catalytic performance of MnO 2 caused by their microstructures among α, β, and δ-MnO 2 . Due to its large surface area, γ-MnO 2 @Co 3 O 4 exhibited the most excellent catalytic performance for the SIZ removal. All the hybrids also displayed superior stability and reusability, and the degradation rates of SIZ maintained were above 97% during five consecutive cycles. The reactive oxygen species (ROS) including SO 4 •− , • OH, and 1 O 2 were responsible for the SIZ degradation in the system of MnO 2 @Co 3 O 4 /PMS, which was confirmed by electron paramagnetic resonance (EPR) technique and scavenger tests. Twelve intermediates of the SIZ degradation were identified via HPLC-TOF-MS 2 . Combined with the results of characterizations together with ROS identification, the possible catalytic mechanisms and pathways of the SIZ degradation were proposed. This study may shed some light toward the application of different crystallographic MnO 2 hybridized with other transition metals in PMS activation .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Minxuan Huang,Shaopeng Wang,Hao Fu,Hongyun Shao,Yinghui Wang,Kefu Yu,Yilin Huang,Zhiping Jv,Liwei Wang
For widely used semiconductor-based chemoresistive sensors, low sensitivity and poor anti-interference in the complex environment (humidity resistance, etc. ) are two main constraints of application. To enhance the sensitivity, many effective strategies have been developed such as constructing heterostructures with synergistic effects, introducing abundant oxygen vacancies as active sites, designing hollow/cavity structure to increase surface area to facilitate target gas adsorption, and so on. Besides, the interference caused by water vapor can be blocked. via MOF or molecular sieve membranes but is accompanied with the shielding of some target molecules. The above methods are faced with the problems of complex process, large workload of material screening and failure to maintain the device stability. Hence, an effective vapor-phase method derived N-C@SnO 2 -Co 3 O 4 complex that combined the hydrophobicity , acetone selectivity, p-n heterostructure with mesoporous hollow characteristics was proposed, named mesoporous N-C@SnO 2 -Co 3 O 4 hollow nanoboxes (HNBs). Particularly, the chemoresistive sensor based on N-C@SnO 2 -Co 3 O 4 HNBs (2.0%) showed satisfactory selectivity to acetone vapor at relatively low working temperature (160 °C), and the response remained stable even under high humidity (with the R.H. of 90%). Impressively, a three-fold enhancement in response signal was observed for the sensor based on N-C@SnO 2 -Co 3 O 4 HNBs when compared with its counterpart of SnO 2 -Co 3 O 4 , which can be ascribed to the consequent unpaired electrons from oxygen vacancies and hollow mesoporous structures. Additionally, a sensing prototype based on the N-C@SnO 2 -Co 3 O 4 HNBs was practically fabricated. The satisfactory sensing response and stability further verified the potential applications in industrial acetone detection. This facile vapor-phase approach sheds light on designing sensing materials with enhanced sensitivity and humidity resistance, as well as device stability simultaneously.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 40
·14435-14442
·
IF 4
Qihao Wu,Tao Xie,Li Zhang,Hui Ding,Heju Gao,Jiahui Jiang,Guancheng Xu
To achieve broad commercialization of rechargeable metal–air batteries, the development of non-precious metal-based bi-functional oxygen electrocatalysts is critical. In this study, we prepared N,S co-doped porous carbon materials containing Co9S8 nanoparticles (Co9S8/NSC) through a one-step pyrolysis process. The process involved the pyrolysis of a polydopamine (PDA) coated Co-formic acid framework (Co-FF) derived Co3O4 and thiourea. The improved catalyst Co9S8/NSC-1 exhibited satisfactory long-term durability and superior oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity, the half-wave potential (E1/2) of the ORR reached 0.83 V, and the OER overpotential at 10 mA cm−2 (η10) was 300 mV. The zinc–air battery (ZAB) based on Co9S8/NSC-1 assembly had a maximum power density of 102.0 mW cm−2 and the cycle life reached 500 cycles. The material preparation method was simple, environmentally friendly and inexpensive, providing a feasible strategy for the development of non-precious metal-based electrocatalysts.
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高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Tianyu Gao,Yongxuan Yin,Guanghui Zhu,Qiue Cao,Wenhao Fang
Oxidative transformations of HMF are key routes toward a wide variety of chemicals and biofuels through an environmental friendly process. Co 3 O 4 NPs decorated Mn-Co-O solid solution, donated as Co 3 O 4 /Mn X Co, was prepared by co-precipitation method and used as non-precious metal catalyst for base-free oxidation of HMF to FDCA in the presence of O 2 and water. Comprehensive characterizations such as XRD, H 2 -TPR, O 2 -TPD, XPS, NH 3 /CO 2 -TPD and TEM were used to study materials properties especially the oxygen mobility and acidity-basicity. The effect of Mn/Co molar ratio in catalyst and the reaction conditions were investigated and optimized. In addition, the kinetics of the reaction was monitored to reveal the reaction route and rate-determining step. The variation of Mn/Co molar ratio was found to affect not only HMF conversion but also distribution of products. When the Mn/Co ratio was of 0.2, the Co 3 O 4 /Mn 0.2 Co catalyst showed the optimal catalytic performance (i.e., >99% yield of FDCA obtained under 1 bar O 2 at 140 °C after 24 h) due to the highest content of both Lewis and Brønsted acid sites on the surface, leading to the strongest ability of HMF adsorption and COOH group formation, as well as the enhanced oxygen mobility. This catalyst was shown stable after a minor deactivation (≤8%) during six recycling uses and its activity can be entirely regenerated by calcination in air.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dongdong Fan,Meihua Hu,Songyuan Li,Pinghua Chen,Hualin Jiang,Xinman Tu,Xibao Li,Xubiao Luo
The efficient activation of peroxymonosulfate for degrading emerging contaminants has become a focal point in recent decades, emphasizing the development of novel materials and efficient strategies for high-performance degradation. This study explores a spatial confinement strategy, where TiO 2 is confined inside carbon nanotubes with Co 3 O 4 loading outside, is performed to prepare the nano-confined composite TiO 2 -in-CNT/Co 3 O 4 . Norfloxacin is chosen as the primary target pollutant, revealing a degradation rate exceeding 97 % within 30 min. The non-radical 1 O 2 species were confirmed to be generated in nano-confined catalyst, but not observed in the control non-confined catalyst. Additionally, the quantity of original radical active species significantly increases in nano-confined catalyst compared to non-confined catalyst. TiO 2 -in-CNT/Co 3 O 4 has excellent reusability and application universality. Wonderful stability is observed in real water and anti-ion interference experiments, highlighting its robust stability. Experimental and DFT calculation results also demonstrate that the spatial confinement strategy prevents nanoparticle aggregation, accelerates electron transfer efficiency, and promotes the cycling of Co 2+ /Co 3+ electron pairs. This work provides insights into the regulation of confined effects in activating PMS and offers a feasible strategy for the synergistic activation of PMS for water environment remediation through a radical and non-radical mixed mechanism.
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高影响因子
危险品化学品经营许可证（带存储）