CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Li Liu,Yuxin Li,Wei Li,Yeqing Lan,Ying Li
In this study, CrPO 4 -supported Co 3 O 4 (CrPO 4 @Co 3 O 4 ) as an efficient peroxymonosulfate (PMS) catalyst was obtained for the first time and used to eliminate phenacetin (PNT) from aqueous solution efficiently. CrPO 4 @Co 3 O 4 composite exhibited a superb catalytic performance, and over 98% PNT was degraded by PMS (0.5 mM) within 15 min, which is much more efficient than in the systems of CrPO 4 /PMS and Co 3 O 4 /PMS. The excellent catalytic performance of CrPO 4 @Co 3 O 4 was attributed to its higher BET surface area. On the other hand, the presence of PO 4 3- in the catalyst might improve the conversion of Co(III) to Co(II). The latter served as the main active site for the PMS activation. CrPO 4 @Co 3 O 4 also possessed superior stability and reusability, and the removal rates of PNT remained over 91% through 4 cycle tests. Solution pH significantly impacted the PNT decomposition, and the optimal catalytic degradation of PNT was achieved in an initial range of 5 to 7. Humic acid, HCO 3 − , and Cl − inhibited PNT degradation. Radical scavenging experiments and EPR technology revealed that SO 4 •− free radicals were the main reactive oxygen species (ROS) responsible for PNT degradation. While O 2 •− mainly acted as the intermediate to form SO 4 •− and 1 O 2 . To assess the practical application of the CrPO 4 @Co 3 O 4 /PMS system, the PNT degradation was investigated in real lake water. Based on HPLC-TOF-MS 2 analysis, 14 intermediates were identified, and the degradation pathways were further inferred. Therefore, this study provides a feasible strategy for the valuable use of CrPO 4 as recycled material and a practical solution for the efficient degradation of organic contaminants.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xinyang Wang,Rui Li,Xinyu Luo,Jincheng Mu,Jianbiao Peng,Guangxuan Yan,Pengkun Wei,Zhenbang Tian,Zuohua Huang,Zhiguo Cao
Enhancing low-temperature activity is a focus for carbon monoxide (CO) elimination by catalytic oxidation. In this work, the hierarchical flower-like silver (Ag) modified cobalt oxides (Co 3 O 4 ) nanosheets were prepared by solvothermal method and applied into catalytic CO oxidation. The doped Ag species in the form of AgCoO 2 induced the prolongated surface Co–O bond and weaker bond intensity. Consequently, the oxygen activation/migration ability and redox capacity of Ag 0.02 Co were enhanced with more oxygen vacancies. The chemisorbed CO was preferentially converted to CO 2 but not carbonates. The inhibited carbonates accumulation could avoid the coverage of active sites. According to Density functional theory (DFT) calculations, the electron transfer from AgCoO 2 to Co 3 O 4 promote electron donation ability of Co 3 O 4 layer, benefiting for oxygen activation. Moreover, the longer Co–C and C–O bond length suggest the weakened chemisorption strength and higher active of CO molecule. The Ag modified Co 3 O 4 exhibited more satisfactory activity at lower temperature. Typically, it realized 100% CO conversion at 90 °C, and displayed 6.3-fold higher reaction rate than pristine Co 3 O 4 at 40 °C. Moreover, the Ag 0.02 Co exhibited outstanding long-term stability and water resistance. In summary, the optimized oxygen activation, CO chemisorption and interfacial electron transfer synergistically boosted the CO oxidation activity on Ag modified Co 3 O 4 .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shifeng Tan,Meiling Fan,Wenmao Tu,Duxin Zhang,Qi Li,Ziyi Xu,Xiaoyu Yang,Hongfei Pan,Haining Zhang
Development of a simple method for synthesizing transition metal-based bifunctional catalysts is of great importance in the context of oxygen-involved electrochemical energy conversion and storage devices. In this effort, electrochemical catalysts consisting of amorphous cobalt and cobalt oxides on graphene oxide (GO) were fabricated using a solvothermal process followed by etching ZIF-67 with oxygen-rich functional groups on GO (≈ 29 at. %) in a weak reduction atmosphere at 400 ℃. During the calcination process forming the ZIF-67@GO-based materials, exposed cobalt metal centers are created by partial vaporization and oxidation of ZIF-67. Also, metal ions are reduced to form Co and partially combine with oxygen from GO to generate amorphous Co 3 O 4 . Moreover, the porous framework structure of ZIF is retained under the mild calcination temperatures used. Benefiting from their porous framework and heteroatoms-doped composition, the ZIF-67@GO-based materials have low overpotentials of 319 mV at 10 mA cm −2 and high catalytic activities toward the oxygen evolution and oxygen reduction reactions in an alkaline electrolyte. In addition, the liquid zinc-air battery assembled with the ZIF-67@GO composite produced at a calcination temperature of 400 ℃ displays a high performance. Overall, the results demonstrate that the ZIF-67@GO composites have the potential to be high-performing catalysts in energy conversion devices. The readily controllable and high-yielding calcination method in this study is expected to serve as a model for new strategies to synthesize low-cost and efficient bifunctional electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Kai Wang,Xiaoyan Lu,Dedong Wu,Pengfei Xiao
The development of a new catalyst is of great significance for the potential application of advanced oxidation processes using sulfites as the sources of sulfate radical. In this study, a novel composite catalytic material, Li 3 PO 4 -Co 3 O 4 , was synthesized to activate sulfite to degrade metronidazole (MNZ) in water. Characterization techniques were used to characterize the prepared materials. The key factors affecting the degradation of MNZ, including molar ratio of Li 3 PO 4 and Co 3 O 4 , catalyst dosage, sulfite concentration, pollutant concentration and initial pH, were investigated. Under the optimal experimental conditions, the degradation rate of MNZ can reach 94% within 30 min. The effects of ions on the degradation of MNZ in water were investigated. The XPS test showed that Li 3 PO 4 could increase the content of oxygen vacancy on the catalyst surface to enhance the activation performance, and the conversion between Co 2+ and Co 3+ was the key factor for the activation of sulfite. By electron paramagnetic resonance detection and reactive oxygen species (ROS) clearance experiments, it was concluded that the main ROS in Li 3 PO 4 -Co 3 O 4 /S(IV) system were SO 4 •− and • OH, and the production and transformation mechanisms of SO 4 •− and • OH were fully revealed and demonstrated. MNZ is degraded into multiple intermediate products through two pathways, which are ultimately mineralized into inorganic small molecules. The toxicity analysis of the intermediate products indicate that the system has a strong detoxification effect on MNZ. In addition, the catalyst has good reusability and low metal ion leaching characteristics, indicating that the catalytic system has good practical application potential.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Feng Zhou,Jiadong Chen,Yun Yang,Xiaofeng Ke,Xue Liu,Lijie Zhang,Jun Li,Huile Jin,Shun Wang,Ying Li,Chenliang Su
Development of Ru-based electrocatalysts for acidic oxygen evolution reaction without a trade-off between activity and durability remains challenging. Herein, we constructed Co 3 O 4 /RuO 2 heterojunctions anchored on carbon (Co 3 O 4 /RuO 2 -C) with a low Ru loading (2.74 wt%), in which strong coupled p-n junctions facilitated electron transfer from RuO 2 to Co 3 O 4 . The Co 3 O 4 /RuO 2 -C demonstrated a low overpotential of 170 mV at 10 mA cm −2 and long-term stability in 0.1 M HClO 4 due to its unique structure. The origin of its high performance in acidic OER was revealed by the combination of in-situ attenuated total reflection infrared and Raman tests. Concretely, oxygen generation for Co 3 O 4 /RuO 2 -C was dominated by the adsorbate evolution mechanism, and the introduction of Co 3 O 4 facilitated the redox of RuO 2 , generating active sites for OER. Theoretical calculations further substantiated that the Co 3 O 4 /RuO 2 heterojunctions possessed lower energy barriers for OER. This work provides a compelling synthesis route for effective and stable electrocatalysts for acidic OER.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Haitao Li,Qiang Gao,Guanshuai Wang,Bo Han,Kaisheng Xia,Jinping Wu,Chenggang Zhou,Jun Dong
Herein, we reported postsynthetic incorporation of generally believed catalytically inert Al 3+ ion into the lattice of commercial Co 3 O 4 to form a series of Al doped Co 3 O 4 (ACO) catalysts, and demonstrated that the Al incorporation with suitable concentration could induce a surprising boost in activation of peroxymonosulfate (PMS). Unlike conventional direct synthesis that might lead to the formation of bimetallic spinel oxides in an uncontrollable manner, the presented method could produce ACO catalysts with almost unchanged particle size and morphology, which was beneficial for a reliable assess on the composition-dependent catalytic performance to avoid possible misjudgment caused by other factors. More importantly, the Al incorporation could not only promote the adsorption affinity and electron transfer ability of Co to PMS but also facilitate the O O bond cleavage of the adsorbed PMS, thereby leading to an enhanced catalytic ability. As a result, the optimal ACO (Co 2.98 Al 0.02 O 4 ) exhibited a high degradation efficiency with a rate constant (0.127 min −1 ) 2.6-folds that of pure Co 3 O 4 (0.049 min −1 ) in PMS activation for degradation of metronidazole (MNZ). Besides, Co 2.98 Al 0.02 O 4 manifested low cobalt leaching (≤79 μg L –1 ). Both degradation pathway and catalytic mechanism were proposed comprehensively, and the superb reusability of Co 2.98 Al 0.02 O 4 was also confirmed. This study enriches the current synthesis methodology for bimetallic spinel oxides and provides new insights into inert metal-promoted heterogeneous cobalt-based catalysis for robust advanced oxidation processes.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jiawei Long,Tianli Han,Mengfei Zhu,Xiaoyong Xu,Jinjin Li,Junjie Niu,Jinyun Liu
Lithium-sulfur battery cathodes still remain a challenge on capacity decay due to the shuttle effect even though a series of strategies have been tried. Here we report a novel matryoshka-like CuS@void@Co 3 O 4 architecture of double micro-cubes ( μ -cubes) that locks sulfur between the CuS core and the Co 3 O 4 shell. Plenty of existing spaces between the μ -cubes suffice a high loading of sulfur and volumetric accommodation. The robust, double closed cubes configuration greatly enhances the confinement of polysulfides . In parallel, the CuS core increases the electronic conductivity and contributes to additional capacity, while the Co 3 O 4 shell ensures a better interface activity. A high Li + ion diffusion coefficient is obtained during the sulfur and lithium sulfide transformation. The constructed battery displays an initial capacity up to 1480 mAh g −1 , and a Coulombic efficiency (CE) exceeding 99%. A capacity retention higher than 500 mAh g −1 with a CE larger than 99.8% after cycling 400 times at 0.2 C are achieved. In addition, under a temperature of −5 °C, a high capacity of 700 mAh g −1 at 0.2 C after 200 cycles is achieved, indicating a good low-temperature tolerance.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xurong Qiao,Chao Ma,Xiao Chang,Xiaofang Li,Kun Li,Lei Zhu,Fujun Xia,Qingzhong Xue
One-dimensional cobalt oxide (Co 3 O 4 ) exhibits great potential in gas sensing, but the application is severely hindered because of the agglomeration or close packing during the normal synthesis process. Herein, 3D radial Co 3 O 4 assembled with nanorods is fabricated by employing cobalt-based layered hydroxide metal salt (Co-LHMS) as a self-template. Meanwhile, Co 3 O 4 with flake floral and dumbbell radial structure obtained by tuning the hydrothermal reaction time of precursors is used as a control group for gas sensing tests. The sensitivity of 3D radial Co 3 O 4 to sub-ppm acetone is 4 times higher than other structures and the detection limit is 100 ppb at a relatively low working temperature of 200 ℃, which is excellent among intrinsic acetone sensors based on pure Co 3 O 4 . The satisfactory gas sensing performance can be ascribed to the large specific surface, numerous transmission pathways, and low grain boundary resistance of the material. Furthermore, this work provides an idea for the further improvement of one-dimensional gas sensors.
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2020
·Vol. 146
·期 2
·605-611
·
IF 3.978
Jie Lv,Cong Zhang,Shuangling Wang,Meng Li,Wei Guo
Sensitive detection of copper ions (Cu2+) in biological samples is extremely important since an abnormal level of Cu2+ is linked with many diseases. Herein, we demonstrated a novel turn-on colorimetric sensor for selective detection of Cu2+ both in buffered solution and serum samples based on porous bimetallic transition metal oxide nanocages (ZnO-Co3O4 NCs) as peroxidase mimics. The ZnO-Co3O4 NCs were prepared by using ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) as precursors via direct calcination. With the high peroxidase-like activity, the obtained ZnO-Co3O4 NCs can catalyze the oxidation of tetramethylbenzidine (TMB) in the presence of H2O2 to form a blue colored product. The inhibition effect of cysteine (Cys) on the catalytic activity of ZnO-Co3O4 NCs and its strong binding ability toward Cu2+ enabled the ZnO-Co3O4 NCs/Cys system to be utilized for sensitive detection of Cu2+, in which the catalytic activity of ZnO-Co3O4 NCs/Cys can be recovered by the introduction of Cu2+ with an obvious color change of the solution. The linear range for Cu2+ determination was 2 to 100 nM with a detection limit of 1.08 nM. More importantly, this colorimetric sensor has been successfully applied to detect Cu2+ in serum without pretreatment. Our findings are expected to expand the scope of application of nanozyme and shed light on early disease diagnosis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Ziyin Yang,Xiao Bai
This paper reports the synthesis of S-doped thin Co 3 O 4 shell with Au flower as core for nonenzymatic glucose sensing, where Au@Co 3 O 4 was obtained through assembly process triggered by redox reaction of Co 2+ and Au 3+ , and then S was doped into Co 3 O 4 shell via a hydrothermal process. The morphology, composition and structure of Au@Co 3 O 4 -S were characterized by transmission electron microscopy and X-ray diffraction, which showed that the core–shell structure was composed with Au core flower and S-doped thin Co 3 O 4 shell. Electrochemical property of Au@Co 3 O 4 -S toward glucose was explored, and an excellent electrocatalytic performance with a wide linear range of 0.2 μM–3.1 mM, a high sensitivity of 1127.3 μA mM −1 cm −2 and a low detection limit of 0.09 μM (S/N = 3) was obtained, which may be due to that the low conductivity of Co 3 O 4 was mitigated by conductive Au core flower and S doping, therefore making thin Co 3 O 4 shell provide more effective active sites for glucose reaction. Considering such excellent results, Au@Co 3 O 4 -S was proven as a promising material for electrochemical sensing of glucose.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Li Liu,Yunong Li,Wei Li,Ruixue Zhong,Yeqing Lan,Jing Guo
Co 3 O 4 –SnO 2 /rice straw biochar (RSBC) was prepared for the first time via calcining oxalate precipitation precursor dispersed on the surface of RSBC and used as a catalyst for activating PMS to degrade sulfisoxazole (SIZ). The results demonstrated that Co 3 O 4 –SnO 2 /RSBC possessed much better catalytic performance than Co 3 O 4 , Co 3 O 4 –SnO 2 , Co 3 O 4 /RSBC, and SnO 2 /RSBC, which is ascribed to the synergy of Co 3 O 4 , SnO 2 and RSBC. Approximately 98% of SIZ (50 mg/L) was decomposed by PMS (1 mmol/L) activated with Co 3 O 4 –SnO 2 /RSBC (0.1 g/L) within 5 min. The optimal degradation efficiency of SIZ was realized at the initial pH 9. Co 3 O 4 –SnO 2 /RSBC also displayed remarkable stability and reusability, and the degradation rate of SIZ maintained over 90% even after the fifth recycle run. The electron paramagnetic resonance (EPR) technique and quenching experiments proved singlet oxygen ( 1 O 2 ) to be the main reactive oxygen species (ROS) responsible for the SIZ decomposition in the Co 3 O 4 –SnO 2 /RSBC/PMS system. On the basis of the characterization analysis, the identification of the ROS and the SIZ degradation products , the possible mechanism and pathways of the SIZ degradation by a combination of PMS and Co 3 O 4 –SnO 2 /RSBC were further proposed. This study provides not only a new insight into non-radical mechanism for the heterogeneous activating PMS over Co 3 O 4 –SnO 2 /RSBC to degrade organic pollutants but also an eco-friendly synthetic route for exploring novel and efficient catalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·12091-12102
·
IF 3.553
Sheng Peng,Tao Shi,Gao Xiaorui,Tan Yongjian,Wu Dajun,Qian Bin,Chu Paul K.
Cobalt carbonate hydroxide possesses interesting capacitive properties due to the unique crystal structure. Herein, the hierarchical Co 3 O 4 @Co 2 (CO 3 )(OH) 2 dendritic structure was fabricated on carbon cloth with Co 3 O 4 nanoneedles as the inner core to enhance the conductivity. The loading efficiency of Co 2 (CO 3 )(OH) 2 nanowhiskers had improved obviously, and the nanowires provided more electrochemical sites to facilitate the superior electrochemical energy storage capacity of supercapacitor. The dendritic electrode with the core–shell structure had a high area-specific capacitance (1541 mF cm −2 at 1 mA cm −2 ), good rate capacitance (only 18.1% specific capacitance lost when the current density increased to 5 mA cm −2 ), as well as better electrochemical cycle stability (a capacitance retention of 72.1% after 5000 cycles at a high current density of 5 mA cm −2 ). The dendritic Co 3 O 4 @Co 2 (CO 3 )(OH) 2 and activated carbon as cathode and anode, respectively, were used to assemble an asymmetric supercapacitor, possessing the better area-specific capacitance of 87 mF cm −2 as well as well-deserved longevity retaining approximately 97.3% of initial capacitance even after 10,000 cycles at 1 mA cm −2 . The excellent properties stemmed from electro-active sites galore, strong adhesion between the core and shell, superior conductivity, as well as excellent ion transfer. The novel materials and feasible strategy are promising for next-generation hybrid supercapacitor with high performance.
✓ 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）