CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Wei Zheng,Peigen Zhang,Li Yang,Jian Chen,Wubian Tian,Yamei Zhang,ZhengMing Sun
We report herein a fast and scalable approach to the synthesis of MO/CNT/Fe (MCI) hybrid nanostructures via microwave irradiation of MXene under ambient condition. The effect of three arcing materials, CNT, graphite (C), and carbon fiber (C f ), on the growth of carbon nanotubes on MXene-derived metal oxides were investigated. The resulted MCI nanostructures were tested as anodes in LIBs , all exhibiting better electrochemical performance than that of pristine Ti 3 C 2 . Remarkably, MCI-C f delivered reversible capacities of 430 mA h g −1 and 175 mA h g −1 at 1 A g −1 and 10 A g −1 , respectively, which is much higher than that of commercial graphite at high rates. The findings in this work open new exciting opportunities to developing hybrid electrode materials with high specific capacity for energy conversion and storage.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yingfang Zhu,Sihao Wang,Qingyu Luo,Haifu Huang,Shaolong Tang,Youwei Du
Developing electrocatalysts with high-Pt-utilization efficiency and appropriate surface oxygen affinity through a facile and scalable route is urgently needed for proton exchange membrane fuel cells. Here, SPD-annealing strategy is demonstrated to prepare ordered low-Pt-loading Pd–Pt–Fe nanoalloys with an average particle size of less than 5 nm and excellent electrocatalytic performance. Furthermore, the ORR performances of Pd–Pt–Fe/C nanoalloy catalysts are rationally modified by means of both precise composition control and structural transformation. With an optimal component proportion, the prepared Pd 0 . 75 Pt 0 . 25 Fe/C catalyst exhibits the most excellent intrinsic activity due to the synergistic interaction of lattice strain and ligand effect. Benefiting from the compressive strain effect induced by the relatively tight arrangement of the ordered structure, the adsorption energy of the intermediate oxygen-containing species is effectively weakened, enabling the Pd 0 . 75 Pt 0 . 25 Fe/C to obtain enhanced ORR catalytic performance in acidic condition. Notably, compared with the disordered Pd 0 . 75 Pt 0 . 25 Fe/C, the ordered Pd 0 . 75 Pt 0 . 25 Fe/C shows an extremely superior stability of 98.5% mass activity retention after 10 000 cycles. This work could provide a facile and versatile approach to constructing the ordered low-platinum electrocatalysts with enhanced ORR properties.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Shanhai Zhao,Chunhe Li,Kuankuan Ren,Zebo Fang,Ping Fang,Yanyan Zhu,Pengfei Fang
Photothermal catalytic CO 2 reduction is an attractive way to alleviate the current energy crisis, but it is important to prepare catalysts with efficient catalytic capacity. In this work, Prussian blue analogs were firstly prepared, and then calcined to obtain porous transition metal (Ni, Co, Fe) oxides (TMOs). The metal composition of catalysts has great influences on their structures and catalytic properties. Among them, NCF-TMO catalyst shows excellent photothermal catalytic performance, and can produce 2.9 mmol g -1 h -1 CO and 1.6 mmol g -1 h -1 mmol CH 4 at low CO 2 and H 2 concentrations. For the NCF-TMO, its superior catalytic performance mainly benefitted from two reasons: (1) The construction of heterojunction between NiO, Co 3 O 4 and Fe 2 O 3 , which promotes the efficient dynamic processes of charge carriers; (2) The formation of abundant surface reactive active sites facilitates the efficient conversion of CO 2 molecules. This study offers a bright direction for the resource utilization of CO 2 .
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Luping Feng,Lixiang Zhang,Su Chu,Sheng Zhang,Xi Chen,Zhongling Du,Yushuang Gong,Hua Wang
MoS 2 nanosheets were doped with Fe elements simply via the one-pot hydrothermal route resulting in the peroxidase-like nanozymes with dramatically enhanced catalysis. It was discovered that the resulted Fe-MoS 2 could display controllable catalysis activities depending on the Mo-to-Fe molar ratios, among which the highest one was achieved at 3/1 with catalysis efficiency over three folds higher than that of pristine MoS 2 . The greatly improved catalysis performances of Fe-MoS 2 nanozyme are thought to be resulted from the synergistic effects of the doped Fe atom and Mo-S sites. On the one hand, herein, the Fe sites might serve as the electron transferring mediators to facilitate the peroxidase-like catalytic reactions, as confirmed by the cytochrome C -based electron transportation experiments. On the other hand, the Mo-S sites might conduct the catalytic behavior of Fenton-like reactions, as revealed by the hydroxyl radicals-capturing experiments. Furthermore, the feasibility of practical applications for the developed Fe-MoS 2 nanozyme based colorimetric methods was demonstrated for glucose in blood sample. Importantly, an insight can be thereby obtained into the design of different nanozymes with enhanced catalysis designed by doping heteroatoms like Fe, promising for the catalysis-based applications in the biomedical analysis, food safety, and environmental monitoring fields.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Yuting Zhong,Zhirui Wu,Xiaoguang Liu,Ling Li
The combination of multi-metallic alloys and support materials is a promising approach for the design of electrocatalysts. In this study, Pd-M (M = Fe, Sb, Pb, Sn, Ag) bimetallic alloys embedded composites of 2D Ca-based metal–organic framework (Ca-MOF) nanosheets and reduced graphene oxide (rGO) were fabricated by a facile hydrothermal and impregnation reduction method, then applied as ethylene glycol oxidation reaction (EGOR) electrocatalysts. Remarkably, the forward peak current density of the best catalytic performer PdAg@rGO/Ca-MOF is as high as 258.30 mA cm −2 , which is 9.55 times greater than that of Pd/C. It also exhibits the biggest electrochemical active surface area of 3022.51 m 2 g −1 . After 3600 s chronoamperometry test, the retained current density of PdAg@rGO/Ca-MOF is about 87.94 % of the initial current density. These results imply that bimetallic Pd-M@rGO/Ca-MOF have superior electrocatalytic activity and anti-CO poisoning capacity compared to monometallic and Pd/C for EGOR, especially PdAg@rGO/Ca-MOF. The enhanced EGOR performance is due to the combined effect of Pd-M alloys and folded thin layer wrapped nanosheet rGO/Ca-MOF composites.
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Foods
·
2021
·Vol. 10
·期 2
·419
·
IF 4.35
Pei Hu,Zhentao Sun,Yunwen Shen,Yiwen Pan
Hydrogen peroxide (H2O2) has been reported to be used for the illegal treatment of fishery products in order to obtain “fake” freshness. Residues of H2O2in food may be of toxicology concern. In this study, a nonenzymatic sensor was developed based on Fe@PCN-224 metal–organic frameworks wrapped by Nafion to detect H2O2concentration. The hybrid structure of Fe@PCN-224 was fabricated by incorporated free FeIIIions into the center of PCN-224, which was ultra-stable due to the strong interactions between Zr6and the carboxyl group. Scanning electron spectroscopy images exhibited that Nafion sheets crossed together on the surface of Fe@PCN-224 nanoparticles to form a hierarchical and coherent structure for efficient electron transfer. Electrochemical investigations showed that the Fe@PCN-224/Nafion/GCE possessed good linearity from 2 to 13,000 μM (including four orders of magnitude), low detection limits (0.7 μM), high stability in continuous monitoring (current remained nearly stable over 2300 s) and in long-term measurement (current decreased 3.4% for 30 days). The prepared nanohybrid modified electrode was effectively applied to H2O2detection in three different fishery products. The results were comparable to those measured using photometrical methods. The developed electrochemical method has a great potential in detecting the illegal management of fishery products with H2O2.Keywords:Fe@PCN-224;Nafion;nonenzymatic sensor;hydrogen peroxide;fishery products
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PubMed
高影响因子
Catalysts
·
2019
·Vol. 9
·期 12
·1061
·
IF 3.444
Zhenhua Dong,Pengwei Gao,Yongmei Xiao,Jing Chen,Wentao Wang
We reveal the Suzuki–Miyaura reaction catalyzed by a Pd–Co nanocatalyst supported by Mg–Fe–CHT (calcined hydrotalcites). A variety of boronic acids and aryl halides were transformed into functionalized biphenyls in excellent yields using water as a solvent. The reaction could proceed under mild conditions with a simple operation and high turnover numbers. The excellent catalytic activities are reasonably attributed to the Co-doping, which forms a Pd–Co alloy on the surface of CHT.Keywords:Suzuki–Miyaura reaction;water solvent;nanocatalyst;palladium;cobalt
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Weixuan Wu,Weiqi Feng,Jingyu Bao,Xin Yang,Zhongfeng Shi,Jianmin Chen,Liqin Zhou,Zhenxia Zhao,Zhongxing Zhao
High detection stability makes sarcosine oxidase (SOx) nanozyme as natural enzyme substitute, a promising sensor for prostate cancer biomarker Sarcosine (Sar). However, its limited catalytic capacity towards product (H 2 O 2 ) and the following weak signal response significantly restrict the detection sensitivity of Sar. Herein, a novel NH 2 -MIL88B(Fe)-porphyrin/riboflavin (NM88B-POR/Rf) electrochemical sensor with a hyperoxia microenvironment and cascade reaction functions is proposed to promote catalytic H 2 O 2 production and cascade signal amplification (from H 2 O 2 to •OH). Fe-porphyrin implantation in NM88B-POR/Rf as bionic heme enhanced the O 2 -carrying capacity, thus effectively improving the sensor's utilization rate of dissolved oxygen and the catalytic H 2 O 2 production ability of Rf. Based on enzymatic cascade strategy, NM88B in NM88B-POR/Rf as peroxidase nanozyme further catalyzed H 2 O 2 to generate •OH. Methyl blue was used to capture •OH and enhance Sar detection sensitivity. Detection results revealed that NM88B-POR/Rf presented as low limit of detection (LOD) as 3.31 pM with detection range of 10 pM∼1 mM. The synergistic effect of the hyperoxia microenvironment and enzyme cascade make LOD about 4 orders of magnitude lower than reported state-of-the-art biosensors. Moreover, NM88B-POR/Rf has good selectivity and stability and hence also be applied to the detection of Sar in real urine.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
·
IF 2.196
Pan Liang,Jie Wang,Zhi-Hong Liu
A pure zinc borate, Zn[B 12 O 14 (OH) 10 ], has been synthesized and characterized by XRD, FT-IR, simultaneous TG-DTA techniques, and chemical analysis. The molar enthalpy of solution of Zn[B 12 O 14 (OH) 10 ] (s) in 1 mol·dm −3 HCl(aq) was measured by microcalorimeter at T = 298.15 K. The molar enthalpy of solution of ZnO(s) in the mixture solvent of 2.00 cm 3 of 1 mol·dm −3 HCl(aq) and calculated amount of H 3 BO 3 was also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpy of formation of −(9646.6 ± 9.6) kJ·mol −1 at T = 298.15 K was obtained on the basis of an appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −9492.7 kJ·mol −1 for [B 12 O 14 (OH) 10 ] 2− has also been estimated by a group contribution method, which has been used to predict the Δ f H m θ of a series of transition metal borates of M[B 12 O 14 (OH) 10 ] (M II = Mn, Zn, Fe, Co, Ni). These estimated data have been used to further compare the stability of this series of transition metal borates.
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ENERGY & FUELS
·
2022
·
IF 4.654
Jing Li,Suxia Ma,Rongji Cui,Nuo Xu,Ting Pei
Solid waste fly ash can encroach on land, contaminate the environment, and jeopardize human health. An alkali fusion method combined with a hydrothermal method was adopted to prepare fly ash-derived ZSM-5 molecular sieves, and a series of Fe/ZSM-5 catalysts were also prepared to test their catalytic performance in NO oxidation with H2O2. Moreover, the characteristics of catalysts synthesized by fly ash, as well as the relationship between the structure and the catalytic activity, were analyzed in detail through multiple characterization approaches. The results gave important insights into the active sites of catalytic oxidation. They concluded that 10% Fe/ZSM-5 had the best catalytic activity in which Fe sites and Brønsted acid sites collectively provided the catalytic functionality, and 92% NO removal efficiency was obtained achieved under optimal experimental conditions. This work provided a new way for recycling fly ash and developing low-cost catalysts for NO removal.
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Journal of Water Process Engineering
·
2023
·
IF 7
Guobin Li,Zhenbang Han,Tao Wang,Minghui Zhang,Qiaoqiao Liu,Tong Zhang,Xiaoming Zhao
Fe-doped graphitic carbon nitride (g-C 3 N 4 ) represents an attractive photo-Fenton catalyst for organic contaminants removal, but the practical performances still need to be improved for large-scale application. Herein, we developed a high-efficiency photo-Fenton catalyst by anchoring Fe-g-C 3 N 4 onto an amidoxime-functionalized polyacrylonitrile fiber (AP) substrate through a simple hydrothermal approach. Comprehensive characterizations demonstrate the strong catalyst-support interaction via the axial coordination bonding between -OH groups and Fe 3+ , which could induce electric polarization of Fe-g-C 3 N 4 to promote the H 2 O 2 adsorption and activation. The fibrous support could also accelerate the photoelectrons transfer from g-C 3 N 4 to Fe 3+ by strengthening the d-π conjugated large π bond, as well as alleviate the backflow recombination from Fe 3+ to g-C 3 N 4 through the electron sink effect. These synergistic qualities resulted in superior photo-Fenton performance for organic contaminants removal, which delivered 4.0-fold higher degradation kinetics than that of the Fe doped g-C 3 N 4 powder catalyst and exhibited unexpected high activity at strong basic environment (pH = 12). Our work demonstrates an ingenious and simple way to design exceptional photo-Fenton catalysts for environmental remediation.
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WATER RESEARCH
·
2024
·
IF 11.4
Zhaobin Liu,Shiliang Heng,Qicai Dai,Yijing Gao,Yule Han,Lingtian Hu,Yisheng Liu,Xueqin Lu,Guangyin Zhen
Waste activated sludge properties vary widely with different regions due to the difference in living standards and geographical distribution, making a big challenge to developing a universally effective sludge dewatering technique. The Fe(II)-activated persulfate (S 2 O 8 2− ) oxidation process shows excellent ability to disrupt sludge cells and extracellular polymeric substances (EPS), and release bound water from sludge flocs. In this study, the discrepancies in the physicochemical characteristics of sludge samples from seven representative cities in China (e.g., dewaterability, EPS composition, surface charge, microbial community, relative abundance of antibiotic resistance genes (ARGs), etc.) were investigated, and the role of Fe(II)-S 2 O 8 2− oxidation in enhancing removal of antibiotic resistance genes and dewatering ability were explored. The results showed significant differences between the EPS distribution and chemical composition of sludge samples due to different treatment processes, effluent sources, and regions. The Fe(II)-S 2 O 8 2− oxidation pretreatment had a good enhancement of sludge dewatering capacity (up to 76 %). Microbial analysis showed that the microbial community in each sludge varied significantly depending on the types of wastewater, the wastewater treatment processes, and the regions, but Fe(II)-S 2 O 8 2− oxidation was able to attack and rupture the sludge zoogloea indiscriminately. Genetic analysis further showed that a considerable number of ARGs were detected in all of these sludge samples and that Fe(II)-S 2 O 8 2− oxidation was effective in removing ARGs by higher than 90 %. The highly active radicals (e.g., SO 4 − ·, ·OH) produced in this process caused drastic damage to sludge microbial cells and DNA stability while liberating the EPS/cell-bound water. Co-occurrence network analysis highlighted a positive correlation between population distribution and ARGs abundance, while variations in microbial communities were linked to regional differences in living standards and level of economic development. Despite these variations, the Fe(II)-S 2 O 8 2− oxidation consistently achieved excellent performance in both ARGs removal and sludge dewatering. The significant modularity of associations between different microbial communities also confirms its ability to reduce horizontal gene transfer (HGT) by scavenging microbes.
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PubMed
高影响因子
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