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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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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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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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
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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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 17
·17373-17382
·
IF 2.914
Liu Xuewei,Gao Minling,Qiu Weiwen,Khan Zulqarnain Haider,Liu Nengbin,Lin Lina,Song Zhengguo
In this study, a novel Fe–Mn–Ce oxide-modified biochar composite (FMCBC) was synthesized via pyrolysis to enhance the adsorption capacity of biochar (BC). Scanning electron microscopy-energy-dispersive X-ray spectroscopy confirmed that Fe, Mn, and Ce were successfully loaded onto the surface of the BC. A series of adsorption experiments showed that the FMCBC exhibited improved adsorption of As(III) in an aqueous environment. The adsorption process was well expressed by the pseudo-second-order kinetic model. The adsorption capacity of FMCBC reached 8.74 mg L −1 , which was 3.27 times greater than that of BC. The pH of the solution significantly influenced the adsorption of As(III), where the amount of As(III) adsorbed by FMCBC was maximized at pH 3. A high phosphate concentration inhibited adsorption, whereas nitrate and sulfate ions promoted As(III) adsorption and increased the FMCBC adsorption capacity. Similarly, with increasing humic acid concentration, the adsorption capacity of FMCBC for As(III) decreased; however, a low concentration of humic acid promoted adsorption. X-ray photoelectron spectroscopy analysis revealed that the adsorption of As(III) by FMCBC occurred through redox and surface complexation reactions. Therefore, FMCBC has excellent potential for purifying arsenic-contaminated water.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 33
·17246-17253
·
IF 14.511
Cong Ling,Xinyan Leng,Xiao-Jie Lu,Jing-Han Li,Zhengkun Yang,An-Wu Xu
The oxygen evolution reaction (OER) is a great crucial half-reaction in many energy conversion and storage techniques to alleviate the problems of the energy crisis and environmental pollution. However, the development of a low-cost and easy-to-prepare OER electrocatalyst with glorious performance and superior stability remains a huge challenge. Recently, metal–organic frameworks (MOFs) have attracted tremendous interest owing to their charming features including ultrafine porosity, rich active metal sites and tunable structures. However, most MOFs directly acting as electrocatalysts for the OER have intrinsic low electrical conductivity, poor electrochemical activities and short-term durability, hindering their practical application. Herein, we develop a facile and effective one-pot solvothermal method to rationally design a new S-doped Fe-based organic framework grown on nickel foam (NF), which prominently boosts the OER performance. Specifically, S0.05–Fe-BTB/NF exhibits remarkable OER activity with an ultralow overpotential of only 231 mV to afford 20 mA cm−2 current density without iR drop compensation in alkaline media, as well as a small Tafel slope of 41 mV dec−1, superior to that of the commercial RuO2 electrocatalyst. Particularly, it also demonstrates outstanding catalytic durability under an overpotential of 235 mV for 50 h. More significantly, the probable active species during the OER process are determined to be the electrochemically transformed metal oxyhydroxide.
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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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FIRE SAFETY JOURNAL
·
2022
·
IF 3.78
Qinyong Liu,Xingyu Chen,Guiyang Zhu,Xiaoyu Gu,Hongfei Li,Sheng Zhang,Jun Sun,Xiaodong Jin
A novel integrative supramolecular intumescent flame retardant was fabricated by self-assembly of melamine, p -aminobenzene sulfonic acid and phytic acid and was abbreviated as MAP. After chelation with Fe 3+ or Zn 2+ , the resulted products (MAP-Fe and MAP-Zn) were melt-blended with polylactic acid (PLA) to enhance the flame retardancy of PLA. The fire performance was characterized by limiting oxygen index (LOI), UL-94 vertical burning and cone calorimeter tests. The results showed that control PLA was flammable with a low LOI of 20.4%, and it cannot satisfy any UL-94 grade for its severe ignited dripping, whilst the incorporation of 3% MAP-Zn increased the LOI to 29.2％, upgraded the UL-94 rating to V-0, and reduced the peak heat release rate by 18.7%. It was proposed that MAP-Zn mainly promoted the formation of more graphitic carbon in the char residues . In addition, the presence of 3% MAP-Zn slightly reduced the tensile strength of PLA from 64.9 MPa of the control PLA to 60.1 MPa, which met the requirements of most practical applications.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jusheng Zheng,Kui Liang,Kaiyue Shi,Yechao Qiu
The irreversible capacity loss in the first cycle significantly reduces the specific capacity of lithium ion batteries. Cathode prelithiation is a common method to alleviate this problem. Here, Fe/Li2O were successfully prepared by in situ solid phase reaction method. Fe/Li2O as a cathode prelithiation additive has a high prelithiation specific capacity of 447.3 mAh g -1 during charging, and the first charge capacity of LiNi0.6Co0.2Mn0.2O2 with 7.5% Fe/Li2O additive could be enhanced by 9.1% and its cycling stability was improved from 86.9% to 90.2% after 70 cycles. The cathode prelithiation additive remarkably enhanced the content of active lithium during the initial delithiation process, contributing the formation of solid electrolyte interphase on the anode surface and better cycling stability. This easy-operating cathode prelithiation method could obtain evident effect of prelithiation and had good compatibility with existing lithium ion batteries.
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MATERIALS & DESIGN
·
2022
·
IF 9.417
Zhiming Hu,Caina Xu,Yonghao Liang,Taiyuan Liu,Huayu Tian,Yingchao Zhang
Compared with visceral cancers, breast cancer is epidermal and can be efficiently eliminated by photoacoustic imaging (PAI)-guided cancer therapy. In this study, we developed multifunctional nanoparticles (DMTH NPs) by loading doxorubicin (DOX) into MIL-100, which were modified with tannic acid (TA) and hyaluronic acid (HA) using a simple and convenient method. MIL-100 (Fe) in DMTH NPs allowed for chemodynamic therapy by converting endogenous hydrogen peroxide (H 2 O 2 ) into •OH through a Fenton-like reaction to assist DOX in killing cancer cells. DMTH NPs had high DOX loading efficiency for chemotherapeutic function and had the ability for photoacoustic imaging (PAI) and photothermal therapy (PTT) after being modified by TA. Specifically, DMTH NPs targeted tumors and had low toxicity in vivo . Ultimately, the released DOX and •OH cooperated in killing MCF-7 cells effectively in vitro . The enhanced and precise breast cancer treatment was achieved using a PAI-guided chemodynamic/chemo/photothermal synergistic therapy under laser irradiation in vivo . Overall, this work presented an innovative strategy for designing multifunctional nanoparticles for effective imaging-guided combination therapies to combat breast cancer.
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LANGMUIR
·
2022
·
IF 4.331
Rutong Song,Jun Yao,Mei Yang,Zhongbin Ye
Metal–organic frameworks (MOFs), especially Fe-MOFs, have shown prospective application in eliminating organic dyes from wastewater due to their well-developed pores, water stability, easy preparation, and economy. Herein, we synthesized four types of Fe-MOFs (such as MIL-88A, MIL-88B, MIL-100, and MIL-101) using the hydrothermal method. The products were analyzed with several methods. By comparing the adsorption effect of those four types of Fe-MOFs on three kinds of dyes, it has been shown that MIL-100 owns the best adsorption efficiency on cationic organic dyes methylene blue (MB) and Rhodamine B (RhB) in 180 min, while all MOFs have slight removal capacity on methyl orange (MO). MIL-100, as an adsorbent, was studied under various research conditions, and the maximum removal efficiencies to MB, RhB, and MO were found to be up to 97.36%, 88.75%, and 13.00%, respectively. Furthermore, cationic dye MB’s removal by MIL-100 was fitted with a pseudo-second-order model and Langmuir isotherm model (Qm = 411.041 mg/g) by adsorption kinetics and isotherms research, and MIL-100 could rapidly and selectively divide MB from a binary complex aqueous solution of MB and MO. The as-fabricated MIL-100 also exhibited excellent recyclability after four adsorption–desorption recycles and can be treated as a potential substance with high removal efficiency of cationic organic dye-containing industrial effluents.
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