Nano-Micro Letters
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2019
·Vol. 11
·期 1
·1-11
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IF 9.043
Tang Zeming,Zhao Yingxuan,Lai Qingxue,Zhong Jia,Liang Yanyu
Abstract A novel nonprecious metal material consisting of Co-embedded porous interconnected multichannel carbon nanofibers (Co/IMCCNFs) was rationally designed for oxygen reduction reaction (ORR) electrocatalysis. In the synthesis, ZnCo 2 O 4 was employed to form interconnected mesoporous channels and provide highly active Co 3 O 4 /Co core–shell nanoparticle-based sites for the ORR. The IMC structure with a large synergistic effect of the N and Co active sites provided fast ORR electrocatalysis kinetics. The Co/IMCCNFs exhibited a high half-wave potential of 0.82 V (vs. reversible hydrogen electrode) and excellent stability with a current retention up to 88% after 12,000 cycles in a current–time test, which is only 55% for 30 wt% Pt/C.
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Nanoscale
·
2021
·Vol. 13
·期 14
·6856-6862
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IF 7.79
Fan Yang,Chunzheng Wu,Hongbo Yu,Shiwei Wang,Tong Li,Bo Yan,Hongfeng Yin
Nanosized Au catalysts suffer from serious sintering problems during synthesis or catalytic reactions at high temperatures. In this work, we integrate dumbbell-shaped Au–Fe3O4 heterostructures into hollow ZrO2 nanocages to make Au–Fe2O3@ZrO2 yolk–shell nanoreactors with high activity as well as ultra-high sintering resistance for high-temperature CO oxidation. The synthesis starts with the fabrication of a (Au–Fe3O4)@SiO2@ZrO2 core–shell nanostructure with a Au–Fe3O4 dumbbell nanoparticle (DB) core and SiO2/ZrO2 double shells, followed by calcination and the selective removal of the inner SiO2 shell with alkaline solution to obtain Au–Fe2O3@ZrO2 nanoreactors. The retained ZrO2 hollow (outer) shells protect the Au NPs from aggregation at temperatures up to 900 °C and show excellent long-term stability. Compared to Au@ZrO2 yolk–shell nanoreactors, Au–Fe2O3@ZrO2 shows improved activity in CO oxidation due to the active Au–Fe2O3 interface. This strategy can be extended to other yolk–shell nanoreactors with various nanocomposites and for different catalytic reactions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
·
IF 3.764
Min Luo,Yu Bai,Rui Sun,Zhenhua Wang,Wang Sun,Peng Lin,Xian Dai,Kening Sun
Lithium–sulfur batteries are considered as one of the most potential energy storage devices in the future owing to their ideal theoretical energy density and specific capacity. However, the shuttle of soluble polysulfides and sluggish redox kinetics of polysulfides lead to insufficient use efficiency of active sulfur and the rapid capacity fading. In this study, novel Co-doped g-C3N4 (Co–CN) nanosheets are fabricated by a simple calcination process. The high discharge capacity of the commercial bulk S cathode with the Co–CN-modified separator is 1121 mAh g–1 at 0.2C with a satisfying rate performance of up to 3C. The Co–CN-modified separator also leads to excellent stability (640 mAh g–1 after 250 cycles) with high Coulombic efficiency of over 98%. At the sulfur mass loading of 3 mg cm–2, the cell can still deliver a discharge capacity of 719 mAh g–1 after 100 cycles with a high capacity retention of 95%. The improved performance can be attributed to the effective restriction of polysulfides shuttle due to the enhanced adsorption and catalytic conversion of polysulfides by the Co–CN nanosheet-modified separator. This work shares a simple and highly efficient strategy for increasing the performance of lithium–sulfur batteries.
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APPLIED CATALYSIS A-GENERAL
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2015
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IF 3.942
Li Yue,Guangci Li,Feng Zhang,Lei Chen,Xuebing Li,Xiang Huang
A series of CoMoO 4 hydrates composed of nanorods have been synthesized with different alcohol–water solvent systems, and the corresponding Co–Mo sulfides are obtained after sequential calcination and sulfurization. The characterization results show the change in solvent system can efficiently adjust the particle size of the Co–Mo precursors, while cannot affect their components and morphologies. Because of the different particle size, the specific surface areas (SSA) of the final Co–Mo sulfides are different. The particles with small size can lead to a high SSA that benefits the exposure and dispersion of active components, and further promote the incorporation of MoS 2 slabs with Co atoms to form “Co–Mo–S” structures on the surface of the sulfides. More “Co–Mo–S” structures would create more coordinative unsaturated sites with high activity in situ during hydrodesulfurization (HDS) reaction, resulting in a higher HDS activity. Among the Co–Mo sulfides, since S-m/w derived from methanol–water system possesses the smallest particle size and the most active sites, it naturally exhibits the highest HDS activity toward dibenzothiophene.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Haoying Wang,Jie Li,Huijie Shi,Siqi Xie,Chaojie Zhang,Guohua Zhao
Photoelectrocatalytic (PEC) reduction and removal of atrazine, one typical endocrine disruptor chemical, was achieved on Pd quantum dots modified TiO2 nanotubes (PdQDs@TiO2NTs) under regulating potentials. Compared with that on TiO2NTs, the PEC reduction efficiency of atrazine on PdQDs@TiO2NTs significantly increased, mainly attributed to the reduced electron transfer resistance, longer lifetime of the photogenerated electrons and the faster electron injection from the catalyst to atrazine in the solution. Meanwhile, PdQDs could also function as cocatalyst so that the electrocatalytic activity of PdQDs@TiO2NTs was evidently improved. Moreover, the investigation indicated that the applied potential not only played important role in accelerating the separation of photogenerated electrons and holes, but also with the increment of the cathodic potential, the PEC reduction mechanism of atrazine underwent the variation of electro-assisted photocatalysis, synergetic photoelectro-catalysis, and photoassisted electro-catalysis. A highest atrazine PEC reduction efficiency was achieved as 99.5% on PdQDs@TiO2NTs in about 5 h under the potential of −1.3 V vs. SCE, whereas the highest synergetic effect of photo- and electro- catalysis was achieved at a lower potential of −0.9 V vs. SCE.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Sehrish Mehdi,Yanyan Liu,Huijuan Wei,Hao Wen,Ruofan Shen,Zhikun Peng,Huanhuan Zhang,Xianli Wu,Chengming Wang,Shuyan Guan,Tao Liu,Baojun Li
Zeolitic imidazole framework (ZIF-67)-derived Co metal catalysts have gained attention as competitive catalysts due to their high metal loading and superior metal dispersion. However, the problems of Co cluster aggregation during use and difficulty in collection of the powder catalyst from the reaction system need to be solved. In this work, Co-based nanoparticles (NPs) are fabricated on a Ni foam. The monolithic catalyst, Co–NC/NF, has been prepared by the pyrolysis of the ZIF-67/NF precursor using manual coating. The characterization confirms the embedding and uniform distribution of Co NPs (10–20 nm) in the N-doped C matrix. The optimized Co–NC/NF600 reveals satisfactory catalytic activity upon hydrolysis of ammonia borane with a hydrogen evolution (rB = 1176 mL min–1 g–1Co), a turn over frequency (TOF = 180 h–1), and an apparent activation energy (Ea = 64 kJ mol–1). The catalytic activity of Co–NC/NF600 with Co and CoOx as active sites has the best rank among the previously reported Co monolithic catalysts. The superior stability and reusability of the catalyst with ∼ 90% retention after five uses are demonstrated under mild NH3BH3 hydrolysis conditions, originating from the high antiaggregation ability of the active sites and the easy recollection of the catalyst. The adopted novel strategy has the potential to synthesize monolithic catalysts applicable in other fields of heterogeneous catalysis in industrial applications such as energy storage and conversion.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Linxing Zhang,Jun Chen,Longlong Fan,Zhao Pan,Jiaou Wang,Kurash Ibrahim,Jianjun Tian,Xianran Xing
To settle the growing energy crisis, photovoltaic , as the renewable solar energy, based on ferroelectric oxides has recently attracted significant attention for the breakthrough in photovoltaic application. Herein, we deposited the ferroelectric Bi 0.925 Sm 0.075 Fe 0.95 Co 0.05 O 3 (BSFC) thin films on FTO glass substrates along with uniform microstructure and multi-orientation polycrystalline. The BSFC thin films possess good ferroelectric properties with a standard hysteresis loop attributed to Co-substitution. Intriguingly, an enhancement of both photocurrent (90.4%) and photovoltage (40.0%) in BSFC thin films has been observed, indicating that the ferroelectric polarization plays an important role in the bulk effect of ferroelectric photovoltaic. Furthermore, the Co-substitution induced an increasing trend in saturation magnetization of 6.2 emu/cm 3 in BSFC thin films. The enhancement of the multiferroics and photovoltaic properties facilitates its applications of energy conversion and information storage.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Yefei Wang,Fei Chang
The development of supported metal hydride catalysts with abundant active sites is a highly desirable yet challenging endeavor in ammonia synthesis. In this work, a lithium hydride (LiH)-loaded Fe/N-co-doped porous carbon (Fe-N-C) composite (LiH/Fe-N-C) was synthesized and demonstrated as an efficient catalyst for ammonia synthesis under mild conditions. The deposition of LiH onto Fe-N-C induced a partial reduction of the Fe-N moiety, resulting in the slight aggregation of isolated Fe single-atom sites into nanoparticles. Under reducing conditions (in the presence of H2), the coordinated nitrogen in Fe-N-C can be removed, forming nitrogen vacancies (VN), while surface iron hydride species (Fe-H) are generated through the interaction between LiH and Fe-N-C. The presence of Fe atoms adjacent to VN facilitates the adsorption and activation of dinitrogen, a process that is further supported by the replenishment of VN under reaction conditions. Notably, no lithium imide or amide species (Li2NH or LiNH2) — typically regarded as key intermediates in LiH-mediated ammonia synthesis, were observed on LiH/Fe-N-C, likely due to the fast hydrogenation step. Consequently, LiH/Fe-N-C achieves an ammonia production rate of 872 mmol·gFe-1·h-1, surpassing the performance of state-of-the-art Fe-based catalysts at 300 oC and 1 MPa. This study demonstrates that the synergistic catalysis of LiH, transition metals, and their adjacent nitrogen vacancies offers a promising pathway for efficient ammonia synthesis under mild conditions.
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Sustainable Energy & Fuels
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2025
·
IF 4.1
Yongheng Xiong,Yang Yu,Huangang Shi,Jifa Qu,Wenyi Tan
Single atom Fe sites, doped in CN materials, exhibit outstanding electrochemical activity for CO2-to-CO conversion. The pyrolysis of ZIF8 is a controllable method for fabricating isolated single atom metal sites. In this study, we propose a new strategy to increase the ratio of Fe in ZIF8 precursors by synergistically replacing Zn2+ with Bi3+ and Fe3+. After precursor pyrolysis, the obtained Bi/Fe–N–C catalysts, consisting of Bi sites and pyrrole-type Fe–Nx sites, serve as efficient electrocatalysts for the CO2RR. The results show that the optimized catalyst loaded with 94.8 mg per kgCat Fe exhibits a high FECO of >90.1% over a wide potential range of −0.4 to −0.7 VRHE (98.2% at −0.5 VRHE). Insights into the electrochemical reaction mechanism show that this successful design of Bi/Fe–N–C catalysts can provide a stable catalytic site to form *COOH, thus achieving energy-efficient electrochemical CO2 reduction to CO.
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POWDER TECHNOLOGY
·
2025
·
IF 4.6
Yuting Shang,Mingan Zou,Zhihong Zhao,Zhiyan Lai,Tao Liu
This study established a top-down methodology for nano-amorphous rutin production, with systematic evaluation of amorphous state effects (polymer-based vs. small molecule-based) on both manufacturing processes and microneedle formulations. Experimental data coupled with molecular dynamics simulations confirmed that strategic selection of small-molecule co-formers with optimized ratios could generate smaller nanoparticles (288 nm) exhibiting superior physical stability compared to polymer-based nano-amorphous systems. Radial distribution function analysis of the amino acid-rutin system detected robust intermolecular interactions (708.8103 kcal/mol), where the formed hydrogen-bonding network effectively suppressed rutin recrystallization. The dual strategy combining nanotechnology with amorphization technology achieved remarkable dissolution enhancement (85 % drug release), substantially exceeding the performance of microparticulate systems. This effect was further amplified through lyophilization using a ternary excipient system (hyaluronic acid-povidone-polyvinyl alcohol), which improved mechanical resilience. The nano-co-amorphous powder demonstrated 69.87 μg/mL transdermal flux, representing significant advancement over nanocrystalline formulations (49.86 μg/mL). The developed rutin-lysine nano-co-amorphous microneedles exhibited clinically relevant wound healing efficacy, validating their therapeutic potential.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lin-Jie Guo,Yi-Lei Li,Feng Xu,Yuan Zhuang,Xuan-Ru Zhang,Zu-Heng Hu,Le-Zhong Li
This study investigates the effects of co-doping Bi 2 O 3 and Nb 2 O 5 on the microstructure, electrical, and magnetic properties of NiZnCo ferrites. The NiZnCo ferrites with fixed 0.3 wt.% Bi 2 O 3 doping and different Nb 2 O 5 doping contents (0–0.8 wt.%) were synthesized by state-phase reaction method. The study shows that all Ni 0.55 Zn 0.35 Co 0.1 Fe 2 O 4 samples co-doped with Bi 2 O 3 and Nb 2 O 5 exhibit a single-phase spinel structure. With increasing Nb 2 O 5 concentration, the average grain size of the ferrites increases continuously, while the porosity decreases. Furthermore, the real part of the dielectric constant rises to 2.42×10 5 , and the DC resistivity decreases to 3.08×10 5 Ω·m. The saturation magnetization varies from 40.78 to 53.29 emu/g, and the coercivity ranges from 18.00 to 19.14 Oe. Notably, among samples with different Nb 2 O 5 doping levels, the ferrite co-doped with 0.2 wt.% Nb 2 O 5 exhibits the highest initial permeability of 111.24, which is approximately four times higher than that of pure NiZnCo ferrite. These results indicate that Bi 2 O 3 –Nb 2 O 5 co-doping not only effectively regulates grain growth and porosity but also achieves a synergistic optimization of dielectric and magnetic properties. The introduction of an appropriate amount of Nb 2 O 5 leads to high initial permeability and moderate DC resistivity, helping to reduce mismatches between magnetic and dielectric losses. The combination of high dielectric constant and favorable magnetic response enhances the impedance matching and energy dissipation capabilities of the material for electromagnetic waves. Therefore, this co-doped ferrite offers a promising material candidate for the design of electromagnetic absorbers and soft magnetic components.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yang Kuang,Gang Zhao,Tengrui Feng,Luchao Zhao,Qi Wu
Molybdenum diselenide (MoSe 2 ) has been extensively researched as a promising electrocatalyst for hydrogen evolution reaction (HER). However, its intrinsic properties are still constrained by insufficient exposure of the active site and poor electrical conductivity. Therefore, it is essential to synthesize metallic phase MoSe 2 (1T-MoSe 2 ) with abundant active sites in order to further enhance its HER performance. To achieve this goal, Co-doped MoSe 2 nanosheets with a high 1T phase concentration were synthesized using a simple one-step hydrothermal method. Experiments and theories have demonstrated that Co doping induces the phase transition of MoSe 2 from the 2H to the 1T phase. In a 1 M KOH solution, the overpotential of Co-doped 1T-MoSe 2 at 10 mA cm −2 is only 218 mV, which is significantly superior to that of pure MoSe 2 (287 mV), and the Tafel slope is lower at 115.7 mVdec −1 . Furthermore, the nanosheets exhibited high stability, retaining their catalytic properties even after 200 h of continuous use. Density functional theory (DFT) calculations indicate that Co doping enhances the electrical conductivity and the achieves a minimal value of ΔG H∗ (only about 0.094 eV). This work proposes a strategy to design highly efficient electrocatalysts based on 1T-MoSe 2 .
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