INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chunjie Yu,Xingwu Zhai,Pengcheng Wu,Zhaoqing Zhu,Banghua Peng,Guixian Ge,Zhiyong Liu
Low cost, high activity and stability electrocatalysts for hydrogen evolution reaction (HER) have been extensively studied in recent years. We have successfully synthesized a transition metal phosphide electrocatalyst (CoNi@CP) with coating structure . The CoNi@CP was prepared with the mild conditions. An organophosphorus ligand was synthesized by simple organic reaction . It was synthesized by coordination with Co 2+ and Ni 2+ and then calcined. CoNi@CP has abundant and uniform phosphorus atom doping, no energy consumption in phosphating process, and avoids the generation of highly toxic gas PH 3 . Because of its special coating structure, the adsorption of H ∗ on its surface was enhanced, and the active center of CoNi was protected, which contributed greatly to the improvement of catalytic performance. At 10 mA/cm 2 current density, the overpotential of the catalyst only 74 mV, and the slope of Tafel was only 83 mVdec -1 . The performance of the catalyst remained unchanged after 1000 stability tests. In addition, we had proved theoretically that the catalyst had high HER activity by DFT calculation. Therefore, it provides inspiration for us to better develop efficient transition metal phosphide electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Xin Yu,Xiaoyi Huang,Wenlong Jia,Jiahong Chen,Shibo Yang,Lincai Peng,Yong Sun,Xing Tang,Xianhai Zeng,Shuliang Yang,Zheng Li,Feng Xu,Lu Lin
Developing active and affordable catalysts for the transformation of biomass platform into value-added chemicals have drawn tremendous attention. Herein, we have successfully prepared a CoNi bimetallic nitrogen-doped carbon nanotubes (CNTs) catalyst, manifesting outstanding catalytic performance for furfural oxidative esterification under base-free conditions (methyl furoate yield >99%), and great recyclability (5th recycle). Importantly, an impressive methyl furoate formation rate of around 1980 μmol methyl furoate ·g cat −1 ·h −1 was achieved, to the best of our knowledge, the result represents one of the highest methyl furoate formation rates. The results revealed that the doping of Ni into the Co x Ni y -CNTs catalyst brings about more active sites. Fourier transforms infrared spectrometer results suggest that the Ni-N x sites are responsible for the adsorption of the substrate with tilted or vertical adsorption. Furthermore, the introduction of Ni facilitates the improvement of basicity, which in turn promotes the β-hydride elimination. All of these active sites boost the overall activity of the catalyst for the oxidative esterification of furfural.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Qiqin Liang,Lei Wang,Xiaosi Qi,Qiong Peng,Xiu Gong,Yanli Chen,Ren Xie,Wei Zhong
Impedance matching characteristics and loss capabilities including magnetic loss, polarization loss and conduction loss are critical factors to improve microwave absorption performances (MAPs). To elevate these aspects, herein, yolk-shell structured CoNi@Air@C/SiO 2 @Polypyrrole (PPy) magnetic multicomponent nanocubes (MCNCs) were designed and successfully fabricated in high efficiency through a continuous co-precipitation route, classical Stöber method, thermal treatment and polymerization reaction. The obtained results indicated that the formation of SiO 2 effectively stabilized the cubic geometrical morphology and yolk-shell structure during the high-temperature pyrolysis process. The introduction of PPy greatly boosted their polarization loss and conductive loss capabilities. Therefore, the as-prepared yolk-shell structured CoNi@Air@C/SiO 2 @PPy MCNCs presented superior MAPs compared to CoNi@Air@C/SiO 2 MCNCs. Furthermore, by regulating the content of PPy, the obtained CoNi@Air@C/SiO 2 @PPy MCNCs displayed tunable and excellent comprehensive MAPs in terms of strong absorption capabilities, broad frequency bandwidths and thin matching thicknesses, which could be ascribed to the unique structure and excellent magnetic-dielectric synergistic effect. Therefore, our findings provided an alternative pathway to effectively utilize the magnetic-dielectric synergy and loss capabilities for the developing yolk-shell structured magnetic MCNCs as the strong wideband microwave absorbers.
研究领域:
材料科学
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电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qingbin Xu,Linchun Shi,Weijun Kong,Jing Wang,Peigen Xiao,Jinxin Liu
A meticulously engineered bacillus-shaped CoNi ZIF-MXene@MWCNT carbon cloth (CC) composite was synthesized through a one-step immersion method, which was employed in the development of a novel electrochemical (EC) sensor for the sensitive detection of salidroside (SAL) in Rhodiola. Characterization of the CoNi ZIF-MXene@MWCNT CC was conducted using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and EC methods. The bacillus-shaped composite showcased an exceptionally high rate of active site exposure, superior conductivity, and electrocatalytic efficiency, attributed to the synergistic effects of the constituent materials. The remarkable electrocatalytic capability facilitated the redox reaction of SAL, marked by a significant enhancement in the current signal. This led to a concentration-dependent response enabling the quantitative detection of SAL. The mechanism of the redox reaction might be the oxidation of the phenolic hydroxyl group of SAL. Demonstrating high sensitivity, selectivity, and stability, this novel bacillus-shaped composite-based EC sensor achieved a low detection limit (LOD) of 0.0958 µ g/mL for SAL, within an effective linear range of 0.5–500 µg/mL. Importantly, the EC sensor proved to be adept at practical detection of SAL in Rhodiola samples with complex matrices, and the salidroside content of Rhodiola crenulata was much higher than that of Rhodiola rosea , indicating that Rhodiola crenulata may have a higher medicinal value, offering a promising avenue for rapid and sensitive detection of SAL.
研究领域:
电化学
·
材料科学
·
分析化学
·
药学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jihao Su,Yu Zhang,Yuntong Meng,Xiaohui Guan,Min Lu
Supercapacitors , with their potential to revolutionize energy storage and usage, are an encouraging electrochemical energy storage technology. In this field, metal-organic framework (MOF) is considered as an excellent precursor and self-sacrifice template for synthesizing high performance electrode materials. On the outside of CoNi-MOF hollow spheres, zeolitic imidazolate framework (ZIF-67) is epitaxially grown to form a hierarchical porous structure. Then, a bit of nickel ions are added for etching and precipitation reactions, so that the structure can be further processed. The specific capacitance of CoNi@ZIF-LDH composite can achieve 1488 F g −1 at a current density of 1 A g −1 , and it has complete reversibility after 3000 cycles (cycle efficiency is 83.87 %). In addition, the maximal energy density of CoNi@ZIF-LDH//AC HSC is 49.8 Wh kg −1 when the power density is 800 W kg −1 . Meanwhile, it shows remarkable cycle durability (the capacitance retention rate is 94.85 % after 5000 cycles). This unique electrochemical property is primarily related to the establishment of hierarchical porous structures and the subsequent structural change produced by the site-directed transformation strategy. The special structural design and optimization of MOF materials provide a more convenient, more expandable, and more promising new idea for preparing high-efficiency electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mingliang Ma,Zijian Liao,Xuewei Su,Qixi Zheng,Yanyan Liu,Yan Wang,Yong Ma,Fei Wan
Increasing electromagnetic (EM) radiation has driven the rapid development of carbon-based EM wave absorption materials, but the design of light-weight and efficient carbon-based materials remains a huge challenge. Herein, N -doped carbon fibers embedded with CoNi alloy particles (CoNi/C fibers) were synthesized via electrospinning technology and carbonization . Then, conductive polypyrrole-coated CoNi/C fibers (CoNi/C@PPy composites) were synthesized by chemical polymerization. As-synthesized CoNi/C@PPy composites showed outstanding EM wave absorption property due to the synergistic effect between CoNi, N -doped carbon fibers and PPy. The optimal reflection loss (RL) is -68.78 dB (12.90 GHz) with the thickness of 2.43 mm and the low filler loading of 15 wt%. The widest effective absorption bandwidth (EAB) is 5.62 GHz with the thickness of 2.10 mm and the low filler loading of 20 wt%. The outstanding EM wave absorption property is mainly attributed to 3D network structure, great impedance matching and strong dielectric loss. The results showed that embedding magnetic alloy particles in carbon fibers coated with conductive polymers is an effective strategy for constructing efficient lightweight EM wave absorption materials.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Luoming Kang,Bin Jiang,Xiaoming Xiao,Longfei Zhang,Xiaodong Yang,Na Yang,Yongli Sun,Luhong Zhang
Liquid organic hydrogen carrier (LOHC) systems require efficient, low-cost catalysts for scalable hydrogen storage. Here, a reusable CoNi bimetallic catalyst was developed through one-step reductive pyrolysis of ZIF-67-L, forming CoNi alloy nanoparticles embedded in a 3D carbon nanosheet/nanotube (CNS/CNT) heterostructure. Using N-ethylcarbazole (NEC) as a model compound, the optimized catalyst enables rapid hydrogenation (5.72 wt% H 2 uptake at 150 °C, 8 MPa in 80 min) and dehydrogenation (5.64 wt% H 2 release at 220 °C, 0.1 MPa), with high recyclability over seven cycles. The CNS/CNT facilitates electron transport, enhances active site exposure, and provides a high surface area. Combined XPS and DFT results reveal that the synergy between the CNS/CNT architecture and CoNi alloying modulates the electronic environment of Co 0 sites, reduces the energy barrier for H 2 dissociation, and improves catalytic performance. This study provides new insights into the design of highly active and stable non-noble metal catalysts for LOHC systems to achieve reversible hydrogen storage.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Mingmin Zhong,Zhixiong Lao,Jianrong Tan,Guangzhou Yu,Yan Liu,Yong Liang
Taste and odor (T&O) compounds are important water pollutant , some of which are toxic. The relevant studies are all expand upon the well-known T&O compounds but for the unknown odors in smelling water. In this work, a method combining purge and trap with gas chromatograph-mass spectrometer (PT-GC/MS) and disperse solid-phase extraction with gas chromatograph (GC) was first proposed to detect T&O compounds in unknown odorous water accurately. Firstly, PT-GC/MS was used for a qualitative test on unknown odors in smelling water and determine the analytes. The hollow CoNi-layered double hydroxide (LDH) on graphene oxide (GO) was then used as a composite adsorbent to pretreat the water, in which the GO provided large specific surface, and the LDH worked as a confinement cavity to enhance capture and retention capacity for volatile organic compounds (VOCs). According to the properties of T&O compounds determined by PT-GC/MS in water, a corresponding GC method was established for accurately quantitative analysis. In this paper, five T&O compounds were detected simultaneously, including dimethyl sulfide, meistylene, N, N-dimethylbenzylamine, 2, 4-dimethylbenzaldehyde and 2, 4-di-tert-butylphenol. Extraction parameters were optimized, including ratio of desorption solvent, amount of adsorbent, pH value, etc. Under the optimal conditions, the detection limits for analysis were 1.14 μg/L to 3.07 mg/L. The satisfactory recoveries were 94–98%. Furthermore, two optimal determination outcomes of odor waters from different places support the practicability of the method, which is expected to be widely used in the detection of unknown odors in smelling water.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lihua Chen,Bingyue Zheng,Shuxin Song,Huimin Shu,Dongtai Gao,Tingxi Li,Wenhui Zheng,Yong Ma
As worldwide demand for high-performance energy storage rises, supercapacitors have become increasingly prominent due to their superior power capabilities and extended operational lifespan. In this study, CoNi-layered double hydroxide (CoNi-LDH) was deposited onto electrospun carbon nanofibers (CNFs) via a simple hydrothermal method, then by phosphorization to fabricate CoNiP nanostructured arrays to serve as the positive electrode material for an asymmetric supercapacitor. Meanwhile, a covalent organic framework (COF) was synthesized via a solvothermal method, carbonized under a nitrogen atmosphere, and coated onto carbon cloth as the negative electrode material (N-COF). Specifically, CNF/CoNiP-500 achieved a specific capacitance of 675.94 F g −1 at 0.5 A g −1 , while N-COF reached 267.53 F g −1 . The flexible asymmetric supercapacitor based on CNF/CoNiP//N-COF demonstrates outstanding electrochemical behavior: it achieves a specific capacitance of 248.08 F g −1 at 1 A g −1 within a 1.5 V window. The full device provides an energy density of 81.21 Wh kg −1 at a power density of 1499.62 W kg −1 and maintains 90.56 % of its initial capacitance after 10,000 cycles. Phosphorization and nitrogen doping significantly enhanced electrode conductivity and pseudocapacitive performance, providing technological support for the development of next-generation high-performance flexible supercapacitors.
研究领域:
储能
·
纳米材料
·
电化学
·
材料科学
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Jiang Bo,Long Bo,Si Chen,Li Qing-Guo,Zhang Chao,Ma Jin-Cheng,Zhuang Ya-Ming,Yang Ya-Ke,Lin Si-Yi,Li Yun-Yun
Although carbon fiber electromagnetic wave absorbing materials have shown great potential in the field of electromagnetic protection, the currently reported carbon fiber-based absorbers are limited to the manipulation of composition and external structure, lacking the design of intrinsic morphology. To fill the above-mentioned gap, this work presents a spiral carbon fiber compounded with CoNi magnetic nanoparticles (CoNi@SCF). Attributed to its special morphology and dielectric-magnetic synergy, this material offers abundant attenuation mechanisms, demonstrating strong absorption at multiple frequencies with broadband application potential. In particular, the maximum reflection loss and effective absorption bandwidth of CoNi@SCF reach −66.5 dB at 2.9 mm and 6.6 GHz at 2.1 mm, respectively, and the maximum RCS reduction value of 41.5 dB m 2 also confirms the actual efficiency. In addition, gelation and hydrophobic modification experiments have been explored to meet the requirements for the employment of magnetic carbon fibers in practical scenarios. Therefore, this work may provide new inspiration for the design and manufacture of novel magnetic carbon fiber absorbers with great stability and multiband absorption performance. Graphical abstract
研究领域:
材料科学
·
电磁功能材料
·
纳米复合材料
·
吸波材料工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 12
·7790-7798
·
IF 1.093
Wei Liguo,Chen Wei,Jia Chenyang,Wang Dong,Li Ming,Dong Yongli,Song Weina,Liu Lilai,Yang Yulin
In this paper, CoNi bimetallic nanoparticle decorated reduced graphene oxide (CoNi-RGO) was synthesized by a facile hydrothermal method. When applied this CoNi-RGO into counter electrode for dye-sensitized solar cells (DSSCs), it shows smaller charge-transfer resistance and better electrocatalytic
activity than that of pure reduced graphene oxide (RGO). At the optimized conditions, the energy conversion efficiency of DSSCs based on CoNi-RGO counter electrode was 3.79%, indicating a higher photovoltaic performance of DSSCs based on CoNi-RGO counter electrode than that of DSSCs based
on RGO counter electrode (1.37%), and comparable to the value of DSSCs based on Pt counter electrode as a reference (4.95%). Additionally, the photovoltaic performance of DSSCs based on CoNi-RGO counter electrode strongly depends on its composition. The molar ratio of Co/Ni and the weight
ratio of CoNi/GO that used to prepare CoNi-RGO counter electrode are key factors to affect the performance of their cell devices. When both the molar ratio of Co/Ni and the weight ratio of CoNi/GO are 1:1, the CoNi-RGO counter electrode shows the best performance, indicating the potential
of such bimetallic nanoparticle decorated RGO as low-cost and efficient counter electrode to replace noble metal Pt counter electrode for the practical application of DSSCs devices.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2020
·Vol. 16
·期 8
·1907043
·
IF 11.459
Chun Li,Yanting Gao,Xifeng Xia,Junwu Zhu,Xin Wang,Yongsheng Fu
Conjugated coordination polymers (CPs) with designable and predictable structures have drawn tremendous attention in recent years. However, the poor electrical conductivity and low structural stability seriously restrict their practical applications in electronic devices. Herein, the rational design and synthesis of a hierarchically structured 2D bimetallic CoNi-hexaaminobenzene CPs derived from Co(OH) 2 are reported as an efficient oxygen evolution reaction (OER) self-supported electrode. The as-obtained electrode possesses high electrochemical surface area and intrinsic activity, exhibiting high electrochemical catalytic activity, favorable reaction kinetics performance, and strong durability compared with those of the powder catalysts. As a result, the electrode delivers low overpotential of 219 mV @ 10 mA cm −2 and Tafel slope of 42 mV dec −1 as well as 91.3% retention of current density after 24 h of reaction time. The results of density functional theory computations reveal that the synergistic effect of Co and Ni plays an important role in OER. This work not only presents a strategy to fabricate advanced self-supported electrodes with abundant and dense active sites, but also promotes the development of conjugated CPs for electrocatalysis.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）