ENERGY & FUELS
·
2017
·
IF 3.091
Yu-Lu Wang,Ji-Feng Zheng,Shuai Yan,Yue-Yuan Ye,Shui-Rong Li,Duo Wang,Yun-Quan Liu
A novel liquefaction method was developed for transforming different types of biomass, such as fir, bamboo, pine, and corncob, into bio-oil efficiently with Raney nickel (R-Ni) and NaOH as combined catalysts in a 2-propanol/H2O system, which was carried out in a 50 mL stainless-steel autoclave at 245 °C, corresponding to the working pressure maintained at 8 MPa. The conversion of biomass could reach 97–99%. Besides, a high bio-oil yield of 63.98% and higher heating value of 30.09 MJ/kg were achieved when fir was used as the feedstock. The gas chromatography–mass spectrometry analyses indicated that the major compounds in bio-oils were phenols, followed by acids, alcohols, ketones, and hydrocarbons, which were mainly light-weighted molecules with low boiling points measured by thermogravimetric analysis. Additionally, the R-Ni catalyst could be repeatedly used at least 5 times without the loss of activity.
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MATERIALS SCIENCE FORUM
·
2017
·
IF 0
Zhao Bing Cai,Xue Jia Pang,Xiu Fang Cui,Xin Wen,Zhe Liu,Mei Ling Dong,Yang Li,Guo Jin
In order to improve the surface properties of Ti-6Al-4V, high-entropy alloy coatings were prepared by in-situ laser cladding on the surface of Ti-6Al-4V substrate. The microstructure, micro-hardness, corrosion resistance and wear resistance were investigated. The results showed that the high-entropy alloy coating was composed of BCC high-entropy alloy phase, α-Ti phase and (Ni, Co)Ti2 phase. The micro-hardness of the high-entropy alloy coatings is much higher than that of Ti-6Al-4V substrate. The coating also has a better corrosion resistance than Ti-6Al-4V substrate, even superior to 304SS in 3.5wt.% NaCl solution at room temperature. Compared with Ti-6Al-4V substrate, the high-entropy alloy coating has a greater wear resistance with the wear mass loss decreased 28.2% and 23.1%, respectively. Wear patterns of Ti-6Al-4V substrate and high-entropy alloy coatings are the coexistence of adhesive wear and abrasive wear, but the wear degree of high-entropy alloy coatings is lower.
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CATALYSIS COMMUNICATIONS
·
2016
·
IF 3.389
Yanhong Huang,Shuqian Xia,Peisheng Ma
The effect of zeolite solid acids on the in situ hydrogenation of bio-derived phenol over Raney Ni was investigated, which indicated that the conversion of phenol increased with the addition of zeolite solid acids and Hbeta (Si/Al = 60) showed the best performance of high phenol conversion and selectivity towards the desired products and low carbon loss. In addition, the quantity of Hbeta (Si/Al = 60) and Raney Ni had marked impact on the carbon loss, but little effect on both the conversion and the products distribution. And the mixed catalysts of Raney Ni and Hbeta (Si/Al = 60) exhibited excellent stability.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 4
·1-10
·
IF 2.1
Van Thuy Vu,Trang Vu Thao,Chun Sangeun,Thu Tran Viet
As a promising electrode material for electrochemical energy storage, iron hexacyanoferrate (FeHCF) possesses diverse structures and properties that strongly relate to synthetic conditions. In this work, we synthesized FeHCFs by co-precipitation route and studied the influence of two surfactants (sodium citrate and potassium bitartrate) on the material characteristics and K + storage properties of the resulting FeHCFs. Electrochemical measurements revealed that the FeHCF synthesized in the absence of surfactants exhibited superior performance to those synthesized in the presence of either surfactant due to reduced electrical resistivity and improved diffusion kinetics. The assembled all-solid-state symmetric device delivered an areal capacitance of 3.24 mF cm −2 , a wide potential window (1.4 V), an energy density of 3.17 μWh cm −2 , and a power density of 315.7 μW cm −2 at a current density of 0.5 mA cm −1 , indicating its potential application for energy storage.
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NEW CARBON MATERIALS
·
2024
·
IF 6.5
Xu Chen,Jin-yu Zhao,Wen-sheng Zhang,Xiao-min Wang
Designing efficient and robust catalysts for hydrogen evolution reaction (HER) is imperative for saline water electrolysis technology. A catalyst composed of Co x P nanowires array with N-doped carbon nanosheets (NC) was fabricated on Ni foam (NF) by an in-situ growth strategy. The material is designated as NC/Co x P@NF. In the preparation process, Co(OH) 2 nanowires were transformed into a metal organic framework of cobalt (ZIF-67) on NF by the dissolution-coordination of endogenous Co 2+ and 2-methylimidazole. The resulting cactus-like microstructure gives NC/Co x P@NF abundant exposed active sites and ion transport channels, which improve the HER catalytic reaction kinetics. Furthermore, the interconnected alternating nanowires and free-standing nanosheets in NC/Co x P@NF improve its structural stability, and the formation of surface polyanions (phosphate) and a NC nanosheet protective layer improve the anti-corrosive properties of catalysts. Thus, the NC/Co x P@NF has an excellent performance, requiring overpotentials of 107 and 133 mV for HER to achieve 10 mA cm −2 in 1.0 mol L −1 KOH and 1.0 mol L −1 KOH + 0.5 mol L −1 NaCl, respectively. This in-situ transformation strategy is a new way of constructing highly-efficient HER catalysts for saline water electrolysis.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 47
·33301-33313
·
IF 10.7
Yantong Long,Guoliang Zhao,Liuxin Yang,Yongjun Xu,Chen Xu
Efficient bifunctional catalysts for hydrogen/oxygen evolution reactions (HER/OER) are critical for industrial application of overall water splitting. Herein, a self-supported nanostructure consisting of CoNi–P and embedded carbon dots (denoted as CoNi–P/CDs/NF) with large specific surface area has been designed and fabricated, through a phosphorization process on precursors grown on 3D porous Ni foam. The resultant electrocatalyst exhibited excellent electrocatalytic performance for both the HER (45.2 mV@10 mA cm−2) and OER (184.8 mV@20 mA cm−2) under alkaline conditions. The cell voltage of the full water splitting device assembled was only 1.50 V to achieve 20 mA cm−2 and exhibited great durability benefiting from the self-supported nanostructure. The density functional theory (DFT) calculations and XPS analysis suggest that the synergistic coupling effect between CDs and substrate CoNi–P could tune the electronic structure. Moreover, the embedded CDs increase electrical conductivity and active sites of the catalyst. Both of these and the high specific surface benefited from the 1D/3D hierarchical structure could explain the excellent electrocatalytic performance. The rational materials design of 1D/3D hierarchical structured non-noble bimetallic phosphide catalysts in this work may suggest a new strategy for designing bifunctional electrocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenhao Peng,Xin Min,Shiping Luo,Aijuan Xie
Transition metal oxides (TMOs) and sulfides (TMSs) have garnered significant attention as promising electrode materials for supercapacitors due to their complementary properties, including high conductivity, abundant active sites, and structural stability. The rational design and facile synthesis of TMO-TMS hybrid materials with unique architectures are critical to achieving high-performance energy storage devices. This study presents a novel CuMn 2 O 4 @CuMn 2 S 4 core-shell nanostructure developed on a nickel foam substrate through hydrothermal and sulfurization processes. The CuMn 2 O 4 core offers robust structural support and high conductivity, while the CuMn 2 S 4 shell enhances electrochemical activity and ion diffusion. The synthesized material, CuMn 2 O 4 @CuMn 2 S 4 NF-2, achieved a specific capacitance of 760.5 F·g −1 at 1.0 A·g −1 , demonstrating superior electron transfer resistance ( R ct =2.06 Ω) and excellent cycling stability, retaining 85.2 % of capacitance after 5000 cycles. Furthermore, an asymmetric supercapacitor (ASC) with CuMn 2 O 4 @CuMn 2 S 4 NF-2 as the positive electrode and activated carbon as the negative electrode delivered a maximum energy density of 35.31 Wh·kg −1 at a power density of 750 W·kg −1 and retained 75.5 % capacitance after 5000 cycles. This study underscores the significant potential of integrating oxide and sulfide materials in a single architecture, offering a promising pathway for designing high-performance energy storage systems that capitalize on the synergistic properties of both material types.
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LANGMUIR
·
2024
·
IF 3.7
Fengxin Cao,Yao Zhang,Qiaoling Li,Chengcheng Yu
Hydrogen is considered clean energy with broad application prospects for the 21st century, and water electrolysis plays a crucial role in hydrogen production. However, economic limitations and large overpotential values hinder its development. In this study, we deposited nickel (Ni), iron (Fe), and sulfur (S) onto nickel foam (NF) using the constant potential method to form the Ni–S–Fe/NF catalyst, which exhibited an exceptionally low overpotential (31 mV) at a current density of −10 mA cm–2, and a Tafel slope of 75.1 mV dec–1 in 1 M sodium hydroxide. It showed a minor charge resistance (1.256 Ω). The amorphous phase structure and optimized catalyst composition promoted outstanding hydrogen evolution activity. This work offers valuable perspectives on the industrial application of hydrogen production.
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PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Bolun Tang,Yunbo Shi,Canda Zheng,Kuo Zhao
To date, various materials have been widely investigated for developing highly selective and sensitive sensors for NO
2
, a common hazardous gas. However, the associated NO
2
-gas-sensor fabrication methods exhibit several drawbacks, which hinder the development of NO
2
-sensitive gas sensors with excellent selectivity. In this study, NiP
2
-Ni
2
P polymorphs with observable heterointerfaces were prepared using metalloid NiP
2
and metallic Ni
2
P for NO
2
gas sensing, and the characteristics of the synthesized polymorphs were evaluated through X-ray diffraction and energy-dispersive spectrometry. At 160 °C, the fabricated sensor exhibited a response of 1.5%-93.14% for NO
2
gas over a concentration range of 0.5-60 ppm; its response and recovery times were 16 and 55 s, respectively. In addition, the sensor exhibited excellent NO
2
selectivity and long-term stability. Density functional theory calculations revealed the adsorption sites of NO
2
molecules on NiP
2
, and the gas-sensing mechanism was elucidated. The findings of this study establish NiP
2
-Ni
2
P, which is currently employed as an outstanding electrocatalyst for hydrogen evolution, as a potential NO
2
sensor platform with excellent selectivity and efficient recovery characteristics.
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VACUUM
·
2025
·
IF 3.9
Fu-Hua Sun,Zihao Zheng,Mingrui Liu,Jun Tan,Dongxia Tian,Fei Liu,Hong Li,Lun Yang,Xinyu Wang,Shifang Ma,Xiaolei Nie,Shaoqiu Ke
The high thermal conductivity of bulk thermoelectric (TE) materials is the main reason limiting the application field of bulk TE devices. The tetrahedrite (Cu 12 Sb 4 S 13 ) is a kind of TE material with extremely low thermal conductivity. If the thermal conductivity can be further reduced, it is expected to expand the application field of bulk TE devices. Herein, some carbon-based nanoparticles (diamond, CNTs, B 4 C, and SiC) of different grain size are embedded into the Cu 11.5 Ni 0.5 Sb 4 S 12.7 (CNSS) matrix by mechanical alloying and spark plasma sintering to enhance the TE performance. It is discovered that the Seebeck coefficient of CNSS/carbon-based nanoparticles nanocomposites remarkably increased while the total thermal conductivity significantly decreased because of the nanopores and new heterogeneous interface of CNSS/carbon-based nanoparticles induced by nanoscale carbon-based particles enhancing carrier and phonon scattering. As a result, the total thermal conductivity of the nanocomposites decreases from 1.36 Wm -1 K −1 to 0.93 W m −1 K −1 at 723 K with 0.2 vol% of SiC nanoparticles, decreasing 32 %. The maximum ZT reaches 1.0 at 723 K for the nanocomposite with 0.20 vol% of SiC, increasing 43 %. These results verify that the introduction of carbon-based nanoparticles is a promising method to improve the application of Cu 12 Sb 4 S 13 -based modules.
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Crystals
·
2024
·Vol. 14
·期 8
·728
·
IF 2.4
Boyu Wang,Zhiyuan Jiang
Recently, there has been a growing interest in skutterudite (SKD) compounds containing electronegative elements such as Br, Cl, S, Se, and Te, owing to their increased diversity and the versatility of filler atoms. This study focused on the thermoelectric performance of a series of (Ni, Te) co-doped SKDs filled with the electronegative element S, denoted as SxNi0.4Co3.6Sb11.2Te0.8(x= 0, 0.1, 0.2, and 0.3). These compounds were prepared using a combination of a solid-state reaction and spark plasma sintering techniques. The results showed that (Ni, Te) co-doping introduced excess electrons in the SKD lattice, while the incorporation of the element S into the SKD voids optimized carrier concentration. This led to a considerable increase in the absolute Seebeck coefficient to 110.6 μV K−1at ambient temperatures. The presence of S fillers induced phonon resonance scattering and point scattering, which reduced lattice thermal conductivity and ultimately improved the thermoelectric figure of meritzT, which reached 0.93 for S0.3Ni0.4Co3.6Sb11.2Te0.8at 823 K.
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TALANTA
·
2017
·
IF 4.162
Sheng Niu,Lijuan Zheng,Abdul Qayyum Khan,Guang Feng,Heping Zeng
A fast and sensitive analysis for trace level heavy metals in aqueous solution was realized by using an improved laser induced breakdown spectroscopy (LIBS) methodology. Solutions containing heavy metal elements, Ni, Cr, and Cd, were concentrated in a laser-pretreated area (25 × 20 mm 2 ) of a polished aluminum target surface, wherein pretreated grooves enabled homogeneous distribution of the metallic solutions in the well-defined area, and laser ablation of the aluminum target produced unique plasma excitation of various metallic ions . For 1-mL solutions deposited, we obtained an analytical precision of about 7% relative standard deviation (RSD), and limits of detection (LODs) of 22, 19, and 184 μg/L for Ni, Cr, and Cd, respectively. Moreover, the laser-pretreated metallic microstructure allowed more solution deposited with the help of a hot plate, which supported improvement of LODs to sub-μg/L level for Cr and Ni and μg/L level for Cd with about 20-mL solution engaged in the enrichment processes. The applicability of the proposed methodology was validated on certified reference materials and real river water.
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