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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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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yuxuan Shao,Junjie Ni,Jie Yin,Xinqing Liu,Yulai Song,Yue Xu,Shuai Guo,Laima Luo
The construction of heterojunctions between non-noble-metal based compounds affords a scheme for accelerating the reaction kinetics of oxygen evolution reaction (OER) without using precious mental materials, which is extremely important but remains challenging. Herein, the heterogeneous structure between Fe 60 Co 10 Ni 10 Cr 10 Mn 10 medium-entropy alloy (MEA) and FeS 2 is developed by a mechanical alloying approach. The resulting MEA-30 wt%FeS 2 delivers a high OER activity with a low overpotential of 261.6 mV at 10 mA/cm 2 , along with Tafel slope of 52.7 mV/dec in 1.0 mol/L KOH solution, superior to the commercial RuO 2 . The combination of detailed characterization techniques and density functional theory (DFT) calculation reveals that the heterojunctions between Fe-based MEA and FeS 2 generates the synergistic effect on the activation and formation steps of OOH*, thus promoting the OER reaction kinetics. Furthermore, the abundant active sites provided by the reconstructions of MEA-30 wt%FeS 2 during OER process also contributes to the catalytic performance. This work greatly expands the application scope of medium-entropy materials and provides a new method for the fabrication of novel heterogeneous electrocatalyst of Fe-based MEA and FeS 2 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zeting Deng,Xiangbowen Du,Kaicheng Qian,Leilei Du,Zheng Fang,Jiayang Zhu,Jia Hong,Feng Wang,Tongtong Li,Tong Wei,Renhong Li
The conventional anodic oxygen evolution reaction (OER) can be ideally replaced by the urea oxidation reaction (UOR) to achieve efficient hydrogen generation due to the superior thermodynamics. However, the UOR involves a slow 6-electron transfer dynamic, necessitating the utilization of high-performance catalysts to enhance catalytic efficiency. In this work, a bifunctional transition metal-based catalysts, namely, MoO 2 –NiO/NF heterostructure, is effectively synthesized using two-step hydrothermal methods and calcination. Benefiting from the heterogeneous interface, the nanoflower-like structure as well as the electron density redistribution, the MoO 2 –NiO/NF catalyst demonstrates remarkable durability and performance, with an overpotential of 139 mV to achieve 10 mA cm −2 for UOR. In addition, the bifunctional catalyst is used in a two-electrode electrolyzer, where a current density of 10 mA cm −2 is attained at a potential of 1.317 V, which is 261 mV smaller than that of the conventional water splitting system. Based on the density functional theory (DFT) calculations, the MoO 2 –NiO/NF heterostructure exhibits a higher density cloud in the vicinity of the Fermi level, revealing that it has faster electron transfer and higher electrical conductivity. Besides, the Mo sites and Ni sites are favorable for adsorption of CO(NH 2 ) 2 and H 2 O, respectively, which might optimize the reaction intermediates adsorption/desorption for UOR/HER, ultimately leading to the high electrocatalytic performance of MoO 2 –NiO/NF. This research opens a new window for the development of advanced heterojunction electrocatalysts assisted by urea electrocatalysis for cost-effective hydrogen production.
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FUEL
·
2024
·
IF 6.7
Wenfeng Peng,Zhengxing Lv,Wenju Zhou,Bingmin Yan,Shijing Zhao,Lailei Wu,Junshuang Zhou,Huiyang Gou
Creating highly efficient bifunctional transition metal phosphide catalysts for electrochemical water splitting through cost-effective and universal methods remains an elusive challenge. Here we introduce a universal high temperature and high pressure (HTHP) technique that readily produce phase-pure TMPs, including FeNiP, CoNiP, and Fe 2/3 Co 2/3 Ni 2/3 P (CFNP), which can serve as an ideal model for investigating the relationship between electrocatalytic activity, structure, and chemical composition. The crystal structure of obtained CFNP has been carefully determined for the first time by using single-crystal X-ray diffraction (XRD) and XAS simulations. In the structure of CFNP, iron atoms form an MP4 tetrahedron with Co atoms and a 5-coordination pyramid with Ni atoms. This arrangement synergistically induces an electron-deficient state in the metals and an electron-rich state in phosphorus, enhancing CFNP/NF’s bifunctional catalytic effectiveness, achieving low overpotentials of 92 mV and 239 mV at 10 mA/cm 2 in 1 M KOH environment for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Moreover, an integrated electrolyzer using CFNP/NF as both electrode components can achieve a current density of 10 mA cm −2 at 1.536 V, showcasing a catalytic activity for overall water splitting comparable to those of phosphide-based electrocatalysts. The HTPH technique opens new possibility for exploring pure-phase multimetallics and high-entropy phosphides as potential multifunctional materials for potential applications.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Fengxin Cao,Qiaoling Li,Boya Shan,Zhiwei Qi,Chenyu Zhang,Chengcheng Yu
To create an economical, stable, along highly efficient catalyst for the hydrogen evolution reaction, this paper reports on a Cr-doped self-supported Co-P-Cr/NF high-performance HER catalyst synthesized in one step. It exhibits overpotentials of 41.44 mV at −10 mA cm −2 . Moreover, the impedance is only 0.56 Ω, and the double-layer capacitance value is 40.02 mF cm −2 . After a 12-hour stability test, the catalyst shows only minimal overpotential increase. Using techniques including XRD, XPS, SEM, and TEM, the structure of the electrocatalyst was thoroughly investigated. The introduction of Cr and the excellent electronegativity of P enhance the redox capability and show superior intrinsic electrocatalytic ability in Co-P-Cr/NF catalysts. Therefore, the Co-P-Cr/NF catalyst that has been developed shows promise in replacing costly Pt-based electrocatalysts in the HER.
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