JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 10
·5133-5139
·
IF 1.491
Ullah Atta,Liu Hanxing,Hao Hua,Iqbal Javed,Yao Zhonghua,Cao Minghe,Xu Qi
The ceramics were prepared using the solid-state reaction method and their phase, microstructure and microwave dielectric properties were investigated. A single-phase clinoenstatite system with monoclinic structure (space group P2 1 /c) was confirmed through x-ray diffraction (XRD) analysis for the compositions with x ≤ 0.1. The compositions with x ≥ 0.15 contain SiO 2 and (Mg 1− x
Ni
x
) 2 SiO 4 phases only as confirmed from the XRD data of their sintered samples. The unit cell volume was decreased while the theoretical density was increased with increase in x from 0 to 0.1. A decrease in dielectric constant ( ε
r ) while an increase in unloaded quality factor multiplying the resonant frequency ( Q
u
f
o ) and temperature coefficient of resonant frequency ( τ
f ) was observed with increase in Ni content from 0 to x = 0.1. In the present study, ε
r ∼ 6.10, Q
u
f
o ∼ 118,702 GHz and τ
f ∼ −10 ppm/°C was achieved for the composition with x = 0.1 sintered at 1425°C for 9 h. The material is a good candidate for millimeter wave applications.
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Journal of Biobased Materials and Bioenergy
·
2017
·Vol. 11
·期 5
·477-482
·
IF 0.975
Xu Jianxiong,Xie Shaowen,Li Changyun,Xu Lijian
Hierarchically nanoporous silicon hydrogen compound particles were synthesized by dissolving template method, and the hierarchically nanoporous Pd–HSiO1.5 were further prepared by in-situ synthesis method. The microstructure and morphology of the nanoparticles
were characterized by the transmission electron microscopy (TEM). In addition, the hierarchically nanoporous Pd–HSiO1.5/Ni–Co composite electrode was fabricated by the method of nanocomposite electrodeposition, in which hierarchically nanoporous Pd–HSiO1.5
particles were used as composite nanoparticles on the Ni–Co electroplating bath. The surface morphology was characterized by the scanning electron microscopy (SEM). Finally, the sensor was used to detect the tetracycline antibiotics with different classes. Results showed that the hierarchically
nanoporous silicon hydrogen compound particles were with hollow spherical structure. The size of the hollow spheres was about 70 nm, and the thickness of the spherical shell was about 10 nm. The Pd nanoparticles were successfully loaded on the inside and surface of the hierarchically nanoporous
silicon hydrogen compound. The size of the inside Pd nanoparticles was about 3 nm, and the size of surface Pd nanoparticles was 10–30 nm. In addition, the SEM image showed that the hierarchically nanoporous Pd–HSiO1.5 particles were uniformly inlaid on the surface of
the hierarchically nanoporous Pd–HSiO1.5/Ni–Co composite electrode. The composite electrode had high electrocatalytic activity and showed high electrochemical sensitivity in the detection of the oxytetracycline and deoxytetracycline in alkaline medium. The obtained detection
limits were 1.0 × 10–8 M and 5.0 × 10–8 M for oxytetracycline and deoxytetracycline, respectively.
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JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Tingting Hou,Yehong Wang,Jian Zhang,Mingrun Li,Jianmin Lu,Marc Heggen,Carsten Sievers,Feng Wang
In many catalytic processes, metastable reaction intermediates are more valuable and desirable than final products. Here, we report Ni–Ni δ+ clusters on ceria where the extent of reduction of nickel oxide/ceria in H 2 has been optimized. This catalyst shows high selectivity in reducing nitrobenzene to azoxybenzene, the latter usually being metastable. Due to strong electronic metal–support interactions between Ni and ceria, mixed Ni–Ni δ+ clusters are formed on ceria even after reduction at 500 °C in hydrogen. The Ni–Ni δ+ clusters are highly dispersed on ceria, as observed by high-angle annular dark-field scanning–transmission electron microscopy and energy-dispersive X-ray spectroscopy element mapping. This structural uniqueness is clearly reflected in the inhibition of azoxybenzene hydrogenation to aniline, and therefore the catalyst shows high azoxybenzene selectivity (92%). In comparison, the Ni metal catalyst mostly gives aniline and the NiO catalyst has low activity. This study shows how to steer catalytic reactions toward metastable intermediate products by tuning the extent of reduction of metal oxides deposited on reducible oxides.
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APPLIED ENERGY
·
2019
·
IF 8.426
Mingzheng Liao,Ying Chen,Zhengdong Cheng,Chao Wang,Xianglong Luo,Enqi Bu,Zhiqiang Jiang,Bo Liang,Riyang Shu,Qingbin Song
One of the most attractive routes for hydrogen production for fuel cell applications is partial oxidation of hydrocarbons. However, exothermic partial oxidation reaction tends to cause local overheating of the reaction bed therefore reducing catalytic activity. In this study, hydrogen production by partial oxidation of propane over Ni/Al 2 O 3 based catalyst with the addition of SiC was experimentally investigated. Both packed bed mixing and bulk doping methods were introduced to study the effect of SiC for its high thermal conductivity and high temperature stability. The as-prepared samples were characterized by a variety of measurements. Due to the high temperature stability of SiC particles in the bulk regions, stacking dual porous-like structures were formed after calcination by doping SiC into Ni/Al 2 O 3 with certain ratios. From the results, local overheating of the catalyst bed generated by the exothermic reactions was relieved by SiC addition for both cases. Ni/Al 2 O 3 -SiC (30 wt% SiC) catalyst performed a higher hydrogen production of 236 μmol/g cat . s and kept stable for 20 h at 600 °C compared to mechanical mixing method. Aggregation of Ni content and carbon deposition of the spent catalyst of SiC-containing catalysts were reduced compared to Ni/Al 2 O 3 . As can be seen from the morphological and non-isothermal kinetics, the carbon deposited on Ni/Al 2 O 3 -SiC catalyst that caused catalyst deactivation was more easily activated for removal due to SiC content with high thermal conductivity.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 4
·549-555
·
IF 1.071
Lu Xue,Liu Guocheng,Wang Xiang,Lin Hongyan,Wang Xiuli
We synthesized three new Ni(II) coordination polymers [Ni(L)(HIP)(H 2 O) 2 ]H 2 O(CP 1 ), [Ni(L)(NIP)]·2H 2 O(CP 2 ) and [Ni(L)(NDC)(H 2 O) 2 ](CP 3 )[L= N , N' -bis(pyridine-3-yl)thiophene-2,5-dicarboxamide, H 2 HIP=5-hydroxyisophthalic acid, H 2 NIP=5-nitroisophthalic acid, H 2 NDC=2,6-naphthalenedicarboxylic acid] by hydrothermal method, which were characterized by means of infrared spectra(IR), TG analyses, PXRD and single-crystal X-ray diffraction. The CP 1 is a 1D tubular structure based on [Ni-HIP] 2 loops and pairs of L ligands. CP 2 is a 2D 3,5-connected architecture, which consists of Ni-L linear chains and (Ni-NIP) 2 double chains. CP 3 is a 2D network, which features 4-connected topology. Solid-state luminescent behaviours of CP 1 —CP 3 were investigated. The CP 1 can detect Fe 3+ ions through luminescence quenching. The electrochemical properties of CP 1 buk-modified carbon paste electrode(CP 1 -CPE) has also been investigated, which has bifunctional electrocatalytic activity for oxidation of ascorbic acid and reduction of NO 2 − .
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AICHE JOURNAL
·
2025
·
IF 4
Xingchun Shi,Qian Zhang,Jinting Wu,Haijiao Lu,Hao Qin,Xiao-Dong Zhu,Jian Gao,Yong-Chao Zhang
Electrocatalytic oxidation of 5-hydroxymethylfurfural (HMFOR) offers an energy-efficient route to high value-added chemicals. There is an urgent demand for high-performance non-precious metal catalysts. Herein, the oxygen-deficient FeO/NiO/Ni was synthesized, which has high performance for HMFOR with a conversion rate of 100%, a selectivity of 98.6% for 2,5-furandicarboxylic acid (FDCA), and a Faradaic efficiency of 94.1% at 1.5 V (vs. RHE), superior to most reported non-precious metal catalysts. The efficient catalytic activity of FeO/NiO/Ni is attributed to the high specific surface area and enhanced adsorption and activation of HMF by oxygen vacancies, thereby reducing the rate-limiting step energy barrier of 5-hydroxymethyl-2-furancarboxylic acid to 5-formyl-furancarboxylic acid (*HMFCA→*FFCA). Ni 3+ acts as the active site for direct HMF oxidation catalysis, while Fe doping induces oxygen vacancies that facilitate the formation and stabilization of Ni 3+ species, enhancing their formation and catalytic functionality.
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Nature Communications
·
2025
·Vol. 16
·期 1
·10062
·
IF 15.7
Tian Dehua,Liang Yinlan,Zheng Zhaoke,Mao Liang,Cai Xiaoyan,Chen Yizhen,Wang Xiangxian,Liu Xiaolei,Li Juan,Wang Zeyan,Xue Can,Li Baojun,Lou Zaizhu
Photocatalytic methanol dehydration to dimethyl ether (DME) offers a sustainable alternative to energy-intensive thermocatalysis, yet its practical application remains constrained by low efficiency. Herein, we designed Ni-doped plasmonic W 18 O 49 nanowires that synergistically integrates low-coordinated W and Ni dual active sites with surface plasmon resonance for enhanced photocatalytic performance. The synergistic effect of W and Ni dual sites is amplified by plasmonic electron oscillations to facilitate the C-O bond cleavage and C-O-C coupling, driving efficient methanol-to-DME conversion. The optimized Ni 0.66 -W 18 O 49 achieves a DME yield of 133.7 ± 3.3 mmol g -1 h -1 with 98.7% selectivity under 400 mW cm -2 illumination. The versatility of the catalyst is demonstrated through C 2+ alcohol dehydration, achieving 40-80% rate enhancements and a recorded isobutylene yield of 3.7 mol g -1 h -1 . This study highlights the huge potential of rationally engineered plasmonic semiconductors in solar-driven chemical synthesis, particularly for C-O bond activation and coupling reactions.
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ChemSusChem
·
2020
·Vol. 13
·期 18
·5004-5014
·
IF 7.962
Xinyang Ji,Yongxia Zhang,Zhuo Ma,Yunfeng Qiu
Graphical Enhanced, three ways ! Oxygen vacancy-rich Ni/NiO nanosheets with Schottky heterointerface are protected by ultrathin N-doped carbon layer and display high urea oxidation reaction (UOR) performance. Charge polarization of active sites at Schottky interface, enhanced conductivity owing to the presence of defective energy level, and synergistic effect between anti-corrosion carbon layer and active sites are responsible for the enhanced specific UOR activity and long-term stability. H 2 production via electrocatalytic water splitting is greatly hindered by the sluggish oxygen evolution reaction (OER). The urea oxidation reaction (UOR) draws specific attention not only because of its lower theoretical voltage of 0.37 V compared with OER (1.23 V), but also for treating sewage water. Herein, Ni/NiO nanosheets with an ultrathin N-doped C layer containing a Schottky Ni and NiO heterointerface is constructed. Because of the self-driven charge redistribution at the heterointerface, janus charge domains are successfully created to drive the cleavage of urea molecules. Meanwhile, the synergistic effect between N-doped C and Ni/NiO restrains the deactivation of active sites in alkaline solution. The catalyst displays 1.35 V for UOR at 10 mA/cm 2 , 0.27 V lower than that of OER. The final potential increase is only 2 mV after long-term stability test of 12 h for UOR, much smaller than the uncoated sample (38 mV). The present work shows that C-coated transition metal nanomaterials with oxygen vacancies and a Schottky heterointerface are promising candidates for simultaneously boosting UOR with both high activity and long-term stability.
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Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 9
·1935-1943
·
IF 0.791
Zhang Hui,He Jin,Lei Bowen,Wen Jie,Jing Fangli,Ali Arshid Mahmood
Abstract The bimetallic Pt–Ni nano-catalysts with different platinum to nickel mass ratios supported on the carbon nanotubes (PtNi( x : y )/FCNTs-D) were successfully synthesized by the polyol method and applied to the H 2 generation from ammonia borane (AB) hydrolysis. Several state-of-the-art characterization methods were performed to explore the correlation between catalytic performance and the physicochemical characterizations of the catalysts. The results show that the optimum Pt : Ni ratio is critical to enhance the H 2 generation from AB hydrolysis and in this study, it is 1 : 2. The presence of carbon nanotubes enhanced the dispersion and stability of the Pt–Ni nanoparticles. The availability of more active sites and lowered binding energy of Pt 0 in PtNi(1 : 2)/FCNTs-D catalyst, lead to the increased catalytic activity of H 2 generation from AB hydrolysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zheng Wang,Jiawei Wang,Fumin Wang,Xubin Zhang,Xinyuan He,Shuai Liu,Zhengliang Zhang,Zhiwei Zhang,XingTao Wang
Elemental-doped is considered as an effective strategy to modulate the electronic structure of Metallic MoS 2 (i.e., 1T-MoS 2 ) and enhance its electrochemical performance. Herein, DFT is applied to predict the electronic structure of different transition metals (TMs) doped 1T-MoS 2 . Based on the results, stable Ni-doped 1T-MoS 2 (N 3 MS) is synthesized in a propionic acid (PA) aided system. Electrochemical tests show that N 3 MS possesses an excellent specific capacitance of 2461.2 F·g −1 at 1 A·g −1 and a cycle retention rate of 85.67 % at 10 A·g −1 for 1000 cycles due to the critical contribution of Ni-doped to electronic structure modulation. Meanwhile, in-situ Raman measurements show that the active sites of N 3 MS are Mo 3+ and Ni 2+ . The assembled N 3 MS//ZnO/ZnS-C hybrid device shows a specific capacitance of 242.28 F·g −1 at 1 A·g −1 , an excellent energy density of 65.96 Wh·kg −1 at the power density of 700 W·kg −1 and the excellent stability for up to 2000 cycles (77.26 % retention at 5 A·g −1 ). This work proves the significant contribution of elemental doping to modulate electronic structures and improve electrochemical performance.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Wenjuan Shen,Bingning Wang,Falong Jia,Zhihui Ai,Lizhi Zhang
In general, the final product of atrazine (ATR) degradation by reactive oxygen species is cyanuric acid bearing a stable s -triazine ring, which is not further oxidized under mild conditions. In this study, we demonstrate that the presence of Ni(II) can increase the aerobic ATR degradation rate of core–shell Fe@Fe 2 O 3 nanowires (CSFN) by 6 times and also achieve the cleavage of recalcitrant s -triazine ring. The cleavage of s -triazine ring in this novel system was confirmed by the measurements of formic acid and nitrite acid. On the basis of experimental results, a feasible mechanism was proposed to account for the promoted aerobic ATR degradation and the facile s -triazine ring cleavage as follows. First, Ni(II) adsorbed on the surface of CSFN was reduced to nickel metal, which favored the generation of active hydrogen (•H). The in-situ generated •H then reduced ATR to 4-ethylamino-6-isopropylamino-1,3,5-triazine intermediate of easy ring opening property, rather than the recalcitrant cyanuric acid. Finally, this ATR degradation pathway change promoted the aerobic ATR degradation and benefited the s -triazine ring cleavage. This study clarifies the importance of degradation pathway on the ring-opening of organic pollutants, and also provides a mild method to remove s -triazine herbicides with molecular oxygen and zero-valent iron.
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LANGMUIR
·
2024
·
IF 3.7
Xiyuan Zhou,Kaiwen Wang,Yang Wang,Yongyong Cao,Jiaxing Wang,Hanwen Hu,Guo Yang,Jixiang Hou,Peijie Ma,Chunlang Gao,Chaogang Ban,Youyu Duan,Zhen Wei,Xu Zhang,Cong Wang,Kun Zheng
Artificial photosynthesis for high-value hydrogen peroxide (H2O2) through a two-electron reduction reaction is a green and sustainable strategy. However, the development of highly active H2O2 photocatalysts is impeded by severe carrier recombination, ineffective active sites, and low surface reaction efficiency. We developed a dual optimization strategy to load dense Ni nanoparticles onto ultrathin porous graphitic carbon nitride (Ni-UPGCN). In the absence and presence of sacrificial agents, Ni-UPGCN achieved H2O2 production rates of 169 and 4116 μmol g–1 h–1 with AQY (apparent quantum efficiency) at 420 nm of 3.14% and 17.71%. Forming a Schottky junction, the surface-modified Ni nanoparticles broaden the light absorption boundary and facilitate charge separation, which act as active sites, promoting O2 adsorption and reducing the formation energy of *OOH (reaction intermediate). This results in a substantial improvement in both H2O2 generation activity and selectivity. The Schottky junction of dual modulation strategy provides novel insights into the advancement of highly effective photocatalytic agents for the photosynthesis of H2O2.
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