MOLECULES
·
2023
·Vol. 28
·期 8
·3344
·
IF 4.6
Han Rao,Weiping Li,Fuzhen Zhao,Yongfa Song,Huicong Liu,Liqun Zhu,Haining Chen
In order to increase the hardness, wear resistance and corrosion resistance of nickel-based coatings, pure nickel is often co-electrodeposited with silicon carbide (SiC) particles. However, SiC particles tend to agglomerate and precipitate in the bath, which reduces the amounts of nanoparticles and causes nonuniformity. Herein, we solve these problems by using binary non-ionic surfactants (Span 80 and Tween 60) to effectively disperse SiC particles (binary-SiC) in the bath, which suppresses nanoparticles agglomeration and leads to uniformly distributed SiC particles in the composite coatings. In comparison to the Ni/SiC coatings electrodeposited from the commonly used SDS-modified SiC, the coatings prepared with binary-SiC (Ni/binary-SiC) show finer crystallization and a smoother surface. In addition, the Ni/binary-SiC coatings exhibit higher hardness (556 Hv) and wear resistance (2.95 mg cm−2). Furthermore, higher corrosion resistance is also achieved by the Ni/binary-SiC coatings.Keywords:Ni/SiC composite coatings;co-electrodeposition;binary non-ionic surfactants;nanoparticle agglomeration;wear resistance
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Molecular Catalysis
·
2023
·
IF 4.6
Sihao Shu,Zhongze Wang,Xing Zhang,Haonan Shi,Shangzhen Feng,Jixiang Chen
Al 2 O 3 supported Ni-Sn alloy (Ni/Sn atomic ratio of 6) and Ni 3 Sn, Ni 3 Sn 2 and Ni 3 Sn 4 intermetallic compounds (IMCs) were prepared by co-precipitation method for the deoxygenation of fatty acid methyl esters to produce hydrocarbons. In comparison with metallic Ni, the catalytic evaluation and methyl propionate-TPD/TPSR results reveal that Ni-Sn IMCs remarkably inhibit the decarbonylation/decarboxylation pathway, C-C bond hydrogenolysis and methanation while promote the hydrodeoxygenation pathway, subsequently enhancing the yield of aiming hydrocarbons. Therein, 20%Ni 3 Sn 2 /Al 2 O 3 has the best performance, and the hydrocarbons yield reach about 99% in the deoxygenation of methyl octanoate and methyl palmitate. We suggest that the geometric and electronic effects of Sn contribute the excellent performance of Ni-Sn IMCs, and there is synergetic effect between Ni and Sn sites for the activation of C-O/C=O bond, for which a suitable Ni-Sn atomic spacing is very important. Finally, the catalyst stability and deactivation were also investigated.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Mengyao Liu,Taotao Gao,Hongmei Li,Bo Xie,Chunqiong Hu,Yong Guo,Dan Xiao
Based on the incidence of diabetes, developing glucose sensors of superior performance with low-cost transition metals (TMs) has been the direction of many researchers, amorphous TMs with highly efficient electrocatalytic properties have attracted our interest. On this basis, amorphous nickel–cobalt bimetallic N -doped carbon nanoparticles on carbon cloth (a-Ni 2 /Co 1 -NC/CC) were fabricated from ZIF-8, which was then used to fabricate an enzyme-free glucose sensor. It was found that the a-Ni 2 /Co 1 -NC/CC had the best response to glucose in 0.4 M NaOH at 0.55 V (vs Hg/HgO). As compared to crystal Ni 2 /Co 1 nanoparticle on carbon cloth (c-Ni 2 /Co 1 NPs/CC), cyclic voltammetry (CV) and chronoamperometry studies revealed that the a-Ni 2 /Co 1 -NC/CC showed a significant increase in the efficient of electrochemical oxidation of glucose under optimal conditions, exhibiting a high sensitivity of 2.455 mA mM −1 cm −2 with a low detection limit of 0.15 μM (S/N = 3). Furthermore, the constructed sensor based on a-Ni 2 /Co 1 -NC/CC also has long-term stability and can be used to detect glucose accurately in beverages (pure milk, coffee drinks, tea drinks, and soda water) with reasonable recovery from 95.6 % to 105.6 %. This study provides a simple and feasible method for the construction of a highly sensitive non-enzyme glucose electrochemical sensor based on amorphous TMs.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 5
·1261-1268
·
IF 2.5
Deng Hao-chen (Preston),Hao Qingzhu,Wang Yuhang
The COVID-19 pandemic that is still prevalent around the globe each day consumes massive disposable face masks and consequently lays a heavy burden on waste management. Meanwhile, the incineration of these medical wastes further escalates the already overwhelming carbon emission that leads to global warming and climate change. To offer a potential solution addressing medical waste and CO 2 emission challenges, we herein develop a synthetic protocol to upgrade face masks into Ni, N-doped graphene (Ni–N-C) sheet catalysts for selectively reducing CO 2 into CO electrochemically. The high specific surface area and the uniform dispersion of Ni active sites of the catalyst derived from a regular disposable face mask enable a near-unity CO Faradaic efficiency (FE) at the current density of 200 mA cm −2 . This study offers outside-of-the-box thinking to address environmental issues by turning medical wastes into CO 2 reduction catalysts.
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高影响因子
Materials
·
2023
·Vol. 16
·期 8
·3079
·
IF 3.4
Lifan Wang,Qinling Shi,Chun Zhan,Guicheng Liu
Ni-rich cathodes are expected to serve as critical materials for high-energy lithium-ion batteries. Increasing the Ni content can effectively improve the energy density but usually leads to more complex synthesis conditions, thus limiting its development. In this work, a simple one-step solid-state process for synthesizing Ni-rich ternary cathode materials NCA (LiNi0.9Co0.05Al0.05O2) was presented, and the synthesis conditions were systematically studied. It was found that the synthesis conditions have a substantial impact on electrochemical performance. Furthermore, the cathode materials produced through a one-step solid-state process exhibited excellent cycling stability, maintaining 97.2% of their capacity after 100 cycles at a rate of 1 C. The results show that a one-step solid-state method can successfully synthesize Ni-rich ternary cathode material, which has great potential for application. Optimizing the synthesis conditions also provides valuable ideas for the commercial synthesis of Ni-rich cathode materials.Keywords:lithium-ion batteries;Ni-rich cathode materials;one-step solid-state synthesis;electrochemical performance
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 9
·2359-2368
·
IF 2.7
Ma Junjie,Liu Hangcheng,Tao Zeyu,Liu Jianfeng,Yuan Binxia,Pan Weiguo,Shi Zhengrong
In order to reveal the relationship between the structure and the electrochemical oxygen reduction reaction (ORR) activity of different double transition metal decorated catalysts, three different double transition metal and N co-doped carbon material cathode catalyst materials (FeCo–NC, FeNi–NC and CoNi–NC) were prepared in this study. The FeCo–NC catalysts synthesised in this study still showed high ORR activity under alkaline conditions, with a half-wave potential of 0.783 V RHE , a mass activity (MA) of 11.36 A/g (0.77 V RHE ) and an ultimate current density of − 4.46 mA cm −2 ; after 30,000 cycles, the half-wave potential only decreased to 99.3% of the initial potential. Meanwhile, we employ MS to establish three different double transition metal and N co-doped graphene catalysts and to calculate and analyse their desorption properties, leading to the FeCo–NC material being the model with the highest ORR activity, which is consistent with the experimental results. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·51876-51886
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IF 5.8
Yu Weiting,Zhu Jieyun,Chen Sizhuo,Tang Juntao,Ye Jiexu,Song Shuang
The electrocatalytic reduction of CO 2 towards CO is one of the most desirable routines to reduce atmospheric CO 2 concentration and maintain a global carbon balance. In this work, a novel porous NiCu-embedded ZIF-derived N-doped carbon nanoparticle (NiCu@NCNPs) catalyst has been identified as an active, highly selective, stable, and cost-effective catalyst in CO 2 reduction. A CO selectivity as high as 100% has been achieved on NiCu@NCNPs which is the highest reported to date. The particle current density of CO on NiCu@NCNPs is around 15 mA cm –2 under the optimized potential at −0.9 V vs. RHE. The NiCu@NCNPs electrode also exhibits excellent stability during the five sequential CO 2 electroreduction experiments. The superior catalytic performance of NiCu@NCNPs in CO 2 RR can be related to its microstructure with high electrochemical surface area and low electron transfer resistance. Furthermore, a kinetic analysis has shown the formation of intermediate *COOH is the rate-determining step in CO 2 RR towards CO. According to the results of density functional theory (DFT) calculations, a low Gibbs-free energy change (∆ G ) for the rate-determining step leads to the enhanced catalytic performance of CO 2 RR on NiCu@NCNPs.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hui Wang,Hongyuan Chuai,Xiaoyi Chen,Jianlong Lin,Sheng Zhang,Xinbin Ma
Single-atom catalysts within M-N-C structures are efficient for electrochemical CO2 reduction. However, most of them are powdered and require a coating process to load on the electrode. Herein, we developed a facile approach to the synthesis of large-scale self-supported porous carbon nanofiber electrodes directly decorated with atomically dispersed nickel active sites using facile electrospinning, where poly(methyl methacrylate) was employed to tune well the distributions of pores located in carbon nanofibers. The above self-supported carbon nanofibers were applied as a gas diffusion electrode to achieve 94.3% CO Faraday efficiency and 170 mA cm–2 current density, which can be attributed to the effects of rich mesoporous structures favorable for adsorption and mass transfer of CO2 and single nickel catalysts effectively converting CO2 to CO. This work provides an efficient strategy to fabricate self-supported electrodes and may accelerate the progress toward industrial applications of single-atom catalysts in the field of CO2 electroreduction.
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高影响因子
Small
·
2019
·Vol. 15
·期 6
·1804769
·
IF 10.856
Hongjing Wang,Hongjie Yu,Ziqiang Wang,Yinghao Li,You Xu,Xiaonian Li,Hairong Xue,Liang Wang
Electrochemical reduction of N 2 to NH 3 provides an alternative strategy to replace the industrial Haber–Bosch process for facile and sustainable production of NH 3 . The development of efficient electrocatalysts for the nitrogen reduction reaction (NRR) is highly desired. Herein, a micelle-assisted electrodeposition method is presented for the direct fabrication of porous Au film on Ni foam (pAu/NF). Benefiting from its interconnected porous architectonics, the pAu/NF exhibits superior NRR performance with a high NH 3 yield rate of 9.42 µg h −1 cm −2 and a superior Faradaic efficiency of 13.36% at −0.2 V versus reversible hydrogen electrode under the neutral electrolyte (0.1 m Na 2 SO 4 ). The proposed micelle-assisted electrodeposition strategy is highly valuable for future design of active NRR catalysts with desired compositions toward various electrocatalysis fields.
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JOURNAL OF RARE EARTHS
·
2019
·
IF 2.846
Dingwen Kang,Jie Yu,Wenhui Ma,Min Zheng,Yunfei He,Pengfei Li
In this study, Cu/Ni-La 0.7 Sr 0.3 Cr 0.5 Mn 0.5 O 3– δ (LSCM) catalysts were synthesized via the citric acid-nitrate process (CNP) and chemical co-precipitation. The catalytic performance of Cu/Ni-LSCM catalysts on dry methane reforming was evaluated in a fixed-bed reactor at 550/650 °C and atmosphere pressure. Cu/Ni loading was investigated as an influencing factor, which led to 5 cases of samples according to the different Cu/Ni mass ratios. The catalysts were characterized by X-ray diffraction (XRD), field emission-scanning electron microscope (FE-SEM), Brunauer-Emmett-Teller (BET) measurement, X-ray photoelectron spectroscopy (XPS), hydrogen-based temperature-programmed reduction (H 2 -TPR) and thermos gravimetric analyzer (TGA). The results show that the methane conversion increases, the resistance against metal sintering increases and the carbon deposition drops after the copper is introduced. This optimum performance can be obtained under Case 3 (Cu:Ni:LSCM = 1:3:6 in mass ratio).
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 8
·4414-4428
·
IF 1.093
Liu Debao,Yang Ping
Metal-organic framework (MOF) has received much attention to prepare metal oxides, demonstrating many applications in sensing, catalysis and energy storage and conversion. Herein, a two-step procedure by a metal organic frameworks route was used fabricate ZnO dodecahedra, Co3O4
dodecahedra, ZnO/Co3O4 and Co3O4/NiO composites. The growth mechanisms for these unique structures are illustrated. As applications, ZnO dodecahedra perform remarkable sensitivity to ethanol in sensing experiments. The CO catalytic oxidation activity
of Co3O4 dodecahedra is employed and showed decreased catalytic performance with the increased calcinations temperature. ZnO/Co3O4 composites show enhanced electrochemical performance and photocatalytic activities, which result from its unique porous
structure, high specific surface area and the synergistic effect between ZnO and Co3O4. In addition, Co3O4/NiO composites show remarkable specific capacitance and excellent stability, superior to that of the pure Co3O4. Moreover,
this MOF-driven method could be utilizable to prepare other metal oxide for various applications.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Ling Zhang,Xijian Liu,Min Zhang,Haikuan Yuan,Lijuan Zhang,Jie Lu
We present here a novel, simple, low cost and green synthetic strategy for unique core-shell structured Fe 3 O 4 @C-MoO 2 -Ni composites without using extra reducing agent. The Fe 3 O 4 @C-MoO 2 -Ni composites exhibited better catalytic performance (reduction of 4-nitrophenol to 4-aminophenol) than previous common catalysts because highly dense satellite Ni nanoparticles firmly distributed on the porous carbon spheres. In addition, the Fe 3 O 4 @C-MoO 2 -Ni composites can be used as a pollutant remover due to fast adsorption rate and high adsorption capacity for dye in water. More importantly, owing to high magnetic susceptibility , the Fe 3 O 4 @C-MoO 2 -Ni composites show excellent performance for recyclable use by magnetic separation. Thus, the Fe 3 O 4 @C-MoO 2 -Ni composites have great potential as an ideal catalyst and adsorbent due to facile and green synthesis method, good stability, excellent recyclability, nontoxic and low cost properties.
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