ChemNanoMat
·
2023
·Vol. 9
·期 7
·e202300087
·
IF 3.8
Tingyi Wu,Huanglin Dou,Zhenxin Zhao,Junliang Zhou,Xiaomin Wang
Graphical The NiMoO 4 -modified separator can not only use its own strong polarity to chemisorption of polysulfides and effectively suppress the shuttle effect, but also can promote the mutual transformation between polysulfides of different phases, reduces the reaction potential barrier, and the redox kinetics is significantly improved. Besides, the hollow microsphere structure facilitates the penetration of electrolyte and establishes a pathway for ion/electron transport, which accelerates the Li + diffusion rate. Lithium-sulfur (Li−S) batteries are considered to be the most promising candidates for achieving low-cost, high-energy density systems. The serious shuttle effect of polysulfides (LiPS) and the sluggish redox kinetics have become major obstacles to the practical application of Li−S batteries. Herein, a hollow microsphere structure of transition bimetallic oxide nickel molybdate (NiMoO 4 ) was prepared by hydrothermal reaction and calcination method. It was used as a separator coating material to inhibit LiPS shuttle and promote efficient redox conversion of sulfur species. The hollow microsphere structure not only possesses a large internal space to physically confine LiPS but also exposes abundant active sites to enhance the redox kinetics of LiPS. The NiMoO 4 shows superior adsorption ability for LiPS and accelerated ion/electron transport rates compared to NiO, thus facilitating the anchoring-conversion-diffusion processes of polysulfides. Benefiting from this versatility, the Li−S batteries with NiMoO 4 -PP exhibit a high discharge specific capacity of 1354.5 mAh g −1 at 0.1 C. In addition, the battery exhibits excellent cycling stability with a capacity decay rate of 0.027% for 500 cycles at 2 C. These results demonstrate the potential application of NiMoO 4 -based electrocatalysts in high-performance Li−S batteries.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Yingping Zheng,Weidong Bao,Guoning Liu,Shaopeng Qi,Dehua Yu,Kaili Ma,Zhenrong Chen,Xiangting Hu,Yongbing Lou
Ultrasmall Cu/Ni-NiOx nanoparticles (NPs) had been successfully prepared by attaching and growing Ni-NiOx NPs on the surface of Cu NPs and then uniformly dispersed onto graphene (G) surface. High-angle annular dark-field–scanning transmission electron microscopy (HAADF-STEM) characterization confirmed that Ni-NiOx NPs were uniformly distributed on the surface of Cu NPs. The catalytic methanolysis of ammonia borane (AB) proved that Cu/Ni-NiOx NPs possessed high catalytic hydrogen (H2) evolution activity, and the highest turnover frequency (TOF) was 17.72 mol H2·mol–1 Cu·min–1. Comparative experiments revealed that the high catalytic activity originated from the abundant catalytic active sites of Cu/Ni-NiOx NPs. The attachment of Ni-NiOx on the surface of Cu NPs that dispersed on G (G-Cu/Ni-NiOx) can not only effectively improve the antioxidative performance of Cu NPs under ambient conditions but also promote the methanolysis of AB to produce H2.
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Green Energy & Environment
·
2021
·
IF 8.207
Ruichang Xue,Mengwei Guo,Zhuoming Wei,Qibo Zhang
Ni–Fe bimetallic electrodes are currently recognized as a kind of benchmark transition metal-based oxygen evolution reaction (OER) electrocatalysts. Facile synthesis of Ni–Fe bimetallic electrode materials with excellent catalytic activity and satisfied stability by a simple and low-cost route is still a big challenge. Herein, well-defined Ni–Fe nanoparticles in-situ developed on a planar Fe substrate (Ni–Fe NPs/Fe) is fabricated via a facile one-step galvanic replacement reaction (GRR) carried out in an Ethaline-based deep eutectic solvent (DES). The prepared Ni–Fe NPs/Fe exhibits outstanding OER performance, which needs an overpotential of only 319 mV to drive a current density of 10 mA cm −2 , with a small Tafel slope of 41.2 mV dec −1 in 1.0 mol L −1 KOH, high mass activity (up to 319.78 A g −1 at an overpotential of 300 mV) and robust durability for 200 h. Impressively, the Ni–Fe bimetallic oxygen-evolution electrode obtained from the Ethaline-based DES is catalytically more active and durable than that of its counterpart derived from the 4.2 mol L −1 NaCl aqueous solution. The reason for this is mainly related to the different morphology and surface state of the Ni–Fe catalysts obtained from these different solvent environments, particularly for the differences in phy–chemical properties, active species formed and deposition kinetics, offered by the Ethaline-based DES.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianmei Pan,Yahai Zhang,Yi Guan,Yingnan Yan,Hua Tang,Xianglong Liu,Mengdi Wang,Xiangxin Wei
The development of hydrogen (H 2 ) production photocatalyst with low cost, non-precious metal and high-activity for commercial application is a long-term target and challenge. In this work, novel silicon carbide (SiC) nanofibers/graphitic carbon nitride (g-C 3 N 4 ) nanosheets (SiC/CNNS) decorated via multipurpose nickel (Ni) nanoparticles were prepared by an easy heat treatment followed by hydrothermal method. The tight Ni interface layers as cocatalyst and electron transfer mediator can significantly enhance the H 2 production property over SiC/CNNS nanoheterojunctions under light-emitting diode (LED) illumination. The optimal Ni/SiC/CNNS with a mass fraction of 10% Ni loading shows the most superior H 2 -generation rate of 6183 μmol g −1 h −1 , which is approximately 53, 3 and 227 times compared to CNNS, 10 %Ni/CNNS and SiC/CNNS, respectively. The metallic Ni nanoparticles play the leading and multifunctional roles in improving photocatalytic activity, including collecting the photo-generated electrons efficiently, transferring and separating the charge carriers rapidly, facilitating the H 2 -production kinetics and decreasing the overpotentials of surface reactions for H 2 -production. It is highly expected that the multipurpose and non-precious metal cocatalyst to form tight interface layers can supply a simple and universal strategy to design high-efficiency cocatalyst-semiconductor–semiconductor photocatalysts for H 2 production.
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FUEL
·
2021
·
IF 6.609
Tao Pan,Sida Ge,Mengnan Yu,Yana Ju,Ran Zhang,Pei Wu,Kuanyu Zhou,Zhijie Wu
Zn modified ZSM-5 zeolite supported Ni bifunctional catalysts were prepared by in-situ hydrothermal synthesis (Zn-Ni-ZSM-5), co-impregnation method (Zn-Ni/ZSM-5) as well as combining in-situ hydrothermal synthesis of Zn-ZSM-5 and sequential impregnation of Ni (Ni/Zn-ZSM-5) and used for the selective converting olefin to aromatics applicable for FCC gasoline hydro-upgrading. The Lewis (L) acid sites generated by ZnOH + species and hydrogenation active sites from Ni 0 species were varied with preparation method, in which their locations at the external surface or micropores of zeolite changed the acid properties of catalysts. Comparing to the Zn-Ni/ZSM-5 from the co-impregnation method, direct in-situ hydrothermal method could incorporate Zn and Ni species within zeolite, which makes the strong interaction between the metal species and the framework Al to form medium-strong L acids (ZnOH + /NiOH + ). This leads to the decrease of ratio of Brønsted acid sites to L acid sites (B/L) from 0.40 to 0.12 and the difficulty in reducing of Ni cations to Ni 0 from 57% to 30% Ni 0 percent. Ni/Zn-ZSM-5 sample prepared by incorporating Zn species into micropores and sequential depositing Ni species at the external surface of zeolite possesses a low B/L ratio similar to Zn-Ni-ZSM-5 (0.20 versus 0.12) but a much higher Ni 0 percent (52% versus 30%). Zn-Ni-ZSM-5 shows closer intimacy between Zn and Ni species comparing to Zn-Ni/ZSM-5 and Ni/Zn-ZSM-5. For the 1-hexene aromatization, the formed iso -alkene at acid sites was quickly saturated to iso -alkanes by the adjacent Ni 0 particles over Ni-Zn-ZSM-5 catalyst in hydrogen steam. However, the location of aromatization active sites (ZnOH + , L acid sites) in micropores and hydrogenation active sites (Ni 0 species) on external surface of Ni/Zn-ZSM-5 makes the tandem conversion of n-alkene → iso -alkene → aromatics, rather than the n-alkene → iso -alkene → iso -alkane. Thus, Zn-Ni-ZSM-5 with close intimacy of ZnOH + and Ni 0 particles shows a high iso -alkane selectivity (27.9% iC 4 + ), while Ni/Zn-ZSM-5 exhibits a high aromatics selectivity (39.6 %) in the conversion of 1-hexene in hydrogen steam. Similar results have also found in the conversion of n-heptane. Here, the control of the intimacy of Zn and Ni in ZSM-5 zeolites has been realized to be a good protocol to adjust the selective conversion of olefins/alkanes to aromatics versus iso -alkanes.
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RSC Advances
·
2021
·Vol. 11
·期 60
·37932-37941
·
IF 3.361
Ge Guo,Wenzhi Li,Tauseef Ahmed,DuoDuo Hu,Ru Cui,Baikai Zhang,Xia Zhang
Non-noble bimetallic NiMo supported on zeolitic imidazolate framework-derived porous carbon (NiMo@FDC) catalyst for lignin depolymerization has been successfully developed. The synergism between Ni and Mo species in NiMo@FDC catalyst could promote the catalytic cleavage of C–O linkages in Kraft lignin. At a low reaction temperature of 240 °C and under 4 MPa H2, the lignin liquefaction yield was 98.85 wt% and minimum coke yield was 1 wt%, particularly when using 10%NiMo@FDC catalyst. Additionally, at a high reaction temperature of 300 °C and under 2 MPa H2, there was an overall yield of 86 wt% of liquid product and 42 wt% of petroleum ether soluble product. The higher heating value (HHV) increased from 27.65 MJ kg−1 to 34.11 MJ kg−1. In the cycling experiment, the bifunctional catalyst also demonstrated reversability and stability. The synergy of Ni hydrogenation sites and Mo coupled adsorption sites identified a possible mechanism path, which could offer considerable potential for lignin depolymerization.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qianzhen Fang,Ni Liu,Yanling Gu,Hailan Yang,Shujing Ye,Zhongzhu Yang,Gaobin Chen,Xiaofei Tan,Xinjiang Hu
Metal-based materials are widely regarded as promising catalysts for activating peroxymonosulfate (PMS) to remove refractory organic contaminants with high efficiency. In our study, Ni-Fe layered double hydroxide (LDH)-biochar (BC) composite-induced PMS-based advanced oxidation process (AOP) was utilized to elucidate the degradation of tetracycline hydrochloride (TCH). In Ni-Fe LDH-BC/PMS system, more than 99% TCH (45 μM) could be removed effectively at low doses of oxidant (PMS, 0.10 mM) and catalyst (Ni-Fe LDH-BC, 0.10 g/L) addition within 80 min. Besides, the Ni-Fe LDH-BC/PMS system showed high resistance to some inorganic anions, and the Ni-Fe LDH-BC composite possessed excellent reusability in the degradation of TCH (>99% in four cyclic experiments). The reaction mechanisms were investigated via electron paramagnetic resonance detection, chemical quenching tests, probe experiments, and electrochemical measurements. These results indicated that the electron-shuttle mechanism played the dominant role in the removal of TCH. It is worth noting that determination of PMS concentration can reflect the reliability of quenching experiments. In the Ni-Fe LDH-BC composite, BC could not only improve the dispersion of Ni-Fe LDH, but also increase the conductivity of Ni-Fe LDH. Overall, a successful modification strategy was proposed in our study to improve the catalytic property of Ni-Fe LDH, and reaction mechanisms of TCH degradation were discussed deeply and comprehensively.
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CATALYSIS LETTERS
·
2018
·Vol. 149
·期 1
·77-83
·
IF 2.911
Wang Hefang,Fu Qinglong,Zhang Guanyan,Sun Yangyang
Abstract A safe and reductant-free method based on co-reduction of nickel and copper oxides via vacuum thermal treatment has been developed for the synthesis of Ni–Cu alloy nanofibers, which includes electrospinning of a nickel acetate/copper acetate/polyvinylpolypyrrolidone (NiAc/CuAc/PVP) precursor solution, followed by vacuum thermal reduction. On account of the synergistic effect between Cu and Ni, the Ni–Cu alloy nanofibers catalyst with an optimal composition exhibits good catalytic performance for the decomposition of hydrous hydrazine in NaOH solution. Graphical Abstract Ni–Cu alloy nanofibers have been prepared by a vacuum thermal co-reduction method, and further used as catalysts for hydrous hydrazine decomposition.
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CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Jing-Yu Li,Ming-Yu Qi,Yi-Jun Xu
Integrating selective organic synthesis with hydrogen (H 2 ) evolution in one photocatalytic redox reaction system sheds light on the underlying approach for concurrent employment of photogenerated electrons and holes towards efficient production of solar fuels and chemicals. In this work, a facile one-pot oil bath method has been proposed to fabricate a noble metal-free ultrathin Ni-doped ZnIn 2 S 4 (ZIS/Ni) composite nanosheet for effective solar-driven selective dehydrocoupling of benzyl alcohol into value-added C–C coupled hydrobenzoin and H 2 fuel, which exhibits higher performance than pure ZIS nanosheet. The remarkably improved photoredox activity of ZIS/Ni is mainly attributed to the optimized electron structure featuring narrower band gap and suitable energy band position, which facilitates the ability of light harvesting and photoexcited charge carrier separation and transfer. Furthermore, it has been demonstrated that it is feasible to employ ZIS/Ni for various aromatic alcohols dehydrocoupling to the corresponding C–C coupled products. It is expected that this work can stimulate further interest on the establishment of innovative photocatalytic redox platform coupling clean solar fuels synthesis and selective organic conversion in a sustainable manner.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Youlin Wu,Haiyan Zhang,Youji Li,Zhiliang Jin
2D Cu 2 S snowflakes and 2D Ni-MOFs flakes were synthesized by hydrothermal method , and Ni-MOFs were calcined with sodium hypophosphite at 200 °C to form Ni-MOFs-P (Ni-MOFs/Ni 2 P). In the physical mixing process, since the -formation temperature of Cu 2 S is at 80 °C, the physical mixing temperature was controlled at 80 °C, which is advantageous for achieving a close 2D/2D contact. The results showed that 15 vol% TEOA with pH = 10 was used as sacrificent reagent under 5 W LED simulated visible light. 20 mg of EY was used as a photosensitizer . CNP60 had the best hydrogen evolution performance within 5 h, which was 3122.76 μmol g −1 h −1 . The hydrogen evolution rate of CNP60 is 8.72 fold, 3.37 fold, and 91.85 fold faster than that of Ni-MOFs, Ni-MOFs-P, and Cu 2 S, respectively. Ni-MOFs phosphating and Cu 2 S loading can reduce the photocatalyst's photogenerated electron and hole recombination efficiency. This significant improvement was achieved through XRD, SEM, TEM , XPS , UTV-Visible DRS , transient photocurrent , steady-state fluorescence, short fluorescence, related substance reporting studies, radical hydroxyl trapping, and more. The results show that the 2D/2D assembled CNP can effectively enhance the ability to reduce H∗, and a possible photocatalytic hydrogen production mechanism is proposed.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Lijian Wang,Yanqun Zhu,Guangshi Fu,Yong He,Yanwei Zhang,Zhihua Wang
The sulfur–iodine (SI) cycle is deemed to be one of the most promising alternative methods for large-scale hydrogen production by water splitting, free of CO 2 emissions. Decomposition of hydrogen iodide is a pivotal reaction that produces hydrogen . The homogeneous conversion of hydrogen iodide is only 2.2% even at 773 K [1]. A suitable catalyst should be selected to reduce the decomposition temperature of HI and attain reaction yields approaching to the thermodynamic equilibrium conversion. However, residual H 2 SO 4 could not be avoided in the SI cycle because of incomplete purification. The H 2 SO 4 present in the HI feeding stream may lead to the poisoning of HI decomposition catalysts. In this study, the activity and sulfur poisoning of Ru and Ni catalysts loaded on carbon and alumina , respectively, were investigated at 773 K. HI conversion efficiency markedly decreased from 21% to 10% with H 2 SO 4 (3000 ppm) present, which was reversible when H 2 SO 4 was withdrawn in the case of Ru/C. In the case of Ru/C and Ni/Al 2 O 3 , catalyst deactivation depends on the concentration of H 2 SO 4 ; the higher the concentration of H 2 SO 4, the greater the severity of deactivation. Catalysts before and after sulfur poisoning were characterized by transmission electron microscopy (TEM), energy-dispersive X-Ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Experimental results and characterization of poisoned and fresh catalysts indicate that the catalyst deactivation could be ascribed to the competitive adsorption of sulfur species and change in its surface properties.
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European Physical Journal Plus
·
2026
·Vol. 141
·期 9
·1057
·
IF 2.9
Yan Xiang,Fan Hui,Li YuHang
To further enhance the mechanical properties of metal surfaces, Ni–Co–TiC nanocomposite coatings were successfully fabricated on 304 stainless steel substrates utilizing a custom-built jet electrodeposition system. This study systematically investigated the effects of cathodic current density and TiC particle concentration in the electrolyte on the growth kinetics, microstructural morphology, phase composition, crystallite size, microhardness, and tribological properties of the composite coatings. The results indicate that as current density and TiC particle concentration increase, the mass deposition rate, compactness, and mechanical properties of the coatings initially improve before subsequently declining. Under the optimal processing parameters (a current density of 70 A/dm 2 and a TiC particle concentration of 10 g/L), the high-velocity impingement of the jet flow and the electric field force achieved an optimal synergy. This effectively suppressed nanoparticle agglomeration and facilitated the uniform dispersion of TiC within the Ni–Co matrix. X-ray diffraction analysis verifies that the Ni–Co matrix retains a face-centered cubic solid solution structure, and the average crystallite size is refined to 15.2 nm under the optimized condition. Driven by the combined mechanisms of grain refinement and Orowan dispersion strengthening, the optimized coating reaches a peak microhardness of 654.24 HV and reduces the average friction coefficient to 0.265, achieving a favorable balance between mechanical strength and tribological performance. This study elucidates the regulatory mechanisms of jet electrodeposition parameters on the microstructural and macroscopic properties of composite coatings, providing a crucial theoretical basis for the engineering fabrication of high-performance, wear-resistant composite coatings.
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