APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Wenxiu Yan,Yongli Shen,Chao An,Lina Li,Rui Si,Changhua An
Tuning the crystal phase of metals and constructing the metal-oxide interface provide a new way to improve oxygen evolution reaction (OER) kinetics. Herein, we developed a room-temperature plasma topology conversion of Fe 3+ doping Ni(OH) 2 nanosheets to porous hcp Ni engineered by FeOx clusters. X-ray absorption fine spectra established that they were formed via Ni-O-Fe bonds. The metal oxide-metal interfaces with benign geometry and electronic structures enable it to be applied as efficient electrocatalyst, exhibiting overpotential of 226 mV at 10 mA cm −2 . In situ Raman spectra show that the interfacial action of FeOx cluster with Ni can stimulate the generation of active intermediate of γ-NiOOH, effectively promoting OER rate. DFT calculation further demonstrates the interaction accelerates desorption of O 2 molecules on the surfaces. This work provides a simple and robust strategy to synthesize oxide clusters engineering metastable metal nanocatalysts, offering new platform to explore efficient catalysts in various fields.
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高影响因子
Journal of Energy Chemistry
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2020
·
IF 7.216
Shuangxi Lin,Ziwen Hao,Jindong Shen,Xiao Chang,Shouying Huang,Maoshuai Li,Xinbin Ma
The metal-support interaction is of critical importance to enhance the catalytic activity and selectivity. However, it is still challenging to construct an appropriate interaction starting from the catalyst fabrication and/or activation. We herein established low-temperature treatment of Ni 2+ ions impregnated on ceria in reductive atmosphere and reduction–oxidation cycles as effective approachs to regulate the metal-support interaction and raise the catalytic performance in the CO 2 methanation. The proposed construction approach yielded Ni/CeO 2 that displayed highly dispersed Ni nanoparticles in contact with CeO 2 (111) and (100) facet, higher density of surface oxygen vacancies and larger amounts of weak basic sites relative to the reference samples, which increased the capacity for H 2 and CO 2 adsorption/activation. The interaction resulted in appreciably (2–3 fold) higher activity in the CO 2 methanation with maintaining almost full selectivity to CH 4 and high stability. Coverage of Ni surface by CeO 2− x thin layer as a typical structure of strong metal-support interaction resulting from high-temperature reduction, can be alleviated via reduction–oxidation cycles. We also demonstrate the activation treatment-determined metal-support interaction effect can generally extend to (TiO 2 and ZrO 2 ) supported Ni catalysts.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Lingjiao Li,Jing Xu,Binyi Su
In the field of photocatalysis, most of the photocatalysts are semiconductors. Recent years, there have been many photocatalytic systems related to non-semiconductor catalysts. In this paper, a photocatalytic hydrogen evolution system of hexagonal Ni(OH) 2 derived from CuNi bimetal is obtained by classical hydrothermal method. The derived hexagonal Ni(OH) 2 can promote the separation of photogenerated electron-hole pairs and greatly improve the effect of photocatalytic hydrogen evolution. The electron-hole pair comes from the surface plasmon resonance (SPR) effect of Cu from CuNi composite. It is worth noting that photoluminescence spectra and photoelectrochemical experiments have confirmed that the CuNi-5 complex can effectively improve space charge separation. The results of linear scanning voltammetry show that the material has high current response characteristics. This system gives a practical solution for planning and synthesizing non-semiconductor catalysts with high photocatalytic activity.
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高影响因子
HYDROMETALLURGY
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2020
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IF 3.338
Xintao Yi,Guangsheng Huo,Wei Tang
The extraction of Fe(III), Ni(II) and Co(II) from a Ni(II)-Co(II) solution containing Fe(III) was analyzed in a chloride medium using a mixed extractant consisting of 50% ( v /v) tributyl phosphate (TBP), 20% (v/v) 2-octanol and 30% (v/v) kerosene. The extraction of 0.5 mol/L Fe(III) in 4 mol/L hydrochloric acid reached 97%, and the consumption of chloride ions was investigated. Nickel(II) ions were not detectably extracted by TBP, with an inclusion of <1.1%. Compared with Fe(III), TBP extracted only a small amount of Co(II). The iron complexes formed by TBP and 2-octanol were [H 2 FeCl 4 · 2TBP] and [H 2 FeCl 4 · 5(2-octanol)], and the possible compositions of Co-containing extracts were [H 2 CoCl 4 · 2TBP] and [H 2 CoCl 4 ] · n[2-octanol]. An industrial process consisting of two-step extraction was designed to achieve the separation of Co(II) and Fe(III), resulting in a decrease in the Fe/Co mass ratio from 0.46 to <3.5 × 10 −4 in the raffinate.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Linhua Rao,Jiayi Tang,Sufei Hu,Liguo Shen,Yanchao Xu,Renjie Li,Hongjun Lin
While electroless nickel plating is considered as a promising candidate for fabrication of metallized polymer composite membranes with high performance, it suffers from problems of complex and high-cost pretreatment procedure, hindering its large-scale implementations. It is hypothesized that, inkjet printing integrated with electroless plating (ELP) can serve as a facile and economical membrane fabrication method to overcome above problems. The new method proposed in this study was processed by inkjet printing silver ions and pyrrole inks as catalytic layer followed by electroless Ni deposition on polypropylene (PP) membrane surface. Successful modification was verified by characterizing the surface morphology and elemental compositions of the membranes. In comparison to the pristine PP membrane, the PPy-Ag/Ni modified membrane demonstrated lower surface resistance (2.3 Ω), better hydrophilicity (44.9°) and higher pure water flux (1135.1 L m −2 h −1 ). When applying an external electric field (10.0 V cm −1 ), the average flux of the PPy-Ag/Ni membrane for yeast filtration increased from 107.8 to 137.7 L m −2 h −1 , which was about 2.0 times higher than that of the pristine PP membrane. Meanwhile, the PPy-Ag/Ni membrane possessed a maximum flux recover rate when applied with an external electrical field. This work provided a facile and efficient approach for fabrication of composite conductive membranes.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Hao Gu,Qin Zhong,Yiqing Zeng,Shule Zhang,Yunfei Bu
The supercapacitive performance of high-rate capacity and long-term cycling stability is still a big challenge for electroactive materials. Herein, Ni and Zn co-substituted Co carbonate hydroxide (NiZn-CoCH) flowers array is self-assembled on nickel foams (NFs) using l -ascorbic acid as a nanostructure inducer. The NiZn-CoCH flowers, consisting of silk-like nanosheets, are deservedly large electrode-electrolyte contact area and suitable ion-diffusion channel. The nanostructure and Ni and Zn co-substitution significantly improve energy storage performance. This electrode exhibits a high specific capacitance of 2020.8 F g −1 at 1 A g −1 with high-rate capacity (remain 80.2% at 10 A g −1 ) and 5000-cycle stability (almost unchanged after 1500 cycles at 10 A g −1 ). Additionally, an assembled asymmetric supercapacitor (ASC) device of NiZn-CoCH//activated carbon (AC) achieves a high energy density of 29.6 Wh kg −1 at a power density of 375 W kg −1 and only a 0.5% decrease of the capacitance after 2500 cycles. This facile and novel preparation method, using l -ascorbic acid, may be promising for industrial production of electroactive materials for the high-performance energy storage and conversion devices.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Yutong Wang,Lun Pan,Yixin Chen,Guoqiang Shen,Li Wang,Xiangwen Zhang,Ji-Jun Zou
Ni-based alloys are considered as the efficient catalyst for hydrogen-storage materials decomposition. Herein, we applied an in-situ melt-quenching method to dope Mo in Ni-based alloy for catalytic hydrogen evolution from hydrogen-storage materials. Importantly, Mo doped Ni-based catalyst exhibits more than 6 times higher TOF value than that of pure Ni both in AB hydrolysis and hydrazine decomposition, because Mo acts as an electron donor to improve the reducibility of Ni. Hydrogen evolution kinetics were studied over a range of temperatures (303–353 K) and initial feed concentrations (catalyst/hydrogen-storage materials (wt/wt) ratios = 0.2–10). Under optimal reaction conditions, the H 2 evolution rate reaches 1.92 mol H 2 /(mol cat min) and 0.05 mol H 2 /(mol cat min) in the hydrolysis of ammonia borane and decomposition of hydrazine, which are 6.42 and 6.44 times higher than undoped Ni catalyst, respectively. And the apparent activation energy of ammonia borane hydrolysis and hydrazine decomposition were evaluated to be 26.66 ± 3.31 kJ/mol and 40.01 ± 3.38 kJ/mol, respectively.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yanyan Wu,Ying Li,Mengke Yuan,Zhe Lü,Lingling Xu,Bo Wei
Developing efficient and nonprecious electrocatalysts for oxygen evolution reaction (OER) is crucial for the hydrogen generation via water splitting. Here we report the direct growth of heterostructural Ni 2 P–Fe 2 P hybrid electrocatalysts on NiFe foams. The redox engineered NiFe foam (rNF) significantly enhances the OER performance. Among prepared catalysts, Ni 2 P–Fe 2 P/rNF performs the highest OER activity, driving the current densities of 10 and 100 mA cm −2 at low overpotentials of 218 and 270 mV in 1 M KOH, respectively. Meanwhile, it can maintain 100 mA cm −2 for 24 h without obvious degradation. The morphology and composition of NFP/rNF after OER test were carefully studied. This work suggests that self-supported bimetal phosphides of NFP/rNF is an efficient and durable electrode material for water oxidation .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yunpeng Qu,Yulin Wu,Jiada Wu,Kai Sun,Runhua Fan
Metacomposites with simultaneous epsilon-negative and mu-negative property have drawn tremendous attentions due to their promising applications in electromagnetic field. Herein, Ni/CaCu 3 Ti 4 O 12 (Ni/CCTO) metacomposites were prepared by low-temperature pressureless sintering method. It was observed that Ni chains were gradually interconnecting to each other with increasing Ni content, and a percolation behavior was observed. Epsilon-negative property was obtained above percolation threshold attributing to the synergistic effect of induced electric dipole and low-frequency plasma oscillation in Ni networks, which was explained by the superposition of Drude and Lorentz model. Mu-negative property was observed above ∼34 MHz and ∼120 MHz for 60 wt% and 70 wt% Ni/CCTO composites respectively, which may originate from the combined effects of diamagnetic response, domain wall motion and gyromagnetic spin rotation. Hence, simultaneous epsilon-negative and mu-negative property at radio-frequency region was realized in Ni/CCTO metacomposites. Besides, the composites presented hopping conduction behavior, and then changed into metal-like conduction behavior with increasing Ni content. The impedance response of Ni/CCTO composites clarified the correlation between epsilon-negative and inductive character. This work could broaden the scope of metacomposites and pave its way to potential applications of electromagnetic shielding, novel antenna, and high- k capacitors.
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高影响因子
ENERGY & FUELS
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2020
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IF 3.421
Jun Hu,Mingxing Zhao,Bingxing Jiang,Shiliang Wu,Ping Lu
Direct hydrogenolysis of native lignin in biomass into monomeric phenols has received increasing attention. In this work, catalytic transfer hydrogenolysis of native lignin from birch, pine, and corn stalk was studied over a Ni–Pd bimetallic catalyst using isopropanol as the in situ hydrogen source. The bimetallic Ni50Pd50/SBA-15 exhibited higher activity than the monometallic counterparts in catalytic transfer hydrogenolysis of native birch lignin, affording 37.2 wt % monophenols at 245 °C after 4 h. 4-Propylsyringol had the highest yield of 18.9 wt % with a selectivity of 51%. Among the three biomass feedstocks, native lignin in birch gave the highest monophenol yield, which is 2.2 times that of native pine lignin (16.9 wt %) and 4.6 times that of native corn stalk lignin (8.1 wt %). FTIR and Py–GC MS analyses of the starting biomasses and the depolymerization solid products revealed that native birch lignin has the highest depolymerization efficiency with the least active lignin remaining.
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高影响因子
CELLULOSE
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2020
·Vol. 27
·期 13
·7591-7605
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IF 4.21
Wang Haiyong,Hu Xiaohong,Liu Siwei,Cai Chiliu,Zhu Changhui,Xin Haosheng,Xiu Zhongxun,Wang Chenguang,Liu Qiying,Zhang Qi,Zhang Xinghua,Ma Longlong
The bi-functional Ni–W@C catalysts were prepared by one-pot reduction–carbonization method and used in hydrogenolysis of cellulose as well as raw lignocellulosic biomass to chemicals. The catalytic performance for cellulose conversion showed that it was more favorable for ethylene glycol (EG) production, obtaining the highest EG yield 60.1% over the Ni–W@C 700 catalyst. The Ni–W@C bimetallic catalysts are systematically characterized with BET, XRD, Raman, XPS, TEM techniques and experiments to probe the active catalytic sites of the catalysts. The effects of calcination temperature of Ni–W catalysts, reaction time, temperature and H 2 pressure on cellulose hydrogenolysis were investigated in detail. The Ni particles could lead to produce more W 5+ active sites, which promotes the glucose retro-aldol condensation to break the target C–C bonds. Metallic Ni catalyzed C=O hydrogenation and C–C hydrogenolysis, which could also avoid the coke formation. The EG selectivity was dependent on the synergy of WO x and Ni metal sites. In addition, this synergistic effect between the metal and WO x could promote lignin component degradation in direct conversion of untreated raw lignocellulosic biomass, obtaining the propyl monophenolics including guaiacylpropane, syringylpropane and p-n-propylphenol with a total yield of 17.3 wt% besides EG.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 18
·22639-22647
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IF 3.056
Ren Qiangqiang,He Limo,Hu Song,Li Hanjian,Li Shanxue,Deng Zengtong,Song Gongxiang,Su Sheng,Wang Yi,Xiang Jun
The formation of highly graphitic phenolic resin chars (GPFCs) during catalytic carbonization at relatively low reaction temperature (1200–1600 °C) using novel Ni-Zn-B alloy catalyst with small amount of addition (5–15%) was systematically studied. Only two kinds of graphites (turbostratic graphite and ordered graphite) can be found in GPFCs after catalytic carbonization with Ni-Zn-B and their proportions were changed with reaction conditions. When Ni-Zn-B was involved at 1200–1600 °C, the phenolic resin char was fully transformed to be graphite, and ordered graphite content increased to 28.42% at 1400 °C, which was also almost twice of ordered graphite content in the char catalyzed by pure Ni. But the order graphite content would decrease due to sintering at higher reaction temperature. The addition of Zn and B can promote nickel-based alloy catalytic action by reducing melt point and accelerating graphitization respectively. It was also found that ordered graphite content could be used as a key evaluation parameter to directly reflect the quality of GPFCs based on detailed characteristics analysis. The model between three reaction conditions (reaction temperature, retention time, catalyst content) and ordered graphite content was built with artificial neural network (ANN), and the prediction accuracy of ANN was high up to 91.48%.
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高影响因子
危险品化学品经营许可证（带存储）