APPLIED CLAY SCIENCE
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2021
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IF 5.467
Atian Xie,Jiuyun Cui,Jin Yang,Chunxiang Li,Yi Wang,Jiangdong Dai
The effective treatment of oily wastewater is of great significance for the protection of the ecological environment and human health. Aiming to prepare a membrane with excellent antifouling properties, a new active antifouling carbon cloth@Ni-Co LDH/Ag (CC@LDH/Ag) membrane was reported here via in situ hydrothermal growth and followed photo-deposition methods. The effects of Ag deposition on self-cleaning ability and surface wettability of CC@LDH/Ag membrane were studied. The experimental results showed CC@LDH/Ag membrane is superhydrophilic/underwater superoleophobic, and exhibited high separation efficiency (>98.6%) and high flux (6551–22,050 L m −2 h −1 ) for different kinds of oil/water mixtures. Moreover, CC@LDH/Ag membrane also displayed excellent environmental and mechanical durability. Good self-cleaning ability enabled CC@LDH/Ag membrane to be separated at least 30 times, and still maintained high separation performance. The self-cleaning CC@LDH/Ag membrane may hold great application prospects in oily wastewater remediation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Wei Jin,Hengbo Wu,Weiquan Cai,Baohua Jia,Munkhbayar Batmunkh,Zexing Wu,Tianyi Ma
Designing highly-efficient and pH-universal electrocatalysts for overall water-splitting reactions is important for the sustainable production of hydrogen. Herein, NiRu nanoparticles encapsulated into N-doped carbon (NiRu@NC) are fabricated with the assistance of MOF for hydrogen evolution reaction (HER) and also evolved into core–shell structured nanomaterials with abundant interfaces for oxygen evolution reaction (OER, Ni/RuOx@C). Benefiting from optimized electronic structure, interfacial synergy effect and special core–shell structure (~150 nm), the newly developed electrocatalysts present remarkable electrocatalytic activities with small overpotentials to drive 10 mA cm −2 for the HER (19 mV in alkaline, 80 mV in neutral, 20 mV in acid) and OER (252 mV, 316 mV, 211 mV). Moreover, the obtained electrocatalysts exhibit outstanding catalytic performances for overall water-splitting in a two-electrode system with 1.53 V and 1.67 V to drive 10 mA cm −2 in basic and neutral electrolyte, respectively. Remarkably, a small potential of 1.47 V is required to deliver 10 mA cm −2 in acidic media and no significant decay of the activity is observed. This work paves the way for designing a novel class of electrocatalyst that can not only exhibit remarkable electrocatalytic water splitting performances in various conditions, but also possess excellent stabilities for future generation of clean energy.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2021
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IF 7.033
Shasha Liu,Yuhui Wang,Juan Wang,Jianbin Zhou,Xun Hu,Hongqi Sun,Muhammad Asif Akhtar,Hong Zhang,Yong Huang,Shu Zhang
Char-supported metals as catalysts has attracted much attention due to the renewability and structural controllability of char. To understand the effect of char physicochemical structures on the activities of itself and it-supported metal, decomposition of a α−O−4 lignin model compound (benzyl phenyl ether, BPE) over various char-supported Ni catalysts was studied at 400 °C, in which the char supports were prepared at 400 °C, 600 °C, and 1000 °C, respectively. The results showed that the conversion of BPE over the original chars decreased from 17.63% to 7.79% when the preparation temperature of char increased from 400 °C to 1000 °C, while an opposite trend was found for the char-supported Ni, particularly full conversion of BPE was realized when char prepared at 1000 °C was used as the carrier. In addition to the catalysis of Ni, the introduction of Ni improved the graphitization degree and specific surface area of the char support, thus promoting the breakage of C α −O in BPE to mainly generate phenol and toluene. The synergistic effect of char support and Ni on BPE decomposition was demonstrated.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Guohao Chen,Lin Gao,Lulu Zhang,Xuelin Yang
Transition metal phosphates (TMPs) are considered as promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity (up to 1000 mAh g −1 ) and low cost. However, the poor electrochemical reaction kinetics and large volume expansion of TMPs are not conducive to practical applications in SIBs. In view of this, a kind of self-supported iron nickel phosphide (Fe-Ni-P) composite nanosheet arrays are obtained by reasonable hydrothermal reaction and phosphidation process. The nanosheet arrays construction can significantly release the mechanical strain and promote electrochemical reaction kinetics. Furthermore, the volume expansion can be largely alleviated by the synergistic effect of Fe 2 P and Ni 2 P. Benefiting from the unique design, the robust Fe-Ni-P arrays manifest remarkable Na + storage capability. The Fe-Ni-P nanosheet arrays exhibit a large discharge capacity of 300.9 mAh g −1 after 100 cycles at 0.1 A g −1 . And there is a reversible capacity of 201.7 mAh g −1 can be maintained without obvious capacity loss after 200 cycles at 0.5 A g −1 in SIBs.
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ENERGY
·
2020
·
IF 6.082
Shuping Zhang,Haoxin Yin,Jiaxing Wang,Shuguang Zhu,Yuanquan Xiong
The major obstacles for catalytic cracking of biomass tar have been known as the low tar removal efficiency and catalyst deactivation . In view of this, the novel Ni nanoparticles embedded carbon nanofiber/porous carbon catalysts were synthesized by the method of hydrothermal treatment combined with carbothermal reduction . The properties of catalysts were evaluated by characterization of N 2 adsorption-desorption, SEM , XRD , TEM, H 2 -TPRand Raman, meanwhile the evolutionary mechanism of catalysts was also proposed. The tar catalytic cracking tests indicated that the Ni 0.30 @CF/PCs exhibited the favorable catalytic activity with the high tar conversion efficiency (94.78%) as well as the better catalytic stability at the catalytic cracking temperature of 700 °C compared to other catalysts. In the case of Ni 0.30 @CF/PCs, the carbon nanofiber/porous carbon composites with hierarchical micro-mesoporous structure and high graphitization degree as well as the Ni nanoparticles embedded in catalyst support with the strong metal-support interaction exhibited the favorable activity-structure relationship. In addition, the Ni 0.30 @CF/PCs catalyst also presented the high tar conversion efficiency of 93.31% after 10 cycles, which was due to the high resistance towards coke deposition and sintering of metallic Ni covered by graphite layer from the carbothermal reduction process.
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CHEMOSPHERE
·
2020
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IF 5.778
Rajendran Ramachandran,Thangavel Sakthivel,Minzhang Li,Haiquan Shan,Zong-Xiang Xu,Fei Wang
Nickel-based metal-organic framework (Ni-MOF) was employed as a sacrificial template for the preparation of nickel-cobalt layered double hydroxide (NiCo-LDH) under different hydrolysis time. The template etching rate varied at different hydrolysis time, resulting in variations of the structural and morphology of NiCo-LDHs. The NiCo-LDH/10 sample showed a large specific surface area and the well-oriented larger dimension of thinner sheets due to the sufficient in-situ etching of the Ni-MOF template. The NiCo-LDH/10 was an excellent heterogeneous catalyst to activate peroxymonosulfate (PMS) for highly efficient Reactive Red-120 dye degradation. The results exhibited that the degradation efficiency of the NiCo-LDH/10-PMS catalyst was 89% for RR-120 dye within 10 min in the presence of the PMS system, which is higher than other NiCo-LDHs. Moreover, the other influencing factors such as PMS concentration, catalyst dosage, initial pH were also investigated towards degradation. The radical quenching measurement proved that the sulfate (SO 4 •− ) and hydroxyl (OH • ) had been indicated as the primary radicals. Besides, the NiCo-LDH/10-PMS catalyst showed excellent reusability even after five consecutive cycles (83.6% of the degradation efficiency). This work offer insight study on the construction of controlled morphology NiCo-LDH heterogeneous structure for high-efficiency PMS activation .
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Jiaming Wang,Huixian Zhong,Kang An,Qiang Liu,Wu Jin,Yuan Liu
In this work, Ni–Co alloy nanoparticles (NPs) on La-doped SiO2 showed excellent selectivity toward ethanol for direct ethanol synthesis via CO hydrogenation. Over the catalyst with an optimal ratio of Ni/Co, the total alcohol selectivity reached 33.5%, of which ethanol occupied 47.0 wt %. The results demonstrated that the interaction between Co and Ni improved the ability to activate H2 and CO and adjusted the amount of the dissociatively and associatively adsorbed CO. Besides, the mutual dilution of nickel and cobalt in Ni–Co alloy NPs effectively reduced the isolated Co or Ni-clusters; thus, the formation of heavy hydrocarbons was suppressed. In the reaction process, Ni@Co–Co2C, a core–shell composite with a nickel core and Co–Co2C shell, was formed, which suppressed the loss of nickel species. Moreover, with the reaction going on, a small amount of poorly alloyed Co-clusters would be covered gradually by the formed coke, resulting in an increase in alcohol selectivity.
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高影响因子
ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Jiatuo Yu,Xiaomin Zhang,Minggang Zhao,Yu Ding,Zhengming Li,Ye Ma,Hui Li,Hongzhi Cui
Copper ions (Cu 2+ ) pollution in the water environment poses a great threat to the health function of life-sustaining metabolic activities. However, the current detection methods need relatively expensive instruments, complex operation procedures and long time, so a facile and direct detection method is desired to be developed. In this work, the Ni-based composite wires with p-n junction (the Ni/NiO/ZnO/Chitosan wire) and Schottky junction (the Ni/NiO/Au/Chitosan wire) were fabricated, and the barrier driven electrochemical sensing mechanism was studied. The direct and facile detection of Cu 2+ was achieved with a wide linear range (0–6000 nM) and a low LOD (0.81 nM). The excellent stability and recovery in real water samples made the Ni-based composite wires a promising candidate for the practical application. The interfacial barriers of semiconductor can be used as a special sensing factor to develop novel sensors.
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PubMed
高影响因子
RENEWABLE ENERGY
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2021
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IF 8.001
Feng Lin,Yulong Ma,Yonggang Sun,Kanghe Zhao,Tingting Gao,Yingbo Zhu
Due to the inertness and structural complexity of lignin, upgrading lignin to biofuels and fine chemicals still faces great challenges. In this paper, a one-pot method was used to catalyze straw lignin with H-ZSM-5 supported by Ni and Ru bimetals, and the lignin conversion rate reached 88.1%. The yield of monophenol was 19.5%, of which the yield of 4-ethylphenol and 4-ethylguaiacol was 4.9% and 3.8%, respectively. The 2D HSQC NMR analysis confirmed that the Ni–Ru/H-ZSM-5 catalyst had an obvious activity of breaking C β -O bonds before and after the reaction. The result showed that after loading metal Ni and Ru, the Lewis acid of the catalytic system was greatly increased, which caused electron transfer between Ni and Ru. 3Ni-1.5Ru/H-ZSM-5 had the strongest activity due to the largest synergy among Ni, Ru and H-ZSM-5. The synergy was the key factor leading to the cleavage of C–C and C–O bonds in straw lignin and the high-performance catalytic degradation of lignin. Besides, the effect of reaction solvent and hydrogen resource on upgrading lignin to fine chemicals over 3Ni-1.5Ru/HZSM-5 catalyst was also intensively investigated. This research developed a method for the direct conversion of lignin into valuable monophenols.
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Nature Catalysis
·
2020
·Vol. 3
·期 4
·411-417
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IF 30.471
Zhang Xiaoben,Han Shaobo,Zhu Beien,Zhang Guanghui,Li Xiaoyan,Gao Yi,Wu Zhaoxuan,Yang Bing,Liu Yuefeng,Baaziz Walid,Ersen Ovidiu,Gu Meng,Miller Jeffrey T.,Liu Wei
The high catalytic performance of core–shell nanoparticles is usually attributed to their distinct geometric and electronic structures. Here we reveal a dynamic mechanism that overturns this conventional understanding by a direct environmental transmission electron microscopy visualization coupled with multiple state-of-the-art in situ techniques, which include synchrotron X-ray absorption spectroscopy, infrared spectroscopy and theoretical simulations. A Ni–Au catalytic system, which exhibits a highly selective CO production in CO 2 hydrogenation, features an intact ultrathin Au shell over the Ni core before and after the reaction. However, the catalytic performance could not be attributed to the Au shell surface, but rather to the formation of a transient reconstructed alloy surface, promoted by CO adsorption during the reaction. The discovery of such a reversible transformation urges us to reconsider the reaction mechanism beyond the stationary model, and may have important implications not only for core–shell nanoparticles, but also for other well-defined nanocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
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IF 4.65
Bin Wang,Laifei Xiong,Hanjing Hao,Hairui Cai,Pengfei Gao,Fuzhu Liu,Xiaojing Yu,Chao Wu,Shengchun Yang
In this work, we prepared the PtNi alloy nanoparticles on Al 2 O 3 (Al 2 O 3 –PtNi) via a simple wet-grinding method followed by a thermal reduction process. The as-prepared Al 2 O 3 –PtNi displayed a higher TOF of 426.84 mol H2 (mol Pt ·min) −1 toward the dehydrogenation of AB (ammonia borane) than Al 2 O 3 –Pt and Al 2 O 3 –Ni. Based on the theoretical calculations, an “electric-dipole” effect generated by the neighboring Pt–Ni atoms was found to facilitate the catalytic dehydrogenation process of ammonia borane (AB). The external electric field produced by the Pt–Ni dipole can elongate the B–H bond and increase the negative charges of H atoms on the BH 3 group, which helps to activate the B–H bond in the AB molecule, and thus enhances the kinetic process of catalysis.
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CATALYSIS TODAY
·
2020
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IF 5.825
Yang Yong,Gu Huajun,Zhang Qingxiao,Zhang Fang,Li Hui
In this paper, hollow Ni − P nanospheres (NSs) are prepared through Ni electroless plating on the Au-activated silica NSs externally covered by aminopropyl moieties, followed by removing the silica template with sodium hydroxide. With various characterizations, the resulting hollow Ni − P NSs are identified to be amorphous alloy. During liquid-phase hydrogenation of sugars to sugar alcohols, the hollow Ni − P amorphous alloy NSs delivered much superior catalytic performances to the commercial Raney Ni catalyst, showing a good potential in practical applications. Of particular interest is the unique hollow chamber structure of the hollow Ni − P amorphous alloy NSs, which allows for improving catalytic activity and durability relative to those associated with the dense Ni − P amorphous alloy NSs. This work demonstrated that such hollow Ni materials with nanoporous chamber structure displayed advantages such as easy experimental handling and high accessibility for the reactants in liquid-phase reaction, more Ni active sites, as well as the existence of more electron-enriched inner surface, which is essential to provide highly efficient catalysts for some reactions.
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