INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Mingxuan Fu,Qi Zhang,Yuena Sun,Guyang Ning,Xinyu Fan,Haiyang Wang,Haijun Lu,Yufan Zhang,Huan Wang
Electrochemical water-splitting is widely regarded as one of the essential strategies to produce hydrogen energy, while Metal-organic frameworks (MOFs) materials are used to prepare electrochemical catalysts because of its controllable morphology and low cost. Herein, a series of trimetallic porous Pt-inlaid Ni–Fe nanocubes (NCs) are developed with bifunctions of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In the process of prepare the electrochemical catalysts, Pt nanoparticles are uniformly embedded in the Fe–Ni PBA cube structure, and ascorbic acid is employed as a reducing agent to reduce Pt 2+ to Pt nanoparticles. In this work, the cubic structure of Fe–Ni PBA is maintained and the noble metal Pt nanoparticles are embedded. Remarkably, the formation of PBA cubes, Pt inlay and reduction are completed in one step, and Pt nanoparticles are embedded by a simple method for the first time. By employing acid etching method, a porous structure is formed on the PBA cube, which increases the exposed area of the catalyst and provides more active sites for HER and OER. Due to the porous structure, highly electrochemical active surface area and the embedded of highly dispersed Pt nanoparticles, the porous 0.6 Ni–Fe–Pt nanocubes (NCs) exhibits excellently electrocatalytic performance and durable stability to HER and OER. In this work, for HER and OER, the Tafel slopes are 81 and 65 mV dec −1 , the overpotential η at the current density of 10 mA cm −2 are 463 and 333 mV, and the onset potential are 0.444 and 1.548 V, respectively. And after a 12-h i-t test and 1000 cycles of cyclic voltammetry (CV), it maintained high stability and durability. This work opens up a new preparation method for noble metal embedded MOF materials and provided a new idea for the preparation of carbon nanocomposites based on MOF.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 5
·1407-1416
·
IF 3.186
Hong Liang,Yang Jing,Li Yongzheng,Gao Xin,Song Wuling,Zhang Hongxi
Lignocellulosic biofuels are the most promising sustainable fuels for supplementing shrinking fossil resources. In this work, acid-modified vermiculite (AVM)-supported Pd–Ni bimetallic catalyst (Pd–Ni/AVM) was investigated for the hydrodeoxygenation of bio-oil and its model compounds to assess its reactivity. Pd–Ni/AVM was found to efficiently hydrodeoxygenate the investigated model compound (phenol). The phenol conversion reached 94% at 0.5% of Ni loading and temperatures beyond 513 K. Using these parameters, the phenolic hydroxyl group was removed, and the C = C bonds were saturated. This catalyst was also efficient in the hydrodeoxygenation of bio-oil. H 2 -TPR experiments elucidated the synergistic effects between the active component and the carrier, which were considered the main reason for the catalytic activity. Strong influences of the Ni loading and temperature on the hydrogenation of phenol were also observed when the Pd loading was fixed at 1 wt%. Graphic Abstract
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SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Shuhan Dong,Yang Yang,Tingting Liang,Ruina Ma,An Du,Mingxu Yang,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Superhydrophobic coating technology is a promising anticorrosion method for metals. In this paper, a simple composite electrodeposition technique is proposed, in which micron-sized B 4 C particles are added to the electrolyte to construct Ni-B 4 C composite coating which exhibits a unique micro-nano structure. The addition of B 4 C particles promotes the construction of rough structure and enhances the corrosion resistance of the coating. When the B 4 C content is 3 g/L, the contact angle of the coating modified using a low surface energy material, reaches 162.5 ± 2°. The coating exhibits an excellent barrier effect against the corrosive medium. The superhydrophobic coating (M B-3 ) displays excellent corrosion resistance, and the corrosion protection efficiency reaches 99.53% in 3.5 wt% NaCl solution. The corrosion current density of M B-3 is 7.95 × 10 −8 A/cm 2 , which is three orders of magnitude lower than that of the pure Ni coating (M B-0 ). The addition of B 4 C promotes the growth of the coating, resulting in excellent shielding and stability.
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RARE METALS
·
2021
·Vol. 41
·期 1
·96-105
·
IF 4.003
Zhao Jin-Jin,Su Xiao,Mi Zhou,Zhang Ying,Hu Yan-Jun,Guo Hua-Jun,Jiao Yi-Nan,Zhang Yu-Xia,Shi Yan,Hao Wei-Zhong,Wu Jing-Wei,Wang Yi,Gao Cun-Fa,Cao Guo-Zhong
Organic–inorganic hybrid perovskite solar cells, one of the most promising photovoltaic devices, have made great progress in their efficiency and preparation technology. In this study, uniform, highly conductive Li n NiO x (0 ≤ n ≤ 1; 0< x ≤ 3) films were prepared by electrochemical deposition for a range of Li concentration. Photovoltaic performance for the perovskite solar cells was enhanced through incorporation of the ion pair of Ni 3+ ↔ Ni 2+ as the interfacial passivation. Depending on the amount of lithium doping, controlled interfacial oxidation was induced by Ni 3+ . The Li 0.32 NiO x inhibited charge recombination, reduced the defect density, and enhanced the photocurrent density. A maximum power conversion efficiency of 20.44% was obtained by Li 0.32 NiO x . Further, in the long-term, in-air stabilities of unencapsulated Li n NiO x perovskite solar cells were demonstrated. Graphic abstract
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CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14472-14477
·
IF 5.236
Hongjing Wang,Shiqian Jiao,Songliang Liu,Hugang Zhang,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Graphical The mesoporous PdNi/Ni nanoparticles assembled nanotubes (mPdNi/Ni NTs) have been synthesized via replacement reaction, in which nickel nanowires serve as sacrificial template to form tubular structure and the diblock copolymer induce the formation of mesoporous structures. Due to the mesoporous nanoparticle structure and tubular geometry, the mPdNi/Ni NTs have better catalytic performance than mesoporous Pd nanotubes and commercial Pd black for ethanol oxidation reaction. The optimization of structure and composition is essential to improve the performance of catalysts. Herein, mesoporous nanoparticles assembled PdNi/Ni nanotubes (mPdNi/Ni NTs) are successfully fabricated using nickel nanowires as sacrificial template. The combination of nanotubular structure with mesoporous nanoparticle morphology can provide facilitated transfer channels and sufficient active sites, allowing the full contact and reaction between catalysts and reactants. Therefore, the synthesized mPdNi/Ni NTs exhibite superior ethanol oxidation performance to mesoporous Pd nanotubes and commercial Pd black. This study proposes a rational strategy for the development of nanoparticle assembled nanotubes with surface mesoporous morphology, which can greatly improve catalytic performance in various electrocatalytic fields.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 53
·33416-33424
·
IF 3.361
Qiuyun Zhang,Qizhi Luo,Yaping Wu,Rongfei Yu,Jingsong Cheng,Yutao Zhang
This work reports the one-pot solvothermal synthesis of a Keggin heteropolyacid (phosphomolybdic acid, tungstophosphoric acid, or silicotungstic acid) immobilized on Ni-MOF composite catalysts for esterification of fatty acids, and the composites were further analyzed by XRD, FTIR, NH3-TPD, SEM, TEM, N2 adsorption/desorption, and XPS. Among the contrastive syntheses (i.e., HPW/Ni-MOF, HSiW/Ni-MOF, and HPMo/Ni-MOF), HPMo/Ni-MOF exhibits the most active catalyst toward fatty acids esterification, and the characterization results also revealed that HPMo/Ni-MOF has a strong acidity, large specific surface area, and appropriate average pore size. More significantly, this catalyst exhibits a good catalytic performance (86.1% conversion) during esterification under the optimized reaction conditions, and the HPMo/Ni-MOF catalyst can remain stable after the tenth cycle with a conversion of 73.5%. Intriguingly, the esterification reaction kinetics was studied, and the activation energy was found to be 64.6 kJ mol−1. The results indicated that the esterification of fatty acids using the HPMo/Ni-MOF catalyst is a chemically controlled reaction.
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高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-13
·
IF 4.011
Yuan Xiaoyu,Yin Chunyue,Zhang Yuanyuan,Chen Zengyue,Xu Yifan,Wang Jun
In this paper, a double hollow spherical shell composite modified with layered double hydroxide (C@Ni-Al LDH HSS) was fabricated for uranium(VI) (U(VI)) adsorption. Various batch experiments were carried out to investigate the influence of pH, concentration, time and coexistence ion on extraction. The results showed that the adsorption processes of U(VI) onto C@Ni-Al LDH HSS were spontaneous and endothermic and closely followed pseudo-second-order and Langmuir isotherm models. The equilibrium time and maximum adsorption capacity of C@Ni-Al LDH HSS was 360 min and 545.9 mg g −1 . FT-IR and XPS analyses proved that the adsorption behavior was primarily attributed to the strong interaction between oxygen-containing functional groups and U(VI). Moreover, the extraction of trace U(VI) (μg L −1 ) in artificial and natural seawater was also studied. The results showed that C@Ni-Al LDH HSS provided a promising application for the efficient extraction of U(VI) from seawater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Fuqin Zheng,Ziwei Zhang,Dong Xiang,Ping Li,Cheng Du,Zhihua Zhuang,Xiaokun Li,Wei Chen
Electrochemical water-splitting is an ideal strategy to produce the promising substitutable energy source, hydrogen (H 2 ). However, the sluggish kinetics of electrochemical oxygen evolution reaction (OER) and the prohibitive cost, low reserves and easy oxidation of noble metal-based electrocatalysts force researchers to explore efficient and low-cost electrocatalysts . Bimetal nanostructred materials are proved to have enhanced OER catalytic performances. In this study, a series of bimetallic metal-organic frameworks (Fe/Ni-MOFs) are prepared by a solvothermal method . The prepared MOFs present abundant unsaturated metal active sites for OER. The optimized Fe/Ni bimetal-MOF has low overpotentials of 236 mV at 10 mA cm −2 and 284 mV at 100 mA cm −2 for OER. In addition, in comparison with most of the previously reported OER electrocatalysts, the present MOF shows a lower Tafel slope of 49 mV dec −1 . Besides, the MOF catalyst exhibits high electrochemical stability and the OER activity shows a negligible change after stability test for 15 h and 10,000 voltammetric cycles. Meanwhile, the Fe-doped Ni-MOFs show faster catalytic kinetics and higher conductivity than the monometallic Ni-MOF. This work paves a way to exploit bi- or multi-metallic MOFs with high conductivities and electrocatalytic performances for electrochemical energy conversion .
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ChemSusChem
·
2019
·Vol. 12
·期 17
·3977-3987
·
IF 7.804
Qiying Liu,Haiyong Wang,Haosheng Xin,Chenguang Wang,Long Yan,Yingxiong Wang,Qi Zhang,Xinghua Zhang,Ying Xu,George W. Huber,Longlong Ma
Graphical Cellulose conversion into ethanol : Ethanol is obtained through one-pot cellulose hydrogenolysis over graphene-layers-encapsulated nickel catalysts with the aid of H 3 PO 4 in water. This work, for the first time, demonstrates a chemocatalytic approach for a high-yield production of ethanol from biomass using a non-noble metal catalyst. Ethanol is an important bulk chemical with diverse applications. Biomass-derived ethanol is traditionally produced by fermentation. Direct cellulose conversion to ethanol by chemocatalysis is particularly promising but remains a great challenge. Herein, a one-pot hydrogenolysis of cellulose into ethanol was developed by using graphene-layers-encapsulated nickel (Ni@C) catalysts with the aid of H 3 PO 4 in water. The cellulose was hydrolyzed into glucose, which was activated by forming cyclic di-ester bonds between the OH groups of H 3 PO 4 and glucose, promoting ethanol formation under the synergistic hydrogenation of Ni@C. A 69.1 % yield of ethanol (carbon mole basis) was obtained, which is comparable to the theoretical value achieved by glucose fermentation. An ethanol concentration of up to 8.9 wt % was obtained at an increased cellulose concentration. This work demonstrates a chemocatalytic approach for the high-yield production of ethanol from renewable cellulosic biomass at high concentration.
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CATALYSIS SURVEYS FROM ASIA
·
2018
·Vol. 22
·期 3
·129-135
·
IF 3.081
Zhang Di,Zhao Yun-Peng,Fan Xing,Liu Zhong-Qiu,Wang Rui-Yu,Wei Xian-Yong
A series of Ni/HZSM-5 catalysts with different Ni-loadings and Si/Al ratios were prepared by incipient wetness impregnation and employed for catalytic hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL). Their physicochemical properties were characterized by X-ray diffraction, nitrogen adsorption–desorption, X-ray photoelectron spectrometer, temperature-programmed desorption of ammonia,transmission electron microscopy, temperature-programmed reduction of hydrogen, and pyridine-adsorbed infrared spectroscopy. The diffraction peaks assigned to Ni phase were not observed, implying that nickel particles were small and had a high dispersion on the supports. The catalysts with a strong acidity and the appropriate ratio of Brönsted (B) acid sites to Lewis (L) acid sites (B/L = 4.9) show an excellent activity and selectivity for the hydrogenation of LA to GVL. High conversion of LA and selectivity towards GVL were achieved over 5 wt% Ni/HZSM-5-50. The maximum GVL yield of 100% over 5 wt% Ni/HZSM-5-50 was obtained under the optimized reaction conditions of 210 °C, 2 h, and 3 MPa initial hydrogen pressure.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Baosong Li,Xiao Li,Yuxing Huan,Wenzhe Xia,Weiwei Zhang
Influences of alumina nanoparticles on the microstructure and properties of Ni-B nanocomposite coating prepared by electro-co-deposition were studied. The effects of Al 2 O 3 nanoparticles, current density and electrodeposition time on microstructure, corrosion resistance , hardness and surface electronic state of Ni-B nanocomposite coating were revealed by SEM, EDX , XRD , XPS and electrochemical methods. The results demonstrate that the inclusion of Al 2 O 3 nanoparticles in Ni-B coating could improve the hardness and wear resistance accompanied with the grain refinement of the composite matrix . The incorporation of Al 2 O 3 nanoparticles alters the crystal orientation and then the microstructure of the Ni-B matrix. This enhances the corrosion resistance of Ni-B/Al 2 O 3 which is attributed to the compact structure and the reduction in the active surface area. XPS spectra indicate that the coating contains Ni, B, Al, N, O, and C. Under the influence of the grain refinement, hardening of the nanoparticles and the reduction in the active surface area, Ni-B/Al 2 O 3 composite coating exhibits excellent corrosion resistance and hardness.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Zimo Lou,Jiasheng Zhou,Mei Sun,Jiang Xu,Kunlun Yang,Dan Lv,Yaping Zhao,Xinhua Xu
A Pd/MnO 2 /Ni foam electrode with hierarchical structure was synthesized via electrodeposition for efficient electrocatalytic hydrodechlorination. Compared with the ordinary Pd/Ni foam electrode, the introduction of MnO 2 greatly enhanced the catalytic reactivity and reduced the dose of precious metal Pd. Only a quarter of Pd was required for the Pd/MnO 2 /Ni foam compared to the Pd/Ni electrode to achieve complete dechlorination of 2,4-dichlorobenzoic acid (2,4-DCBA) within 120 min. Various characterizations suggested that MnO 2 covered the surface of the Ni foam and increased the specific surface area of the electrode, while Pd nanoparticles were subsequently deposited on MnO 2 . The atomic H ∗ -based indirect dechlorination was the dominant pathway while only approximately 13% of 2,4-DCBA was removed by direct electron transfer. Atomic H ∗ adsorbed on Pd acted as the key active species for the dechlorination of 2,4-DCBA by the Pd/MnO 2 /Ni foam electrode in this study. The introduction of MnO 2 would promote the water dissociation and the hydrogen evolution reaction, and provide Pd with more atomic H ∗ . Pd/MnO 2 /Ni foam exhibited good stability and reusability according to the XPS spectra and consecutive electrocatalytic experiments, which suggested its long-term potential for efficient removal of chlorinated contaminants. This work demonstrated a new strategy to design efficient electrocatalysts with less precious metal.
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