FUEL
·
2021
·
IF 6.609
Xincheng Cao,Feng Long,Qiaolong Zhai,Jiaping Zhao,Junming Xu,Jianchun Jiang
To develop an efficient Ni-based catalyst for converting renewable fatty acids into high value-added fatty alcohols under mild reaction conditions, the scope of metal oxide modified nickel catalysts was scrutinized. The results show that MoO x modified Ni/CeO 2 catalyst exhibits the excellent catalytic performance in the conversion of fatty acids to form corresponding alcohols at mild reaction conditions (235 °C, 3.0 MPa H 2 ). Using stearic acid as a model substrate, Ni-MoO x /CeO 2 catalyst shows the 98.0% conversion and 96.2% selectivity to stearyl alcohol, which is significantly higher than that of Ni/CeO 2 catalyst and of a physical mixture of both Ni/CeO 2 and MoO x /CeO 2 . Detailed characterization (XRD, Raman, XPS, in situ CO-FTIR, HRTEM, and EPR) indicates that NiMoO 4 is the mainly active phase in the pre-reduced bimetallic catalysts. After reduction at 500 °C in a H 2 flow, the surface of Ni metal is decorated by the MoO x species, the phenomenon is similar to the strong metal-support interaction (SMSI) previously observed on reducible oxides. The presence of MoO x species in the bimetallic Ni-MoO x /CeO 2 catalyst not only improves the dispersion of metallic Ni, but also promotes the charge transfer from Ni to Mo. The electronic interaction at the interface of Ni and MoO x provides synergistic catalysis sites of electron-deficient Ni and MoO x species, which is primarily responsible for the excellent catalytic performance of the bimetallic Ni-MoO x catalyst. Additionally, the introduction of Mo species provides much oxygen vacancy sites for the adsorption of fatty acids, which results in high activity for the conversion of fatty acids. The insights into the synergistic catalysis between Ni and MoO x will provide new possibilities in the design of efficient Ni-based catalysts for selective hydrogenation of other biomass-derived compounds containing carboxylic group.
研究领域:
催化化学
·
可再生资源转化
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Bo Yu,Guohua Jiang,Wangcong Xu,Cong Cao,Yongkun Liu,Na Lei,Uwamahoro Evariste,Pianpian Ma
The NiMoO 4 /CoMoO 4 nanorod arrays wrapped by Ni-Co-S nanosheets were successfully grown on the surface of carbon cloth (NCMOS@CC) by combining of hydrothermal and electrochemical deposition methods. And the as-prepared NCMOS@CC showed good flexibility. The obtained NCMOS@CC as electrode materials were tested in a three-electrode system, showing a pretty good specific capacitance of 778.1 F g −1 at a current density of 0.5 A g −1 and excellent rate capability using 1 M KOH as the electrolyte. The flexible asymmetric supercapacitors (FASCs) were further fabricated using NCMOS@CC as the positive electrode and activated carbon@carbon cloth (AC@CC) as the negative electrode. The fabricated FASCs exhibited a safe working range with a potential window of 0–1.6 V with a maximum energy density of 33.1 Wh Kg −1 at 0.25 A g −1 and maximum power density of 3195 W kg −1 at 4 A g −1 . The fabricated FASCs even bent at different angles still showed good flexibility and stable electrochemical properties . These performances enable the NCMOS@CC to be one of the potential flexible electrodes for using in flexible energy storage devices.
研究领域:
材料科学
·
能源存储技术
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yan Sang,Xi Cao,Lvxuan Wang,Gaofei Ding,Yingjie Wang,Deshuang Yu,Yanan Hao,Linlin Li,Shengjie Peng
Synthesis of highly efficient, non-noble and bi-functional electrocatalysts is exceedingly challenging and necessary for water splitting devices. In this work, three-dimensional spherical Ni(OH) 2 /NiCo 2 O 4 heterojunctions are prepared by a one-step hydrothermal method and the hybrids are explored as efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte via tuning different Ni/Co atomic ratios of heterojunctions . The optimized Ni(OH) 2 /NiCo 2 O 4 (S (1:1)) exhibits high electrocatalytic activity with an ultralow over-potential of 189 mV at 10 mA cm −2 for the HER. With regard to the OER, the over-potential of the as-synthesized S (1:1) heterojunction is only 224 mV at the current density of 10 mA cm −2 . The improved catalytic performance of the Ni(OH) 2 /NiCo 2 O 4 heterojunctions is attributed to the chemical synergic combining of Ni(OH) 2 and NiCo 2 O 4 , large specific surface area for exposing more accessible active sites, and heterointerface for activating the intermediates that facilitates electron/electrolyte transport. The prepared catalyst exhibits good durability and stability in HER and OER catalyzing conditions. This study provides a feasible approach for the building of highly efficient bifunctional water splitting electrocatalysts and stimulates the development of renewable energy conversion and storage devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Heng Zhang,Yi Lu,Chang-Dong Gu,Jian-Bin Cai,Xiu-Li Wang,Jiang-Ping Tu
Amorphous Ni–P–C films are fabricated by combining the electrodeposition of Ni–P films from a eutectic-based ionic liquid and the direct current magnetron sputtering of amorphous carbon top-layer. The carbon top-layer with a thickness of about 10 nm is homogeneously coated on the surface of the Ni–P films. A comparison study is undertaken between Ni–P and Ni–P–C films to evaluate the microstructure and the electrochemical performances of the composite films as anode materials for lithium ion batteries , which allow the decoupling of the effect of the carbon layer . It is found that at lower discharge–charge current densities, the cyclability of both Ni–P and Ni–P–C films is similar. As the discharge–charge current density increases, the Ni–P–C film exhibits improved capability and reversibility over the Ni–P film. The Ni–P–C film delivers an initial discharge capacity of 1060 mAh g −1 at 250 mA g −1 and the capacity retention after 50 cycles is 62%, much higher than that of the Ni–P film (51%). The cyclability of Ni–P–C film at different discharge–charge current densities from 200 to 500 mA g −1 is also much better than those of Ni–P film. This study indicates that the introduction of a carbon top-layer on Ni–P film could significantly improve the electrochemical performances due to the decreased interface electric resistance and the structure stability.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
薄膜技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 3
·1584-1589
·
IF 3.288
Kui Liu,Yafei Cheng,Ying Shi,Wei Zhang,Yu Wang,Fan Tang,Xijie Lin
La–Ni bimetallic oxides, including LaNiO3 and La2NiO4, were prepared by a facile co-precipitation process, followed by calcination treatment. The formation process of these two La–Ni bimetallic oxides was traced by X-ray diffraction, and the calcination temperature was determined to have a crucial influence on the composition and crystalline structure of the final sample. These as-prepared La–Ni bimetallic oxides were used as catalysts for the decomposition of hydrogen peroxide. Benefiting from the synergistic effect between La and Ni, these La–Ni bimetallic oxides showed superior catalytic ability than the single-components oxides such as La2O3, Ni2O3, and NiO. Additionally, the La–Ni bimetallic oxides exhibited efficient catalytic activity after reusing them several times, showing a desirable cyclic performance. Moreover, the kinetics of the reaction was investigated. The activation energy of this reaction significantly decreased under the catalysis from the as-prepared La–Ni bimetallic oxides, further confirming the promising catalytic potential of these La–Ni bimetallic oxides.
研究领域:
材料科学
·
催化
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 10
·1505-1513
·
IF 4.803
Abuduwayiti Reyila,Ma Feng-Yun,Fan Xing
Four supported catalysts, nickel and ruthenium on a HZSM-5 support, were prepared by equal volume impregnation and in-situ decomposition of carbonyl nickel. The properties of catalysts were investigated by catalytic hydro-conversion of 2,2′-dinaphthyl ether as the model compound and extraction residue of Naomaohu lignite as the sample under an initial H 2 pressure of 5 MPa and temperature at 150 °C. According to the catalytic hydro-conversion results of the model compound, Ni—Ru/HZSM-5 exhibited the best catalytic performance. It not only activated H 2 into H⋯H, but also further heterolytically split H⋯H into immobile H − attached on the acidic centers of Ni—Ru/HZSM-5 and relatively mobile H + . Catalytic hydro-conversion of the extraction residue from Naomaohu lignite was further examined over the optimized catalyst, Ni—Ru/HZSM-5. Detailed molecular compositions of products from the extraction residue with and without hydrogenation were characterized by Fourier transform infrared spectroscopy and gas chromatography/mass spectrometry. The analytical results showed that the oxygen-containing functional groups in products of hydrogenated extraction residue were obviously reduced after the catalytic treatment. The relative content of oxygenates in the product with catalytic treatment was 18.57% lower than that in the product without catalytic treatment.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Xingpeng Gao,Yingying Hu,Wenping Zha,Yanpei Li,Jingyi Wang,Hongjian Lai,Xiangwei Wu,Jianhua Yang,Chunhua Chen,Zhaoyin Wen
Na-metal halide batteries are regarded as one of the most promising candidates for large-scale energy storage systems owing to their high energy density and high safety. However, the problems of low kinetics and poor stability caused by the low-conductive chlorides have restricted the development of Na-metal halide batteries. Here, we design a facile approach that combines electrospinning and electrodeposition to prepare electrodes with a nanostructured composite containing carbon nanofibers and Ni-Fe alloy (CNF@Ni-Fe alloy). It is confirmed that the Ni-Fe alloy can stably be oxidized and reformed when discharges from 2.36 V to 2.32 V. Benefiting from the unique nanoscale arrangement of Ni-Fe, the heterogeneous distribution of FeCl 2 and NiCl 2 effectively overcomes the block of low-conductive chlorides. Furthermore, the coreaction of Ni 2+ and Fe 2+ directly decreases the polarization potential, resulting in the improvement of reaction kinetics. Notably, batteries with the CNF@Ni-Fe alloy display a high specific capacity of 199.7 mAh g −1 and a capacity retention rate of 99% after 50 cycles at 0.6 C. The CNF@Ni-Fe alloy cathodes also deliver long-term stability with 104.5 mAh g −1 capacity retention after 600 cycles at 2 C and a good rate capability of 5 C.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jie Zhang,Chuang Li,Weixiang Guan,Xiaozhen Chen,Xiao Chen,Chi-Wing Tsang,Changhai Liang
Co(Ni)/MoO 3 catalysts were prepared, characterized and evaluated for the hydrogenolysis of bio-derived dibenzofuran (DBF), aiming at the understanding of the promoting effect of Co/Ni on MoO 3 for high-yield production of aromatic products. All Co(Ni)/MoO 3 catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. The experimental results from varying Mo species by adjusting the reduction temperature of MoO 3 together with XPS and in-situ XRD characteristic were evident that Mo 5+ species was responsible as the major active specie for the reaction. Promotional effect between Co(Ni) and Mo in Co(Ni)/MoO 3 catalysts was observed, resulted from the presence of acidic Co(Ni)MoO 4 species and a large number of Mo 5+ species both of which were created local to the Co(Ni)-O-Mo interface, as can be characterized by in-situ XRD, XPS, H 2 -TPR, NH 3 -TPD, in-situ FT-IR, Raman and TEM. The trend of the initial reaction rate follows: MoO 3 (0.18 μmol∙g cat −1 ∙s −1 ) < Ni/MoO 3 (0.26 μmol∙g cat −1 ∙s −1 ) < Co/MoO 3 (0.29 μmol∙g cat −1 ∙s −1 ), corresponding to the decreasing activation barrier. And the best catalytic activity was observed for the 100% yield of BP over Co/MoO 3 . A possible mechanism, including Co(Ni) facilitated reduction of Mo 6+ to Mo 5+ and Co(Ni) enhanced formation of acidic sites, is proposed to be responsible for the high activity in Co(Ni)/MoO 3 catalysts.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Sain Bux Jamali,Tauqeer Haidar Qamar,Sibt ul Hassan,Lei Ma,Pengkun Xia,Xuejun Zhang,M. Mateen,Shengxiang Huang,Lianwen Deng
Nitrogen-doped porous carbon nanocomposites are highly sought-after materials for electromagnetic wave absorption due to their unique combination of electrical and magnetic properties. However, achieving optimal absorption performance within the critical C-band (4–8 GHz) frequency range remains a significant challenge. Ni@NPC nanocomposites, synthesized through the polymer bubbling technique, demonstrated exceptional microwave absorption (MWA) performance in the C-band. These materials exhibited a reflection loss (RL) of −65.20 dB at a thickness of 4.8 mm. When carbonized at 600 °C, a thickness of 2.0 mm achieved an effective absorption bandwidth (EAB) of 5.74 GHz. The remarkable absorption performance is ascribed to the combined effect of their porous composition and the addition of nitrogen dopants, which efficiently foster various microwave attenuation processes. Furthermore, the material’s effectiveness in real-world applications was evaluated using computer simulation technology (CST). This work highlights the potential of the one-pot fabrication method for developing high-performance MWA materials with practical applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 37
·21175-21185
·
IF 3.049
Liuyi Pan,Yulong He,Menglong Niu,Yong Dan,Wenhong Li
Ni–M/SiO2 with different binary metals M (M = Ce, Co, Sn, Fe) prepared by an incipient impregnation method was used in the hydrodeoxygenation (HDO) of low-temperature coal tar distillate, which is rich in phenolic compounds. p-Cresol, as a model compound of the distillate, was used to evaluate the activity and selectivity of BTX products on the series of reduced Ni–M/SiO2 catalysts in a fixed bed reactor. The properties of the catalysts were characterized by N2 adsorption–desorption, ICP-AES, XRD, H2-TPR, and XPS. Benzene and toluene as the direct deoxygenation (DDO) products and cyclohexane and methylcyclohexane as the hydrogenolysis (HYD) products were detected to evaluate the selectivity of the path in the deoxygenation process. In this series of catalysts, the order of reactivity was Ni–Ce > Ni–Sn > Ni–Co > Ni–Fe > monometallic Ni. Meanwhile, the addition of Ce and Co loaded in the Lewis acid sites of the catalyst affected the electron distribution of nickel atom and its atomic arrangement on the surface of the carrier. Compared to monometallic Ni, the DDO path become dominant on Ni–Ce and Ni–Co and the selectivity for BTX products increased from 58.8% to 77.4% and 71.1%, respectively. The binary metal Sn, unlike the former two metals, formed a Ni3Sn crystal form with Ni, which resulted in significant enhancement of the HYD path while obviously increasing the reactivity.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Dengrong Sun,Fangxiang Sun,Xiaoyu Deng,Zhaohui Li
Different amounts of Co-substituted Ni-MOF-74 have been prepared via a post-synthetic metal exchange. Inductively coupled plasma mass spectrometry, powder X-ray diffraction (XRD), N2 adsorption/desorption, and extended X-ray absorption fine structure (EXAFS) analyses indicated the successful metathesis between Co and Ni in Ni-MOF-74 to form the solid-solution-like mixed-metal Co/Ni-MOF-74. It was found that introduction of active Co into the Ni-MOF-74 framework enabled the inert Ni-MOF-74 to show activity for cyclohexene oxidation. Since Co was favorably substituted at positions more accessible to the substrate, the mixed-metal Co/Ni-MOF-74 showed superior catalytic performance, compared with pure Co-MOF-74 containing a similar amount of Co. This study provides a facile method to develop solid-solution-like MOFs for heterogeneous catalysis and highlights the great potential of this mixed-metal strategy in the development of MOFs with specific endowed functionalities.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yu Cheng,Haoran Guo,Pengfei Yuan,Xinpan Li,Lirong Zheng,Rui Song
To satisfy the practical requirements of electrochemical water splitting, developing a flexible, effective and sustainable approach for scalable production of bifunctional electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is a tremendous issue to be rationally addressed. Herein, a solid-state diffusion strategy with Ni foam and N-doped carbon layers is applied to prepare multi-interfacial, self-supported and N-doped carbon nanotube (NCNT) encapsulated Ni nanoparticles (NPs) array bifunctional electrocatalyst (NCNT-NP@NF). Prominently, this NCNT-NP@NF is scalable to meet the application requirements and can be used as a binder-free electrode for direct the water splitting. The optimal sample demonstrate outstanding HER/OER performance in 1.0 M KOH, with low overpotential ( η 10 ) at 10 mA cm −2 during HER (96.1 mV) and OER (240 mV) process, which is extremely superior to the most reported metal-based electrocatalysts and even better than commercial IrO 2 (400 mV at 10 mA cm −2 for OER). Strikingly, when these bifunctional electrocatalysts are employed in a dual-electrode electrolyzer for water splitting, the NCNT-NP@NF only needs cell voltage of 1.54 V to drive overall water splitting in 1.0 M KOH, and displays excellent long-term stability (150 h for water splitting). Moreover, experiments combined with density functional theory (DFT) calculations clarify that the remarkable electrochemical activity and stability are mainly attribute to the synergistic effect of the uniform distribution of Ni NPs, heteroatomic doping, as well as district confinement effect of NCNT leading to enhanced electronic multi-interfacial transmission, all these factors co-accelerate electrocatalytic kinetics. Accordingly, this solid-state diffusion method possesses a favorable potential to construct a multi-interfacial and self-supported electrocatalysts in the fields of sustainable supply of clean energies.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
·
可持续能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）