INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Xiaohui Yang,Chengjun Tang,Lihong Hu,Yonghong Zhou,Minghao Zhou
The industrial production of monophenols was mainly dependent on fossil resources, due to growing energy demand and escalating environmental issues, more efficient and sustainable strategy, such as utilization of biomass as raw materials to economically produce monophenols, was desired, which could liberate us from the reliance on fossil resource and was of great industrial and social significance. Herein, a novel strategy was reported to produce biomass-derived monophenols from lignin by directly deconstructing C-O bond under mild conditions. A series of NiM-MOFs (M=Co, Mo, and Cu) derived bimetallic catalysts were synthesized via a simple hydrothermal method, which were characterized by XRD , SEM , TEM , XPS and NH 3 -TPD. The synergistic effect between the Ni and Mo greatly improved the catalytic activity and inhibited the transformation to by-products. In addition, we explored a new binary solvents system of MeOH-THF to effectively enhance the selectivity of monophenols. Under optimal catalytic conditions, Ni4Mo1/C-BN catalyst could break the C-O bonds in lignin dimer under 160 ℃ to afford phenol and benzoic acid , and the possible reaction pathway was proposed. The high yield of lignin oil from the oxidation of various realistic lignin also confirmed the superiority of this catalytic system. The lignin depolymerization products were characterized by element analysis, GPC and GC-MS, confirming the presence of mainly guaiacyl-type (G) products, while the highest yield was assigned to vanillin.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 36
·16819-16827
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IF 3.3
Yue Feng,Yu Chen,Lan Yang,Ningna Chen,Ruiqing Liu,Xiujing Lin,Wencai Wang,Xiaomiao Feng
Transition metal nitrides (TMNs) are promising electrode materials for high-performance energy storage devices owing to their excellent conductivity, thermal stability, high theoretical capacity and excellent electrochemical activity. However, the structural instability present in the electrochemical reaction process significantly limits their widespread application. Herein, we present a V–Ni-based nitride heterojunction on carbon cloth (VN/Ni3N–Ni/CC) as an active electrode material for flexible supercapacitors. The VN/Ni3N–Ni/CC composite electrode was successfully fabricated through controllable nitridation of the corresponding vanadium–nickel oxide grown on carbon cloth (V–Ni–O/CC) precursors. The electrochemical results reveal that the areal capacitance of the VN/Ni3N–Ni/CC based supercapacitor with a nitriding temperature of 400 °C and a nitriding time of two hours can achieve a maximum areal capacitance of 845.63 mF cm−2 at a current density of 0.5 mA cm−2, and the electrode in the three-electrode system retains 86.1% of its initial capacitance value after 1500 cycles at a current density of 10 mA cm−2. In addition, the assembled flexible all-solid-state symmetric supercapacitor using the VN/Ni3N–Ni/CC electrode exhibits an areal capacitance ratio of 19.1 mF cm−2 at a current density of 0.4 mA cm−2 and excellent cycling stability. Moreover, it displays exceptional flexibility under different bending angles highlighting its potential for integration into flexible electronic devices.
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Nanoscale
·
2023
·Vol. 15
·期 37
·15238-15248
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IF 6.7
Nan Zhang,Gang Li,Zhichao Yu,Zhenguo Tang,Xiaoyan Liu,Congwei Wang,Kaiying Wang
Heterostructure interfacial engineering between photocatalyst and co-catalyst to obtain an optimized electronic structure is a promising approach to improving their performance in the photocatalytic hydrogen evolution reaction (HER). In this work, two-dimensional nanopetal-like ZnIn2S4 (ZIS) with an adequately exposed active (110) edge facet-decorated Ni cluster heterostructure was prepared via chemical bath deposition, followed by photodeposition. In the catalyst preparation, the ZIS microstructure was modulated to sufficiently expose the active sites of the (110) edge for the HER, on which spontaneous interfacial engineering with an additional Ni cluster co-catalyst would be triggered via photodeposition in situ. The hydrogen production rate of the composite photocatalyst was excellent, at up to 26.80 mmol g−1 h−1 under simulated sunlight, which was 15.4 times greater than that of pristine ZIS. The optimized photocatalyst achieved a state-of-the-art apparent quantum yield of 61.68% at a single wavelength of 420 nm. Combined with systematic experimental characterization and density functional theory calculation, it was demonstrated that the separation and migration of charge carriers were significantly enhanced via the Ni cluster-induced interfacial electron redistribution, which contributed to the near-zero Gibbs free energy barrier and favored intermediate (*H) adsorption and desorption behavior, resulting in the superior photocatalytic performance. In summary, this work enables tuning of the interfacial electronic properties via spontaneous photodeposition of metallic cluster co-catalyst on the edge active sites, through which the separation of photogenerated charge carriers and surface redox reactions can be synergistically facilitated.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Man Zhao,Rong Zhang,Zimei Fu,He Xiao,Meng Bai,Li Zhang,Junming Zhang,Jianfeng Jia,Nianjun Yang
Sluggish reaction kinetic and large overpotential of the oxygen evolution reaction (OER) result in low energy efficiencies of different OER related devices. To solve these challenges, an OER electrocatalyst is constructed by coupling black phosphorus with Co/Ni nanosheets during a facile electrolysis-solvothermal process, where the bulky BP is successfully exfoliated into BP sheets (BP NSs) and the Co or Ni precursors are generated via anodic oxidation . Then, BP sheets are combined with Co–Ni species and finally formed into Co–Ni/BP composite via subsequent solvothermal process. The OER tests on this composite show the overpotential is 292 mV at 10 mA cm −2 , much lower than that (341 mV) on a RuO 2 catalyst. The TOF value of this composite is 0.71 s −1 at 1.8 V ( vs . RHE), 14.2 times higher than that of Co/BP (0.05 s −1 ) and 23.7 times higher than Ni/BP (0.03 s −1 ). Operando structure characterizations of this composite reveal that Co 2+ -Ni 2+ dual-sites are formed on Co–Ni/BP and electrons are transferred from Ni to Co via a P bridge. These Co 2+ -Ni 2+ dual-sites evolve into Co 3+ -Ni 3+ dual-sites during the OER, where Ni 2 P is formed into NiOOH and CoP turns into Co 3 O 4 . The Ni-P x -Co bridge is finally transformed into a heterogeneous Co 3 O 4 /NiOOH structure. This heterostructure efficiently regulates electronic structure of Co and Ni sites, resulting in the favorable adsorption of OH*, conversion of rate-determining step, reduced activation energy of the whole reaction, and eventually enhanced intrinsic activity toward the OER. This work provides a guidance to explore operando reconstruction mechanism of black phosphorus based electrocatalysts during electrocatalytic reactions .
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Journal of Cleaner Production
·
2023
·
IF 11.1
Hongtao Li,Haitao Yang,Jiaxin Cheng,Qingshan Zhu
Electroless plating is the main method for preparing metal-coated composite powders , such as Ni-coated graphite powders with wide applications in electromagnetic shielding materials, sealing coating, and electrocatalysis. However, the issues of uniform and dense coating during synthesis are hindering its practical implementation. Incorporating noble metals, such as Pd, to activate powders is a typical technique to prepare an electroless Ni coating. However, noble metal utilization is hindered by issues such as high costs and substantial wastewater. Herein, a novel low-cost and eco-friendly activation method based on fluidized bed hydrogen reduction is designed to prepare densely coated Ni@irregular graphite particles (Ni@IGP) using a low Ni content. This method can be used to construct a uniform and dense Ni coating for composite powders without acid alkali treatment and use of precious metals during the overall manufacturing process . Results demonstrated that the Ni@IGP particle obtained through this approach have good electrical conductivity and ferromagnetic properties. In addition, the uniformity and integrity of the Ni plating were adjusted, and the dense coating of graphite at a low Ni content of 35 wt% was effectively achieved. This new activation method sheds light on the field of electroless Ni plating on powders.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Han Sun,Fang Xu,Yongmei Hu,Sui-Jun Liu,Haiping Huang
A series of Pt/Ni-MOF nanocomposites with different atom molar ratio of Pt/Ni were synthesized by the traditional hydrothermal method. Various methods including element mapping, X-ray diffraction (XRD) were employed to characterize the crystal structure and surface morphology of the materials. TEM (Transmission Electron Microscopy) confirms that the Pt nanoparticles are highly dispersed onto the Ni-MOF nanosheet surface, which can provide an abundance of active sites for efficient oxidation of methanol. Electrochemical measurements showed that Catalyst b (the atomic molar ratio of Pt to Ni is 2:1 in the precursor materials) exhibited a higher oxidation current density in MOR and larger electrochemically active surface area (ECSA) than other catalysts with different atomic ratios and commercial Pt/C. Meanwhile, the synthesized catalysts showed long-term activity and good resistance to toxicity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zhi Wang,Zhaokun Wang,Jiashuai Wang,Haofeng Shi,Chengdeng Wang,Yila Fan,Zhiming Bai,Chuang Zhu,Xiaoqin Yan
Water electrolysis has been acknowledged as a renewable, scalable, and effective way of producing hydrogen . However, for water splitting, efficient and noble metal-free electrocatalysts were lacking. Here, a Co–Ni–Zn porous three-dimension N-doped carbonization structure on the carbon nanotube film (CNTF) was synthesized through a metal organic frameworks (MOFs) annealing procedure. The porous morphology, caused by the evaporation of zinc at high temperatures, enhances the interaction between the catalysts and electrolyte, and the self-supporting structure minimizes the contact resistance between the catalysts and the substrate, which reduces obstructions during current flow. More active sites, multiple mesopores, and high conductivity are all features of this composite structure. It can achieve a small overpotential of 112 mV and 270 mV at a current density of 10 mA cm −2 , respectively, for hydrogen and oxygen evolution reactions (HER and OER). At a current density of 10 mA cm −2 , the Co–Ni–Zn/NCNTF has an external voltage of 1.58 V and is very durable for overall water splitting.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-19
·
IF 2.8
Si Tiantian,Xie Shuai,Ji Zhijiang,Ma Chao,Wu Zihao,Wu Junyu,Wang Jing
The heterostructure composite has unique advantage in promoting electromagnetic wave (EMW) absorption due to special composition and structure. Herein, carbon black (CB)/Ni hybrids were successfully assembled on basalt fiber (BF) by electrostatic self-assembly and dip-coating processes. The EMW absorption performance is optimized by regulating the ratio of flower-like Ni and CB. Based on the synergistic effect of magnetic loss Ni and dielectric loss CB, the RL of the prepared BF-CB/Ni composite reaches up to − 35.29 dB at 16.97 GHz with thickness of 1.5 mm and efficient absorption bandwidth (EAB) reaches 5.38 GHz. Large heterogeneous contacts constructed by various components on the surface of BF strengthen the polarization loss and conductivity loss. This work provides an effective way to design absorbing materials with good environmental stability and corrosion resistance.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Xinyue Mao,Qingnan Meng,Mu Yuan,Sifan Wang,Shiyin Huang,Baochang Liu
The weak interfacial strength between Fe-based matrix and diamonds causes diamond particles to fall off prematurely, significantly affecting the cutting efficiency of diamond composites. This work aimed to optimize the interfacial microstructure and mechanical properties of the diamond/Fe-Ni-WC composites by coating a Mo 2 C layer on the diamond particles. The Mo 2 C-coated diamonds were prepared via the molten salt method. Diamond/Fe-Ni-WC composites were sintered by the hot-pressing process under a vacuum. The bending strength of composites with Mo 2 C-coated diamonds was improved from 804 to 996 MPa with the increased coating time. The energy dispersive spectroscopy scanning indicated that the Mo 2 C coating layer changed the interfacial composition between the matrix and the diamonds from Fe–C alloy to Mo 2 C, improving the interface strength. Moreover, the diamond protrusion heights of composites were raised by adding a Mo 2 C interface, resulting in an improvement in the cutting efficiency of impregnated diamond tools.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·11318-11324
·
IF 3.3
Jiazheng Zhu,Chengjie Duan,Sen Ye,Qizhong Zhang,Kun Li,Guangke He,Xiang Liu,Zhiguo Zhang
Exploring synthetic methods and catalysts that are easy to handle, highly active, and low-cost for producing industrially important chemicals is a long-term goal in both science and industry. Herein, we present a general and facile Ni-catalyzed reductive amination of aldehydes/ketones methodology using hydrazine as both nitrogen and hydrogen sources, instead of the traditionally used hydrogen gas and ammonia. The mesostructured alumina-supported Ni catalyst with a relatively high ratio of Ni0 and small-sized Ni nanoparticles plays a critical role in this transformation, resulting in 55 aldehydes/ketones successfully converting to their corresponding primary amines with 61–99% yields. This work outlines a low-cost yet robust catalytic methodology for the facile and general synthesis of primary amines for practical laboratory and industrial application.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Qirun Wang,Yanjie Duan,Zhixiong Huang,Xiaowei Xu,Jichao Shi,Lin Lin,Sheng Han,Runping Jia,Shufang Chang,Dandan Wu
Electrocatalysts with densely exposed sites and high intrinsic activity are desired for high-efficiency oxygen evolution reaction (OER). In this paper, we report the microwave assisted solvothermal growth of NiMoO 4 nanoflowers on electrodeposited Ni(OH) 2 nanosheets , forming a high specific surface area (132.5 m 2 g -1 ) nanoflower-like NiMoO 4 /Ni(OH) 2 configuration supported on a conductive nickel foam (NF) substrate. The as-prepared NiMoO 4 /Ni(OH) 2 /NF behaved efficiently as a self-supported 3D catalyst electrode for alkaline OER, compared with commercial RuO 2 (298 mV overpotential at 10 mA cm −2 and Tafel slope of 88.6 mV dec −1 ), needing a low overpotential of 292 mV to attain 10 mA cm −2 , with a small Tafel slope of 85.0 mV dec −1 and good stability for 100 h running at 10 mA cm −2 in 1.0 M KOH. Aside from enlarged surface area for more exposed edge sites for catalysis, the modulated synergy between Ni and Mo atoms probably contributes to enhanced intrinsic activity. A more electronegative Mo increases the electron density of Ni, thus accelerating the deprotonation of intermediates and driving the transition from Ni to NiOOH, leading to modulated thermodynamics and kinetics for OER catalysis.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2023
·Vol. 33
·期 9
·2721-2731
·
IF 4
Asif Sana Ullah,Ghori Ubaid-ur-Rehman,Ranjha Qasim Ali,Ahmed Fahim,Solre Gideon F. B.,Ahmad Ishfaq,Ibrahim Fatma A.,Hamdy Mohamed S.,Saleh Ebraheem Abdu Musad,Eldin Sayed M.
In this work, Ba 0.8 In 0.2 Fe 12−x Ni x O 19 (x = 0.00–2.00) hexaferrites were prepared by the ceramic route, and the effect of ferromagnetic dopant Ni was retrieved on the structure and magnetic properties. Microstructural properties were explored using XRD and SEM. The range of the grain size was between 500 to 2000 nm. In addition to these, micro strain, dislocation density, and porosity were determined. According to the VSM findings, ferromagnetic nickel doping increased the magnetic saturation up to 58.36 emu/g. The coercivity values were observed within a defined range from 5.129 kOe to 5.512 kOe, showing only a slight change. Moreover, the magnetocrystalline anisotropy constant, anisotropy field, and anisotropy parameter were calculated. The results showed that the magnetocrystalline anisotropy constant and anisotropy field both increased up to 0.06308 emu/g.kOe and 1.722 kOe for an increase in doping concentrations and then dropped for x = 2.0. The magnetic moment per formula unit in terms of Bohr magneton was also computed and has an upper limit of 11.603. These results suggest that the synthesized material is a good contender for magnetic applications.
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