ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Fan Liu,Yang Tang,Jiaming Zhao,Yu Bai,Jiucun Chen,Liangliang Tian,Syed Shoaib Ahmad Shah,Shu-juan Bao
The insufficient intrinsic activity and electrical conductivity of transition metal-based catalysts still inhibits their practical application. In this work, carbon-coated nano-Ni-armed Mo 2 N nanosheets (Ni@C-Mo 2 N) assembled on Ni Foam (NF) by using CDs-NH 2 as reaction inducing and welding reagent. In-depth experiments reveal that the functional groups of (CDs) play a decisive role in regulating the phase composition and hierarchical structure of the final hybrid material. As electrocatalysts for hydrogen evolution reaction (HER), the optimized hierarchical Ni@C-Mo 2 N/NF achieved a very low overpotential of 38 mV at 10 mA cm −2 and outstanding stability of over 60 h, which should from the synergistic interfacial effect among the Ni, Mo 2 N and graphitic carbon optimized the electronic structure of catalyst with enhanced active sites, and improved electrical conductivity. This work provides novel insights for constructing more hierarchical multicomponent materials with the help of variable functional groups of CDs for further electrochemical applications.
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LANGMUIR
·
2022
·
IF 4.331
Junjie Si,Shuai Zhang,Xiuming Liu,Kuanjun Fang
Reactive dyes are widely used in textile industry, but their excessive use has caused several water pollution problems. In order to reasonably treat printing and dyeing wastewater, the highly efficient adsorbent for reactive dyes employed in this study is a new type metal–organic framework (MOF) material. Ni/Co MOF (NCM) was synthesized using the solvothermal method; then, the materials were analyzed by a series of characterization methods. This study mainly investigated the adsorption properties of NCM toward reactive dyes, and the adsorption capacities of NCM toward reactive red 218 were up to 200 mg·g–1. The results were found to conform to the Langmuir isotherm model, and the pseudo-second-order kinetic model by performing kinetic and isotherm studies on the adsorption process of reactive red 218 on NCM. The results of the intraparticle diffusion model suggest that the binding of reactive red 218 to NCM was mainly divided into three steps: adsorption, diffusion, and saturation. Moreover, it was concluded by thermodynamic fitting of the adsorption process that the adsorption of reactive red 218 by NCM proceeded spontaneously and was accompanied by an endothermic reaction, in which the adsorption of both occurred mainly by electrostatic attraction. The NCM has good reusability and still has good adsorption performance after being reused 5 times. Therefore, NCM is a very promising and excellent adsorbent for the treatment of dye wastewater because of its high efficiency and reusability.
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高影响因子
JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Feng Lin,Yudan Zhong,Yulong Ma,Yonggang Sun,Xiuqin Men,Yingbo Zhu
Hydrodeoxygenation (HDO) of renewable lignin-derived biomass in aqueous-phase to produce high value-added products is of great significance. However, developing new catalysts with high activity and excellent stability in an aqueous phase faces considerable challenges. Rare earth doping can effectively regulate the water exchange rate constant (WERC) value of the catalyst and play an important role in promoting the hydrolysis of ether bonds. Therefore, in this paper the bimetallic supported catalyst Ni–La 2 O 3 /H-ZSM-5 doped with rare earth metal La 2 O 3 was prepared, and used to catalyze the conversion of the lignin model compound guaiacol to cyclohexanol in the aqueous phase. The conversion of guaiacol catalyzed by 10Ni–3La 2 O 3 /H-ZSM-5 reaches 100%, and the selectivity of the product cyclohexanol is 85%. A series of characterizations illustrate that the doping of La 2 O 3 causes the electron transfer between La 2 O 3 –Ni and changes the distribution of Ni, and a strong metal carrier interaction occurs between the bimetallic Ni–La 2 O 3 and H-ZSM-5. This can effectively promote the hydrolysis of the C–O ether bond in guaiacol and significantly improve the activity of the catalyst. The possible catalytic reaction mechanism of Ni–La 2 O 3 /H-ZSM-5 catalytic conversion of guaiacol was proposed.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qingyu Wang,Xiaorui Liu,Haozhi Wang,Yuanhao Shen,Zequan Zhao,Cheng Zhong,Wenbin Hu
Zn–Ni battery is prospective green energy storage device. However, Zn(OH) 4 2– , the dissolved product of ZnO in the electrolyte, redistributes during the cycle, leading to the shape changing of the anode. This issue severely limits the lifespan of zinc anodes. Despite the success in improving the electrochemical performances of zinc anode via adding Ti 4 O 7 additive, the important mechanism of such modified anode has not been well understood. In addition, the aluminothermic reduction is facile and energy-saving. But the application of Ti 4 O 7 synthesized by this method in Zn–Ni batteries has not been studied. Herein, Ti 4 O 7 synthesized by facile and rapid aluminothermic reduction was applied to alkaline zinc anode. In subsequent electrochemical tests, the discharge capacity and cyclic performance of the zinc-nickel battery was significantly improved by adding as-prepared Ti 4 O 7 particles. At a high discharge current of 2.5 A (34.54 mA cm −2 ), the anode modified by Ti 4 O 7 delivered higher discharge capacity of 364 mAh g −1 , in contrast to the 283 mAh g −1 of pristine anode. Even at ultra-high discharge current of 10 A (138.16 mA cm −2 ), the battery operated stably for 480 cycles. Besides, the mechanism of Ti 4 O 7 modifying anode was studied in-depth by a variety of characterizations and density functional theory (DFT) calculations. We discovered that Ti 4 O 7 simultaneously regulates the distribution of electrons on the anode and Zn(OH) 4 2– in the electrolyte, contributing to forming uniform zinc anode during cycling.
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Advanced Science
·
2022
·Vol. 9
·期 22
·2201594
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IF 17.521
Rui Yang,Xiaozhong Zheng,Minkai Qin,Binbin Lin,Xiaoyun Shi,Yong Wang
Recently, extensive research efforts have been devoted to drive electrocatalytic water-splitting for hydrogen generation by electricity or solar cells. However, electricity from power grid and the intermittent property of sunlight inevitably brings about environmental pollution and energy loss. Thus, a novelty energy system for simultaneous generating H 2 from solar energy and overcoming the intermittence of sunlight is highly desirable. Herein, a self-powered energy system with solar energy as the sole input energy is successfully assembled by integrated Zn–air batteries with stable output voltage, solar cells, and water splitting electrolyzer to efficient H 2 production. Specially, the Zn–air batteries are charged by the solar cell to store intermitted solar energy as electricity during light reaction. Under unassisted light reaction, the batteries could release electric energy to drive H 2 production. Therefore, the aim for simultaneous generating H 2 and eliminating the restrictions of intermittent sunlight are realized. The solar-to-hydrogen efficiency and solar-to-water splitting device efficiency of the self-powered energy system are up to 4.6% and 5.9%, respectively. This work provides the novel design systems for H 2 production and the usage of renewable energy.
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Molecular Catalysis
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2022
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IF 5.089
Guangbo Xia,Zhiwei Zhou,Juan Qin,Binbin He,Yangyang Liu,Peiyong Sun,Wenliang Wu
In this paper, a modified facile one-pot AcHE method was adopted to prepare the nickel nanoparticles embedded into the tungsten and niobium metal oxides with binuclear acidities. Their physical and chemical properties were characterized by XRD, liquid N 2 sorption, Py-IR, NH 3 -TPD, Raman, H 2 -TPR, XPS and SEM-EDX and TEM techniques, and their catalytic performances were investigated in the hydrogenolysis of glycerol. The characterization results showed that both nickel nanoparticles can be uniformly doped into the Ni-Nb x W 10-x samples with ordered mesoporous structures and strong interaction between tungsten and niobium species would be formed resulting in the promotion of acidity amount and intensity. The 10 Ni-Nb 3 W 7 sample by synergistic effect has higher catalytic performance in the hydrogenolysis of glycerol than other samples owing to the larger acidities with appropriate ratio of Brønsted to Lewis acidity, whose 1, 3-PDO yield of 28.3% and the molar ratio of 1, 3-PDO to 1, 2-PDO of 2.13 would be obtained. The correlations between the ratio of Brønsted to Lewis acidity and the molar ratio of 1, 3-PDO to 1, 2-PDO and Brønsted acidity and 1, 3-PDO yield can be concluded as y = 2.608x-1.502 (R 2 =0.9831) and y = 1.035x-31.579 (R 2 =0.9730), respectively. Compared to the 10 Ni/Nb 3 W 7 sample prepared by impregnation method, the 10 Ni-Nb 3 W 7 sample shows good stability with slight decrease, where the glycerol conversion of 63.2% and 1,3-PDO selectivity of 42.1% can be obtained even though after repeated use for 6 times. The catalytic performance of 10 Ni-Nb 3 W 7 sample was also higher than other previously reported nickel-based catalysts, which can further prove a valuable reference for the preparation of effective catalysts in the glycerol hydrogenolysis with high selective production for 1, 3-PDO.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Wei Guo,Huanhao Chen
Nonthermal plasma (NTP)-assisted CO2 methanation can activate and convert stable CO2 molecules under ambient conditions as compared to conventional thermal catalysis (normal operation temperature up to 450 °C), which is a good technique to reduce CO2 emissions and simultaneously utilize the renewable energies like solar and wind. It is critical to develop a robust catalyst with good catalytic performance in order to make NTP catalytic CO2 methanation more competitive. Herein, we present a simple yet efficient synthesis of CeO2-supported Ni catalysts with yttrium (Y) as the promoter (i.e., Ni–Y/CeO2) via mechanochemical synthesis for efficient NTP catalytic CO2 methanation. The developed 7.5Ni–1Y/CeO2 catalyst demonstrated the highest energy efficiency values for CO2 conversion and CH4 yield, i.e., ∼57 gCO2 kWh–1 and ∼17 gCH4 kWh–1, respectively. The CO2-TPD and HRTEM results confirmed that the doped Y positively enhanced the basicity of the catalysts and also decreased the particle size of Ni nanoparticles, thus promoting the NTP catalytic activity of CO2 methanation. The catalyst displayed excellent short-term stability for plasma catalytic CO2 methanation over a 12 h on-stream evaluation, showing a CO2 conversion of 84.2 ± 1.8% and a CH4 selectivity of 83.3 ± 1.9%.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Yang Xu,Yingying Zhu,Pengfei Shen,Geng Chen,Xinbao Li
An improved method for hydrogen production by the steam reforming of phenol over novel fly ash-based catalysts is investigated. The Ni/Al 2 O 3 -ash catalysts are prepared by an equal-volume impregnation method and characterized by XRD , FESEM , BET and H 2 -TPR techniques. The effects of various process parameters including mixing ratio of fly ash, temperature, support, gas hourly space velocity (GHSV) and steam-to-carbon molar ratio (S/C) on the catalytic activity are investigated. The results show that fly ash mixing at 50 wt% and choosing γ-Al 2 O 3 as the support own the best performance. A maximum hydrogen yield of 83.8% is achieved at 450 °C with a S/C of 10 and a GHSV of 4968 h −1 with a maximum phenol conversion of 98.6%. The stability of the Ni-ash1-γA1 catalyst is further investigated and it is shown to continuously and stably react for more than 20 h at 450 °C with excellent catalytic reaction stability.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Jia-Wei Wang,Ying-Xia Ma,Xiao-Ya Kang,Hai-Jun Yang,Bing-Lu Liu,Shu-Shu Li,Xiao-Dan Zhang,Fen Ran
Metal-organic framework (MOF) has great potential in the field of supercapacitors as electrode material due to its high specific surface area and unique structure. Herein, a series of nickel MOFs (Ni-MOFs) were fabricated by one-pot solvothermal method at different experimental conditions. The electrochemical properties of the Ni-MOFs as electrode materials can be tuned by adjusting the experimental conditions to regulate the structures. The result indicates that a novel moss-like three-dimensional (3D) Ni-MOF had the maximum specific capacity of 638 C g -1 at a current density of 0.5 A g -1 . The asymmetric supercapacitor (ASC) assembled by using moss-like 3D Ni-MOF as the positive electrode and active carbon as the negative electrode exhibited a high energy density of 30.4 Wh kg -1 at power density of 407.4 W kg -1 .
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3168-3182
·
IF 4.682
Tian Fuping,Zhang Mengjie,Zhang Xinchi,Chen Xiao,Wang Jinliang,Zhang Yifu,Meng Changgong,Liang Changhai
Hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL) or hydrocinnamaldehyde (HCAL) with high selectivity has important industrial value. Previous studies have shown that nickel-based catalysts are highly active and favor the selectivity to HCAL. However, Ni in metallic state is so active that most of nickel-based catalysts need to be pre-reduced before use. In this paper, a stable Ni–C catalyst was prepared by simple pyrolysis of Ni-BTC and systematically characterized. The results showed that metallic Ni nanoparticles were uniformly dispersed and encapsulated in the carbon layer, which protects the metallic Ni from oxidation. Therefore, the Ni–C catalyst can be directly used in CAL hydrogenation without pre-reduction. The catalyst Ni-C-600 achieved 92.5% selectivity to HCAL at 96.2% conversion of CAL at 120 °C under 2 MPa H 2 for 6 h with a poor reusability in isopropanol (IPA), while the catalytic performance and reusability were evidently enhanced (HCAL selectivity ~ 94%, CAL conversion ~ 99% in five consecutive runs for 4 h) in a solvent containing water and IPA. This study provides a facile and low-cost method to prepare effective Ni-based catalysts displaying excellent catalytic activity with high HCAL selectivity and stable reusability in CAL hydrogenation. Graphical abstract
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ACS Nano
·
2021
·
IF 15.881
Caiyue Wen,Xiao Li,Ruixuan Zhang,Chunyang Xu,Wenbin You,Zhengwang Liu,Biao Zhao,Renchao Che
Two-dimensional materials, especially the newly emerging MXene, have attracted numerous interests in the fields of energy conversion/storage and electromagnetic shielding/absorption. However, the inherently inevitable aggregation and absence of magnetic loss of MXene considerably limit its electromagnetic absorption application. The introduction of magnetic component and favorable structural engineering are the alternatives to improve the microwave absorption (MA) performance. Herein, we report a spheroidization strategy to assemble double-shell MXene@Ni microspheres, where the commonly lamellar MXene are reshaped into three-dimensional microspheres that provide the substrate for oriented growth of Ni nanospikes. Whereas this structural feature offers massive accessible active surfaces that effectively promote the dielectric loss ability, the introduction of magnetic Ni nanospikes enables the additional magnetic loss capacity. Benefiting from these merits, the synthesized 3D MXene@Ni microspheres exhibit superior MA performance with the minimum reflection loss value of −59.6 dB at an ultrathin thickness (∼1.5 mm) and effective absorption bandwidth of 4.48 GHz. Moreover, the electron holography results reveal that the high-density anisotropy magnetism plays an important role in the improvement of MA performance, which provides an insight for the design of MXene-based materials as high-efficient microwave absorbers.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Kang Ji,Junpeng Wang,Ping Yang
Modulation of oxygen intermediates in the oxygen evolution reaction (OER) tends to be an effective method for intensifying OER activity. In this paper, NiCo nanolayered double hydroxide (NC-LDH)-decorated FeNi bimetallic metal–organic framework (FN-MIL) heterostructures were constructed for enhanced OER performance. Various characteristics including Raman and Fourier-transform infrared spectra, X-ray diffraction patterns, scanning and transmission electron microscopy images, and X-ray photoelectron spectroscopy spectra help to explore the composition and microstructure. The band gap of samples was discussed using Mott–Schottky curves and Tauc plots to analyze the interfacial electron transfer driven by the energy level difference, resulting in the formation of electron-rich and electron-deficient regions at the interface and realizing the directed modulation of oxygen intermediates. The as-prepared composite catalyst revealed excellent OER performance, long-term stability, a high faradic efficiency of 97.8%, and a low potential of 244 mV at 10 mA cm–2 (without iR-compensation). Interestingly, the catalyst maintained high OER activity in seawater containing 1 M KOH due to its favorable resistance to chloride ions, suggesting an appealing prospect in practical application.
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