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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Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 21
·3179-3192
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IF 8.683
Bo Dai,Feng Dong,Jia Yu,Shixuan Feng,Haowen Wang,Tingxi Li,Mingliang Ma,Jianxu Ding,Yong Ma
Electromagnetic radiation has been a special form of environmental pollution that has attracted widespread attention in the past few decades. Combining the advantages of one-dimensional (1D) materials forming conductive networks and two-dimensional (2D) materials possessing multiple reflections is an excellent research method for the development of electromagnetic wave (EW) absorbing materials. Herein, Ni@polypyrrole nanochains/Ti3C2Tx (Ni@PPy NCs/Ti3C2Tx, NiPM) ternary composites have been successfully prepared through the combined utilization of the solvothermal method, hydrothermal method and vacuum-assisted filtration. The ternary composites consisting of 1D core-shell Ni@PPy NCs (NiP) and 2D Ti3C2Tx can effectively combine conductive loss, dielectric loss and magnetic loss, resulting in excellent impedance matching. The minimum reflection loss (RLmin) of the prepared ternary composites can be up to −62.61 dB at 6.82 GHz with a thickness of 2.71 mm while the effective absorption bandwidth (EAB) is 4.46 GHz at 1.38 mm. This work provides a general guideline for the development of a MXene and conducting polymer matrix design for EW absorbing materials.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yushan Yang,Shaoyu Yuan,Heli Pan,Zixuan Li,Zejiang Li,Sufang Sun,Yongjun Gao
A novel explosion-assistant strategy was developed to fabricate graphene oxide supported nickel and palladium three-component catalyst Pd/Ni/NiO/GO for hydrogenation of nitriles to secondary amines. The explosion during the synthesis of catalyst was essential to the well-dispersion of palladium and the decomposition of metal salt precursors. Palladium component was well anchored on nickel oxide and graphene oxide sheets, which regulated the catalytic performance of palladium. This special structure facilitated the spillover of active hydrogen species generated on palladium component to nickel (oxide) and graphene oxide sheets, enhancing the catalytic activity of the bimetallic catalyst. This work developed an effective strategy to fabricate multi-component metal catalyst with low-cost transition metal as main composition for selective hydrogenation of nitriles to secondary amines.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Jiao Yang,Lishan Peng,Na Yang,Lianqiao Tan,Fangzheng Wang,Xinran Shen,Qingfei Liu,Zidong Wei
The promotional effects of inert nitrides for metal catalysts in the electrolysis are rarely reported. Recently, we reported an efficient Ni-VN/NF (that NF represents Ni foam) composite by nitriding treatment of NiV-layered double hydroxides (NiV-LDH) precursor that was in-situ hydrothermal growth on nickel foam. The optimal Ni-VN/NF exhibited outstanding electrocatalytic performance for hydrogen evolution reaction (HER) with a small overpotential of 39 mV at 10 mA cm −2 and strong durability for 100 h without degradation. The optimized electronic structure and local charge density at the hetero-interface of Ni-VN, evidenced by both experiment and DFT results, were significantly modulated by the electron transfer from Ni to V-N bond at the interfaces, leading to moderate H* adsorption energy and diminished barrier for H 2 O dissociation, synergistically promoted basic HER. This work highlights the design principle of strong metal-nitride interactions for advanced HER catalysts.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Junmei Liang,Qicheng Zhang,Haibo Zhao,Shaolei Zhao,Yulong Wu,Xiaobin Fan
Hydrodeoxygenation (HDO) of fatty acids to alkanes is key to convert renewable resources into biofuels. Here, we design a new Ti3C2Tx MXene-confined Ni catalyst with extraordinary catalytic performance in the HDO of palmitic acid. Due to the large two-dimensional surface and chemical activity, Ti3C2Tx MXene is able to disperse and anchor Ni particles through strong synergistic coupling. As a consequence, the obtained Ni/Ti3C2Tx catalyst exhibits excellent catalytic performance with a complete conversion of palmitic acid. It can be recycled in five runs without activity reduction, demonstrating good stability of the as-prepared catalyst. The facilitated catalytic performance can be ascribed to the synergic effect of metal Ni and Ti3C2Tx MXene. Ti3C2Tx MXene facilitates the adsorption and conversion of palmitic acid to aldehyde. The dispersed Ni particles benefit from the hydrogenation of hexadecanal intermediate with the cleavage of C–C bonds and the dehydration–hydrogenation of hexadecanol to form alkanes.
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CATALYSIS COMMUNICATIONS
·
2022
·
IF 3.51
Bin Chen,Jian Qiu,Liang Xu,Yan Cui
The Ni/Ce 0.8 Zr 0.2 O 2 catalysts with different Ni doping amounts (5 wt%, 10 wt%, 15 wt%, 20 wt%, and 25 wt%) are prepared by the impregnation technique and used as CO 2 methanation catalysts in this work. The effects of various Ni doping loading on CO 2 methanation catalytic performance at low temperatures were investigated in this catalytic system. The results show that the catalyst with 15 wt% Ni doping shows the best catalytic performance. Since the heated sintering of Ni nanoparticles was prevented efficiently by CO 2 methanation, these mesoporous catalysts exhibit excellent stability. Therefore, the catalyst is expected to be an efficient CO 2 methanation catalyst at low temperatures.
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ACS Omega
·
2022
·
IF 4.132
Ratul Rehman,Xiaolin Zhang,Miao Chang,Daomin Qin,Yi Liu,Peng Wei,Chao Huang,Bin Wang,Fangyu Xiong,Yue Xu,Pei Hu,Jiantao Han,Paul K. Chu
A one-step coprecipitation process is designed to synthesize zinc hexacyanoferrate (ZnHCF) cathodes in aqueous zinc-ion batteries (ZIBs). The morphology of the cathode is influenced by the concentration of the precursor solution and valence of iron ions. The rhombohedral ZnHCF sample exhibits high crystallinity on the microscale in the cut-angle cubic structure, whereas Na-rich NaZnHCF contains many interstitial water molecules in the rhombic nanoplates. Both samples show effective insertion of Zn ions in the aqueous ZnSO4 solution. ZnHCF shows a specific capacity of 66.7 mA h g–1, a redox voltage of 1.73 V, and fast decline in a few cycles. On the other hand, NaZnHCF has a lower specific capacity of 48.2 mA h g–1, showing two voltage platforms and robust cycling stability. However, owing to serious side reactions, both samples have low Columbic efficiency. To improve the properties such as Coulombic efficiency, specific capacity, and cycling stability, Ni ions are introduced by adding 10 wt % NiSO4 to the ZnSO4 electrolyte. The ZnHCF cathode in the Ni-containing electrolyte has the best properties such as a high specific capacity of 71.2 mA h g–1 at a current density of 100 mA g–1, 93% retention of the Coulombic efficiency, and a good rate performance manifested by a reversible capacity of 58.2 mA h g–1 at 1 A g–1. The results reveal a strategy to improve the electrochemical properties of aqueous ZIBs by modifying the electrolytes.
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Ting-Sheng Chen,Liang Guo,Hua-Wei Peng,Yong-Qi Li,Xing-Bao Wang,Hong-Cun Bai,Zhen-Yi Du,Wen-Ying Li
Controlling the oxygen-free product selectivity in catalytic hydrodeoxygenation is essential for producing high-quality fuel from coal- and biomass-derived liquids. In this paper, the selectivity of oxygen-free products and efficiency of hydrodeoxygenation of dibenzofuran as a model compound of coal- and biomass-derived liquids have been controlled by varying the Si content in the prepared catalysts (Ni/ x Si-OMA, where x = SiO 2 /(SiO 2 + Al 2 O 3 ) and OMA = ordered mesoporous alumina). In comparison, the hydrodeoxygenation of dibenzofuran was performed using Ni/SBA-15, which displayed the lowest selectivity of oxygen-free products at 36.4%. On the other hand, doping Si in OMA introduces the Brønsted acid sites, which desirably enhances the selectivity of oxygen-free products. Above 99% selectivity of oxygen-free products has been attained for Ni/30Si-OMA and Ni/40Si-OMA catalysts. The Lewis acid sites of the OMA promote the deoxygenation efficiency through the enhanced adsorption of oxygen-containing intermediates. Besides, the Brønsted acid sites generated in OMA as the result of Si-doping promote the ring-opening and dehydration reactions of the oxygen-containing intermediates, which further lead to an overall enhanced hydrodeoxygenation performance for dibenzofuran.
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RSC Advances
·
2021
·Vol. 11
·期 53
·33416-33424
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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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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3168-3182
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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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GREEN CHEMISTRY
·
2021
·Vol. 24
·期 3
·1335-1341
·
IF 10.182
Wenyan Zhang,Hangmin Guan,Yingfei Hu,Wei Wang,Linyun Hao,Xiaoli Yang,Wenjie Tian
With the dramatic increase in the application of modern office equipment, such as laser printers and photocopiers, large amounts of waste toner powder are used and discarded, ending up in landfills around the world. As waste toner powder contains hazardous compounds that can seriously endanger both the environment and human health, it is urgent to deal with waste toner powder and convert it into high value-added products. In this work, we report, for the first time, visible-light-driven hydrogen production with waste toner activated by cheap Ni species (waste toner@Ni-species) as the photocatalyst. The Ni species adhered to the waste toner through in situ photoreduction, without sophisticated equipment. It is found that the Ni species were composed of metallic Ni and oxidized Ni, which worked in synergy to remarkably enhance the photocatalytic activity of the waste toner. Activated by the Ni species, the hydrogen evolution rate of the waste toner was accelerated by up to 62 times, and the apparent quantum efficiencies (AQEs) of the waste toner were boosted by up to 64 times. In addition, the waste toner@Ni-species exhibited a higher charge separation efficiency, faster interfacial charge transfer rate and ∼200 mV lower barrier for proton reduction than those of the pristine waste toner. In addition to these merits, the waste toner@Ni-species could be separated conveniently from the aqueous system using magnetic attraction, as the saturation magnetization and residual magnetism of the waste toner were improved with the assembly of the Ni species. The approach shown here indicates a simple and promising way to deal with waste toner by converting it to a cost-effective photocatalyst for producing clean energy.
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危险品化学品经营许可证（带存储）