Inorganic Chemistry Frontiers
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2017
·Vol. 4
·期 11
·1791-1797
·
IF 4.036
Jiangli Meng,Jiaqi Fu,Xiaoxuan Yang,Meijie Wei,Song Liang,Hong-Ying Zang,Huaqiao Tan,Yonghui Wang,Yangguang Li
The development of stable, highly active and cheap electrocatalysts towards the oxygen evolution reaction (OER) has been an ongoing challenge due to practical problems such as slow kinetics and high overpotential. Herein, we utilized a one-pot hydrothermal method to prepare cobalt/nickel molybdate hierarchical microflowers on conductive carbon cloth (MMoO4-CC, M = Co, Ni) as three-dimensional self-supported electrodes for the oxygen evolution reaction. CoMoO4-CC showed better catalytic activity than NiMoO4-CC. Benefiting from the synergistic effect of a large active area, fast charge and mass transport as well as a three-dimensional conducting path, the CoMoO4-CC nanosheet electrode showed a large current density and a relatively low starting potential, delivering 10 mA cm−2 current densities at an overpotential of 290 mV and a Tafel slope of 94 mV dec−1. Furthermore, the CoMoO4-CC nanomaterial shows better electrocatalytic stability than IrO2-CCa, which could be a promising electrocatalyst for large-scale water oxidation.
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MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Juan Lu,Zhuo Sun,Xin Zhang,Xiangyu Shan,Qian Wu,Yingjie Zhao,Li Tian
A novel electrochemiluminescence (ECL) sensor for glucose detection was constructed by covering Au nanoparticles (Au NPs), Ni metal–organic frameworks nanofibers (Ni-MOF NFs) and glucose oxidase (GOD) on the electrode surface, respectively. Ni-MOF NFs prepared by electrostatic spinning can be used as GOD carrier and ECL promoter. Meanwhile, synergistic effect of Ni-MOF NFs and Au NPs could amplify the ECL signal of Ru(bpy) 3 2+ -TPrA system. With the increasing of glucose concentration, ECL signal was also increasing, so a method for determining glucose could be established. The possible mechanism of luminescence was investigated, and the parameters affecting the experimental reaction were also studied. Under the optimal conditions, the constructed ECL sensor can effectively detect glucose in the range of 2.0 × 10 −10 to 2.0 × 10 −5 M, and the detection limit was 6.7 × 10 −11 M. This study demonstrated for the first time that Ni-MOF NFs could serve as ECL accelerator for the facile detection of glucose in human serum.
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FUEL
·
2025
·
IF 7.5
Qichao Liang,Fei Lu,Farhat Shakeel,Xueying Wang,Yilin Sun,Jiefang Wang,Hai Huang,Jinrui Su,Bin Cai
The porous structure of anodes is crucial to the performance of intermediate-temperature solid state fuel cells (IT-SOFCs). With the rapid development of high performance cathodes, the role of anodes needs to be considered again. A hierarchical porous Ni-Ce 0.8 Sm 0.2 O 2-δ (SDC) anode consisted of ∼200 nm width, and ∼800 nm and ∼10 μm diameter pores can be formed by reducing NiO, and burning of polymethyl methacrylate (PMMA) and starch pore-formers with a total load of 20 wt%, respectively. For single cells with Ni-SDC|SDC|Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ configuration, the peak power density (PPD) (0.26–1.73 W·cm −2 ) at 723–923 K is achieved with the addition of 10 wt% starch + 10 wt% PMMA, which is 136–52 % and 86-14 % higher than that without pore-formers and with 20 wt% starch, respectively. More importantly, it has a similar long-term stability of the cell without pore-formers. The comprehensive results suggest that the apparent improvement in PPDs is primarily attributed to the increased length of effective three-phase boundaries due to the formation of a percolation network of anodes, while also highlighting the significant influence of anode/electrolyte interface polarization on the electrochemical performance of IT-SOFCs.
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ENERGY & FUELS
·
2022
·
IF 4.654
Xun Zhou,Shaojie Wu,Yongming Luo,Linhua Zhu,Dedong He
Propane dehydrogenation (PDH) is a very important and efficient propylene production process. Currently, it is a challenge to design a catalyst that can replace precious Pt and toxic Cr. Ni species are widely used in reactions for the activation of C–C and C–H bonds, but making Ni species active sites for alkane dehydrogenation is a challenge. In this paper, a series of catalysts with different Ni loadings were impregnated onto dealuminated β zeolite, and it was observed that low loadings of the metal could improve Ni dispersion and produce a high amount of Lewis acid sites, thus inhibiting the side reactions during the PDH process. The characterization results demonstrated that Ni species at low loadings were successfully introduced into vacancy defects over the dealuminated β zeolite. Moreover, good dispersion of Ni sites and excellent reactivity were obtained, with 42% initial propane conversion and a high propylene generation rate of 0.8 g–1·h–1, which was higher than those of many other metal catalysts. This study provides new ideas for the development of economical and environmentally friendly PDH catalysts.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Jianguang Yuan,Haixiang Huang,Zan Jiang,Yujie Lv,Bogu Liu,Bao Zhang,Youhua Yan,Ying Wu
Borohydride magnesium is widely studied as a promising hydrogen storage material due to its high gravimetric and volumetric density (14.9 wt % and 112 g/L, respectively). Different types of catalysts play a good catalytic role in enhancing the hydrogen desorption rates in borohydride systems. In the present paper, multiwalled carbon nanotubes supported Ni (Ni/MWCNTs) were synthesized by a chemical reduction method, and the catalyst was introduced into Mg(BH4)2 to enhance the dehydrogenation kinetics. The effect of Ni/MWCNTs on the microstructural evolution and hydrogen storage properties of Mg(BH4)2 is studied. The Mg(BH4)2-5wt% Ni/MWCNTs (95M@5NiMWCNTs) sample exhibits the best hydrogen storage performance; it starts to release hydrogen at 93 °C, which is 113 °C lower than that of the primary Mg(BH4)2 sample. Moreover, it takes only 3600 s to desorb hydrogen completely at 300 °C, showing a significant improvement on hydrogen desorption kinetics. In comparison with the primary Mg(BH4)2 sample, the dehydriding apparent activation energy of the 95M@5Ni3MWCNTs2 sample is significantly lowered to 119.5 kJ mol–1. Transmission electron microscopy analysis exhibits that the striking improvement of dehydriding properties of Mg(BH4)2 is mainly due to the synergistic catalysis of Ni and MWCNTs. This work provides a new method for designing and synthesizing high-performance catalysts in borohydride hydrogen storage materials, which is potentially utilized as a hydrogen supplier for hydrogen fuel cells.
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Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 4
·1150-1158
·
IF 0
Bin Hua,Meng Li,Bo Chi,Li Jian
Two types of anode were prepared for a comparative study of their electrochemical performance and carbon deposition resistance. The first one was the Ni–YSZ cermet anode; and the other, designated as the Ni–MnO/Ni–YSZ, was the Ni–YSZ anode plus an on-cell reforming layer of Ni–MnO in situ reduced from MnNi2O4 with a microstructure of fine Ni particles embedded in MnO matrix. With the Ni–MnO layer on the top surface, open circuit polarization resistance of the Ni–YSZ anode decreased approximately by 1/2 in H2-3 mol% H2O and by more than 1/3 in CH4-3 mol% H2O at temperatures ranging from 650 to 800 °C. Carbon fibers were observed in the Ni–YSZ anode, rather than in the Ni–MnO/Ni–YSZ anode, after initial impedance measurements in CH4-3 mol% H2O for 1 h. The polarization resistance of both anodes at 800 °C increased with time up to 6 h in CH4-3 mol% H2O due to carbon deposition; however, the carbon formed in the Ni–MnO/Ni–YSZ anode had a lower degree of graphitization. In the atmosphere of CH4-20 mol% H2O, carbon deposition was completely depressed in the Ni–MnO/Ni–YSZ anode at 800 °C and 200 mA cm−2, which ensured a higher and more stable electrochemical performance than that of the Ni–YSZ anode.
研究领域:
材料科学
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电化学
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能源工程
·
催化
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Chao Chen,Xiaohua Deng,Yingjie Deng,Lu An,Yijie Deng,Yuying Zheng,Dai Dang,Xu Yang
Developing high-efficiency bifunctional materials for electro-catalysis and supercapacitors are urgently needed but challenging. Herein, we develop a self-supporting Co–Ni LDH electrode prepared by in-situ growing ZIF-L(Co)@ZIF-L(Co, Ni) on carbon paper followed by a pseudomorphic transformation. The optimized Co–Ni LDH/carbon paper electrodes (CN-2/CP) exhibit excellent electrochemical activity and stability in oxygen evolution reactions (OER) and supercapacitors. The CN-2/CP electrode displays a low overpotential of 230 mV at 10 mA cm −2 and superior stability at 40-h chronopotentiometry for OER. For supercapacitor, the CN-2/CP electrode delivers a high specific capacitance of 1346 F g −1 at 1 A g −1 and maintains a capacitance of 88.5% after 7000 charge/discharge cycles at 20 A g −1 . Based on the physical and chemical characterization results, the high performance originates from the in-situ electrochemical conversion of metal hydroxide , improved conductivity, fast charge transfer at the interface and unique layered cross morphology providing more active sites.
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FUEL
·
2024
·
IF 6.7
Shenghua Liu,Xiaoqian Feng,JinXin Xu,Jiaxin Wang,Yonghua Zhao,Huan Wang,Qijian Zhang
CO 2 methanation is a potential way for the re-utilization of CO 2 . MOF derivations are promising candidates for commonly used Ni-based catalysts due to their high porosity and confinement effect. Herein, we systematically investigated the synthetic pathway of Zr-MOF-derived Ni-based catalysts. It is found that Ce addition can effectively improve the thermostability, specific surface area and Ni dispersion of the derived Ni/CeO 2 -ZrO 2 catalyst. It can also enhance the adsorption of CO 2 by the generation of O v and improve CO 2 methanation activity. Calcination the MOF in inert gas leads to the formation of CNTs and amorphous carbon. Amorphous carbon results in less interaction between NiO and CeO 2 as well as low amount of O v , leading to lower catalytic activity than the catalyst calcinated in air. Compared with impregnation method, one-pot solvothermal method leads to much higher specific surface area for both MOF and derived oxides. It also benefits the uniform dispersion of NiO and higher amount of O v . Therefore, it shows better catalytic activity and is proved to be a better method for Ni introduction. In the catalysts we discussed, St-ZrCeNi (Ce addition, one-pot solvothermal method, calcination in air) shows the highest CO 2 conversion and good CH 4 selectivity due to its high specific area and more O v . It also shows good stability (>50 h) and good intrinsic activity. This research reveals the roles of several important factors in the synthesis process of Zr-MOF derived Ni-based catalysts. It also gives new insights for the design and synthesis for other MOF derived catalysts.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yang Xu,Hao Guo,Yuxiang Mao,Lei Qian,Weijuan Yang,Jun Cheng
To enhance deoxygenation and cracking performance of microalgal biodiesel to produce a jet fuel-range hydrocarbon blend, an efficient Ni-carbon composite was prepared by pyrolyzing Ni-based metal–organic frameworks (Ni-1,3,5-benzenetricarboxylate, Ni-BTC) for catalytic conversion with a substantially reduced catalyst dosage. Coordinated Ni ions in the Ni-BTC precursor were converted into highly active Ni nanoparticles due to catalyst pyrolysis, while an increased specific surface area of the catalyst facilitated mass transfer in microalgal biodiesel conversion. X-ray absorption fine structure analysis confirmed the formation of Ni–Ni active sites, while density functional theory calculations revealed that the C═C bond was the initial site for the cracking reaction of long-chain fatty acids. The selectivity of jet-fuel-range products in methyl palmitate conversion over the Ni@C500 (Ni-BTC pyrolyzed at 500 °C) catalyst increased to 71.46% with a substantially reduced catalyst dosage (the mass ratio of catalyst to reactant was 1:200). The Ni@C500 catalyst exhibited excellent performance with high selectivity (71.6%) and conversion efficiency (97.46%) in deoxygenation and cracking of microalgal biodiesel for jet fuel-range hydrocarbon blend production.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·Vol. 46
·期 66
·33186-33196
·
IF 5.816
Xinjun Li,Yaokun Fu,Yichao Xie,Lian Cong,Han Yu,Lu Zhang,Yuan Li,Shumin Han
Additive doping is one of the effective methods to overcome the shortcomings of MgH 2 on the aspect of relatively high operating temperatures and slow desorption kinetics. In this paper, hollow g-C 3 N 4 (TCN) tubes with a diameter of 2 μm are synthesized through the hydrothermal and high-temperature pyrolysis methods, and then nickel is chemically reduced onto TCN to form Ni/TCN composite at 278 K. Ni/TCN is then introduced into the MgH 2 /Mg system by means of hydriding combustion and ball milling. The MgH 2 –Ni/TCN composite starts to release hydrogen at 535 K, which is 116 K lower than the as-milled MgH 2 (651 K). The MgH 2 –Ni/TCN composite absorbs 5.24 wt% H 2 within 3500 s at 423 K, and takes up 3.56 wt% H 2 within 3500 s, even at a temperature as low as 373 K. The apparent activation energy ( E a ) of the MgH 2 decreases from 161.1 to 82.6 kJ/mol by the addition of Ni/TCN. Moreover, the MgH 2 –Ni/TCN sample shows excellent cycle stability, with a dehydrogenation capacity retention rate of 98.0% after 10 cycles. The carbon material enhances sorption kinetics by dispersing and stabilizating MgH 2 . Otherwise, the phase transformation between Mg 2 NiH 4 and Mg 2 NiH 0.3 accelerates the re/dehydrogenation reaction of the composite.
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
Xiaoqiang Zhang,Quanlei Wang,Chuang Wang,Junli Ren,Xinze Du,Huixiang Li,Da-Ming Gao
Efficient hydrodeoxygenation (HDO) of biomass-derived phenolics relies on the effective coupling of hydrogen activation and C-O bond cleavage. Here, we report a Ni-NiO interfacial catalyst that enables interfacial synergy by integrating hydrogenation and deoxygenation functions within a confined nanoscale interface. By tailoring the reduction temperature of NiO/Al 2 O 3 , the Ni/NiO ratio is precisely controlled, with the catalyst reduced at 400 °C exhibiting highly dispersed Ni species intimately interfaced with NiO. Mechanistic studies suggest that hydrogen dissociated on metallic Ni can spill over to adjacent NiO, generating interfacial hydrogen species and enhanced acidity that facilitate C-O bond cleavage. Meanwhile, the close proximity of Ni and NiO enables efficient coupling of the hydrogenation and deoxygenation functions, thereby promoting rapid tandem conversion at the interface and lowering the apparent activation barrier for vanillin HDO.
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Plasma Processes and Polymers
·
2026
·Vol. 23
·期 6
·e70198
·
IF 3.2
Kai Li,Jiajun Peng,Tianyu Liang,Feifan Zhang,Fangjie Zhou,Yuzhen Jin,Liancheng Zhang,Hua Pan,Fada Feng,Xuming Zhang
The reaction mechanism of plasma-catalytic CO 2 methanation remains unclear, especially regarding the Ni size effect. To address this, a tunable NiAl catalyst was explored. A linear correlation exists between methanation activity and Ni particle size: CO 2 conversion increases with larger Ni particles. The NiAl-300 catalyst (5.8 nm) achieved 86% CO 2 conversion and 100% CH 4 selectivity, while NiAl-500 (2.6 nm) reached only 63% and 98%, respectively. In situ DRIFTS revealed that larger Ni particles promote hydrogenation of formate and HCO species due to their efficient utilization of plasma-induced H radicals. This work provides theoretical support for rationally designing efficient catalysts in plasma-catalytic CO 2 methanation systems.
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