Batteries-Basel
·
2023
·Vol. 9
·期 1
·46
·
IF 4
Yingping Bu,Yawen Zhang,Yingying Liu,Simin Li,Yanlin Zhou,Xuefen Lin,Zicong Dong,Renchun Zhang,Jingchao Zhang,Daojun Zhang
Effective and inexpensive electrocatalysts are significant to improve the performance of oxygen evolution reaction. Facing the bottleneck of slow kinetics of oxygen evolution reaction, it is highly desirable to design the electrocatalyst with high activity, good conductivity, and satisfactory stability. In this work, nickel foam supported hierarchical Co9S8–Ni3S2composite hollow microspheres were derived from in situ-generative MOF precursors and the subsequent sulfurization process by a simple two-step solvothermal method. The composite microspheres were directly grown on nickel foam without any binder, and nickel foam was used as the nickel source and support material. The morphology and constitution of the series self-supported electrodes were characterized by SEM, TEM, XRD, XPS, and Raman, respectively. The unique porous architecture enriched the electrode with sufficient active surface and helped to reactants and bubble evolved during electrochemical water oxidation. Through tuning the concentration of cobalt source and ligand, the content ratio of Co9S8and Ni3S2can be modulated. The heterostructures not only afford active interfaces between the phases but also allow electronic transfer between Co9S8and Ni3S2. The optimized Co9S8-Ni3S2/NF-0.6 electrode with the highest electrochemical surface area and conductivity shows the best OER performance among the series electrodes in 1 M KOH solution. The overpotential of Co9S8-Ni3S2/NF-0.6 is only 233 mV when the current density is 10 mA cm−2, and corresponding Tafel slope is 116.75 mV dec−1. In addition, the current density of Co9S8-Ni3S2/NF-0.6 electrocatalyst hardly decreased during the 12 h stability measurement. Our approach in this work may provide the future rational design and synthesis of satisfactory OER electrocatalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yong Liu,Siyu Yu,Xinyu Wu,Xueyu Cao,Haojie Geng,Cuijuan Zhang,Shetian Liu
Non-precious metal catalysts suitable for hydrogen production via aqueous phase reforming (APR) of methanol show important technical and commercial value in the development of distributed, small/micro-scale on-site hydrogen production systems. They still face the challenges of reduced activity and stability due to sintering and oxidation of active metal nanoparticles , change of the surface state and collapse of the pore structure of used supports under hydrothermal conditions. To solve these problems, a series of ZnO/Ni-xCu/Al 2 O 3 (x = 0, 2, 4, 6, 8, 10) catalysts were prepared by a simple impregnation method in this work. The addition of Cu improved the reducibility of NiO, and promoted the formation of smaller and more dispersed metal particles on the surface of Al 2 O 3 , facilitating hydrogen production and hindering methane formation. Among them, the highest average hydrogen production rate (362.1 μmol‧min −1 ‧gcat −1 ) and the highest hydrogen selectivity (99%) were reached using ZnO/Ni-8Cu/Al 2 O 3 catalyst, which were 1.6 times and 20.7% higher than those obtained on the mono-metallic ZnO/Ni/Al 2 O 3 catalyst, respectively. On the other hand, the modification of Ni-8Cu/Al 2 O 3 with ZnO prevented effectively the reaction of surface water with Al 2 O 3 and inhibited the formation of boehmite phase, leading to dramatical improvement of its stability during APR of methanol with a prolonged lifetime (72 h) by 6 times. This new developed ZnO/Ni-xCu/Al 2 O 3 catalysts offer great potential for the development of commercial catalysts to produce hydrogen from APR of methanol.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Meng Zhang,Junfeng Zhang,Yingquan Wu,Junxuan Pan,Qingde Zhang,Yisheng Tan,Yizhuo Han
Carbon deposition on the catalyst surface has been considered as one of the main reasons to cause Ni catalyst deactivation during methane reforming with carbon dioxide (DRM). Generally, it is thought that the properties and levels of coke formation are significantly affected by the ability of CO 2 adsorption and activation, which is closely related to the oxygen species over catalyst surface. In this study, the effects of oxygen species on the DRM over Ni/ZrO 2 catalysts were investigated. Wherein, ZrO 2 support was further treated under H 2 , N 2 , and O 2 atmospheres respectively to obtain different oxygen species distribution over the surface, and 3 wt.% Ni was introduced by the deposition-precipitation method. The representative samples were characterized using XRD, EPR, XPS, FTIR, TPR, TPD , TPSR, TG, Raman and TPH techniques, etc. It was found that the treatment to ZrO 2 in the reducing gas such as H 2 was able to promote the formation of adsorbed oxygen species over the surface. CO 2 DRIFTS and CH 4 -TPSR experiments further confirmed that adsorbed oxygen species were favorable for enhancing both CO 2 adsorption and activation and CH 4 dissociation. As a result, the catalyst with more adsorbed oxygen species exhibited relatively outstanding performance for the DRM and promotional ability in removal of the deposited carbon.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Weiwei Mao,Haiping He,Zhizhen Ye,Jingyun Huang
A facile and in-situ electrochemical nanofabrication towards three-dimensional graphene@nickel foam (3DGF) to produce Ni(OH) 2 nanosheets was proposed and the integrated Ni(OH) 2 /3DGF electrode for glucose sensing was researched. The nanofabrication of chemical battery reaction is mild and facile. Nanopores formation plays a key role in promoting the growth of Ni(OH) 2 nanosheets, leading to enhanced electro-catalysis. In this constructed unique 3D hierarchical architecture, graphene layers not only provide excellent electrical conductivity but also benefit to the sensing stability, while the 3D interconnected structure prevents the agglomeration or exfoliation of Ni(OH) 2 nanosheets and the porous Ni(OH) 2 film benefits to the mass and charge transfer, and thus improving the sensing performance remarkably. As a successful demonstration, the fabricated Ni(OH) 2 /3DGF glucose sensor exhibits an appreciable sensitivity 2366 μA mM −1 cm −2 and a low detection limit of 0.32 μM. This study proposes an easy and convenient strategy to prepare Ni(OH) 2 and graphene integrated glucose sensor, promisingly applied in practice.
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ChemCatChem
·
2019
·Vol. 11
·期 11
·2649-2656
·
IF 4.495
Kuo Zhou,Haiyan Liu,Huimin Shu,Shuwen Xiao,Dechao Guo,Yingxin Liu,Zuojun Wei,Xiaonian Li
Graphical Raney to the rescue ! High value-added 2,5-bisaminomethylfuran was one-pot synthesized from 5-HMF over Raney Ni with a yield of 60.7 %. DFT calculations were conducted to support our speculation that Ni can harmonize NH 3 and H 2 on its surface most suitably for the reductive amination reactions. Reductive amination of furfuryl alcohol, furfural and 5-hydroxymethylfurfural (5-HMF) were carried out on various metal catalysts. Over Raney Ni catalyst, we obtained the highest furfurylamine yields of 81.8 % and 94.0 % from furfuryl alcohol in absence and presence of H 2 , respectively. While furfural was used as the substrate, 100 % yield of furfurylamine could be achieved over Raney Ni under rather moderate conditions. Although 5-HMF was completely converted over all catalysts used, the highest yield of 2,5-bisaminomethylfuran (60.7 %) was obtained over Raney Ni at 160 °C in 12 h. The DFT calculations on the adsorption behavior of NH 3 and H 2 on different metal surfaces showed that the difference of the adsorption energy between NH 3 and H 2 on Ni is lower than those of other metals, indicating that less metal active sites on Ni surface is occupied by NH 3 , which leaves more active sites for dehydrogenation/hydrogenation reactions and in the end promotes the reductive amination reactions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Fanghui Wang,Yimeng Luo,Yanan Wang,Hong Zhu
In this work, a spherical spider web-like structure Ru Ni/Ni foam catalyst was prepared for hydrogen evaluation from sodium borohydride (NaBH 4 ) by a combination of electroless plating and electroplating. Microstructure, surface morphology , surface area and elemental composition of the Ru Ni/Ni foam catalyst were analyzed by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM-EDS and X-ray Photoelectron Spectroscopy (XPS), Brunauere-Emmette-Teller method (BET, AS-1C-VP), respectively. The influences of Ru Ni with different molar ratios , NaOH concentration, NaBH 4 concentration, and solution temperature on the hydrogen production rate were investigated in this paper. The results showed that the Ru Ni metals were arrayed densely and uniformly on the surface of Ni foam. The average hydrogen production rate is 360 mL min −1 g −1 in 20 wt % of NaBH 4 , 1 wt% of NaOH at 30 °C in the presence of the Ru Ni/Ni foam catalysts. The calculated activation energy was 39.96 kJ mol −1 for hydrogen production from sodium borohydride using the Ru Ni/Ni foam catalyst.
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Advanced Energy Materials
·
2019
·Vol. 9
·期 10
·1803185
·
IF 24.884
Meixuan Li,Yun Zhu,Huiyuan Wang,Ce Wang,Nicola Pinna,Xiaofeng Lu
It is urgently required to develop highly efficient and stable bifunctional non-noble metal electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for water splitting. In this study, a facile electrospinning followed by a post-carbonization treatment to synthesize nitrogen-doped carbon nanofibers (NCNFs) integrated with Ni and Mo 2 C nanoparticles (Ni/Mo 2 C-NCNFs) as water splitting electrocatalysts is developed. Owing to the strong hydrogen binding energy on Mo 2 C and high electrical conductivity of Ni, synergetic effect between Ni and Mo 2 C nanoparticles significantly promote both HER and OER activities. The optimized hybrid (Ni/Mo 2 C(1:2)-NCNFs) delivers low overpotentials of 143 mV for HER and 288 mV for OER at a current density of 10 mA cm −2 . An alkaline electrolyzer with Ni/Mo 2 C(1:2)-NCNFs as catalysts for both anode and cathode exhibits a current density of 10 mA cm −2 at a voltage of 1.64 V, which is only 0.07 V larger than the benchmark of Pt/C-RuO 2 electrodes. In addition, an outstanding long-term durability during 100 h testing without obvious degradation is achieved, which is superior to most of the noble-metal-free electrocatalysts reported to date. This work provides a simple and effective approach for the preparation of low-cost and high-performance bifunctional electrocatalysts for efficient overall water splitting.
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INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Jie Xu,Mingshuo Wang,Fei Yang,Xiaoqian Ju,Xilai Jia
Structural and compositional modulation of low-cost hydroxide is important for making efficient electrocatalysts of the oxygen evolution reaction (OER), and it is an ongoing challenge. Here, Ni–Fe–W hydroxide complex by incorporation of tungsten into nickel–iron layered double hydroxide was proposed and investigated. As-formed Ni–Fe–W hydroxide nanosheets are highly porous and self-supported on the carbon fiber substrates, which promote the exposure of the active metal sites for significantly enhanced OER activity. Moreover, the as-introduced tungsten is evidenced to be in a W6+ oxidation state which can facilitate charge transfer and electron capture and thereby decrease the critical conversion barrier of the absorbed OH– to O radical in OER. A series of Ni–Fe–W hydroxides were prepared, with the best molar ratio of Ni–Fe–W sources being 6:2:1. The optimal Ni6Fe2W-LDH@carbon fiber electrode delivers a low overpotential of 264 mV at 10 mA cm–2 and high stability (only 1.6% of the potential increase after 10 h) in alkaline electrolyte. Moreover, the structure of the constructed Ni–Fe–W hydroxide is evidenced to be stable and important for the electrocatalytically stable. The study is expected to open a new avenue in developing multiple hydroxides for low-cost and efficient electrocatalysts.
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PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2018
·Vol. 229
·期 3
·1-10
·
IF 1.769
Yi Yunqiang,Wu Juan,Wei Yufen,Fang Zhanqiang,Gong Yanyan,Zhao Dongye
Ni/Fe bimetallic nanoparticles have been widely used as strong reductants to degrade organic pollutants. Synthesis parameters of Ni/Fe nanoparticles can directly affect their characteristics and reactivity. In this study, Ni/Fe nanoparticles were prepared at different synthesis conditions, namely, synthesizing temperature, stirring rate, washing solutions, and preparation methods (post-coated and co-reducted Ni/Fe nanoparticles), and investigated their effectiveness of decabrominated diphenyl ether (BDE209) degradation. The results showed that the successive order of factors affecting the kinetics constant of Ni/Fe nanoparticles for the removal of decabrominated diphenyl ether (BDE209) were preparation methods, washing solutions, stirring rate, and synthesis temperature. It should be noted that the kinetics constants of post-coated Ni/Fe nanoparticles for removal of BDE209 was 0.049 min −1 , which was 14 times higher than that of co-reducted Ni/Fe nanoparticles. Moreover, the most remarkable influence on the particle size of Ni/Fe nanoparticles was the stirring rate, others synthesis conditions are mentioned in the following order: washing solutions > preparation methods > synthesis temperature. Interestingly, the effects of synthesis condition on the crystalline structure of Ni/Fe were weak. The results may facilitate more effective application of Ni/Fe nanoparticles for degradation of BDE209.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 19
·16329-16334
·
IF 3.201
Jian Cheng,Junhong Ma,Yuhua Ma,Cui Zhou,Yue Qiang,Xiaofeng Zhou,Jianya Yang,Haokun Shi,Yahong Xie
Dye-sensitized solar cells (DSSCs) have many advantages, but the use of expensive platinum counter electrodes (CEs) limits their industrial applications. In this work, a Co–Ni/carbon aerogel composite with a unique three-dimensional network structure and high specific surface area was prepared through simple ion exchange and carbonization of low-cost sodium alginate supramolecular hydrogels. Using this metal/carbon aerogel composite as the CE (hereafter denoted as CAE) of ZnO-based DSSCs, a photoelectric conversion efficiency (PCE) of 5.08% was obtained. This value was 94.44% of the PCE obtained using Pt. Analysis of current–voltage curves, cyclic voltammograms, and electrochemical impedance spectra revealed that the fabricated CAE had higher catalytic activity than a Pt CE and comparable charge-transfer ability. The adhesion of the CAE onto FTO was also strong with carbon paste as an adhesive.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Keyu Tao,Yun Gong,Qingfeng Zhou,Jianhua Lin
Co-Mo-O (Co 1.2 MoO 4.2 ·1.3H 2 O)/Ni 3 S 2 nanosheet arrays were in-situ grown directly on Ni foam (NF) by a facile two-step hydrothermal reaction , in which the untrathin Co-Mo-O nanosheets are connected to each other into a three-dimensional (3D) porous hierarchical architecture with Ni 3 S 2 entrapped on the underneath Ni support. The resulting Co-Mo-O/Ni 3 S 2 /NF exhibits an excellent electrocatalytic activity for oxygen evolution reaction (OER) in KOH solution, which yields a 50 mA cm −2 of OER current density at an overpotential of 0.29 V, outperforming the state-of-the-art noble RuO 2 (η 50 = 0.42 V), Co-Mo-O/NF (η 50 = 0.33 V) and Ni 3 S 2 /NF (η 50 = 0.31 V). And it demonstrates a high specific capacity of 340 mAh g −1 at 2 mA cm −2 with good capability (82.1% of the retention at 32 mA cm −2 ) in basic solution when used as supercapacitor electrode, which is superior to those of Co-Mo-O/NF (183 mAh g −1 ) and Ni 3 S 2 /NF (70 mAh g −1 ). The outstanding electrochemical performance of Co-Mo-O/Ni 3 S 2 /NF is associated with the synergistic effect of the individual components as well as the nanosheets directly grown on Ni conducting support with more active sites exposed. Furthermore, Co-Mo-O/Ni 3 S 2 /NF displays good durability in 12 h-electrolysis experiment for OER and 10000 charge-discharge cycles. It is expected to benefit from Ni 3 S 2 entrapped by the protective layer of 3D porous Co-Mo-O nanosheet arrays, which not only can provide channel for electrolyte ion to pass through, but also improve the stability of Ni 3 S 2 . In addition, the fabricated Co-Mo-O/Ni 3 S 2 /NF//Activated carbon (AC) asymmetrical supercapacitor shows an ultra-high energy density of 57.9 Wh kg −1 at a power density of 1.1 kW kg −1 .
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Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Haitong Tang,Xinru Yu,Shi Jin,Fanling Meng,Yan Yan,Zhongmin gao
Hierarchical carbon nanofibre (CNF)/SnO2/Ni nanostructures of graphitized carbon nanofibres and SnO2 nanocrystallines and Ni nanocrystallines have been prepared via divalent tin–alginate assembly on polyacrylonitrile (PAN) fibres, controlled pyrolysis and ball milling. Fabrication is implemented in three steps: (1) formation of a tin–alginate layer on PAN fibres by coating sodium alginate on PAN in a water medium followed by polycondensation in SnCl2 solution; (2) heat treatment at 450°C in a nitrogen atmosphere; (3) ball milling the mixture of CNF/SnO2 fibres and Ni powder. The CNF/SnO2/Ni nanocomposite exhibits good lithium ion storage capacity and cyclability, providing a facile and low-cost approach for the large-scale preparation of anode materials for lithium ion batteries.
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危险品化学品经营许可证（带存储）