Scientific Reports
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2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Xu Peiman,Li Jingwei,Luo Jiaxian,Wei Licheng,Zhang Dawei,Zhou Dan,Xu Weiming,Yuan Dingsheng
Earth-abundant and efficient bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly significant for renewable energy systems. However, the performance of existing electrocatalysts is usually restricted by the low electroic conductivity and the limited amount of exposed active sites. In this work, (Fe 0.2 Ni 0.8 ) 0.96 S tubular spheres supported on Ni foam have been prepared by a sulfuration of FeNi layered double hydroxide spheres grown on Ni foam. Benefiting from the unique tubular sphere architecture, the rich inner defects and the enhanced electron interactions between Fe, Ni and S, this electrocatalyst shows low overpotential of 48 mV for HER at 10 mA cm −2 in 1.0 mol L −1 KOH solution, which is one of the lowest value of non-previous electrocatalyts for HER in alkaline electrolyte. Furthermore, assembled this versatile electrode as an alkaline electrolyzer for overall water splitting, a current density of 10 mA cm −2 is achieved at a low cell voltage of 1.56 V, and reach up to 30 mA cm −2 only at an operating cell voltage of 1.65 V.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2018
·Vol. 43
·期 1
·430-438
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IF 3.009
Xiuman Wang,Qian Zhang,Xiaofeng Shi,Ning Wang,Yujun Chai
Summary To analyze the effect of Co and Ni on hydrogen generation in water, the reactions of Mg and Al with water in CoCl 2 and NiCl 2 solutions are studied in terms of amount of H 2 produced and rate of reaction. Mg rapidly reacts with water in CoCl 2 and NiCl 2 , producing high amount of H 2 without induction time. While there is a short induction time is detected for Al─H 2 O reaction in CoCl 2 and NiCl 2 . In addition to the galvanic cell behavior of the Mg (Al)/Co (Ni) compounds formed, Co and Ni catalyze the hydrogen production reaction; however, the agglomeration of Co or Ni leads to a noticeable decrease in H 2 production. The open-circuit potential in CoCl 2 and NiCl 2 solutions after the addition of Mg or Al at ambient temperature shows an obvious change, coinciding with the initiation of the hydrogen generation process. Mg rapidly reacts with water in Co (Ac) 2 , CoSO 4 , Ni (Ac) 2 and NiSO 4 solutions as a consequence of its intrinsic metallic properties and of the formation of Co or Ni. The hydrogen production amount is lower (<200 ml g −1 ) in Co (NO 3 ) 2 and Ni (NO 3 ) 2 , even after adding NaCl. No reaction occurs when adding Al in CoSO 4 , Co (Ac) 2 , Co (NO 3 ) 2 , NiSO 4 , Ni (Ac) 2 , and Ni (NO 3 ) 2 . The synergistic effect of Co, Ni, and anion ions in water affects the rate of Al or Mg corrosion and hydrogen generation.
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Daming Chen,Song Yan,Haijun Chen,Lu Yao,Wei Wei,Hualin Lin,Sheng Han
Hierarchical Ni–Mn Layered Double Hydroxide (Ni–Mn LDH) nanosheets grow on a nitrogen-doped carbon foam skeleton through a one-step hydrothermal reaction . LNCF-2 exhibits high specific capacitance (2128.3 F g −1 at 0.5 A g −1 ) and good cyclic stability (94.3% retention after 5000 cycles at 2 A g −1 ) as an electrode material for supercapacitors . Furthermore, as a positive electrode material for an asymmetric supercapacitors (ASCs), it also has a high specific capacitance (125.1 F g −1 at 0.5 A g −1 ) and an excellent cyclic stability (80.1% retention after 10000 cycles at 5 A g −1 ). The increase in electrochemical performance is attributed to the high Faradaic pseudocapacitance of Ni-Mn LDH and the introduction of three-dimensional carbon foam. Because the introduction of three-dimensional carbon foam can provide an interconnection network for electron and ion transfer, allowing efficient charge exchange.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Guodong Xu,Yuxiang Zuo,Bing Huang
In this paper, metal-organic framework-74-Ni/carbon nanotube (MOF-74-Ni/CNT) composite was synthesized via one-pot in situ hydrothermal reaction . The MOF-74-Ni/CNT was characterized and the electrochemical performance was investigated. The composite sulfur cathode prepared by impregnation method delivers a high initial discharge capacity, good rate capability and a low capacity decay of 0.087% per cycle over 400 cycles at 2 C. The significant electrochemical performance was attributed to the combination of the high affinity of MOF-74-Ni to polysulfide anions and the excellent electronic conductivity of carbon nanotube . These results suggest the design of high polar MOF materials with high conductive CNT is an effective strategy to construct a promising sulfur host for Li-S batteries .
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 21
·15118-15129
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IF 2.993
Liu Hao,Xu Jü,Liu Guanxi,Wang Meiri,Li Jing,Liu Yuanyuan,Cui Hongtao
Herein, a facile sol–gel strategy for building the ordered interpenetrating network of Ni(OH) 2 and reduced graphene oxide (rGO) was proposed. In this strategy, rGO nanosheets were homogeneously fixed inside composite utilizing the pores of Ni(OH) 2 gel as template, forming rGO-interpenetrated gel network. It was found that the rGO nanosheets could effectively reduce the internal resistant of composites and provide mechanical support for the gel network of Ni(OH) 2 . Therefore, the composite presented high electrochemical performance, especially high-rate performance, due to the interpenetrating of rGO nanosheets plus the supplementary role of acetylene black. It had high specific capacitance of 2163 F g −1 at low current density of 2.9 A g −1 and 733 F g −1 at high current density of 86.8 A g −1 .
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Jingrui Hu,Yingqing Ou,Yanhong Li,Di Gao,Yunhuai Zhang,Peng Xiao
Efficient and stable bifunctional electrocatalysts composed of Earth-abundant elements are crucial to the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). Herein, FeCo2S4 nanosheet arrays loaded on Ni foam (NF) are synthesized and first employed as a bifunctional electrocatalyst for full water-splitting. Remarkably, the self-assembled, binder-free, and cost-effective FeCo2S4/NF electrode shows high OER catalytic activity, which only requires an overpotential of 270 and 290 mV to achieve current densities of 50 and 100 mA cm–2, respectively. Moreover, the FeCo2S4/NF electrode exhibits considerable OER stability over 20 h at a static current density of 50 mA cm–2, with negligible potential change in alkaline electrolyte. Meanwhile, when serving as a catalyst for the HER under alkaline conditions, an overpotential of just 132 mV is required to deliver the current density of 10 mA cm–2. The structural investigation demonstrates the formation of a Co(Fe)-(oxy)hydroxides layer on the catalyst surface during the OER test, which could be the real active species. Furthermore, because of the high catalytic activity and stability of this bifunctional electrocatalyst, we prepared a high-performance overall water electrolyzer that could achieve a current density of 10 mA cm–2 at a cell voltage of 1.56 V.
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BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Leilei Dai,Yunpu Wang,Yuhuan Liu,Roger Ruan,Dengle Duan,Yunfeng Zhao,Zhenting Yu,Lin Jiang
Catalytic fast pyrolysis (CFP) of torrefied corn cob using Ni-modified hierarchical ZSM-5 catalyst was conducted in this study. The prepared catalysts were characterized by N 2 adsorption and desorption (N 2 -BET), X-ray diffraction (XRD), and temperature-programmed desorption of NH 3 (NH 3 -TPD). NaOH solution treatment resulted in the lower peak intensities of hierarchical ZSM-5 catalyst in the XRD patterns while Ni modification improved the catalyst framework. In addition, NaOH solution treatment created some mesopores or macropores, but the incorporation of Ni reduced BET surface area and volume of micropores. Though the addition of Ni lowered the acidity of catalyst, Ni-modified hierarchical ZSM-5 catalyst led to higher yields and of aromatic hydrocarbons. What is more, hierarchical ZSM-5 catalysts significantly improved the selectivities of mono-aromatics. Kinetic analysis shows that CFP of torrefied corn cob was second-order reaction and the addition of Ni can obtain a lower activation energy compared with hierarchical ZSM-5 catalyst.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 30
·期 3
·563-572
·
IF 2.137
Xiang Dong,Ruxiang Qin,Shibin Nie,Jinian Yang,Chi Zhang,Wei Wu
Reducing the fire hazard of polypropylene (PP) is an important research direction in the fields of fire safety materials. In this article, a novel Ni-containing char-forming agent (TTPN) was successfully synthesized, using tris(2-hydroxyethyl) isocyanurate (THEIC), terephthalic acid, and nickel dihydrogen phosphate. Then, TTPN was combined with the silica-gel microencapsulated ammonium polyphosphate (OS-MCAPP) to prepare intumescent flame retardant PP composites. From the results of the limiting oxygen index (LOI) test and cone calorimeter, the composite containing 30% IFR (OS-MCAPP: TTPN = 3:2) shows the highest LOI value of 33.5%, and its peak heat release rate is 275.5 kWm −2 , decreased by 79.0% and 37.4% than those of pure PP and the composite containing the char-forming agent without Ni. Meanwhile, the composite containing TTPN present the best smoke and CO 2 /CO suppression. The results indicate that TTPN has an excellent ability to dramatically reduce the fire hazard of PP.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 40
·期 1
·385-397
·
IF 0.88
Wang Yong,Chen Guihua,Zhang Fumin,Li Liquan
Ni-incorporated SBA-15 magnetic composites were two-stage hydrothermal synthesized from initial strong acidic media through a pH-adjusting method. The structure, morphology, surface area and pore size distribution of the samples were systematically characterized by using XRD, FT-IR, SEM, TEM and N 2 physical adsorption techniques. It was found that, when pH was adjusted to 7, the obtained sample still could exhibit hexagonal mesostructure, very similar to that of the pristine SBA-15 except for a slightly reduced long-range ordering and surface area. However, an increase in the unit cell and wall thickness of the samples suggested the more Ni species were incorporated into the framework of SBA-15. A further increase in pH to 9 produced deterioration of long-range ordering of the sample, possibly resulting from the blocking of some mesopores. Thus, the pH-adjusting method played an important role on the structure of Ni–SBA-15 composites. Measurements taken with increasing applied field revealed the samples having superparamagnetic behaviors. Furthermore, the saturation magnetization values were increased with the more Ni species transforming into magnetic nanoparticles by the increasing pH.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 19
·期 1
·229-239
·
IF 2.234
Zhang J. L.,Liu H. D.,Huang L. H.,Tan S. Z.,Mai W. J.,Cai X.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide (rGO&Ni(OH) 2 ) was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The results showed that the agglomeration and re-stacking of rGO could be effectively prevented, resulting in few-layer rGO nanosheet with high specific surface area of 891.22 m 2 /g which could supply large available area for loading nanoparticle. After the incorporation of Ni(OH) 2 nanoparticle, the rGO&Ni(OH) 2 composite owned excellent electrochemical performance thanks to effective prevention of agglomeration and re-stacking of rGO with large size of the sp 2 domain, no residual of pre-stabilizer of ammonia, and tight contact between rGO and Ni(OH) 2 . Specifically, the rGO&Ni(OH) 2 electrode exhibited excellent stability at scan rates from 100 to 300 mV/s. A high specific capacitance of 1,008 F/g was obtained at high current density of 42 A/g in 6 mol/L KOH aqueous electrolyte, and the specific capacitance demonstrated good rate capability. Moreover, rGO&Ni(OH) 2 electrode showed a long cycle life, retaining 74 % specific capacitance after 2,000 cycles at current density of 6 A/g. The advantages of easy process and excellent electrochemical property suggested great potential application of rGO&Ni(OH) 2 in supercapacitors.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The obtained material owned excellent electrochemical property, including high capacitance, good rate capability, excellent stability, long cycle life, etc.
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JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Song-Il O,Jun-Min Yan,Hong-Li Wang,Zhi-Li Wang,Qing Jiang
Ni/La 2 O 3 nanocatalyst with Pt and Rh content as low as 5 mol%, respectively, is successfully synthesized by a facile co-reduction method in the presence of hexadecyl trimethyl ammonium chloride aqueous solution under ambient atmosphere. Interestingly, the resulted Ni/La 2 O 3 catalyst with low cost exhibits excellent catalytic activity to dehydrogenation of hydrous hydrazine (N 2 H 4 ·H 2 O), producing hydrogen with 100% selectivity at room temperature (298 K), which represents a promising step toward the practical application for N 2 H 4 ·H 2 O system on fuel cells.
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高影响因子
CATALYSIS TODAY
·
2014
·
IF 3.309
Junjie Zhang,Fang Lu,Weiqiang Yu,Jiazhi Chen,Shuai Chen,Jin Gao,Jie Xu
The use of high pressure fossil derived hydrogen limits the commercial prospects of transforming sorbitol to glycols. Ni–Re/C catalyst which was developed in this study demonstrated high selectivity toward hydrogenative cleavage of C2–C3 and C3–C4 bonds of sorbitol to produce glycols under 1 MPa nitrogen. Acetol which is proposed as important intermediate to explain the reaction mechanism was first detected in the sorbitol conversion reactions. Detailed investigations showed that the presence of Re could prevent the sintering of Ni particles during the reduction process and make the catalyst efficiently generate hydrogen on the active sites to selectively cleave C–C bonds in sorbitol under nitrogen atmosphere.
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