JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 12
·B495
·
IF 3.259
Dan Liu,Sheying Dong,Wenbo Wei,Yile Fu,Tinglin Huang
Ni/NiO/C composites were prepared by successively thermal annealing Ni-based metal organic frameworks (Ni-MOFs) in nitrogen and air atmosphere. Moreover, comparative electrochemical properties of the material before and after calcination were investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The result indicated that the Ni/NiO/C was more suitable for the matrix of myoglobin (Mb)/hemoglobin (Hb) immobilization to fabricate enzyme-based biosensor for the detection of nitrite (NO2−). Among them, the Mb-based biosensor exhibited a wider linear range from 4 to 40892 μM with a lower detection limit of 1.3 μM (S/N = 3) toward NO2−. The good electrochemical properties of Ni/NiO/C could be mainly due to the synergistic integration of MOFs-derived Ni, NiO and carbon hybrids, which could work as electron conducting pathways between the Mb (Hb) and the electrode surface to facilitate the electron transfer process. Therefore, this work suggested that MOF-derived composites have a great potential for constructing wide range of sensing interface.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2017
·
IF 2.895
Aiqin Li,Kui Shen,Junying Chen,Zhong Li,Yingwei Li
The selective hydrogenation of phenol is an attractive routine to produce cyclohexanol that is an important basic chemical raw in chemical industry, but the design of cost-efficient and highly selective catalysts remains a great challenge. Herein, we report the first example of non-noble bimetallic nanocatalysts for the selective hydrogenation of phenol with cyclohexanol as the sole product. These catalysts consisting of bimetallic Ni-Co alloy nanoparticles (NPs) encapsulated in N-doped carbon matrix were simply synthesized by using our previously developed MOF-templated strategy (Long et al., 2016). The sum of characterization results revealed that the Co and Ni elements were successfully alloyed in every individual NPs that were confined by N-doped carbon layers. Detailed catalytic test results suggested that both the pyrolysis temperature and the composition of these alloy NPs played the key roles in guiding their catalytic performance in the selective hydrogenation of phenol. It has been shown that Co-Ni@NC system was much more effective for hydrogenation of phenol than Cu@NC, Co-Cu@NC and Ni-Cu@NC systems. The optimal 1Co-1Ni@NC could completely catalyze the hydrogenation of phenol to >99.9% cyclohexanol with a TOF of 0.21 h −1 , which was approximately 2.8- and 4.3-fold higher than that of the Co@NC and Ni@NC respectively, underscoring a strong positive synergistic effect between Ni and Co for this reaction. The mechanism study revealed the cyclohexanol was formed directly by the one-step hydrogenation of phenol in our catalyst system. This one-step pathway could avoid the formation of other hydrogenated intermediate product thereby leading to >99.9% selectivity of cyclohexanol. Furthermore, this catalyst also showed good recyclability, magnetically reusability and general applicability for a wide range of phenol substrates, which together with the superior activity and selectivity make it a good potential for the industrial applications.
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高影响因子
CATALYSIS TODAY
·
2016
·
IF 4.312
Kun Jiang,Dong Sheng,Zihao Zhang,Jie Fu,Zhaoyin Hou,Xiuyang Lu
Mixed MgO–Al 2 O 3 (with different Mg/Al ratio) supported nickel catalysts were prepared via co-precipitation method and used for hydrogenation of levulinic acid to γ-valerolactone under mild condition. Characterization results indicated that mixed MgO–Al 2 O 3 supported Ni catalysts possessed bigger surface area than that of Ni/MgO and Ni/Al 2 O 3 , and Ni dispersed highly on the surface of mixed MgO–Al 2 O 3 support. It was found that mixed MgO–Al 2 O 3 supported Ni catalysts were more active and selective for the hydrogenation of levulinic acid to γ-valerolactone than that of Ni/MgO and Ni/Al 2 O 3 , and the best yield of γ-valerolactone at 160 °C, 1 h and 3 MPa H 2 reached 99.7% over Ni/MgAlO 2.5 , and Ni/Mg 2 Al 2 O 5 could be recycled without obvious loss of its initial activity.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 17
·6376-6384
·
IF 8.262
Na Ma,Yi (Alec) Jia,Xianfeng Yang,Xilin She,Longzhou Zhang,Zhi Peng,Xiangdong Yao,Dongjiang Yang
Developing earth-abundant, active and stable electrocatalysts which operate in two-electrode rechargeable metal–air batteries, including both oxygen evolution and reduction reactions (OER and ORR), is vital for renewable energy conversion in real application. Here, we demonstrate a three-dimensional (3D) bifunctional nanoaerogel electrocatalyst that exhibits good electrocatalytic properties for both OER and ORR. This material was fabricated using a scalable and facile method involving the pyrolysis of (Ni,Co)/CNT alginate hydrogels derived from sustainable seaweed biomass after an ion exchange process. The bifunctionality for oxygen electrocatalysis as shown by the OER–ORR potential difference (ΔE, the OER and ORR potentials are taken at the current densities of 10 mA cm−2 and −3 mA cm−2 in 0.1 M KOH, respectively) could be reduced to as low as 0.87 V, comparable to the state-of-the-art non-noble bifunctional catalysts. The good performance was attributed to the ternary Ni/NiO/NiCo2O4 catalytic center for charge transfer and 3D hierarchical mesoporous hybrid framework for efficient mass transport. More importantly, the Zn–air battery fabricated with the hybrid nanoaerogel as a bifunctional electrocatalyst displays very high energy efficiency (58.5%) and long-term stability. Prospectively, our present work may pave a new way to develop earth-abundant and low cost high-performance bifunctional electrocatalysts for rechargeable metal–air batteries.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 6
·3535-3544
·
IF 2.302
Gao Xiufeng,Chen Shaoping,Dong Feng,Hu Lifang,Yang Renyao,Wang Wenxian,Munir Zuhair A.
The diffusion bonding between Ti and Ni was investigated in the presence and absence of an imposed electric current. Bonding was carried out over the temperature range of 873–1123 K and the current density range of 255–350 A/cm 2 . The formation and sequence of evolution of the three intermetallic phases, TiNi 3 , TiNi, and Ti 2 Ni, were investigated and discussed in light of calculations of Gibbs free energies of formation and interfacial energies associated with their nucleation. Within the experimental times and in the presence of a current, the growth of the three phases was parabolic. The evolution of the TiNi phase required an incubation period, while the relatively high growth rate of TiNi 3 suggests the possibility of another mechanism. The growth of all phases was enhanced by the application of a direct current, with no apparent dependence on its direction.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Bo Xu,Zhiming Chen,Haijing Zhang,Yiqiang Sun,Cuncheng Li
Development of efficient catalyst with low-cost, earth-abundant metals for sustainable hydrogen generation is still an intriguing challenge. Doping of cation or anion is regarded as an effective approach for ingenious modulation of chemical composition related to the electrocatalysts for improving their activity. Herein, a ternary Ni(S 0.49 Se 0.51 ) 2 porous flakes array on carbon fiber cloth (CFC) via simultaneous sulfuration and selenylation of Ni(OH) 2 flakes. Owing to the synergistic effect between Ni, S and Se atoms, high surface area, abundant active site and good conductivity of the Ni(S 0.49 Se 0.51 ) 2 /CFC, the as-synthesized catalyst requires lower overpotential (113 mV) than pure NiS 2 /CFC and NiSe 2 /CFC to drive 10 mA cm −2 for hydrogen evolution reaction (HER) in 1.0 M KOH with good sustainability.
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Journal of Energy Chemistry
·
2016
·
IF 2.322
Panpan Yang,Qineng Xia,Xiaohui Liu,Yanqin Wang
The catalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) has attracted extensive research interests because DMF can be used as potential and competitive renewable transportation fuel or additives. Here we report a non-noble bimetallic catalyst with improved activity for hydrogenation and hydrogenolysis by introducing active carbon as support into a nickel–cobalt catalyst. The characterizations of the catalyst indicate that the Ni and Co species are uniformly dispersed on the active carbon through the wetness impregnation method. The influences of reaction temperature and hydrogen pressure are systematically investigated and an excellent yield (up to 95%) of DMF can be obtained at relatively mild conditions, 130 °C and 1 MPa H 2 , over the carbon supported Ni–Co bimetallic catalyst. The high catalytic activity originates from the synergistic effect between Ni and CoO x species, the high BET surface area of the catalyst, and the uniform dispersion of Ni and Co species on the active carbon. The catalyst could be reused for 5 times without loss of activity in a batch reactor . Futhermore, the conversion of HMF to DMF on a fixed-bed reactor was also investigated and the 2%Ni–20%Co/C catalyst exhibited an excellent yield to DMF (>90%) for 71 h time on stream, indicating the high activity and stability of the catalyst.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Zhenyuan Ji,Yuqin Wang,Xiaoping Shen,Hanyu Ma,Juan Yang,Aihua Yuan,Hu Zhou
In this study, reduced graphene oxide (RGO) supported Ni nanoparticles were synthesized by a facile in-situ refluxing approach using triethylene glycol as both reductive and dispersing agent . The as-synthesized RGO/Ni nanocomposites were characterized by X-ray diffraction, Raman spectroscopy and transmission electron microscopy , which revealed that Ni nanoparticles with hexagonal close-packed structure were homogeneously dispersed on the surface of RGO sheets. The catalytic activity and electrochemical properties of the RGO/Ni nanocomposites were investigated. It is found that the RGO/Ni nanocomposites exhibit markedly enhanced catalytic activity toward the reduction of p -nitrophenol by NaBH 4 , which is comparable to noble metal catalyst. The RGO/Ni nanocomposites also exhibited excellent electrocatalytic response to glucose. The linear range, detection limit and sensitivity were estimated to be 0.01–3.0 mM ( R 2 = 0.997), 2.8 μM and 535.258 μA mM −1 cm −2 , respectively. It is expected that this facile method presented here could be extended to synthesize other RGO/metal nanocomposites with various functions.
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PubMed
高影响因子
KINETICS AND CATALYSIS
·
2024
·Vol. 65
·期 3
·251-260
·
IF 1.3
Yang Zhi,Luo Mingsheng,Liu Qinglong,Li Chenmeng,Wang Yatao,Li Hongjuan,Yao Lifei
Abstract The direct production of higher alcohols from syngas in a single step remains a great challenge. In this work, a series of K and Ni promoted Mo 2 C/Al 2 O 3 catalysts were prepared by impregnation method to enhance the selectivity of Mo 2 C-based catalysts for the one-step conversion of syngas to higher alcohols. The catalysts were continuously tested under the following conditions: 300°C, 3.0 MPa, velocity—11.50 \({\text{Lg}}_{{{\text{Mo}}}}^{{ - 1}}\) h –1 , H 2 /CO ratio of 2. The catalysts promoted with K and Ni demonstrated the highest total alcohol selectivity of 67.7%. Moreover, the selectivity for total C 2+ alcohols reached as high as 56%, with 37% being ethanol. X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS) characterization data reveal that K can promote the crystallinity of β-Mo 2 C, lower the catalyst reduction temperature and increase the proportion of high-valent Mo on the catalyst surface. In addition, adding Ni as a promoter to the KMo 2 C/Al 2 O 3 catalyst can generate a synergistic effect to further enhance the catalytic activity and the selectivity of higher alcohols.
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高影响因子
FUEL
·
2024
·
IF 6.7
Shan Jiang,Qian Zhang,Xizi Lin,Wenjun Liu,Songbai Qiu,Riyang Shu
Hydrodeoxygenation (HDO) is an effective method for upgrading lignin-derived phenolic compounds into high-quality liquid fuels, and the support rational design of HDO catalysts is critical for boosting reaction efficiency. In this study, a series of Ni/Al 2 O 3 -C catalysts with different ratio of Al 2 O 3 and carbon components were proposed for the HDO of lignin-derived phenolic compounds. Ni/Al 2 O 3 -C-0.25 catalyst is screened for a superior HDO efficacy compared to the other catalysts, in which guaiacol can be completely converted at 220 °C, with 99.9 % cyclohexane selectivity produced at 4 h. Various characterizations for the catalysts were carried out, including BET, XRD, TEM, XPS and NH 3 -TPD. According to the characterization results, Ni/Al 2 O 3 -C-0.25 catalyst presents little dense Al 2 O 3 fiber structure, which favors the Ni metal dispersion and possesses the smallest Ni metal particle size (10.9 nm). This leads to the outstanding catalytic hydrogenation activity. Moreover, the specific interaction between Al 2 O 3 and carbon in Ni/Al 2 O 3 -C-0.25 catalyst results in the moderate acid property, which promotes the deoxygenation process of the intermediate products, as evidenced by the effective cleavage of C-O bond and the enhanced selectivity of cyclohexane products. The adaptation of Ni/Al 2 O 3 -C-0.25 catalyst to lignin-oil upgrade was also investigated, with a rise of hydrocarbon content from 6.1% to 47.5%. These results indicate that the catalysts with this composite support had the potential to upgrade lignin-derived phenolic compounds to superior grade hydrocarbon liquid fuels.
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RSC Advances
·
2024
·Vol. 14
·期 36
·26604-26610
·
IF 3.9
Xiaodi Zhang,Xiyuan Tong,Junyang Wang,Xinyu Zhu,Zhuozhe Li,Fang Fang,Kun Qian,Yifeng E
We have prepared a highly active and stable copper-doped nickel electrocatalyst. Cu/Ni-doped MFI-type protozeolite layered nanoclusters electrodes have a large electrochemically active surface area (ECSA) and good HER activity, as well as excellent durability. The addition of Cu greatly increases hydrogen evolution reaction (HER) activity under acidic conditions. At the same time, the in situ grown Cu2+1O provides some activity, and in addition, the interface constructed between Cu and Ni further generates sufficient electrochemically active surface area. The activated Cu/Ni-doped MFI-type layered nanoclusters required only a 385 mV overpotential to generate 10 mA cm−2, demonstrating efficient and stable activity with potential practical applications.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shouheng Xu,Meichun Qin,Jingqi Qi,Laurence A. Belfiore,Jianguo Tang
The electrocatalytic reduction reaction of nitrate (NO 3 − ) to ammonia (NH 3 ) provides an efficient and clean NH 3 production method, which has the potential to replace the traditional industrial preparation methods. However, the limited activity and Faraday efficiency (FE) of existing catalysts impede the practical application of this technology. Herein, in this work, a high-performance catalyst with high NH 3 yield and FE was fabricated. Co–Ni bimetallic oxide (NiCo 2 O 4 ) catalysts with tuned surface oxygen vacancies (OVs) contents were prepared by changing the heating rate during calcination, NiCo 2 O 4 calcined at a heating rate of 5 °C/min (NiCo 2 O 4 -5) possessed the highest surface OVs content. Experimental studies showed that NiCo 2 O 4 with higher surface OVs had better NO 3 RR activity, inhibited the production of nitrite (NO 2 − ), and exhibited higher selectivity to NH 3 . Among prepared catalysts, NiCo 2 O 4 -5 demonstrated superior performance in electrocatalytic reduction of NO 3 − to NH 3 , achieving a high NH 3 FE (94.4 %) and yield (193.2 mmol/h g −1 ) at a suitable applied voltage. Besides, in situ Fourier transform infrared spectroscopy analysis suggested that NiCo 2 O 4 -5 preferentially followed the NO 3 RR pathway as follows: *NO 3 → *HNO 3 → *NO 2 → *HNO 2 → *NO → *HNO → *N → *NH → *NH 2 → *NH 3 .
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高影响因子
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