ACS Applied Energy Materials
·
2021
·
IF 6.024
Jiahuan He,Zhendong Yao,Xuezhang Xiao,Wenzheng Chen,Ziwei Huang,Xiulin Fan,Zhong Dong,Xu Huang,Xuancheng Wang,Man Chen,Lixin Chen
The hydrolysis of AB has been regarded as a kind of secure and efficient method for hydrogen generation. However, the development of economical and stable catalysts with high catalytic activities remains a bottleneck for realizing further industrial application of AB. Herein, high-loading heterostructured Ni/NiO nanoparticles with different Ni/NiO weight ratios anchored on one-dimensional porous MoOx nanorods (denoted as Ni/NiO@MoOx) have been synthesized and introduced into the hydrolysis of AB for the first time. The Ni/NiO@MoOx-50H catalyst (synthesized under the reduction atmosphere of 50% H2/50% Ar) with an optimal Ni/NiO weight ratio (73.96/26.04) exhibits an excellent catalytic activity for the hydrolysis of AB with the turnover frequency (TOF) value reaching 86.29 molH2 molNi–1 min–1 at 298 K, which is one of the highest TOF values among the reported non-noble metal catalysts. In addition, on account of high Ni loading weight (29.15 wt %), the hydrogen generation rate of Ni/NiO@MoOx-50H achieves 10,478 mL·min–1 g–1 (35,947 mL·min–1 gNi–1), overtaking most values both in noble and non-noble metal catalysts for the hydrolysis of AB. The bridging effect of NiO steadily connects the Ni and MoOx carrier and promotes great durability of Ni/NiO@MoOx-50H, of which the catalytic activity exhibits not significant degradation in the fifth cycle. The catalysis originated from the metal/metal oxide (Ni/NiO@MoOx) provides a novel insight into the catalyst design, preparation, and application for chemical hydrogen storage systems.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Haowei Li,Xinlai Zheng,Huimin Zhang,Xuehui Li,Jinxing Long
Novel strategies for converting renewable lignin to bulk petrochemicals are highly desirable for achieving sustainable practices in the age of environmental awareness. Herein, we propose an efficient approach for the selective hydrogenolysis of lignin promoted by a cost-effective La3+-doped Ni/MgO catalyst. The results reveal that 84.44% lignin is converted at 270 °C for 4 h, yielding 16.50% volatile products. Importantly, approximately 43.45% of these volatile products are identified as 4-ethyl phenol (7.17% yield), an important intermediate in the fine chemical industry. Intensive analysis of the lignin before and after the reaction confirms that efficient cleavage of the ester linkages is achieved, which correlates directly with the high selectivity of 4-ethyl phenol after a readily decarboxylation reaction. Furthermore, the catalyst characterization demonstrates that La3+ suppresses the formation of a NiMgOx solid solution. Consequently, a greater degree of Ni2+ becomes reducible and the catalyst basicity becomes stronger, both of which are essential for the efficient lignin depolymerization and char reduction. As a result, a significant increase of the yield of volatile products is shown along with a substantial inhibition of biochar formation over the La-doped Ni/MgO catalyst in comparison with that without La doping. Therefore, the present work provides a new insight on producing fine chemicals via a sustainable route.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 36
·15396-15402
·
IF 3.288
Lina Zhang,Min Zhang,Libin Liu,Yanqin Wang,Jing Zheng,Jingli Xu
Decoration of transition metal Ni nanoparticles (NPs) on magnetic supports is of special interest for histine-rich protein adsorption. Through a combination of a hydrothermal reaction, a mussel-inspired coating and a carbonization strategy, we have investigated two synthetic paths to access hierarchical nickel-based magnetic nanostructures: (1) Fe3O4 spheres are covered with hierarchical NiMoO4 nanosheets and subsequently coated with a polydopamine (PDA) layer, and Fe3O4@MoO2∩C–Ni composites are synthesized after pyrolysis in a nitrogen atmosphere, and (2) Fe3O4 spheres are coated with PDA and subsequently covered with hierarchical NiMoO4 nanosheets, and then Fe3O4@C∩MoO2–Ni composites are obtained after pyrolysis in a nitrogen atmosphere. We find that only route 1, which can be defined as a space-confined carbonization strategy, results in the formation of a high coverage of nickel NPs with tiny diameter decorated on Fe3O4 spheres. Route 2, defined as a non-space-confined carbonization strategy, leads to the formation of low density and large size Ni NPs. Detailed examination of the nickel-based magnetic composites obtained by route 1 displayed superior adsorption capacity for BHb than that of route 2. The results demonstrated that the space-confined strategy is greatly beneficial for the synthesis of Ni-based magnetic composites with high coverage, which would pave a novel way for synthesizing high density Ni-based magnetic composites.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xue Wang,Hanping Zhang,Quanguo Zhai,Yucheng Jiang,Mancheng Hu,Shuni Li
In this work, the high-quality protonated Ni-doped MnO 2 (H–Ni–MnO 2 NRs) nanorods with a mean diameter of about 15 nm were synthesized by a hydrothermal method , which was successfully applied to Cs + adsorption under electrochemical process. The as-prepared H–Ni–MnO 2 NRs showed high selectivity to Cs + adsorption in both acidic and neutral media. In particular, the amount of Cs + adsorption increased with increasing solution pH. The adsorption capacity of H–Ni–MnO 2 NRs for Cs + could reach up to 11.5 mmol·g −1 at pH 7, much higher than previous reports (0.06–6 mmol·g −1 ). The high adsorption of H–Ni–MnO 2 NRs ability could be attributed to their especial morphology, Ni doping, and Mn(III) amount enhancement induced by electrochemical reduction .
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xianshu Qiao,Hongjun Kang,Yang Li,Kai Cui,Xin Jia,Henghao Liu,Wei Qin,Max Pupucevski,Gang Wu
We report a highly efficient and stable electrode composed of a porous Fe-doped β-nickel hydroxide nanopyramid array supported on nickel foam (U–Fe-β-Ni(OH)2/NF) for overall water splitting. The unique structure is assembled via a self-templated strategy by utilizing the FeNi oxalate (FeNi–C2O4/NF) nanopyramid as the templates, followed by an anion-exchange reaction at room temperature. Due to the intrinsic activity of Fe-doped β-Ni(OH)2 along with unique porous array structures consisting of two-dimensional (2D) active materials on three-dimensional (3D) conductive substrates, the developed electrode exhibited outstanding electrocatalytic activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline medium. The introduced amount of Fe plays a significant role in promoting OER and HER activity compared to the β-Ni(OH)2 electrode. The optimal electrode (U–Fe-β-Ni(OH)2/NF-2) generated a current density of 10 mA cm–2 at low overpotentials of 218 mV for the OER and 121 mV for the HER. The electrode also demonstrated considerably stable performance during the continuous water splitting process. Furthermore, we elucidated the promotion mechanisms of the active Fe-doped β-Ni(OH)2 compound for the OER and HER based on extensive characterization and electrochemical measurements. Hence, this work provides a facile approach to developing low-cost, efficient, and stable hydroxide-based electrodes for bifunctional OER and HER in water splitting.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jing Zhou,Hansheng Xiao,Wei Weng,Dong Gu,Wei Xiao
Implementation of non-precious electrocatalysts is key-enabling for water electrolysis to relieve challenges in energy and environmental sustainability. Self-supporting Ni-V 2 O 3 electrodes consisting of nanostrip-like V 2 O 3 perpendicularly anchored on Ni meshes are herein constructed via the electrochemical reduction of soluble NaVO 3 in molten salts for enhanced electrocatalytic hydrogen evolution. Such a special configuration in morphology and composition creates a well confined interface between Ni and V 2 O 3 . Experimental and Density-Functional-Theory results confirm that the synergy between Ni and V 2 O 3 accelerates the dissociation of H 2 O for forming hydrogen intermediates and enhances the combination of H* for generating H 2 .
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 9
·2109
·
IF 3.267
Changzhou Chen,Peng Liu,Haihong Xia,Minghao Zhou,Jiaping Zhao,Brajendra K. Sharma,Jianchun Jiang
It is of great importance to explore the selective hydrogenolysis of β-O-4 linkages, which account for 45–60% of all linkages in native lignin, to produce valued-added chemicals and fuels from biomass employing UV light as catalyst. TiO2exhibited satisfactory catalytic performances in various photochemical reactions, due to its versatile advantages involving high catalytic activity, low cost and non-toxicity. In this work, 20 wt.% Ni/TiO2and oxidant PCC (Pyridinium chlorochromate) were employed to promote the cleavage of β-O-4 alcohol to obtain high value chemicals under UV irradiation at room temperature. The Ni/TiO2photocatalyst can be magnetically recovered and efficiently reused in the following four consecutive recycling tests in the cleavage of β-O-4 ether bond in lignin. Mechanism studies suggested that the oxidation of β-O-4 alcohol to β-O-4 ketone by oxidant PCC first occurred during the reaction, and was followed by the photocatalysis of the obtained β-O-4 ketone to corresponding acetophenone and phenol derivates. Furthermore, the system was tested on a variety of lignin model substrates containing β-O-4 linkage for the generation of fragmentation products in good to excellent results.Keywords:lignin;β-O-4;photocatalyst;Ni/TiO2;oxidant PCC
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuejia Liu,Wenqiang Zhao,Xianliang Li,Jiaqiang Liu,Yide Han,Junbiao Wu,Xia Zhang,Yan Xu
Hierarchical α-Fe 2 O 3 microcubes supported on Ni foam (NF) have been successfully prepared using Fe-MOF as a precursor combined with a hydrolysis process, which can be used as the electrodes directly for effective non-enzymatic glucose sensing. The structures and compositions of the as-prepared α-Fe 2 O 3 /NF electrode materials were carefully characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS), respectively. The α-Fe 2 O 3 /NF electrodes exhibit excellent glucose oxidation performance with a response time < 3 s and a sensitivity of 10,356 μA mM −1 cm −2 . Additionally, the material shows good anti-interference sensing performance and stability for glucose detection in the presence of ascorbic acid (AA), dopamine (DA), cysteine (Cys), uric acid (UA), NaCl and other interferences. It is believed that α-Fe 2 O 3 /NF composite can act as a promising electrode material for non-enzymatic glucose sensing applications, and the materials design strategy can be also expanded for other functional systems.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Liutao Huang,Lei Yang,Siwei Guo,Yang Li,Lihua Zhao,Lifang Jiao
Nickel-iron layered double hydroxides (NiFe LDHs) have been identified as one of the best promising electrocatalysts-candidates for oxygen evolution reaction (OER). However, the catalytic activity effected by interlayer water molecules is ignored and rarely reported. Herein, Ni(OH) 2 , NiFe LDHs vertically aligned Ni foam are designed for OER. As a contrast, the corresponding electrocatalysts with the removal of the interlayer water molecules (Ni(OH) 2 -AT, NiFe LDHs-AT) are developed to probe into the influence of the interlayer water molecules towards OER. As expected, NiFe LDH nanoplates exhibit excellent catalytic performance and durability for water electrolysis in alkaline conditions with lower overpotential and smaller Tafel slope compared to those of NiFe LDHs-AT, which are influenced mainly by stability of crystal structure due to the existence of interlayer water molecules. The discovery opens up a similar pathway by controlling the amount of water molecules to boost catalytic performance for studying other electrocatalysts with heteroatom dopant.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Bin Yan,Ji Lan,Yueshan Li,Yinjie Peng,Lingying Shi,Rong Ran
In this paper, hexagonal Ni(OH) 2 nanosheets were prepared by hydrothermal method with nickel chloride hexahydrate as matrix and ammonia as precipitant. The lateral size of Ni(OH) 2 nanosheets was about 100–250 nm. The structure of the Ni(OH) 2 sheets was characterized by XRD , SEM , IR, TGA etc. Pickering emulsion was prepared by using Ni(OH) 2 nanosheets as stabilizer and dichloromethane (DCM) as oil phase. Furthermore, the stability factors of Pickering emulsion and the adsorption of Congo red (CR) on interface particle layer were studied. The adsorption equilibrium of CR was analyzed by Langmuir adsorption model and Freundlich adsorption model, and the adsorption process was researched by pseudo-first-order kinetics and pseudo-second-order kinetics. Compared with Ni(OH) 2 in the water phase, the Ni(OH) 2 in interface particle layer exhibited a much higher adsorption capacity and a faster deposition rate . The adsorption mechanism of CR can be mainly attributed to electrostatic interaction between the positively charged interface particle layer and the anionic CR molecules. It can be expected that as a promising adsorbent for CR removal in water treatment, the Ni(OH) 2 sheets in Pickering interface layer can provide a new strategy for dye adsorption.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8558-8567
·
IF 3.119
Jindong Wang,Wenzhi Li,Huizhen Wang,Ajibola Temitope Ogunbiyi,Xiaomeng Dou,Qiaozhi Ma
To improve the utilization of lignin, much effort has been devoted to lignin depolymerization with the aim to decrease waste and enhance profitability. Here, a dual property (acid and base) catalyst, namely S2O82−–K2O/TiO2, was carefully researched. Upon loading S2O82− and K2O onto TiO2, acid and base sites emerged, and S2O82− and K2O mutually enhanced the acid and base strengths of the catalyst enormously; this indeed facilitated lignin depolymerization. Under appropriate conditions, the yields of liquid product, petroleum ether soluble (PE-soluble) product and total monomer products were 83.76%, 50.4% and 28.96%, respectively. The constituents of the PE-soluble fraction, which are mainly monomers and dimers, can be used as liquid fuels or additives. In addition, after the catalyst was modified by Ni, better results were obtained. Surprisingly, it was found that the Ni enhanced not only the hydrogenation capacity but also the acidity. The highest high heating value (HHV) of the liquid product (33.6 MJ kg−1) was obtained, and the yield of PE-soluble product increased from 50.4 to 56.4%. The product can be utilized as a fuel additive or be converted to bio-fuel. This catalysis system has significant potential in the conversion of lignin to bio-fuel.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）