RSC Advances
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2020
·Vol. 10
·期 14
·8558-8567
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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.
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Journal of Energy Chemistry
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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 .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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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.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 36
·15396-15402
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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.
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Journal of Energy Chemistry
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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.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Mingxuan Fu,Qi Zhang,Yuena Sun,Guyang Ning,Xinyu Fan,Haiyang Wang,Haijun Lu,Yufan Zhang,Huan Wang
Electrochemical water-splitting is widely regarded as one of the essential strategies to produce hydrogen energy, while Metal-organic frameworks (MOFs) materials are used to prepare electrochemical catalysts because of its controllable morphology and low cost. Herein, a series of trimetallic porous Pt-inlaid Ni–Fe nanocubes (NCs) are developed with bifunctions of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In the process of prepare the electrochemical catalysts, Pt nanoparticles are uniformly embedded in the Fe–Ni PBA cube structure, and ascorbic acid is employed as a reducing agent to reduce Pt 2+ to Pt nanoparticles. In this work, the cubic structure of Fe–Ni PBA is maintained and the noble metal Pt nanoparticles are embedded. Remarkably, the formation of PBA cubes, Pt inlay and reduction are completed in one step, and Pt nanoparticles are embedded by a simple method for the first time. By employing acid etching method, a porous structure is formed on the PBA cube, which increases the exposed area of the catalyst and provides more active sites for HER and OER. Due to the porous structure, highly electrochemical active surface area and the embedded of highly dispersed Pt nanoparticles, the porous 0.6 Ni–Fe–Pt nanocubes (NCs) exhibits excellently electrocatalytic performance and durable stability to HER and OER. In this work, for HER and OER, the Tafel slopes are 81 and 65 mV dec −1 , the overpotential η at the current density of 10 mA cm −2 are 463 and 333 mV, and the onset potential are 0.444 and 1.548 V, respectively. And after a 12-h i-t test and 1000 cycles of cyclic voltammetry (CV), it maintained high stability and durability. This work opens up a new preparation method for noble metal embedded MOF materials and provided a new idea for the preparation of carbon nanocomposites based on MOF.
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ACS Applied Materials & Interfaces
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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.
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MOLECULES
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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
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Jinjie Lin,Ce Gao,Xianhong Wu,Nan Wu,Run-Cang Sun
Abstract The electrocatalytic nitrate reduction reaction (NO3–RR) provides a sustainable and carbon-efficient strategy for ammonia (NH3) production, a vital industrial feedstock. However, the development of efficient electrocatalysts remains a significant bottleneck hindering its practical advancement. In alkaline media, effective electrocatalysts should not only activate nitrate but also promote water dissociation to supply proton equivalents for ammonia formation. Herein, we report the innovative application of sodium alginate (SA) hydrogels as a monolithic electrode for NO3–RR. The Fe3+ and Ni2+ ions coordinate with the carboxyl and hydroxyl groups in the sodium alginate to form a stable 3D porous network structure (FeNi/SA). In this structure, Ni sites promote water dissociation, whereas Fe sites facilitate nitrate reduction; the cooperation between these dual active sites accelerates ammonia formation. Consequently, the FeNi/SA hydrogel exhibits exceptional electrocatalytic performance, requiring potentials of only 0.0579 and –0.34 V (vs RHE) to achieve current densities of –10 and –100 mA cm–2, respectively. Notably, it delivers a high ammonia yield rate of 7.745 mg h–1 cm–2 with an impressive Faradaic efficiency of 93.79%. Experiment and density functional theory calculations results indicate that Ni sites promote the generation of *H and modulate the electronic structure of Fe, lowering the energy barrier for the critical *NO to *NOH transition and accelerating NH3 formation. Furthermore, integrating the NO3–RR process with an air-stripping system enables the efficient recovery of NH4Cl, offering a viable pathway for converting nitrogenous waste into high-value products. This work highlights the potential of hydrogel-based materials as a new frontier for robust nitrate-to-ammonia conversion.
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JOURNAL OF POWER SOURCES
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2026
·
IF 8.4
Qian-Yu Wang,Sian-Hong Ong,Zi-Ye Liu,Zhong-Wei Zhang,Quan-De Li,Ji-Ming Hu
Conductive graphene nanosheets boost oxygen evolution electrocatalysis. • Electrochemically assisted deposition forms porous Ni(OH) 2 /NiO onto freestanding graphene. • Low overpotential of 260 mV at 10 mA cm −2 and Tafel slope of 41 mV dec −1 . • Macroscopic model indicates faster *OOH formation with transfer coefficient of 0.74 Developing low-cost oxygen evolution reaction (OER) catalysts with efficient charge transport and accessible active sites is essential for alkaline water electrolysis. Here we report an electrochemically assisted technique (EAT) to deposit highly dispersed Ni(OH) 2 species on the surface of freestanding graphene (Gr) without deliberate surface functionalization, where a transient SiO 2 -derived framework assists the deposition process of Ni(OH) 2 , followed by heat treatment and alkaline etching to form an intimately contacted Gr@eNi(OH) 2 -NiO composite. On one hand, Gr enables the highly dispersed distribution of Ni(OH) 2 /NiO species and improves the accessibility of active sites for the OER. On the other hand, Gr provides good electrical conductivity and rapid charge-transfer kinetic, leading to high catalytic activity. In 1 M KOH, Gr@eNi(OH) 2 -NiO delivers an overpotential of 260 mV at 10 mA cm −2 and Tafel slope of 41 mV dec −1 , together with stable operation in alkaline electrolyte. Macroscopic kinetics analysis based on current-overpotential fitting further suggests an enhanced potential response of the *OOH-forming step, consistent with improved OER kinetics enabled by Gr-deposit coupling. This work provides a practical route to integrate Ni hydroxide/oxide phases with Gr scaffolds for efficient alkaline water oxidation. Download: Download high-res image (334KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yujing Nie,Yijiang Li,Junwei Li,Leniu Chen,Xudong Wang,Tao Chen,Zhixiong Cai
Metal-organic frameworks (MOFs) exhibit structural diversity and functional tunability, rendering them a versatile platform for a wide range of applications. Specifically, defects or function groups induced by exotic ligands is an efficient strategy to adjust the catalytic performance. In this study, we explore the impact of incorporating ferrocene derivatives into two Ni-based MOFs and examine their suitability as potential glucose sensors. One strategy involves introducing bidentate 1,1′-ferrocenedicarboxylic acid (1,1′-Fc) into the 3D Ni-1,4-benzenedicarboxylic acid MOF (Fc-Ni-BDC) using a simple single-step hydrothermal method . Another approach involves encapsulating ferrocenemethylamine (Fc-NH 2 ) inside the cavity of 2D conductive Ni-HHTP MOF (HHTP=2,3,6,7,10,11-hexahydroxytriphenylene) driven by electrostatic attraction to form Fc-Ni-HHTP. On account of the synergy between ferrocene derivatives and MOFs, the hybrid MOFs demonstrated remarkable electrochemical performance , characterized by pronounced electrocatalytic reactivity towards glucose oxidation . It is showed that the doped ferrocene derivatives act as electron donors to the MOF active sites, modifying the electronic structure and facilitating the kinetics of the reactions, then an augmentation in the catalytic efficiency has been achieved. This work demonstrates a simple strategy to improve MOF-based electrochemical sensors by incorporating metallocene ligands.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Zhecheng Fang,Haoan Fan,Xuezhi Zhao,Gaobo Lin,Bolong Li,Jianghao Wang,Xiuyang Lu,Wulong Yang,Mian Li,Weiyu Song,Jie Fu
Glucose hydrogenation to sorbitol is a vital industrial reaction for the utilization of biomass. Generally, hydrogenation is catalyzed by the inexpensive Raney Ni catalyst which has good catalytic but suffers from poor stability and side reaction，and the mechanisms of glucose hydrogenation on Raney Ni surfaces is also unclear. This study combines density functional theory calculations, ab initio molecular dynamics simulations (AIMD), and experiments to reveal the nature of glucose hydrogenation on the (111), (200), and (220) surfaces of Ni catalyst. The DFT calculation results show that the (111) and (200) surfaces of Raney Ni are favorable for hydrogenation with 111-η2, 200-η2–1, 200-η2–3 adsorption configurations and adsorption energy is closely related to the rate-determining step. Furthermore, in-situ IR analysis and AIMD calculation confirm the existence of 111-η2 structure in hydrogenation, while electronic analysis demonstrates that improving the alignment of the nickel surface's d orbitals with the -C O bond's π orbitals can enhance both the adsorption and catalytic hydrogenation activity. In addition, the (220) surface is found to be responsible for the dehydrogenation of cyclic-glucose, and decreasing the percentage of the (220) surface and increasing the reaction temperature appropriately may be effective in inhibiting the side reaction. This paper not only reveals the nature of Raney Ni catalyzed glucose hydrogenation but also lights the direction for the design of highly efficient nickel-based catalysts.
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危险品化学品经营许可证（带存储）