ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yu Yin,Chunhui Ma,Wei Li,Sha Luo,Zhanshuo Zhang,Shouxin Liu
Facilitated isomerization of cellulose hydrolysis intermediate glucose without unexpected byproducts, which is the rate-determining step in the production of high-value-added biofuels, enables the efficient production of 5-hydroxymethylfurfural (5-HMF) from cellulose. In this work, considering the essential role of the acidity control and shape selectivity of a zeolite catalyst, a NiO-loaded mesoporous NiO/poly(vinyl pyrrolidone) (PVP)-phosphotungstic acid (HPA)@SBA-15 nanoreactor was prepared. This SBA-15 nanoreactor with a pore size of 5.47 nm reduced the concentration of byproducts formic acid (FA) and levulinic acid (LA) through shape selection for intermediates. Well-defined NiO nanoparticles (Ni-to-carrier mass ratio was 1:1) provided the NiO/PVP-HPA@SBA-15 nanoreactor a high Lewis acidity of 99.29 μmol g–1 for glucose catalytic isomerization, resulting in an increase in total reducing sugar (TRS) yield by 5 times. Such a nanoreactor remarkably improved the reaction efficiency of 5-HMF production from cellulose (a 5-HMF selectivity of 95.81%) in the 1-butyl-3-methylimidazolium chloride ([BMIM]Cl)/valerolactone (GVL) biphasic system.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lu-Lu Zhou,Peng-Xi Liu,Ying Ding,Jia-Rui Xi,Li-Juan Liu,Wei-Kang Wang,Juan Xu
Heterogeneous catalysts with hierarchically porous structure are highly efficient to catalyze chemical reactions. In this work, two-dimensional (2D) nano-flakes assembled flower-like NiO is fabricated and utilized for activating peroxydisulfate (PDS) to degrade organic pollutants bisphenol A (BPA). The results demonstrate that the prepared catalyst exhibits well organized flower structure composed of uniform 2D nano-flakes. PDS combines with the catalyst to form surface-activated NiO-PDS complex, subsequently depriving electrons from BPA. For the optimized NiO-12 catalyst, large specific surface area and hierarchically porous structure benefit to exposes abundant active sites while low resistance promotes electrons transfer, bringing the high BPA degradation rate constant of 0.28 min −1 under the condition of 20 mg/L initial concentration. NiO-12 exerts a capability of catalyzing PDS to mineralize 34% of practical packaging wastewater. This study provides a new strategy to fabricate hierarchical 2D porous catalysts for persulfate activation, with application potential in practical wastewater treatment.
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Nanoscale
·
2023
·Vol. 15
·期 48
·19784-19791
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IF 6.7
Xu Yang,Mengxue Liu,Fang Cui,Qinghai Ma,Tieyu Cui
Research on Ni/NiO electrocatalysts has advanced significantly, but the main obstacles to their use and commercialization remain their relatively ordinary activity and stability. In this paper, a chelating structure based on the coordination of multidentate ligands and Ni(II) is proposed to limit the growth of Ni and Ni oxide grains. These features reduce the particle size of Ni/NiO, increase particle dispersion, and maintain the high activity and stability of the catalyst. Aspartic acid, as a polydentate ligand, could coordinate with Ni2+ to form structurally stable chelate rings. The latter can limit grain growth, but also coat the active core with thin carbon layers after calcination to further achieve the confinement and protection of nanoparticles. The hydrogen evolution overpotential of prepared nitrogen-doped graphitized carbon shells (Ni/NiO@NC) nanoparticles was 100 mV (vs. RHE) when the current density was 10 mA cm−2 in 1 M KOH. The hydrogen evolution overpotential increased by only 4 mV after 6000 continuous cyclic-voltammetry scans. Moreover, when coated on different conductive substrates, the overpotential of this catalyst dropped to 34.6 mV (vs. RHE) at a current density of 10 mV cm−2. The lowest overpotential of the composite was only 194.9 mV at a current density of 100 mA cm−2, which is comparable with that of noble metal-based electrocatalysts. This work provides a plausible method for designing high-performance electrocatalysts of small size.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huan Xu,Dan Zhang,Minmin Liu,Daixin Ye,Shengjuan Huo,Wei Chen,Jiujun Zhang
Designing cost-effective and robust bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly desired in hydrogen production from overall water splitting, but still suffers great challenges due to the sluggish catalytic OER/HER kinetics. In this paper, a surface/defect engineering strategy is developed to synthesize three-dimensional (3D) carbon foam (CF)-supported unique hierarchical Co 3 O 4 nanowires@NiO nanosheets core–shell nanostructured catalyst (NiO@Co 3 O 4 /CF) with rich oxygen-vacancies as a novel bifunctional catalyst for alkaline water splitting electrolysis. Benefited from the synergy of the 3D hierarchical core–shell structure and rich oxygen vacancies , the as-obtained NiO@Co 3 O 4 /CF shows both excellent OER ( η 200 = 325 mV, η 500 = 374 mV) and HER ( η 10 = 104 mV) activities with low Tafel slopes (64.26 mV dec −1 for OER and 109.14 mV dec −1 for HER, respectively) and outstanding stability. A simple overall water splitting electrolysis cell assembled by this bifunctional NiO@Co 3 O 4 /CF as both OER and HER catalysts requires only a cell voltage of 1.53 V to obtain the current density of 10 mA cm −2 and displays a long-term stability. This work has successfully developed an approach for rational design and novel synthesis of metal oxide hybrids as bifunctional electrocatalysts with high activity and stability for overall water splitting.
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Materials Advances
·
2021
·Vol. 2
·期 14
·4667-4676
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IF 0
Qi Zhao,Jinkai Wang,Yuanyuan Cui,Xinghui Ai,Zhang Chen,Chuanxiang Cao,Feng Xu,Yanfeng Gao
Developing a highly stable electrode has been a research focus for electrochromic smart windows (ECSWs) with an ultralong cycling life. This paper reports a NiO/Ni counter electrode and the discovery of conductive ionic bonds at the NiO/Ni interface. The formation of these conductive ionic bonds between NiO and Ni is verified by electron localization function (ELF) and Bader charge analyses. Furthermore, the density of states (DOS) results reveal the metallic character of these ionic bonds. Such conductive ionic bonds stabilize the NiO lattice in the process of ion intercalation/deintercalation and weaken the electrostatic interaction between Ni and O. The experimental results show that the NiO/Ni electrode shows high visible transparency in the bleached state (90.1%), a fast switching speed (4.5 s for coloring and 5 s for bleaching) and an ultralong cycling life (87.0% retention of the original optical contrast at 550 nm after 10 000 cycles). Additionally, a 10 cm × 10 cm ECSW assembled with this NiO/Ni counter electrode and a WO3 electrode shows excellent EC performances such as large optical contrast (67.1%@550 nm, −2 V), very small transparency (lower than 1% in the wavelength range of 1600–800 nm), and a high coloration efficiency of 175.7 cm2 C−1. This work on an all-solution preparation of NiO/Ni counter electrodes represents an important step toward the development of cheap ECSWs.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Shanshan Qiao,Chao Feng,Yuan Guo,Tingxiang Chen,Naeem Akram,Yi Zhang,Wei Wang,Fan Yue,Jide Wang
The exploration of bifunctional catalysts to produce both hydrogen and oxygen will accelerate the progress of overall water-splitting. This paper introduces a facile method to fabricate bifunctional photocatalysts toward the water splitting by doping nano CdS with S vacancies on Ni@NiO nano-spheres. A serious of photocatalytic catalysts were developed and subsequently characterized, the two half-reactions of photocatalytic water splitting were studied in detail by using sacrificial agents, the hydrogen output at 41699 μmol g −1 h −1 (AQE 28.5%, λ = 420 nm) while the evolution of O 2 is as high as 55120 μmol g −1 h −1 (AQE 35.7%, λ = 450 nm). It is a strategy that the presence of Ni@NiO can trigger the S vacancy in CdS to act as an effective electron trap, the p-n junction of NiO-CdS, as well as the Schottky barrier between NiO and Ni, can change the dynamic characteristics of photogenerated electrons and prolong their life. These prolonged photogenerated electrons can initiate stable and effective photocatalytic redox reactions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yingzhen Zhang,Jingchuang Zhao,Xianyu Kang,Guoliang Chen,Yancai Li
Currently, Substituting methanol oxidation reaction with a low theoretical potential for water oxidation reaction is one of the hotspots in the study of water splitting to hydrogen production . In this work, N-C/NiO nanocomposites with different morphologies were synthesized by one-pot hydrothermal method . Interestingly, the tremella-like N-C/NiO nanocomposites turned into looser flower-like structure at the existence of N-C-SiO 2 nanosheets supporting in the hydrothermal process. Meanwhile, the silica in the N-C-SiO 2 nanosheets was removed by urea in hydrothermal reaction. The introduction of the N-C-SiO 2 nanosheets has a vital influence to enhance the electrochemical performance of the N-C/NiO nanocomposites. The flower-like N-C/NiO nanocomposites exhibit large electrochemically active surface area and superior electrocatalytic performance for methanol oxidation reaction (MOR) in alkalic electrolyte. It displays excellent electrocatalytic activity with a highly mass activity (3298 mA mg −1 ) and long-time stability (remain 50% after 36,000 s) toward MOR, which are 35.0 and 2.9 folds higher than that of the commercial 10%-Pt/C, respectively.
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ChemSusChem
·
2019
·Vol. 12
·期 12
·2773-2779
·
IF 7.804
Haofei Wu,Kai Yin,Weihong Qi,Xinfeng Zhou,Jieting He,Jinming Li,Yanyu Liu,Jun He,Shen Gong,Yejun Li
Graphical Quick and easy ! A hierarchical binder-free Ni/NiO@CoFe LDH nanostructure was prepared by laser ablation and electrodeposition in several minutes. The material displayed efficient electrocatalytic performance for the hydrogen evolution reaction and oxygen evolution reaction in alkaline solution. The catalyst also exhibited excellent activity and stability for overall water splitting under alkaline conditions. The development of simple and effective methods for the rapid preparation of electrocatalysts for overall water splitting from earth-abundant elements is an important and challenging task. A facile and ultrafast two-step method was developed to prepare a Ni/NiO@CoFe layered double hydroxide hierarchical nanostructure (NCF) within a few minutes by femtosecond laser ablation and electrodeposition. In 1 m KOH solution, the optimized NCF catalysts show a low overpotential of 230 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm −2 with a low Tafel slope of 34.3 mV dec −1 , indicating fast and efficient OER kinetics. Owing to the synergistic effect between NiO and CoFe layered double hydroxide, the hydrogen evolution reaction performance of the NCF was also improved. The synthesized electrocatalysts were further utilized in overall water splitting with a potential of only 1.56 V at a current density of 10 mA cm −2 and excellent durability, better than that of the commercial RuO 2 (+)//Pt/C(−) system. The present work provides new insights on the rapid and facile preparation of efficient electrocatalysts for overall water splitting on a large scale.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 1
·1-9
·
IF 6.232
Duo Huixiao,Li Yijing,Liang Xiaojing,Wang Shuai,Wang Licheng,Guo Yong
Magnetic hierarchical nickel/nickel oxide/carbon nanorods (Ni/NiO@C) were prepared via the pyrolysis of a metal-organic framework containing nickel(II) nickel (Ni-MOF; Ni 3 (BTC) 2 ) under argon atmosphere. In this material, magnetic Ni/NiO@C nanoparticles are embedded in porous carbon nanorods, and the morphology is similar to that of the original Ni-MOF precursor. The synthesized nanorods were applied as magnetic sorbents in the solid-phase extraction of five benzoylurea insecticides (flufenoxuron, chlorbenzuron, teflubenzuron, diflubenzuron and triflumuron), and their performance was evaluated under optimized conditions. The results show that the material exhibits high extraction recoveries from spiked samples (82.9%–107.6%) and linear response in the range of 0.2–450 μg·L −1 . It is also characterized by relatively low limits of detection (50–100 ng·mL −1 ) at a signal-to-noise ratio of 3. The sorbent is chemically stable and can be repeatedly recycled, with little decline in extraction capacity after 20 cycles of reuse. The method was successfully applied to the quantification of benzoylureas in tea, wolfberry, millet, and oat samples, and it showed high extraction efficiency.
Schematic representation of the synthesis of magnetic hierarchical nickel/nickel oxide/carbon nanorods derived from Ni-MOF. The material is employed as a sorbent for the magnetic solid-phase extraction of benzoylurea insecticides.
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高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Bingdi Liu,Liqiang Luo,Yaping Ding,Xiaojing Si,Youli Wei,Xiaoqian Ouyang,Duo Xu
This paper demonstrated an electrochemical sensor based on NiO nanoparticles-graphene composite film (NiO/GR) modified glassy carbon electrode for detecting ascorbic acid (AA) in the presence of folic acid using differential pulse voltammetry . The obtained NiO/GR nanocomposite was fabricated by electro-deposition technology. The morphologies and interface properties of NiO/GR composite film were examined by scanning electron microscopy, energy dispersive X-ray spectroscopy and electrochemical impedance spectroscopy . The modified electrode exhibits excellent sensing performance for detecting AA with linear range from 0.05 to 1100 μM and a detection limit of 0.0167 μM (S/N = 3). Under optimal conditions, the sensor displays excellent stability and satisfactory results in real samples analysis.
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Desalination and Water Treatment
·
2024
·
IF 1
Dezhi Qin,Wenhui Hu,Li Zhang
The Fe 3 O 4 /NiO magnetic nanomaterials were prepared by microwave-assisted and hydrothermal synthesis in β-cyclodextrin (β-CD) solution, which can be employed as absorbents and photocatalysts for the degradation of Congo red (CR). The XRD, EDX and TEM characterizations were used to determine the structure, composition and morphology of the as-prepared samples. The interaction between Fe 3 O 4 /NiO nanoparticles and β-CD molecules was investigated by TGA and FT-IR spectra. The results indicate that β-CD molecules can encapsulate the as-prepared nanoparticles and control the nucleation and growth of Fe 3 O 4 /NiO nanocrystals to certain extent. The pyrolysis of β-CD molecules and calcination treatment produced porous structure that provides more adsorption sites for CR molecules. The effect of reaction factors including calcination temperature and pH values was studied to determine the optimum condition. In addition, the thermodynamic and kinetic parameters of CR absorbed on Fe 3 O 4 /NiO nanoparticles were measured to understand the adsorption mechanism. The high removal efficiency for CR in aqueous solution was achieved within 60 min of adsorption and 40 min of UV-light irradiation, which can be attributed to the synergistic effect of the adsorption–photodegradation process. The prepared Fe 3 O 4 /NiO nanocrystals exhibit high adsorption capacity, magnetic separability, good photocatalytic activity and renewability, making it a potential material for wastewater treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jiaxin Li,Yan Lv,Xueyan Wu,Rui Xue,Zhuojun Yang,Jixi Guo,Dianzeng Jia
Discovering a valid approach to achieve a novel and efficient water splitting catalyst is essential for the development of hydrogen energy technology. Herein, unique hollow-structured ruthenium (Ru)-doped nickel–cobalt oxide (Ru-NiO/Co 3 O 4 /NF) nanocube arrays are fabricated as high-efficiency bifunctional electrocatalysts for hydrogen evolution reaction (HER)/urea oxidation reaction (UOR) through combined electronic and vacancy engineering. The structural characterization and experimental results indicate that the doping of Ru can not only effectively modulate the electronic structure of Ru-NiO/Co 3 O 4 /NF, but also increase the content of oxygen vacancies in the structure of Ru-NiO/Co 3 O 4 /NF to stabilize the existence of oxygen vacancies during the catalytic process. This can optimize the adsorption and desorption of the reactive intermediates on the surface of Ru-NiO/Co 3 O 4 /NF and dramatically accelerate the HER and UOR kinetics. As a result, the Ru-NiO/Co 3 O 4 /NF hollow structure nanocube arrays exhibit overpotentials of 21 and 60 mV for HER, as well as potentials of 1.36 and 1.42 V for UOR at 10 and 100 mA cm −2 , respectively. Furthermore, the coupled HER and UOR system requires only 1.59 V of cell voltage to drive a current density of 100 mA cm −2 , which is approximately 240 mV lower than conventional water electrolysis. This work provides a tremendous promise for the development of novel and high-activity electrocatalysts in future energy conversion applications.
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