CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Zijian Li,Zhaohui Yang,Shao Wang,Hongxia Luo,Zhimin Xue,Zhenghui Liu,Tiancheng Mu
Increasing plastic waste is environmentally and biologically detrimental, and converting plastic waste into value-added chemicals and fuels by electrocatalytic methods is recognized as an up-cycling process that facilitates resource utilization. Here, we report a generalized medium entropy metal oxide Ni 0.5 Ce 0.5 Co 2 O 4 induced *OH species targeted transfer strategy to selectively electrocatalytic upgrade various polyester plastics into value-added chemicals under alkaline conditions. Polyethylene terephthalate (PET) was upgraded to potassium diformate with high Faraday efficiency (95 %) and selectivity (>91 %) at a high current density of 343 mA cm −2 , generating both terephthalic acid and hydrogen. The synergistic interplay between Ni and Ce in Ni 0.5 Ce 0.5 Co 2 O 4 facilitates the adsorption of ethylene glycol molecules and hydroxide ions, prompting the directionally oriented hydroxyl (*OH) to partake in the oxidation of ethylene glycol, thereby fostering the oxidation of hydrolyzed PET products. This work not only develops an excellent electrocatalyst for the upcycling of various polyester plastics but also guides the design of medium entropy metal oxides as electrocatalysts.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18818-18824
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IF 3.3
Yaoxia Yang,Xingwei Guo,Mi Kang,Dangxia Wang,Zhiwang Yang
Developing efficient and inexpensive catalysts for the hydrogen evolution reaction (HER) is critical for the commercial viability of electrochemical sustainable energy technologies. In this study, a La-CoP/Co(OH)2 nanoarray supported on nickel foam (NF) was successfully prepared using the secondary hydrothermal and low-temperature phosphating method. The as-prepared La-CoP/Co(OH)2/NF material exhibited excellent hydrogen evolution performance in 1 M KOH solution. The overpotential of La-CoP/Co(OH)2/NF was 114 mV at the current density of 10 mA cm−2, and the Tafel slope was estimated to be 99 mV dec−1. The decoration of Co(OH)2 nanosheets on La-CoP nanorods with the textured surface not only provides a large surface area and more active sites but also promotes the transfer of electrons between Co(OH)2 and La-CoP, which accelerates the reaction rate and further improve the HER performance of the composite material. Additionally, the fabricated catalyst exhibits good stability and durability in alkaline media. This approach provides a feasible and effective strategy for exploring electrocatalysts with high efficiency and low prices for the electrolysis of water.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2023
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IF 2.7
Zhongying Fang,Xiaolong Liang,Lehui Lu,Wei Chen
The electrocatalytic oxidation of urea (EOU) is an important half-reaction in water splitting, urea fuel cells, and urea wastewater treatment. The anions of nickel-based catalysts can be leached severely in the oxidation potential range. Therefore, the influence of anion on the electrocatalytic performance of Ni(OH) 2 /NiOOH for urea oxidation has not been systematically studied. The present experimental results show that the structure reconstruction of catalyst is a complicated process, specifically including deep penetration by alkaline electrolyte, leaching-induced oxidation by phosphorus or sulfur anions, transformation or cracking of the original structure, and formation of an amorphous layer on the surface. The reconstructed NF-NiP x -R or NF-NiS x -R has a three-layer core-shell structure, with a nickel foam skeleton in the innermost layer, an amorphous NiP x or NiS x layer in the middle layer, the outermost layer of oxygen-containing anion (PO x or SO x ) coordinated Ni(OH) 2 . In the prepared catalyst, the Ni(OH) 2 /NiOOH redox is the real catalytic species for the urea oxidation. It is found that the oxygen-containing anion can enhance the catalytic performance of the Ni(OH) 2 /NiOOH redox, and PO x anion has the best enhancing effect. It is found that the urea molecules are oxidized on the electrocatalyst surface mainly through an indirect pathway.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Yanling Li,Jinfu Ma,Shaolin Yang,Lihua Cui,Hui Lu
Material defects play an important role in metal oxide-based or hydroxide-based supercapacitors . Oxygen vacancies as anion vacancy defects can not only offer a high electron conductivity by act as shallow donors but also can adjust the materials’ surface properties. Herein, we synthesis a novel oxygen-vacancy-rich Co(OH) 2 /SnOᵪ/C hybrid nanosheets which are prepared by using a facile one-step hydrothermal route. Possessing special petal-like nanosheets and rich oxygen vacancies, the as-prepared dual ligand hybrid nanosheets (marked Co(OH) 2 /SnOᵪ/C) present a high specific capacitance of 806.36 F g −1 at 1 A g −1 , much higher than single ligand compound (338.36 F g −1 or 450.00 F g −1 ). The solid-state asymmetrical supercapacitors assembled with Co(OH) 2 /SnOᵪ/C show energy density of 49.73 Wh kg −1 with a power density of 1599.98 W kg −1 , and good cycle stability with 64.43% capacitance retention after 20,000 cycles at the current density of 1 A g −1 .
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 16
·10169-10179
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IF 12.732
Fuzhen Zhao,Huicong Liu,Houyu Zhu,Xiaoyu Jiang,Liqun Zhu,Weiping Li,Haining Chen
Amorphous/amorphous heterostructures with a large surface area are theoretically anticipated to promote the alkaline hydrogen evolution reaction (HER) activity and stability. However, the growth, characterization and theoretical simulation of amorphous/amorphous nanostructured heterostructures are still challenging due to their atomic isotropy. Herein, a novel and simple strategy is developed to synthesize amorphous/amorphous Ni–P/Ni(OH)2 heterostructure nanotubes by immersing Zn@Ni–P nanowires grown by axial screw dislocation in alkaline solution. When used as an HER catalyst, the Ni–P/Ni(OH)2 nanotubes achieve considerably high electrocatalytic activity and decent stability. The significantly low overpotential of 54.7 mV at a current density of 10 mA cm−2 is among the best values reported for transition metal phosphides in alkaline solution. Density functional theory calculations indicate that the abundant defect structures of amorphous Ni–P would shift the Ni 3d band center toward the Fermi level, demonstrating an energy barrier decrease for H2 generation. Furthermore, the synergistic effect of amorphous Ni–P and Ni(OH)2 could significantly enhance H2O dissociation to supply sufficient protons for the HER.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Maosheng Chen,Xu Zhang,Chunhua Luo,Ruijuan Qi,Hui Peng,Hechun Lin
Waterborne polymers are advantageous in terms of cost, convenience, sustainability, and environmental friendliness. As lead halide perovskite (LHP) nanocrystals suffer from fast degradation in the presence of water, it is challenging to encapsulate LHP nanocrystals in waterborne polymers. In this work, luminescent MAPbBr3@PbBr(OH) nanocrystals were synthesized via the aqueous grinding process in the presence of 2-methyl-imidazole (2-MIM) and oleylamime (OAm). 2-MIM triggers the formation of the PbBr(OH) matrix, and OAm acts as a size-control ligand to control the size of MAPbBr3@PbBrOH particles in the nanoscale range. Highly stable waterborne luminescent inks were successfully prepared by blending MAPbBr3@PbBr(OH) nanocrystals with waterborne polymers, including poly(vinylpyrrolidone), poly(vinyl acetate), and acrylate resins. Owning to the dual protection of the polymer matrix and PbBr(OH) to LHP quantum dots (QDs), the luminescent films exhibit excellent stability to the environment under thermal and light irradiation. The ink can be used as a phosphor to fabricate down-converting green and white light-emitting diodes (LEDs). Waterborne anticounterfeiting inks suitable for screen printing were prepared via formula tuning for the anticounterfeit purpose. The anticounterfeiting luminescent patterns can be screen printed on paper, cloth, and poly(ethylene terephthalate) (PET), with encryption and decryption of information being accurately and conveniently realized by switching UV irradiation.
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PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 11
·3706-3714
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IF 6.119
Lekai Zheng,Lina Hu,Yongchuan Hu,Fang Liu,Zhiming Liu,Yanming Xue,Jun Zhang,Hui Liu,Chengchun Tang
The development of efficient, stable and low-cost oxygen evolution reaction (OER) catalysts in anodes is essential for the production of hydrogen resources by electrolyzing water. Cobalt hydroxide (α-Co(OH)2) is one of the most encouraging electrocatalysts for the OER under alkaline conditions, but its catalytic activity is still unsatisfactory possibly due to its unfavorable electronic structure. The construction of heterogeneous catalysts has been considered as an effective strategy to change the interface and modulate the electronic structure of electrocatalysts, resulting in improved activities. Herein, novel self-supported α-Co(OH)2 coated Co3O4 nanosheet arrays on conductive carbon cloth have been constructed and fabricated via a simple electrodeposition method (α-Co(OH)2/Co3O4/CC), serving as efficient catalysts for the OER. The as-prepared heterostructure with optimal proportions of α-Co(OH)2 to Co3O4 exhibits an enhanced overpotential of 275 mV at 10 mA cm−2 (322 mV for α-Co(OH)2/CC and 359 mV for Co3O4/CC), a low Tafel slope of 76 mV dec−1 and excellent durability for 22 h. The further electrochemical results show that the formation of heterostructure can optimize the electronic structure of the catalysts through interfacial coupling effect, improve the charge transfer ability and increase the electrochemical active sites, all of which are beneficial to the OER performance enhancement. This work not only develops a highly efficient and stable non-precious metal catalyst toward the OER, but also opens up new ways for boosting the performance by regulating the electronic structure through interface engineering of electrocatalysts and beyond.
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Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Yi Cheng,Jilin Zhang
Excessive phosphate in wastewater can cause eutrophication of water body, which will worsen the ecological environment and threaten human health and biological life safety. Adsorption of phosphate is the most effective way to remove phosphate, and efficient adsorbent is the key. Amorphous La(OH) 3 has been deemed as a potential phosphate adsorbent on account of high adsorption capacity and environmentally friendly property. However, it also shows some disadvantages such as easy agglomeration, poor water dispersion. In this study, UiO-66-NH 2 was used as carrier to load amorphous lanthanum hydroxide as an adsorbent for phosphate removal. The adsorbent (UiO-66-NH 2 @La(OH) 3 , ULCs) has good water dispersibility and it is easy to be separated and recovered. At the same time, the maximum phosphate adsorption capacity can reach 140.7 mg P/g. The adsorption process accords with pseudo second order kinetic model and Freundlich isotherm model. The thermodynamic results showed that the adsorption process was spontaneous and endothermic. In addition, in the presence of coexisting anions (such as Cl − , SO 4 2− , NO 3 − ), it also exhibited high selectivity and phosphate removal efficiency. Meanwhile, the adsorption capacity keeps at a high level in the range of pH 3–11. By the merit of above-mentioned properties, the prepared material is expected to be an ideal candidate for phosphate removal from contaminated water.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
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2020
·Vol. 50
·期 11
·1091-1099
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IF 2.384
Fa Dejuan,Miao Yuqing
Abstract The NiHPO 4 –Ni(OH) 2 nanowire-assembled bouquets were easily synthesized. Scanning electron microscopy and transmission electron microscopy show the NiHPO 4 –Ni(OH) 2 bouquets form through the organization of nanowires which arrange with certain direction. The electrocatalytic activities of NiHPO 4 –Ni(OH) 2 –GCE towards the oxidation of methanol and urea were studied in NaOH. The nanowire-assembled bouquets were modified on the surface of the glassy carbon electrode, leading to the increase on the surface area of the electrode, which in turn enhanced the current density and electrocatalytic performance for the oxidation of methanol and urea. It shows the potential applications for the utilization of these energy molecules. Graphic abstract
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Huanhuan Li,Mingyang Tan,Can Huang,Weiping Luo,Shuang-Feng Yin,Weijun Yang
Functional nanosheets have attracted great attention due to their potential applications in catalysis chemistry and material science. Herein, Co 3 O 4 nanoparticles interconnecting with nitrogen-doped carbon architectures (denoted as Co 3 O 4 /NC) was developed on nickel foam surface by a two-step solvothermal process and followed by calcination. A metal organic framework (MOF) of laminar CoMOF-NH 2 was synthesized firstly by in-situ transformation of Co 2 (OH) 3 Cl array. Then, porous Co 3 O 4 /NC nanosheets were obtained by controlled heat treatment of CoMOF-NH 2 . The Co 3 O 4 /NC supported by nickel foam can be directly used as self-supported electrodes for electrocatalysis without any binders. As-synthesized Co 3 O 4 /NC acts as effective catalysis for oxygen evolution reaction (OER). Interestingly, the optimized electrochemical efficiency for OER was achieved by Co 3 O 4 /NC nanosheet with overpotentials of 235 mV and 264 mV offering current densities of 10 mA/cm 2 and 100 mA/cm 2 , respectively. It also has a relatively low Tafel slope, which indicates the fast electron transfer kinetics of the catalyst. So Co 3 O 4 /NC nanosheet has great potential in replacing precious metal electrocatalysts in OER application.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 97
·期 1
·1-4
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IF 2.008
Chen Wenming,Wang Haibo,Guo Xuan,Zhong Jinyi
Self-detoxifying materials for capturing and destructing chemical warfare agents (CWAs) have attracted intense attention in efficient personal protection and safe handling of contaminated materials. In this study, we reported an approach for synthesis of flexible Zr(OH) 4 -carbon fiber composite by sol–gel method. Activated carbon fibers serving as substrate carrier and adsorption conveyor could effectively make Zr(OH) 4 evenly distributed on the surface, which has excellent sorption properties and wide-ranging reactivity toward CWAs. The results demonstrated that the Zr(OH) 4 -carbon fiber composite could quickly remove (within 10 s) and 6-h degradation efficiency to 10-mg/mL sulfur mustard (HD) and O-ethyl S-(2-diisopropylamino)-ethyl methylphosphonothioate (VX) could reach 92.2 and 99.99%. In addition, it was found that Zr(OH) 4 -carbon fiber composite remained intact after adsorption, which could recollect resources and avoid Zr(OH) 4 leakage into waters. Therefore, the designed Zr(OH) 4 -carbon fiber composite will be a good potential application in precision equipment or skin decontamination equipment.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 10
·104501
·
IF 3.721
Shengliang Wei,Yuqing Miao
The Mn-doped Ni(OH)2 nanostructures were obtained by a simple ion-exchange hydrothermal method. The as-prepared materials were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDXS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) for their morphological, composition and structural properties. As a material for modified electrodes, electrochemical tests demonstrate that the methanol oxidation peak current density of Mn-doped Ni(OH)2 nanostructures reached 14.18 mA cm−2 at 0.596 V (vs Ag/AgCl) in NaOH electrolyte. Similarly, the Mn-doped Ni(OH)2 nanostructures also maintained good electrocatalytic stability during the term of 36,000 s. The improvement of electrochemical performance is related to the introduction of Mn element in Ni(OH)2. It may promote Ni in the Mn-doped Ni(OH)2 nanostructures to carry the lower electron density and the higher oxidation state which may be responsible for the better performance toward methanol oxidation.
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