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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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 6
·066515
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IF 3.721
Wenjing Liu,Zhiyuan Wu,Pei Dong,Feifei Lin,Meng Zang,Shuai Qiao,Yingying Gu,Jinqiang Zhang,Shuaijun Wang,Chaocheng Zhao
Developing effective and economical materials for emerging electrochemical remediation of persistent organic pollutants has attracted significant research interest. In this study, a heteromorphic self-standing nickel foam@Ni(OH)2/MnO2 (NF@Ni(OH)2/MnO2) electrode was synthesized by a simple solvothermal method and employed for the remediation of persistent organic pollutants. The prepared NF@Ni(OH)2/MnO2 electrode exhibited better performance for the electro-catalytic degradation of tetracycline (TC) than that of the NF and NF@Ni(OH)2. In optimized conditions, the NF@Ni(OH)2/MnO2 electrode exhibited the highest TC degradation efficiency (90%) and total organic carbon(TOC) removal (59.02%) among the prepared electrodes. In addition, a higher mineralization current efficiency (MCE) and lower energy consumption (EC) for the NF@Ni(OH)2/MnO2 electrode was achieved. The enhancement occurs primarily because the active MnO2 anchored to the porous and highly conductive Ni foam substrate surface boosts the electron transfer and the generation of hydroxyl radicals, as proved by a free radical trapping experiment and fluorescence spectrum analysis. This study suggests the possibility of a new paradigm in designing effective and practical electro-Fenton electrodes for environmental remediation.
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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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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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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2023
·
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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Inorganics
·
2023
·Vol. 11
·期 6
·236
·
IF 2.9
Jia-Lin Cui,Zhong-Liang Liu,Hui-Hui Li,Chun-Zhong Li
The synthesis of highly efficient heterogeneous catalysts with uniformly dispersed noble metal particles and a suitable size is crucial for various industrial applications. However, the high cost and rarity of noble metals limit their economic efficiency, making it essential to improve the catalytic performance with lower noble metal loading. Herein, a two-step method was developed for the synthesis of uniformly dispersed ~3 nm Pt nanoparticles (NPs), strongly anchored on Ni(OH)2nanosheets (NSs), which was proven by adequate structural characterizations. XPS analysis demonstrated that Ni(OH)2NSs with abundant oxygen vacancies provided sufficient anchor sites for Pt NPs and prevented their agglomeration. The catalytic performance of Ptn/Ni(OH)2(n (represents the addition amount of Pt precursors during the synthesis, μmol) = 5, 10, 15, and 20) NSs with controllable Pt loading were evaluated via the reduction of 4-nitrophenol to 4-aminophenol as a model reaction. The Pt10/Ni(OH)2NSs exhibited the best activity and stability, with a reaction rate constant of 0.02358 s−1and negligible deterioration in ten reaction cycles. This novel synthetic method shows potentials for the synthesis of highly efficient noble-metal-supported catalysts for heterogeneous catalysis.Keywords:Pt/Ni(OH)2nanosheets;oxygen vacancy;heterogeneous catalysis;reduction of 4-nitrophenol
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Li Zheng,Chao-Rui Zhang,Dan Zhao,Xuan Wanga,Ting-Ting Du
A β-Ni(OH) 2 flakes modified carbon paste electrode [Ni(OH) 2 /CPE] has fabricated for hydrazine sensing. The β-Ni(OH) 2 flakes derived from nickel hexacyanoferrate (NiHCF) through a facile in situ electrochemical method and characterized by Fourier transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and linear sweep voltammetry. Owing to the large active surface area and enhanced electron transfer efficiency of β-Ni(OH) 2 flakes, the Ni(OH) 2 /CPE showed enhanced catalytic activity toward the oxidation of hydrazine compared with NiHCF/CPE and unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.1 ~ 600 μM with the detection limit of 0.04 μM. Furthermore, the sensor has applied for the determination of hydrazine in water samples.
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Micro & Nano Letters
·
2019
·Vol. 14
·期 7
·749-752
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IF 0.975
Li Hong Qian,Xiao Cai Liang,Hua lan Zhou
The Ni(OH) 2 /NiOOH nanoparticles (NPs) electrodeposited on a glassy carbon electrode (GCE) in Ni(NO 3 ) 2 and NH 3 ·H 2 O aqueous solution for the electrode materials. Then the nickel hydroxide/oxyhydroxide acetate was formed in acetate solution. The effects of deposition conditions such as the concentration of Ni(NO 3 ) 2 solution, the number of sedimentary cycles, the concentration of acetate in the soaking liquid and the soaking time are discussed in detail. The electrochemical properties of the material have been investigated by cyclic voltammetry, Tafel curve, EIS and amperometric i–t curve techniques. The result displays excellent electrocatalytic activity towards the electrocatalytic oxidation of urea in alkaline solution. Furthermore, the modified electrode for oxidation reaction has the advantages of simple preparation, good electrochemical properties and stabilisation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Jing Li,Huilian Hao,Jianjun Wang,Wenyao Li,Wenzhong Shen
Nitrogen-enriched graphene coupled with nickel hydroxide nanosheets (Ni(OH) 2 /NG) hydrogel is successfully synthesized through a facile one-pot hydrothermal method . Comprehensive investigations reveal that the nitrogen atoms are successfully inserted into graphene and that the nickel hydroxide nanosheets (∼30–50 nm) are anchored on NG homogeneously. With the enhanced electroactivity caused by nitrogen doping and the synergy effect from Ni(OH) 2 nanosheets and NG, the Ni(OH) 2 /NG hydrogel electrode displays much better electrochemical properties than two individual electrodes. It features a specific capacitance as high as 896 F g −1 at 0.5 A g −1 and even 504 F g −1 at 12 A g −1 showing a high rate capability (56.3% retention with 24 times higher current density). An asymmetric supercapacitor device on the basic of Ni(OH) 2 /NG hydrogel and activated carbon (AC) was assembled and delivered a high energy density of 28.7 W h kg −1 at the power energy density of 0.36 kW kg −1 . Such results indicate that the Ni(OH) 2 /NG hydrogel could be considered as a promising candidate for electrochemical supercapacitors .
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MATERIALS TECHNOLOGY
·
2019
·
IF 1.82
Xinyu Jiang,Wenbo Cheng,Huijie Hu,Yiming Hu,Yunpeng Cao,Shengnan Yan,Ruixin Di,Xiaoze Wang,Li Hou
As an excellent electrode material for supercapacitors, it should have high capacitance like transition metal oxides and good stability like carbon materials. In this work, we reported a novel composite electrode material, Co-Ni(OH)2/carbon sphere, obtained by a solvothermal method. At first, the activated carbon spheres with an uniform size of about 4µm were synthesized, and then the sheet-like Co-Ni(OH)2 adsorbed on the cracks and outer surface of the carbon spheres to form the Co-Ni(OH)2/carbon sphere composite. The influence of mass ratio of Co-Ni(OH)2 to carbon spheres on capacitance performance was investigated. Benefitting from the unique composite structure, the synthesized Co-Ni(OH)2/carbon sphere presents a high specific capacitance up to 959.7 F/g in 6 M KOH at current density of 1 A/g. Meanwhile, the capacitance retention maintains its 75% after 3000 cycles, which is about 2.8 times higher than that of the pure Co-Ni(OH)2, indicating a good stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wenxiu He,Hengrui Qiu,Jing Meng,Bin Liu,Jinlong Cui,Yongqiang Zhang
A nanoscale petal-like α-Ni(OH) 2 /reduced graphene oxide (α-Ni(OH) 2 /RGO) composite was synthesized with the one-step microwave method. α-Ni(OH) 2 particles with sizes of approximately 200 nm are uniformly distributed on the reduced graphene oxide sheet in the sample. When used as an electrode for alkaline rechargeable batteries, the discharge capacity of the α-Ni(OH) 2 /RGO composite reaches 333.5 mAh/g at 0.2C and 247.1 mAh/g at 10 C, respectively, with an excellent rate capability. After 2000 cycles, the capacity of the electrode is insignificantly attenuated, indicating a high capacity retention and cycling stability. The outstanding electrochemical properties are attributed to the nanoscale petal-like structure α-Ni(OH) 2 anchoring on the RGO sheets, which facilitates ion diffusion and increases the active surface, which is effectively reacting with the electrolyte. The nanoscale petal-like electrode material fabricated in this study provides clues to address the problem of energy applications of high-performance alkaline rechargeable batteries.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yan Xu,Linjie Xie,Di Li,Rong Yang,Deli Jiang,Min Chen
The exploration of earth-abundant and high-efficiency electrocatalysts for water oxidation is of great significance for sustainable energy conversion. Co–Mo-based bimetallic oxides are considered as promising candidates for the oxygen evolution reaction (OER) due to their high intrinsic activity and low cost. In this work, we reported an interfacial engineering design of CoMoO4 nanoplate arrays wrapped with Ni(OH)2 nanosheets supported on Ni foam for high-performance OER. Remarkably, benefiting from the hierarchical heterostructure arrays with strong interfacial interaction, enlarged surface areas, and more active sites, the optimized CoMoO4-Ni(OH)2 electrocatalyst manifests the excellent OER catalytic performance with a low overpotential of 349 mV at the current density of 100 mA cm–2, a long-term stability, and high (nearly 100%) Faradaic efficiency, which is superior to those of most previously reported Co–Mo-based bimetallic oxides electrocatalysts. Therefore, this interfacial engineering demonstrates an effective strategy for designing and fabricating high-performance electrocatalysts for OER reaction.
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