JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Bo Lv,Xuefan Feng,Xiaoping Xi,Xinyan Feng,Zhenyu Yuan,Yu Yang,Fuqin Zhang
Heterogeneously structured materials with supported precious metals , such as Pd, Pt, and Ru, as co-catalysts are important catalysts for efficient photocatalytic water splitting. However, the high costs and low reserves of precious metals have been an obstacle to their application in hydrogen production . In this work, the noble-metal-free Cd 0.3 Zn 0.7 S solid solution was designed and synthesized with an optimized molar ratio of Cd/Zn for the best visible light photocatalytic performance. In addition, a heterojunction hybrid material formed between the Cd 0.3 Zn 0.7 S and Ni(OH) 2 nanosheet was engineered to improve the utilization of light and to inhibit the recombination of holes and electrons. Ni(OH) 2 nanosheets assisted the transfer of the photoexcited electrons to participate in the reduction reactions which is critical for efficient and rapid catalytic hydrogen production. The photoelectrochemical property of the hybrid material was investigated with UV–vis absorption, photoluminance (PL) and electrochemical impedance spectroscopy measurements. The mechanism of the high-efficiency and low-cost photocatalytic hydrogen production was established by analyzing the hydrogen evolution kinetics. With the success of replacing precious metal with nickel-based surface heterostructure, this work is expected to provide a new type of photocatalyst for the application of photocatalytic hydrogen production.
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高影响因子
JOURNAL OF CLUSTER SCIENCE
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2020
·Vol. 32
·期 5
·1371-1379
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IF 1.731
Zhang Yingzhen,Song Yingying,Li Yancai
A simple and environment-friendly autocatalytic reduction process was developed for synthesis of Au/Ni(OH) 2 nanocomposites. The nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It is found the nanocomposites are composed of ultrathin Ni(OH) 2 nanosheets and gold nanoparticles (AuNPs), and the AuNPs disperse evenly on the Ni(OH) 2 nanosheets. The electrochemical and electrocatalytic properties of the Au/Ni(OH) 2 modified glassy carbon electrode (Au/Ni(OH) 2 /GCE) were investigated by electrochemical experiments. Furthermore, through optimizing Au loading of the nanocomposites, the 5%-Au/Ni(OH) 2 /GCE displays the best electrocatalytic activity towards glucose oxidization in alkaline medium. Under optimal conditions, the 5%-Au/Ni(OH) 2 /GCE displays a wide linear range of 0.01 to 3.15 mM (R 2 = 0.998) to glucose. Besides, the sensor has a low detection limit of 0.10 μM (S/N = 3) and a high sensitivity of 342.1 μA·mM −1 ·cm −2 . It also displays satisfying stability, good reproducibility and selectivity.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lingjiao Li,Jing Xu,Binyi Su
In the field of photocatalysis, most of the photocatalysts are semiconductors. Recent years, there have been many photocatalytic systems related to non-semiconductor catalysts. In this paper, a photocatalytic hydrogen evolution system of hexagonal Ni(OH) 2 derived from CuNi bimetal is obtained by classical hydrothermal method. The derived hexagonal Ni(OH) 2 can promote the separation of photogenerated electron-hole pairs and greatly improve the effect of photocatalytic hydrogen evolution. The electron-hole pair comes from the surface plasmon resonance (SPR) effect of Cu from CuNi composite. It is worth noting that photoluminescence spectra and photoelectrochemical experiments have confirmed that the CuNi-5 complex can effectively improve space charge separation. The results of linear scanning voltammetry show that the material has high current response characteristics. This system gives a practical solution for planning and synthesizing non-semiconductor catalysts with high photocatalytic activity.
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CHEMOSPHERE
·
2021
·
IF 7.086
Fang Zhu,Siyi Zhou,Mengying Sun,Jianfeng Ma,Wei Zhang,Kunjie Li,Hao Cheng,Sridhar Komarneni
Mg doped Ni(OH) 2 was synthesized and investigated as an efficient material to activate persulfate (PS) for phenol degradation. The property of the Ni(OH) 2 material was enhanced by Mg doping as the removal efficiency of phenol was increased from 74.82 % in Ni(OH) 2 /PS system to 89.53 % in Mg-doped Ni(OH) 2 /PS system within 20 min. Such a high removal efficiency revealed that doping Mg into Ni(OH) 2 brings about more defects (oxygen vacancies), which facilitated the formation of more active species in the degradation process. The removal efficiencies of phenol increased with the increase of the initial pH from 3 to 11. The influences of Cl − , NO 3 − and HCO 3 − on the stability of the system were also studied and the results showed that removal rates of all systems in the presence of these different inorganic anions could reached about 90 % within 20 min. Based on the electron spin resonance (ESR) experiments, 1 O 2 , O 2 ·- , ·OH and SO 4 •− were identified as the active species in Mg-doped Ni(OH) 2 /PS system for phenol degradation and a degradation mechanism was proposed for this system. In addition, the as-prepared material retained its activation performance even after 3 repeated cycles.
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高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 20
·5313-5320
·
IF 3.975
Jingting Chen,Suqin Ci,Genxiang Wang,Nangan Senthilkumar,Mengtian Zhang,Qiuhua Xu,Zhenhai Wen
Graphical In nanotechnology we trust : A high-performance acid-alkali asymmetric-electrolyte electrolyzer (AAAE) was set up to implement energy-saving H 2 generation thanks to nanotechnology advances that enable us to develop self-supported electrodes with Ni(OH) 2 nanosheets for high-activity catalysis of urea oxidation. It is highly attractive to develop efficient water electrolysis route to implement hydrogen generation in a low-cost way, which while requires excess energy to surmount the activation barriers majorly limited by oxygen evolution reaction at anode side. Herein, we report an acid-alkali asymmetric-electrolyte electrolyzer (AAAE) that can achieve substantial energy saving for electrolysis hydrogen generation, thanks to the assistance of electrochemical neutralization energy (ENE) and urea oxidation reaction (UOR). To this end, free-standing Ni(OH) 2 nanosheets on carbon cloth (Ni(OH) 2 −NSs/CC) is fabricated as catalytic anode for alkaline UOR, which manifests impressively high catalytic activity with delivering 10 mA cm −2 at 1.32 V and long-term durability. The as-developed AAAE only requires an applied voltage of 0.66 V to release the electrolysis current of 10 mA cm −2 , yielding the H 2 Faraday efficiency close to 100 % along with H 2 production rate of 183.8 μmol h −1 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Qi Cao,Yucheng Shen,Jixing Bai,Qingyu Liu,Zhenzhen Zhao,Tingzhou Lei,Abdelghaffar S. Dhmees,Huiyan Zhang
Synthesizing high performance and affordable nickel-based electrocatalysts has been one of the research hotspots in the field of clean energy conversion. Herein, facile electroless plating accompanied with mild impregnation method is explored to synthesize petal-like Ni(OH) 2 flakes on carbon cloth (CC) for electrocatalytic alkaline hydrogen evolution reaction (HER). Notably, the optimal Ni(OH) 2 /CC electrode has outstanding HER activity requiring only 24.6 mV vs . RHE of overpotential to reach 25 mA cm −2 of current density, and only 101.5 mV vs . RHE of overpotential to reach 100 mA cm −2 . Meanwhile, the 25-h stability test results performed well. This is primarily due to its plentiful interfacial contact, favorable surface morphology of ultrathin and dense nanosheets array, and rapid electron transport . Overall, this study provides a viable approach for the development of efficient, low-cost, hydrophilic nickel-based catalysts for electrocatalytic water splitting applications.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Fangyan Liu,Xiang Chu,Haitao Zhang,Binbin Zhang,Hai Su,Long Jin,Zixing Wang,Haichao Huang,Weiqing Yang
Nickel hydroxide has shown extraordinary promise for hybrid supercapacitors because of the high theoretical capacity and low cost, but is usually limited by its low power density and complex synthetic process. Here, we report the design of a self-assembly three-dimensional (3D) porous Ni(OH) 2 for high-performance energy storage through a simple, cost-effective, and environmentally friendly solvothermal-precipitation method. The 3D structure with interconnected network provides superior electron transportation properties, and the hierarchical porous architecture facilitates quick ion diffusion. The Ni(OH) 2 obtained at 250 °C delivers a high capacitance of 2110 F g −1 at 1.0 A g −1 and a moderate cycling stability with 53% of the maximum specific capacitance over 2000 cycles at 5.0 A g −1 . Additionally, on integration of the prepared Ni(OH) 2 with hierarchically porous carbons as negative electrode material , the hybrid supercapacitor device delivers a high capacitance of 115 F g −1 and a high energy density of 40.9 W h kg −1 at a power density of 405 W kg −1 . This study not only provides a simply controllable growth method of the unique self-assembly 3D porous Ni(OH) 2 with high performance but also opens up a new approach to prepare various metallic oxides/hydroxides with excellent performance for highly promising practical energy-storage systems.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Li Jiang,Junaid Ali Syed,Yangzhi Gao,Hongbin Lu,Xiangkang Meng
In the present paper, polyaniline (PANI) coating was electropolymerized in the presence of phosphoric acid with subsequent deposition of Ni(OH) 2 particles. The Ni(OH) 2 reinforced PANI coating significantly enhances the corrosion resistance of 304 stainless steel (304SS) in comparison with the pristine PANI coating. The galvanostatically deposited Ni(OH) 2 particles fill the pores of the pristine PANI coating and improves the coatings hydrophobicity which decreases the diffusion of aggressive media. Importantly, the R p values of Ni(OH) 2 reinforced PANI coating is much higher than that of pristine PANI coating and the Ni(OH) 2 reinforced PANI coating presents a long-term anti-corrosive ability (360 h) in 3.5 wt% NaCl solution. The prolonged corrosion protection of Ni(OH) 2 reinforced PANI coating is attributed to the improved physical barrier as well as the facile formation of passive oxide film that sustain the anodic protection of the coating.
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Nanomaterials
·
2017
·Vol. 7
·期 8
·205
·
IF 3.553
Yongjian Li,Panpan Guan,Fucheng Yu,Wei Li,Xiaoling Xie
The electrode based on cerium oxide (CeO2) nanorods embedded in nickel hydroxide (Ni(OH)2) matrix were prepared and used for detecting glucose non-enzymatically. The materials were characterized by X-ray diffraction, transmission electron microscopy (TEM), and so on. The results indicate that the response of CeO2/Ni(OH)2nanocomposite are significantly improved due to the synergetic effect between CeO2and Ni(OH)2. The optimum CeO2/Ni(OH)2nanocomposite electrode exhibits a detection range from 2 μM to 6.62 mM, a sensitivity of 594 μA mM−1cm−2, an estimated detection limit of 1.13 μM, and a response time less than 5 s. In addition, this biosensor also shows good selectivity, long term stability, and accurate measurement in juice on sale.Keywords:cerium oxide;nickel hydroxide;biosensor;glucose;nanocomposite
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ADVANCED ENGINEERING MATERIALS
·
2024
·
IF 3.4
Fei Chen,Chengbao Liu,Leizhi Zheng,Feng Chen,Junchao Qian,Yongbin Qiu,Xianron Meng,Zhigang Chen
Nickel hydroxide (Ni(OH) 2 ) is recognized as a promising material for electrodes in supercapacitors owing to its exceptional theoretical specific capacitance. However, Ni(OH) 2 has several drawbacks, including a short cycle life, susceptibility to volume expansion, and poor electrical conductivity. In this work, Ni(OH) 2 nanosheets anchored on layered g-C 3 N 4 /C (Ni(OH) 2 –g–C 3 N 4 /C) are designed by biological template induction and a hydrothermal method. Ni(OH) 2 –g–C 3 N 4 /C has unique petal-like structures, which can provide a vertical charge transport channel to increase reaction potential of the material during the charge–discharge process. The introduction of biomass carbon can solve the problem of the bulk phase accumulation of g-C 3 N 4 and can also improve the overall conductivity of the composite. Compared to Ni(OH) 2 (522 F g −1 ), g-C 3 N 4 /C (76.2 F g −1 ), and g-C 3 N 4 (16 F g −1 ), the Ni(OH) 2 –g–C 3 N 4 /C-0.75 (NGC-0.75) composite exhibits the highest specific capacitance of 1034 F g −1 at 1 A g −1 . Furthermore, after 5000 cycles at 5 A g −1 , the capacitance of the material is maintained at 85.97%. Meanwhile, the asymmetric supercapacitor based on the NGC-0.75 shows a high energy density of 18.29 Wh kg −1 at the power density of 400.02 W kg −1 with excellent cyclic stability of 127.45% over 10 000 cycles.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 85
·期 2
·349-355
·
IF 1.575
Shi Min,Li Yanhong,Wang Li,Li Jing,Wang Meiri,Cui Hongtao
Abstract In this work, a facile material synthesis step-free strategy for the cost-effective assembly of Ni(OH) 2 -based electrodes was reported. The Ni(OH) 2 /MWCNTs composite electrodes for application in supercapacitors were assembled through the in-situ reaction of NiCl 2 ·6H 2 O in nickel foam as current collector with alkaline electrolyte. The characterization results indicated that NiCl 2 ·6H 2 O as raw material in electrode underwent the phase transformation from NiCl 2 ·6H 2 O to β-Ni(OH) 2 in electrolyte solution. The produced β-Ni(OH) 2 presented the same phase and same sheet morphology with thin thickness before and after electrochemical measurement. Based on the results of electrochemical measurement, 20 wt% was determined as the optimum content of MWCNTs for the assembly of electrodes. The as-assembled electrode with optimized content of MWCNTs exhibited high specific capacitance of 2001.4 F g −1 at current density of 3.2 A g −1 . This electrochemical performance of electrode could be attributed to the 2D flexible sheet morphology of Ni(OH) 2 and the improvement of electric conductivity by MWCNTs. Graphical abstract
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Progress in Natural Science-Materials International
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2022
·
IF 4.269
Yu Zhang,Xueai Teng,Zequn Ma,Rongming Wang,Woon-Ming Lau,Aixian Shan
Cu 2 O is an ideal template material for the preparation of transition metal hydroxide/oxyhydroxides with oxygen evolution reaction (OER) enhanced catalytic performance. Here, inspired by Pearson's principle, Cu 2 O wires were prepared and used as a sacrificial template to prepare Ni(OH) 2 ·0.75H 2 O hollow tubes (Ni(OH) 2 HTs) with highly improved surface roughness. Benefiting from unique structural advantages, the Ni(OH) 2 HTs showed excellent catalytic activity, rapid kinetics and a long-term stability as the OER catalyst, where an overpotential of only 207 mV was required to drive a current density of 10 mA cm −2 , an ideal kinetics with a Tafel slope as 79.8 mV dec −1 was calculated, and no obvious attenuation in chronoamperometry was discovered after operation for 24 h. This paper provides a novel template-assisted strategy to prepare high-performance transition metal-based OER catalysts possessing hollow and tubular structures.
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