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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PubMed
高影响因子
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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JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 8
·1-8
·
IF 2.175
Wang Minmin,Ren Wanzhong,Zhao Yunan,Liu Yan,Cui Hongtao
In this work, β-Ni(OH) 2 monolayer nanosheets, which had been thought to be unachievable, were successfully prepared for the first time by a one-pot strategy using epoxide as precipitation agent and sodium dodecyl sulfate (SDS) as surfactant. The characterization results indicate that the formation of monolayer morphology depends on the mediation of SDS molecules. The XRD patterns demonstrate the loose and defective packing of Ni(OH) 2 layers in the SDS intercalated samples. The disappearing of vibration band of free hydroxyl groups in the FTIR spectra suggests the interlayer separation resulted by SDS. The TEM and AFM images further confirm the formation of monolayer nanosheets. It is proposed that the in situ modification of the secondary growth unit of β-Ni(OH) 2 by SDS allows its two-dimensional anisotropic growth through steric hindrance of SDS molecules. In addition, this effect allows isolation of β-Ni(OH) 2 from solvent with keeping of monolayer nanosheet state in dry powder. The electrochemical measurement results indicate that β-Ni(OH) 2 monolayer nanosheets own much higher urea electrolysis performance than their corresponding multilayer structure.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chi Zhang,Zhuohong Xie,Yi Liang,Dingding Meng,Zheng Wang,Xin He,Weiye Qiu,Mei Chen,Ping Liang,Zhonghua Zhang
Ni(OH) 2 has been long studied as an effective oxygen evolution electrocatalyst . Nevertheless, its catalytic activity can still be further enhanced by microstructural modification and Fe-doping. In this study, with the assistance of adsorbent ferrihydrite (FH), we obtain Fe-doped β-Ni(OH) 2 nanoplates with Fe 2 O 3 nanoparticles decorated on the surface via a facile hydrothermal process. The Fe-doping, decorated Fe 2 O 3 nanoparticles , and special microstructure endow β-Ni(OH) 2 nanoplates with an improved oxygen evolution activity in alkaline solutions. For the sample with optimal FH amount, the overpotential to motivate a current density of 10 mA cm −2 is 280 mV, with a low Tafel slope of ~64.17 mV dec −1 . During the 10 h i-t test at 1.50 V vs. RHE , the current density has an attenuation of only 23.7%. The study opens a facile avenue to modify Ni(OH) 2 -based OER catalyst from perspectives of both microstructures and compositions .
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Liru Yan,Shishuai Sun,Shuangting Ruan,Xiaocheng Liu,Huanqi Cao,Shougen Yin
Design of the photosensitive electrode material provides an effective strategy to improve the capacity and stability of supercapacitors. In this study, the photothermal-driven cobalt–zinc-doped Ni(OH)2/g-C3N4@NF nanoflower electrode materials were prepared base on the in situ chemical etching strategy. The electrochemical performance indicated that the optimized CZNC2.18 (cobalt–zinc codoped β-Ni(OH)2@g-C3N4) electrode material with exceptional stability (103.74% capacitance retention after 5000 cycles at 20 mA/cm2) exhibited an ultrahigh capacitance of 19.10 F/cm2 at a current density of 10 mA/cm2 under illumination, compared to 12.8 F/cm2 under dark conditions, achieving a light gain of 149%. The assembled asymmetric photothermal-assisted supercapacitor device delivers energy densities of 3.55 mWh/cm2 (1.23 mWh/cm2) at corresponding power densities of 8.39 mW/cm2 (37.03 mW/cm2) under illumination, surpassing performance metrics observed under dark conditions. The synergistic effects of photogenerated carriers (holes oxidizing Ni(OH)2 to NiOOH and electrons enhancing conductivity), Zn/Co codoping-induced conductivity improvement, and photothermal-assisted ion transport collectively enable CZNC2.18 exceptional photoelectrochemical performance, establishing a paradigm for light-responsive energy storage material design.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jingwen Zhang,Chuchu Cheng,FangShu Xing,Cheng Chen,Caijin Huang
Engineering semiconductor materials with vacancies and co-catalysts is a valid method to improve their photocatalytic performance. Herein, we prepared S vacancies-rich Mn 0.3 Cd 0.7 S nanorods modified with β-Ni(OH) 2 nanoparticles through solvothermal and co-precipitation strategies. The as-obtained 0D/1D β-Ni(OH) 2 /Mn 0.3 Cd 0.7 S nanorods exhibit excellent visible-light H 2 -production activity up to 71.09 mmol g −1 h −1 , 5.23 times higher than pure Mn 0.3 Cd 0.7 S and better than 1 wt% Pt/Mn 0.3 Cd 0.7 S and most reported Mn x Cd 1−x S-based catalysts. The apparent quantum yield reaches 46.68% at λ = 420 nm. We found that the presence of S vacancies and β-Ni(OH) 2 enhances the transfer/separation of photogenerated carriers and increases reaction sites, which is beneficial to photocatalytic H 2 -production reaction. This work proposes a new idea for the application of metal hydroxide co-catalysts and S vacancies in sulfide materials for photocatalytic H 2 production.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 9
·1-9
·
IF 2.278
Cui Hongtao,Xue Junying,Ren Wanzhong,Wang Minmin
In this work, β-Ni(OH) 2 monolayer nanosheets were prepared in benzyl alcohol by a facile exfoliation-free sol–gel route. The hydrolysis reaction of metal ions was started with the ring-opening reaction of epoxide. The in situ modification of benzyl alcohol molecules on the surface of secondary growth unit of hydroxide allowed the formation of β-Ni(OH) 2 monolayer nanosheets and 100 % monolayer state of β-Ni(OH) 2 in the resultant suspension. As proven in the electrochemical measurement, the maximum specific capacitance of 1735 F g −1 was obtained at scan rate of 5 mV s −1 within potential window of 0.6 V in 6 mol l −1 KOH aqueous solution, which is equal to the theoretical value of β-Ni(OH) 2 . This high electrochemical performance is attributed to the complete exposure of every structure unit of β-Ni(OH) 2 to electrolyte. This work demonstrates that monolayer nanosheets can generate from the brucite-type nickel hydroxide through this bottom-up strategy although it had been theoretically considered to be impossible.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weiwei Yang,Mao Peng,Ye Lv,Mengya Sun,Jinli Zhang,Wei Li,Yan Fu
2-Hydroxybenzaldehyde (SALD) exhibits special reactivity in various chemical reactions due to the existence of aldehyde and hydroxyl groups, which also make it a challenge to achieve high conversion and selectivity for SALD production. Herein, β-Ni(OH) 2 nanosheets over nickel foam (NF) at different hydrothermal temperatures were synthesized for electrocatalytic oxidation (ECO) of 2-hydroxybenzyl alcohol (SAL) into SALD. The β-Ni(OH) 2 electrode obtained at 160 °C achieves the best ECO performance in 2.5 M KOH at the applied potential of 1.45 V (RHE), showing the SALD selectivity of 78.90% and the Faradaic efficiency of 87.94% at the SAL conversion of 69.76%. ECO of SAL reduces the cell voltage and boosts the hydrogen productivity by 2.74 times. It is of great importance to find that potential-driven surface reconstruction of β-Ni(OH) 2 enables selective conversion of SAL into SALD. Side reactions including OER as well as oxidation of phenolic group can be effectively controlled via regulating applied potentials on β-Ni(OH) 2 . This work is the first report on direct electrochemical oxidation of SAL with high SALD selectivity, and offers a green and clean strategy for highly selective production of SALD under mild conditions.
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Nano Energy
·
2012
·
IF 0
Junfeng Xie,Xu Sun,Ning Zhang,Kun Xu,Min Zhou,Yi Xie
With the dramatic development of portable electronics, power sources with ultrathin geometries and ultraflexibility have become an important prerequisite. In this rising field, all-solid-state thin-film supercapacitors (ASSTFSs) have received tremendous attentions due to their ultraflexibility and high safety, which are considered as competitive candidates for energy supplies in flexible electronics. However, state of the art for ASSTFSs based on carbonaceous materials and conducting polymers exhibits relatively low capacitance, which restricts their practical applications. In this study, we demonstrate the first successful application of pseudocapacitive transition metal hydroxides in all-solid-state thin-film supercapacitor (ASSTFS), exhibiting high capacitance, remarkable high-rate capability and long-term cycling stability. The free-standing thin-film electrode was fabricated by β-Ni(OH) 2 /graphene nanohybrids with unique layer-by-layer characteristics. The nanohybrids can be easily exfoliated into ultrathin hybrid nanoflakes with thickness of ∼10 nm and reassembled into free-standing thin-film electrode with ultraflexibility. The novel layer-by-layer structure could efficiently integrate both merits of pseudocapacitive β-Ni(OH) 2 and conducting graphene, resulting in extraordinary electrochemical performance in ASSTFSs. The highest specific capacitance of 660.8 F cm −3 for ASSTFSs was achieved with negligible degradation even after 2000 charge–discharge cycles, demonstrating the high-performance electrochemical property and superior cycling stability. And the all-solid-state nature combined with superior electrochemical performance and ultraflexibility makes our device an outstanding candidate for power sources in portable electronics.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Jing-He Yang,Xiuhong Xu,Miaomiao Chen,Duo Yang,Hongye Lu,Yazhou Sun,Can Shao,Qiangqiang Song,Jie Zhang,Li Gao,Yatao Zhang
The establishment of non-noble metal electrocatalysts with controllable morphology is crucial significance for overall water splitting. Ni-based catalyst is perceived as a promising electrocatalyst due to its excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance. Herein, β-Ni(OH) 2 /NF is designed for OER and HER, using a facile hydrothermal etching method. The separation rate of hydroxide is controlled by the copper-ammonium complexation reaction, and the different amounts of oleic acid is added as a protective agent to regulate the surface morphology of the Ni foam. The ingenious combination of several reactants allows us to synthesize different morphology catalysts, and get the best performance from them. The catalyst exhibits superior OER and HER electrocatalytic performance, which overpotential is 329 mV during the OER and 170 mV for the HER at 50 mA cm −2 . Meanwhile, it demonstrates small Tafel slopes of 51 mV dec −1 for HER and 40 mV dec −1 for OER in 1.0 M KOH solution. Moreover, the catalyst presents a stable activity with no significant attenuation after 24 h OER and HER reaction. The hydrothermal etching method is expected to offer an adjustable synthetic strategy for the reasonable design of highly efficient, durable and non-noble-metal bifunction catalysts.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 89
·期 2
·492-499
·
IF 1.745
Wang Li,Li Jing,Wang Meiri,Liu Yuanyuan,Cui Hongtao
Abstract 2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was synthesized by a strategy of nickel complex template. The 2D Co 2+ -doped β-Ni(OH) 2 was produced by the in situ reaction of 2D Co 2+ -doped template in strong alkaline electrolyte solution during electrochemical measurement. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the Co 2+ -doped β-Ni(OH) 2 exhibited high electrochemical performance. It had high specific capacitance of about 2100 F g –1 at low current density of ~2 A g −1 . It also exhibited excellent high rate performance (1259 F g –1 at high current density of 41.7 A g −1 ), much higher than the undoped sample. The results in this work indicated that the Co 2+ -doped β-Ni(OH) 2 could be used as an effective electrode material in redox supercapacitors.
2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was in situ synthesized by a strategy of nickel complex template. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the as-synthesized material exhibited excellent high rate electrochemical performance.
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ChemElectroChem
·
2017
·Vol. 4
·期 11
·2826-2834
·
IF 4.136
Shuxia Yuan,Chunxiang Lu,Ying Li,Xiaomin Wang
Graphical Method to the madness : Porous lamellar structure Ni(OH) 2 /RGO composites with a large capacitance are synthesized by using a facile two-step deposition/reduction method. The method promotes the deposition of more Ni(OH) 2 and full utilization of RGO. Moreover, additives are avoided. The Ni(OH) 2 /RGO composite synthesized by using the two-step method exhibits a high specific capacitance of 2877 F g −1 , long cycle life with capacitance retention of 86.5 % after 4000 cycles, and high energy density of 120.9 Wh kg −1 at a power density of 0.14 kW kg −1 . Ni(OH) 2 /RGO composite are synthesized though a facile two-step method, in which the Ni(OH) 2 deposition and GO reduction processes take place separately. The present methods promote the deposition of more Ni(OH) 2 and full utilization of RGO, owing to the high reactivity, good solubility, and dispersity of GO. Moreover, the utilization of additives is avoided. The Ni(OH) 2 /RGO synthesized by using the two-step method shows a uniform porous lamellar structure with a high specific surface area. When employed as a supercapacitor electrode material, the Ni(OH) 2 /RGO composite exhibits a high specific capacitance of 2877 F g −1 , long cycle life with capacitance retention of 86.5 % after 4000 cycles, and high energy density of 120.9 Wh kg −1 at a power density of 0.14 kW kg −1 . The Ni(OH) 2 /RGO composite prepared by using the two-step method in this work shows 11.8–85.1 % higher specific capacitances than composites fabricated by using the other method. The excellent performances and the facile synthesis method highlight the promising potential of the present Ni(OH) 2 /RGO composite in supercapacitor applications.
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