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.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
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 .
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yafeng Wang,Xian Luo,Wenjie Lu,Bin Huang,Yanqing Yang
In this study, β-Ni(OH)2 with a unique flower-like morphology was synthesized through a hydrothermal method. The doping of Rh in β-Ni(OH)2 was achieved by a reduction method. The as-synthesized catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy for the crystal structure, morphology, composition, and chemical state analysis. The electrochemical tests revealed that the doping of Rh can significantly increase the electrocatalytic performance of β-Ni(OH)2 in 1.0 M KOH solution. The methanol oxidation peak current density of Rh-doped β-Ni(OH)2 reached 95 mA cm–2 with a Tafel slope of 40 mV dec–1. The reason for these improvements is that Rh can suppress the phase transformation of NiOOH from β to α. Meanwhile, the electronic structure change of nickel in β-Ni(OH)2 and the defect ratio increase caused by Rh doping are beneficial to methanol oxidation reaction (MOR) catalytic activity. Furthermore, the synergistic effect between Rh and Ni(OH)2 improved the surface activity of β-NiOOH. The doping of Rh in β-Ni(OH)2 is initiative in this work, which provides a new strategy to design highly efficient and cost-effective MOR electrocatalysts for alkaline DMFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Baojin Jia,Qianyun Zhou,Leiying Gao,Lulu Wang,Mingyang Liu,Shiwu Xu,Genlin Zhang
The insufficient energy density of electrode materials has hindered the popularity and application of supercapacitors. The construction of hybrid supercapacitors offers an ideal solution by combining transition-metal hydroxides with high specific capacity and biochar with excellent conductivity. In this study, an electrode material (β-Ni(OH) 2 @AC 22 composite) was created by in situ growth flower-like β-Ni(OH) 2 nanosheets on biochar (AC) that extracted from the seed coat of Xanthoceras sorbifolium Bunge . This β-Ni(OH) 2 @AC 22 composite exhibited a remarkable specific capacity of 617.5C g −1 (1 A g −1 ), nearly four times that of AC, and remarkable cycling stability (85.6 % retention after 5000 cycles). Using this composite as the positive electrode and biochar as the negative electrode, the assembled battery-type hybrid supercapacitors (HSCs) achieved a specific capacity of 92.75C g −1 (1 A g −1 ). The HSCs demonstrated a specific energy of 57.9 Wh kg −1 , a specific power of 750.9 W kg −1 , and even maintained 42.2 Wh kg −1 at a maximum specific power of 6049.4 W kg −1 . The device maintained a specific capacity of about 78.7 % after 7000 charging/discharging cycles, demonstrating good practical performance. These results highlight the practical application potential of the prepared composites in supercapacitors, with biochar serving as a basis for enhancing the electrochemical performance of supercapacitors.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Weijun Liang,Senlin Wang,Yanxiu Zhang,Jian Gu,Kaida Zhu,Jing Zhong,Xinru Wang
β-Ni(OH) 2 with good crystallinity is grown on the surface of the flower-like α-Ni(OH) 2 to form a 3D α@β-Ni(OH) 2 material by a two-step hydrothermal method . The synthesized β-Ni(OH) 2 is nanometer size and strong alkali stability, while the α-Ni(OH) 2 has a large specific surface, high specific capacity and good electrical conductivity , so there are multiple synergistic effects between the β-Ni(OH) 2 coating and the α-Ni(OH) 2 core. Coupled with a 3D flower-like structure, the obtained α@β-Ni(OH) 2 electrode shows a high capacity of 431 mAh g −1 at a current density of 1 A g −1 . Furthermore, we use the α@β-Ni(OH) 2 electrode and the activated carbon (AC) electrode to assemble an asymmetric supercapacitor (ASC) device. This ASC shows the excellent energy density of 53 Wh kg −1 at a power density of 875 W kg −1 and capacity retention rate of 78% after 5000 cycles. Finally, metal hydride (MH) is used to replace the AC negative electrode, and a cell with a high energy density of 100.17 Wh kg −1 at a power density of 424.75 W kg −1 is obtained. The results show that α@β-Ni(OH) 2 electrode has better electrochemical performance than commercial electrodes and has application prospects in energy storage.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2015
·Vol. 22
·期 4
·573-579
·
IF 1.754
Ma Wenle,Xue Junying,Cui Hongtao
Hexagonal β-Ni(OH) 2 nanosheets with thickness of ∼12 nm were synthesized by a hydrothermal method at 150 °C using nickel chloride as nickel source and morpholine as alkaline. Electrodes for application in pseudocapacitor were assembled through a traditional technique: pressing a mixture of β-Ni(OH) 2 nanosheets and acetylene black onto nickel foam. Due to the hexagonal shape of rigid β-Ni(OH) 2 nanosheet and the mediation of surface-modified glycerol during electrochemical charge–discharge cycles, a nanostructure of electrode material with facile interior pathway for the transfer of electrolyte was formed. As a result, the as-formed electrodes presented high specific capacitance of 1,917 F g −1 at current density of 1.6 A g −1 in 3 mol L −1 KOH solution. At high charge and discharge current density of 31.3 A g −1 , the electrodes still remained a high specific capacitance of 1,289 F g −1 . The interesting results obtained from this investigation may provide a new insight for the synthesis of electrode materials with high electrochemical performance.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
电化学
·
催化
·
材料科学
·
绿色化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源转换
·
无机合成
✓ 已验证
DOI
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.
研究领域:
分析化学
·
电化学
·
传感器与执行器
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）