ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanfei Xin,Xin Dai,Guangjun Lv,Xuedong Wei,Sai Li,Zhiqiang Li,Tong Xue,Ming Shi,Kunyang Zou,Yuanzhen Chen,Yongning Liu
α-Ni(OH)2 is an ideal candidate material for a supercapacitor except for its low conductivity and poor stability. In this work, BO2–-intercalated α-NixCo(1–x)(OH)2 is synthesized by a hydrothermal method at a low cost. The Co dopant can decrease the charge-transfer resistance and enhance the cyclic stability. The special unsaturated electronic state of BO2– enhances the bonding with metal ions and attracts water molecules. Thus, the BO2– ions support the hydroxide layers as pillars and create efficient paths for proton transportation, optimizing the utilization of α-Ni(OH)2. The three-dimensional (3D) flowerlike morphology supplies an enormous number of active sites, and r-GO is added to improve the conductivity. As a result, the modified α-Ni(OH)2 exhibits the specific capacitance of 2179, 1592, and 1423 F·g–1 at 1, 20, and 40 A·g–1, respectively, showing improved rate performance. Matching with the commercial activated carbon (AC) as an anode, the asymmetric capacitor delivers an energy density of 40.66 W·h·kg–1 when its power density is 187.06 W·kg–1. Meanwhile, it retains 81.5% capacitance of the initial cycle at 5 A·g–1 after 3000 cycles. With conductivity enhanced and structure stabilized, the modified α-Ni(OH)2 confronts broader fields of application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuyu Li,Fang Luo,Yuhua Xie,Chaofeng Chang,Ming Xie,Zehui Yang
Urea oxidation reaction (UOR) is a promising substitution of oxygen evolution reaction (OER) in overall water splitting technology because of the lower theoretical potential; thereby, a win-win benefit is achieved due to the simultaneous hydrogen generation and water purification . The efficient UOR catalysis substantially depends on the exposed active sites and mass transfer resistance, especially at high current density to meet the requirement of industrial water splitting technology. In this work, we have synthesized α-Ni(OH) 2 porous nanoflowers (α-Ni(OH) 2 –PNF) using ZIF-67 as template. Ascribing to the Kirkendall effect , nanopores are created on α-Ni(OH) 2 nanosheets benefiting for the formation of abundant oxygen vacancies as well as drop-off in mass transfer resistance during UOR catalysis. Meanwhile, the binding strength between active site and CO 2 , rate-determining step of UOR, is weakened by oxygen vacancies; as a result, only 1.477 V vs. RHE is demanded for α-Ni(OH) 2 –PNF to catalyze UOR with 100 mA cm −2 , 67 mV lower than α-Ni(OH) 2 nanosheets. Besides, an exceptional stability is also achieved for α-Ni(OH) 2 –PNF with negligible degradation during 20 h catalysis.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Jing-He Yang,Chao Wang,Duo Yang,Xingyun Li,Peng Shang,Yamin Li,Ding Ma
The boron-doped α-Ni(OH) 2 nanoflowers (B-α-Ni(OH) 2 ) with high specific surface area (400 m 2 g −1 ) were synthesized by the one pot liquid-phase method using P123 (EO 20 PO 70 EO 20 ) as template and NaBH 4 as alkali and boron sources. The size of the B-α-Ni(OH) 2 nanoflowers is about 300 nm and there are many porous. The 50 nm nanoplates are the basic structure units of nanoflowers and thickness of the nanosheets is approximately 5 nm. The content of B is about 15% among the Ni, B, O elements and boron exists mainly in the form of BO 2 − , which was confirmed by XPS characterization. B-α-Ni(OH) 2 nanoflowers exhibit a high specific capacitance of ~2296 F g −1 at a charge and discharge current density of 3 A g −1 with excellent cycling ability. The high specific capacitance and remarkable rate capability are promising for applications of B-α-Ni(OH) 2 nanostructures as advanced electrochemical capacitor materials with both high energy and cycling ability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Ruiyang Zhang,Tao Ran,Yuehan Cao,Qian Zhang,Fan Dong,Guidong Yang,Ying Zhou
Catalysis oxidization has been known to be an effective technique in environmental remediation. However, low efficiency for oxygen activation and difficult recovery of the catalysts in powdery form significantly limit the practical application. In this work, a new-type monolithic α-Ni(OH)2/Ni-foam was fabricated by the hydrothermal process. We found that H atoms of α-Ni(OH)2 can significantly promote oxygen activation, which endows it with favorable NO and NO2 oxidization confirmed by theoretical calculation and in situ DRIFTS. Furthermore, the introduction of Ni foam accelerated the pollutant gas transfer and charge carriers’ separation because of its abundant porous structure and high conductivity and its monolithic property simplified the recycling operation. Consequently, the obtained α-Ni(OH)2/Ni-foam achieved an excellent NO oxidation (69.0%) and no toxic NO2 was detected under visible light illumination (λ > 420 nm), indicating its highly promising potential in environmental remediation. Our work provides a conceptually different fresh perception to promote oxygen activation for highly efficient gas purification.
研究领域:
环境科学
·
催化材料
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 88
·85367-85373
·
IF 3.289
Wenle Ma,Li Wang,Junying Xue,Hongtao Cui
Usually, monolayer-stated nanosheets of hydroxides have to be prepared by a multiple step layer-exfoliation processe, following “bottom-up” mechanism. The related preparative procedure is quite exhaustive and low yielding. In this work, α-Ni(OH)2 monolayer nanosheets were successfully synthesized in pure ethanol solution with a high yield using NaOH as a precipitant, based on a facile one-step “bottom-up” strategy. It was proposed that the water-deficient environment in ethanol solution could not provide adequate water molecules for the formation of hydrogen bond to link the layers, resulting in monolayer formation. Due to the large interface between the monolayer and electrolyte, the obtained monolayer nanosheets presented high electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ruiyang Zhang,Tao Ran,Yuehan Cao,Liqun Ye,Fan Dong,Qian Zhang,Lizhi Yuan,Ying Zhou
Photocatalytic NO x removal is regarded as a promising technique for air purification in recent years. However, NO x removal process usually accompanies with toxic NO 2 generation, leading to serious secondary pollutant and limiting its practical application. Herein, a noble-metal-free g-C 3 N 4 /α-Ni(OH) 2 photocatalyst was fabricated through hydrothermal method. The introduction of α-Ni(OH) 2 microspheres combines with g-C 3 N 4 , resulting in an enlarged surface area from 35 to 95 m 2 /g, while the unique structure of α-Ni(OH) 2 broadens visible-light response range and accelerates photogenerated charge carriers transfer. More importantly, the H atoms of α-Ni(OH) 2 improve the adsorption and activation of O 2 and oxygen atoms to promote NO and NO 2 oxidized to nitrate. Consequently, g-C 3 N 4 /α-Ni(OH) 2 shows enhanced NO removal ratio of 51.3% without any toxic NO 2 generation, indicating its great potential for air purification. Our results provide fresh insight into the design of highly efficient and safe photocatalyst for toxic byproduct control in the application of environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Huajie Lan,Lei Tian,Wenfeng Wang,Yuan Li,Shumin Han,Lu Zhang
The currently used β -Ni(OH) 2 for alkaline nickel batteries are falling short of higher capacity demand. In contrast, α -Ni(OH) 2 with high theoretical capacity can address this need. However, the α -Ni(OH) 2 suffers from poor stability and intrinsic low electrical conductivity. Herein, we designed La/Ce-doped spherical α -Ni(OH) 2 and study the effect of La/Ce on the structure and electrochemical properties of α -Ni(OH) 2 . The increased specific surface area of the α -Ni(OH) 2 with La/Ce doping reduces the electron transfer resistance. The La/Ce-doped α -Ni(OH) 2 with 2 at% La (Ni-La-2) and 3 at% Ce (Ni-Ce-3) doping deliver high capacities of ∼365 mAh g –1 and ∼373 mAh g –1 , respectively, which is only 309 mAh g –1 for the pure α -Ni(OH) 2 . Meanwhile, the La/Ce-doping stabilizes the structural robustness of the α -Ni(OH) 2 during cycling. Notably, Ni-La-2 shows a superior stable cycling life with a capacity retention of ∼95 % after 400 cycles, which is ∼20 % higher than that of pure α -Ni(OH) 2 .
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
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
Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 3
·1635-1649
·
IF 1.7
Pan Weixing,Chen Hui,Chen Aicheng
A series of low-cost α-Ni(OH) 2 /SiO 2 catalysts were successfully fabricated by the vapor-induced internal hydrolysis method, then the hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF) was investigated by using the ethanol as the hydrogen donor over these as-prepared α-Ni(OH) 2 /SiO 2 catalysts. Based on the reaction results, these as-prepared catalysts, which could dispense with extra pre-reduction treatment before reactions, exhibited superior catalytic performance for the HMF hydrogenation to BHMF. A remarkable intrinsic selectivity of BHMF selectivity of almost 100% with about 90% HMF conversion could be obtained under 195 °C for 5 h in an N 2 atmosphere over the α-Ni(OH) 2 /SiO 2 catalyst of 5-Ni(OH) 2 /SiO 2 with about 5 wt% Ni on SiO 2 . The almost constant HMF conversion and BHMF intrinsic selectivity found from the recycling tests can indicate that the catalyst was stable without the obvious loss of its catalytic activity after recycling. Moreover, the mechanism of HMF hydrogenation using ethanol over the α-Ni(OH) 2 /SiO 2 catalysts could be referred to as the mechanism of the Meerwein-Ponndorf-Verley reaction. This work will provide a simple synthesis method for future design and development of high-performance, low-cost, and low-energy consumption catalysts for HMF hydrogenation to BHMF.
研究领域:
催化化学
·
生物质转化
·
绿色化学
✓ 已验证
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Wang Zhaomin,Zhao Chaoyue,Niu Xiaodong,Cheng Yong,Wang Limin,Huang Pai
With high theoretical discharge specific capacity, excellent reversibility of electrochemical reaction, and suitable oxygen evolution overpotential, α -Ni(OH) 2 is an auspicious cathode material for alkaline batteries, which supports the development of high-capacity nickel-based batteries. Nevertheless, α -Ni(OH) 2 exhibits substandard structural stability and is susceptible to crystalline transformation, leading to capacity degradation, affecting the battery charge/discharge performance and cycle life. In this study, the TiO 2 -nickel hydroxide (TiO 2 - α -Ni(OH) 2 ) is prepared by high-energy ball milling. Among them, TiO 2 can be uniformly dispersed on the surface of α -Ni(OH) 2 , which can effectively prevent the collapse of the α -phase structure. Benefiting from the unique elemental doping technology, the TiO 2 - α -Ni(OH) 2 composites as a nickel-metal hydride (Ni-MH) battery cathode can release a reversible specific capacity of 390 mAh g −1 at a 2 C rate for 200 cycles. A reversible specific capacity of 210 mAh g −1 is still released after 200 cycles at a 5 C rate. Consequently, TiO 2 - α -Ni(OH) 2 is a promising candidate for high-power Ni-MH batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Min Ma,Taotao Zhe,Yiyue Ma,Zonghan Wang,Qiang Chen,Jianlong Wang
Novel nanocomposite has tailorable properties and ordered 3D architecture similar to the structure of materials prepared by electrodeposition which is convenient and efficient but the reproducibility is limited because of the uncontrollable preparation process, was scientifically synthetized in controllable way and used for non-enzymatic glucose sensor for the first time. Flower-like α-Ni(OH) 2 with high specific surface areas and good anion transport ability benefited from its distinctive stacking faults and turbostratic disorder structure was synthesized through facile one-step hydrothermal method . Oversaturated gold nanoparticles (AuNPs) have been innovatively decorated on flower-like α-Ni(OH) 2 to improve the electrical conductivity, in turn, AuNPs would possess the higher catalytic activity when supported on Ni(OH) 2 , so the resultant AuNPs decorated α-Ni(OH) 2 (AuNPs@α-Ni(OH) 2 ) also has excellent synergistic catalytic effect and improved selectivity. On this basis, β-cyclodextrins functionalized reduced graphene oxide (β-rGO) with enhanced dispersivity was scientifically added at optimized proportion to reduce the interparticle resistance of AuNPs@α-Ni(OH) 2 as 2D electron transport channels, and to improve film-forming ability of the obtained nanocomposite via forming stable 3D network structure. Non-enzymatic glucose sensor fabricated through drop-casting the prepared nanocomposite on glass carbon electrode has high sensitivity up to 559.314 μA mM −1 cm −2 over the low concentration range and 327.199 μA mM −1 cm −2 over the higher concentration range, comparable to the sensors modified by electrodeposition method, indicating that prepared nanocomposite with controlling nanoscale composition and architectures based on rational design is an effective strategy to construct electrochemical sensor with excellent performance.
研究领域:
生物传感
·
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）