FUEL
·
2024
·
IF 6.7
Youbin Zheng,Ze Li,Hao Guo,Cunyin Liu,Yuefeng Chen,Xiumei Han,Liang Dong,Jianbing Zang
Hydrogen evolution reaction (HER) is considered as an effective pathway for hydrogen production. Herein, to obtain efficient HER catalyst, density functional theory is employed to figure out the optimal candidate for nickel sulfide. Guided by the mechanistic screening, the highly active HER electrocatalyst, Co-substituted Ni 3 S 4 , is synthesized by one-step hydrothermal method, resembling a vesicle composed of a broken spherical membrane and encapsulated clusters of nanospheres. Cracks on membrane provide a rational entry for reactant molecules to be enclosed in the vesicle. Additionally, the enhanced intrinsic activity also attributes to the upward shift of the d-band center. From the reaction energy diagrams, the decomposition of H 2 O* is confirmed as the rate-determining step (RDS) and the energy required for the RDS is efficiently lowered by the elevated d-band center, which made the catalyst achieves 185 mV overpotential at 100 mA·cm −2 and 38 mV at 20 mA·cm −2 lower than utmost Co-Ni-S relative electrocatalyst.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Lingxia Zheng,Lingtong Guan,Jianlan Song,Huajun Zheng
The rational structure design of nanohybrids plays a vital role in the supercapacitor performance of electrode materials . Herein, a novel sandwiched structure based on Ni(OH) 2 and amino-functionalized graphene quantum dots (Ni(OH) 2 /af-GQDs) is prepared via a facile green strategy. The layered Ni(OH) 2 nanosheets are spaced by amino groups from af-GQDs to afford a sandwiched configuration with an enlarged pore diameter of 1.8 nm, which leads to the decrease of random aggregation of Ni(OH) 2 nanosheets and dramatically facilitates the ion transport, thus contributing to the increased surface area and improved electrochemical capacitance . Besides, the introduction of af-GQDs leads to enhanced electrical conductivity and better cycling stability as well as contributing additional electrochemical double-layer capacitance, resulting in an outstanding specific capacitance of 2653 F g −1 at 1 A g −1 . An asymmetric supercapacitor (ASC) based on Ni(OH) 2 /af-GQDs and electrochemical-exfoliated graphene (EG) is assembled, exhibiting a wide potential window range, a high energy density , and an excellent cycling stability with 90.15% capacitance retention. These results definitely demonstrate the great potential of Ni(OH) 2 -based hybrid materials in the development of high-performance supercapacitors .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Shao-Qing Liu,Hao-Ran Wen,Ying-Guo,Yan-Wu Zhu,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Highly active, durable and cost-effective eletrocatalysts are crucial for hydrogen evolution reaction (HER). Herein, we report novel hollow hybrid spheres comprising of amorphous Ni(OH) 2 and crystalline CuS mesoporous nano-shelled heterostructures as efficient HER electrocatalysts . Spherical Cu 2 O particles are used as templates for fabrication of Ni(OH) 2 @CuS hollow spheres with nano-shelled heterostructures . The as-obtained catalysts exhibit much higher performance than the single Ni(OH) 2 , CuS, their physical mixture and crystalline Ni(OH) 2 @CuS toward water electrochemical reduction in alkaline medium . The superior HER electrocatalytic performance might be attributed to the unique hollow mesoporous nanoshelled architecture and the heterostructured synergetic effects between amorphous Ni(OH) 2 and crystalline CuS, in which the short-range order of the inner amorphous Ni(OH) 2 mesoporous shell creates abundant active sites on the surface, and the conductive CuS out layer promotes electron transportation. This work might open a door for designing and synthesizing of hollow nanomaterials with mesoporous nano-shelled heterostructures consist of amorphous and crystalline phase for applications in electrochemical catalysis and energy conversion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 11
·117501
·
IF 4.386
Zhenhua Liu,Qiangbing Liu,Dan Liao,Jingang Yu,Xinyu Jiang
We have developed a Ni-Al layered double hydroxide (LDH) and carbon black (CB) composite for the selective electrochemical detection of hydroquinone (HQ) and catechol (CT). LDH exhibits multiple active sites and high adsorption capacity for phenolic substances. CB demonstrates high conductivity and electrocatalytic capacity. The crystal structure was characterized by X-ray diffraction, establishing the successful synthesis of flower-like LDH, and the successful combination of LDH and CB. Fourier-transform infrared spectroscopy confirmed that the LDH surface contained sufficient hydroxyl groups to adsorb CT and HQ. The morphology of LDH/CB was characterized by scanning electron microscopy, and the composition and valence confirmed by X-ray photoelectron spectroscopy. The LDH/CB sensor delivered excellent performance in terms of sensing HQ and CT, with a wide detection range (0.1–150 μM) and detection limits of 0.011 and 0.0091 μM (DL = 3.3σ/S), respectively. The excellent performance of this sensor makes it a reliable choice for detecting HQ and CT in water.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Anhua Ren,Min Kang,Xiuqing Fu
This study aimed to evaluate the corrosion behaviour of composite coatings with MoS 2 doping. Herein, the jet electrodeposition technique was used to prepare Ni/WC-MoS 2 composite coatings with different MoS 2 doping concentrations. Then, the composition, morphology, surface contact angle and so on, of coatings’ surfaces were characterised. The corrosion behaviour of the composite coatings with different nano-MoS 2 doping concentrations was investigated in 3.5 wt% NaCl. The corrosion mechanism of composite coatings in the corrosion process was also analysed. Results indicated that the MoS 2 -doped composite coatings had fewer surface micro-defects than Ni/WC coatings. Micro-nano structures such as ‘cauliflower’ and ‘nodules’ occurred on the coating’s surface with MoS 2 doping. As the MoS 2 doping concentration increased, the hydrophobic surface angle of the coating could be increased up to 132.5 °. After the corrosion test in 3.5 wt% NaCl solution, the surface of the composite coating without MoS 2 doping showed severe pitting corrosion. Therefore, the hydrophobicity allowed the Ni/WC-MoS 2 composite coating to offer excellent corrosion resistance with a predominantly uniform corrosion mechanism. The improved corrosion resistance of the composite coatings was attributed to the enhanced surface morphology and hydrophobicity . The more pronounced surface roughness and hydrophobicity helped the coating to trap air and form ‘air pockets’ when in contact with the corrosive medium, thereby blocking the corrosion process of Cl - . The Ni/WC-5 g/L MoS 2 composite coating had more positive corrosion potential ( Ecorr ) than other coatings, with a minimum corrosion current density ( I corr ) and corrosion rate ( CR ) of 0.0193 μA·cm −2 and 2.2446E-4 mm/a, respectively. Thus, the Ni/WC-MoS 2 composite coatings behaved with better corrosion resistance than Ni/WC composite coatings.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Feng Lin,Yulong Ma,Yonggang Sun,Xiuqin Men,Yingbo Zhu,Tingting Gao,Kanghe Zhao
Strategies for catalytic lignin depolymerization to yield ethylbenzene chemicals are green, sustainable and environmentally friendly methods. In this study, a series of Ni-CeO 2 /H-ZSM-5 catalysts were prepared via the precipitation method, which catalytically degraded the β-O-4 chemical bonding structure to yield ethylbenzene chemicals. The 2-(2-methoxy-phenoxy)-1-phenylethanol substance (β-O-4) was selected as a typical lignin model compound for the investigation of the intrinsic depolymerization mechanism and the catalytic performance. The results demonstrated that the introduced CeO 2 active phase can effectively promote the catalytic conversion of the β-O-4 chemical bonding structure to ethylbenzene chemicals. Physicochemical data demonstrate that the reaction pathways and hydrogenation selectivity were effectively regulated and controlled by the tuning of the dehydration and hydrogenolysis processes via the introduction of CeO 2 , which realized the selective adjustment of the redox properties and the surface valence states of active species in the catalytic process due to its excellent oxygen transfer performance.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 9
·1356-1362
·
IF 1.889
Xu Jianxiong,Xie Shaowen,Feng Yahui,Du Jingjing,Xu Lijian
TiO2 nanoparticles with average diameter of 510 nm were prepared by sol–gel surfactants, and the hierarchically nanoporous Ti–SiO2 particles were further prepared using in-situ method. The hierarchically nanoporous Ti–SiO2 particles
with hollow structure were analyzed by transmission electron microscope (TEM), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), nitrogen adsorption stripping curves and Barrett-Joyner-Halenda (BJH) pore size distribution curves. Finally, the hierarchically nanoporous
Ni–Mo composite electrodes were prepared using the TiO2 nanoparticles or nanoporous Ti–SiO2 particles as composite particles respectively, and the influence of the concentration of composite particles on the electrocatalytic activities of Ni–Mo composite
electrodes for hydrogen evolution were investigated by polarization curves. The results showed that the diameter of Ti–SiO2 particles was from 200 nm to 500 nm, and specific surface area was 573 m2/g with pore volume of 1.19 cm3/g and mesopore size of
3.2 nm. The TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes were fabricated by electrodeposition with TiO2 nanoparticles and nanoporous Ti–SiO2 particles as composite particles respectively. The electrocatalytic activities
of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes for hydrogen evolution were investigated. Results showed that the electrocatalytic activities of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes for hydrogen
evolution reached the optimal value when the concentration of particles was 4 g/L and 2 g/L respectively. The electrocatalytic activities of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes were greater than that of Ni–Mo alloy electrode, and
the Ti–SiO2/Ni–Mo composite electrode showed the best electrocatalytic activity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Liang Wang,Jinqiang Zhang,Jun Huang,Qun Cui,Yuezhao Zhu,Haijun Chen
Supported Ni and Ir nanocatalysts have been used in CO2 dry reforming of methane (DRM); however, their fast deactivation limited further applications. In this research, we introduced NiO nanoparticles (NPs) on the SiO2 surface ahead of the addition of the Ir source for the bimetallic Ir–Ni/SiO2 catalyst. The homogeneous NiO NPs provide finite spaces to prohibit the agglomeration of Ir NPs under H2 reduction. The Ir–Ni/SiO2 catalyst was obtained with ultrasmall bimetallic NPs (1.4 nm) uniformly distributed on the SiO2 surface. Owing to the synergistic effects within the bimetal, the catalytic performance on the fabricated bimetallic catalyst into the DRM reaction is significantly enhanced, with 1.2 times higher than the sum of the Ir and Ni monometallic catalysts. Besides, the side reaction of the reverse water–gas shift reaction is effectively suppressed, and the stability is also improved. This facile strategy provides another approach to fabricate ultrasmall and homogeneous bimetallic catalysts for efficient storage and conversion of fossil fuels.
研究领域:
化学工程
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peng Qiu,Lei Wu,Kun Cheng,Shaowen Wu,Huiying Qi,Chunyan Xiong,Baofeng Tu
Fuel flexibility is one of the significant advantages of solid oxide fuel cells (SOFCs). The utilization of methane in SOFCs can not only reduce fuel costs, but also greatly expand its application scenarios, which is of great significance to the commercial development of SOFCs. However, when methane is directly used, Ni-based cermet anode suffers from coking, which seriously affects the durability of the cell. To alleviate the coking issue, a reforming layer outside the Ni-based anode-supporter was proposed in this study, and Ba 0.9 (Zr 0.8 Y 0.2 ) 1- x Ni x O 3-δ (BZYNi x , x = 0.05, 0.1, 0.15 and 0.2) was used as reforming layer material. Among BZYNi x catalysts, BZYNi 0.2 exhibited excellent catalytic activity toward dry reforming of methane, and methane conversion was as high as 85% at 750 °C. The excellent catalytic durability and coking-resistance of BZYNi 0.2 were also confirmed. When BZYNi 0.2 reforming layer was applied, the single cell fueled with CH 4 –CO 2 fuel showed significantly improved electrochemical performance, durability and coking-resistance. The utilization of BZYNi 0.2 reforming layer provides guidance for solving the coking issue of SOFC cermet anodes when fueled with hydrocarbon.
研究领域:
能源材料
·
催化化学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 9
·4694-4703
·
IF 5.503
Zhewen Ma,Qiuyu Zhang,Subrata Panda,Wen Zhu,Fengzhan Sun,Darvaish Khan,Jinjian Dong,Wenjiang Ding,Jianxin Zou
Nano-confinement (NC) of Mg/MgH2 in suitable host materials is a promising strategy for simultaneously tuning the thermodynamics and kinetics of Mg-based hydride materials. In the present study, the fabrication of multifunctional host materials for NC of MgH2 was firstly attempted with the aim of improving the hydrogen sorption properties of MgH2. The NC of MgH2 in the mesoporous structure of a Ni-based metal–organic-framework (denoted as MgH2@Ni-MOF) was successfully conducted via a combination of solvothermal method and wet impregnation method followed by hydrogenation at relatively lower temperatures. Structural inspections through X-ray diffraction and high resolution transmission electron microscopy demonstrate the in situ formation of Mg2NiH4 around the MgH2 nanocrystals (∼3 nm), due to the reaction between Ni ions from the Ni-MOF and Mg ions from the dibutyl-magnesium (MgBu2) precursor in a hydrogen atmosphere. Hydrogen sorption tests reveal that the thermodynamics (−65.7 ± 2.1 and 69.7 ± 2.7 kJ mol−1 H2 for ab-/desorption, respectively) and kinetics (41.5 ± 3.7 and 144.7 ± 7.8 kJ mol−1 H2 for ab-/desorption, respectively) of Mg/MgH2 in the MgH2@Ni-MOF composite have been significantly improved. Meanwhile, the Ni-MOF scaffold acts as an “aggregation blocker” to impede the growth and agglomeration of Mg/MgH2 nanocrystals during hydriding/dehydriding cycles, leading to outstanding hydrogen cycling stability. The improvement in thermodynamics and kinetics of MgH2@Ni-MOF has been attributed to the synergistic “nanosize effect” of nanoconfined Mg/MgH2 and catalytic effects from in situ formed Mg2Ni/Mg2NiH4.
研究领域:
材料科学
·
化学
·
能源存储
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 21
·7200-7216
·
IF 6.119
Hairus Abdullah,Hardy Shuwanto,Dong-Hau Kuo
A Ni–Mg bimetal-doped Zn(O,S) photocatalyst has been synthesized, characterized, and tested for several photocatalytic applications. The hydrogen generation reaction, hydrogenation reaction for chemical transformation, detoxification of hexavalent chromium, and mixed dye (MB + RhB + MO) degradation under simulated solar-light illumination were confirmed. The essential characterization results indicated improved oxygen vacancy sites on the catalyst with enhanced photoresponse, better photocarrier separation, and facile charge transfer properties. A typical catalyst, NMZ-S10, was evaluated with a 1000-cycle CV test to demonstrate its long-term use for industrial application. Stable reusability experiments for the HER, PHR, PHC reaction, and PDM also supported the long-term application. The photocatalytic HER of NMZ-S10 could evolve hydrogen at a rate of 4000 μmol g−1 h−1. 30 ppm azobenzene-to-aniline conversion was completely done in 2 h of reaction. Detoxification of 30 ppm hexavalent chromium was conducted in 70 min of reaction. Finally, 10.5 ppm MB–RhB–MO mixed dye degradation was carried out in 1 h of reaction. The as-synthesized NMZ-S10 catalyst has demonstrated its capability to overcome energy and environmental issues promisingly. The great photocatalytic activities are discussed and elucidated with a plausible mechanism to rationalize the superb catalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhe Liu,Qi Liu,Xuhua Zhang,BingRui Shi,Dandan Qin,Jiaxuan Wang,Aining Zhang,Yongjun Liu
In this study, the sewage sludge was converted into sludge biochar (SBC) and doped with Cu-Ni bimetal to synthesize a novel composite catalyst (Cu-Ni@SBC) for the activation of H 2 O 2 for phenol degradation. Characterization results showed that the Cu-Ni bimetal was successfully doped into the SBC and led to the formation of a porous structure with abundant cavities, resulting in a larger specific surface area and higher adsorbed oxygen content. Mechanism analysis revealed a valence state conversion cycle between Cu 0 -Cu(II), Ni(III)-Ni(II) and Cu-Ni which made Cu-Ni@SBC have higher electron transfer performance. Response surface methodology was applied to determine the optimal preparation and reaction conditions, under which the Fenton-like system composed of Cu-Ni@SBC and H 2 O 2 removed 100 % of phenol and mineralized 69.1 % of TOC from simulated wastewater. In addition, the experimental results showed that the Cu-Ni@SBC material had a relatively wide pH adaptation range (4–8), and the removal efficiency of phenol could reach 76.4 % after 5 cycles of experiments, and the catalytic inhibition rates of the two common coexisting anions, HCO 3 – and Cl - , were 17.1 % and 0 %, respectively. The results of practical application revealed that the phenol removal efficiency reached 90.44 % and the pollutant mineralization rate could reach 58.5 % within 90 min, which proved that the catalyst was suitable for the advanced degradation of organic matter in coal chemical wastewater. Therefore, Cu-Ni@SBC can be considered as a promising Fenton-like catalyst, and the process method is also of some guiding significance for the treatment of coal chemical wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）