Nanomaterials
·
2022
·Vol. 12
·期 10
·1693
·
IF 5.719
Taifeng Shi,Mengran Chen,Zhenguo Liu,Qingfeng Song,Yixiang Ou,Haoqi Wang,Jia Liang,Qihao Zhang,Zhendong Mao,Zhiwen Wang,Jingyvan Zheng,Qingchen Han,Kafil M. Razeeb,Peng-an Zong
The past decades have witnessed surging demand for wearable electronics, for which thermoelectrics (TEs) are considered a promising self-charging technology, as they are capable of converting skin heat into electricity directly. Bi2Te3is the most-used TE material at room temperature, due to a high zT of ~1. However, it is different to integrate Bi2Te3for wearable TEs owing to its intrinsic rigidity. Bi2Te3could be flexible when made thin enough, but this implies a small electrical and thermal load, thus severely restricting the power output. Herein, we developed a Bi2Te3/nickel foam (NiFoam) composite film through solvothermal deposition of Bi2Te3nanoplates into porous NiFoam. Due to the mesh structure and ductility of Ni Foam, the film, with a thickness of 160 μm, exhibited a high figure of merit for flexibility, 0.016, connoting higher output. Moreover, the film also revealed a high tensile strength of 12.7 ± 0.04 MPa and a maximum elongation rate of 28.8%. In addition, due to the film’s high electrical conductivity and enhanced Seebeck coefficient, an outstanding power factor of 850 μW m−1K−2was achieved, which is among the highest ever reported. A module fabricated with five such n-type legs integrated electrically in series and thermally in parallel showed an output power of 22.8 nW at a temperature gap of 30 K. This work offered a cost-effective avenue for making highly flexible TE films for power supply of wearable electronics by intercalating TE nanoplates into porous and meshed-structure materials.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Yunfei Zhao,Hang Sheng,Jiashun Xi,Tingting Jiang,Dong Wang,Jian Zhang,Zheng Li,Bing Wang,Xiaohui Xu,Haifeng Zhang,Bo Yuan,Runlong Hao,Yi Zhao,Tianhao Wang
In the reaction system with NaBH 4 as a hydrogen donor, inhibiting the formation of hydrogen is the key to promote the efficient catalytic hydrogenation of CO 2 . In this study, nanoscale zero-valent nickel supported on carbon nanofibers (Ni 0 /CNFs) was fabricated as a catalyst for CO 2 hydrogenation in aqueous NaBH 4 solution. The characteristics of Ni 0 /CNFs were examined. By SEM, it was observed that spherical nickel nanoparticles were distributed homogeneously on the surface of strip-shaped carbon nanofibers. EDS mappings indicated that elements were evenly distributed on the catalyst, which might contribute to the uniform exposure of active sites. Via XRD, it was determined that all the diffraction peaks corresponded to the crystal face of nickel metal and that the absence of diffraction peaks of carbon nanofibers indicated that the crystallinity of the carrier was low. XPS study showed that nickel existed on the catalyst surface in two forms: zero valence metal and oxidation state. The effects of catalyst addition amount, NaBH 4 concentration, NaOH dosage, stirring rate on the yield of formate and hydrogen generation rate (HGR) were investigated. By optimizing the above parameters, the concentration of formate reached 150 mmol/L and the hydrogen production rate was 10.55 mL/min. Compared with the non-catalytic conditions, the concentration of formate increased by 57 % and the HGR decreased by 78 %. Moreover, the relationship between CO 2 hydrogenation and NaBH 4 hydrolysis was clarified. This research could enhance comprehension of CO 2 hydrogenation in aqueous NaBH 4 solution and contribute to the development of CO 2 capture and utilization storage technology. The significance of this study lies in clarifying the connection between CO 2 hydrogenation and borohydride hydrolysis in CO 2 catalytic hydrogenation technology.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2019
·
IF 3.315
Qi Sun,Limei Yang,Songtao Huang,Zheng Xu,Yan Li,Wei Wang
Synergistic solvent extraction of nickel by 2-hydroxy-5-nonylacetophenone oxime (Mextral 84H, denoted as HL) mixed with organic acids (denoted as HA) containing neodecanoic acid (Versatic 10) and bis(2-ethylhexyl) phosphoric acid (P204) diluted in aliphatics was comparatively studied. The synergistic effects on nickel with Mextral 84H/Versatic 10 and Mextral 84H/P204 systems were investigated by extraction pH isotherm and equimolar method. The nickel-organic extractants species structure and stoichiometry were determined by slope analysis, Fourier transform infrared (FT-IR) spectrometry and ultraviolet and visible (UV-Vis) spectrometry. The results showed that synergistic effects on nickel with a negligible shift of 0.06 pH units in the Mextral 84H/Versatic 10 system and a significant shift of 0.79 pH units in the Mextral 84H/P204 system were observed compared with single Mextral 84H system. Versatic 10 has little effect on the nickel extraction. The square-planar complex with a formation of Ni L 2 in the Mextral 84H/Versatic 10 system was proposed, the same as that in the single Mextral 84H system. P204 participates in the reaction between nickel and Mextral 84H, probably forming an octahedral complex with a formation of Ni ( H 2 A 2 L 2 ) . The synergistic effect could result from this formation of more stable and hydrophobic nickel adducts, which promote the distribution ratio of nickel.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chen Ling,Zixi Ren,Mengmeng Wei,Fei Tong,Yuwei Cheng,Xiaopeng Zhang,Fuqiang Liu
Inorganic complexants, such as ammonia (AA) and pyrophosphate (PP), are often present alongside heavy metal ions in alkaline plating rinsing wastewater. We investigated the removal capacity of Ni(II) from waters containing [Ni-xNH 3 -yP 2 O 7 ] n complexes by chelating and ion-exchange resins in sole and dual-ligand systems. D463 (containing iminodiacetic groups) and PAMD (possessing polyamine groups) exerted superior performance under all conditions. Ni(II) adsorption on D463 decreased with AA and PP by 10.3% and 64.4%, respectively. Conversely, the adsorption on PAMD increased by 57.3% and 75.8%, respectively. PAMD exhibited high selectivity toward anionic [Ni-PP] species over free PP. More Ni(II) was captured by PAMD in the dual-ligand systems than sole systems, while the case for D463 was opposite. As confirmed by species tracking and DFT/XPS analyses, complexes breaking-Ni 2+ capture was the dominant mechanism for D463, while the dual-site (non-charged and protonated amines) interactions with NiP 2 O 7 2– on PAMD promoted its adsorption. The tandem combination D463-PAMD was the optimal mode to remove the most Ni(II). The actual wastewater test demonstrated that >210 BV effluent met the limit of 0.1 mg Ni(II)/L and the eluent contained 15 g Ni(II)/L. This study guides the application of chelating adsorption processes in the advanced treatment of plating rinsing wastewaters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
iScience
·
2023
·
IF 5.8
Ying Zhang,Yuying Wan,Xiaoxu Liu,Kai Chen,Ke Chu
Electrocatalytic reduction of nitrite to ammonia (NO 2 RR) is considered as an appealing route to simultaneously achieve sustainable ammonia production and abate hazardous nitrite pollution. Herein, atomically Nb-doped NiO nanoflowers are designed as a high-performance NO 2 RR catalyst, which exhibits the highest NH 3 -Faradaic efficiency of 92.4% with an NH 3 yield rate of 200.5 μmol h -1 cm -2 at -0.6 V RHE. Theoretical calculations unravel that Nb dopants can act as Lewis acid sites to render effective NO 2 - activation, decreased protonation energy barriers, and restricted hydrogen evolution, ultimately leading to a high NO 2 RR selectivity and activity.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 8
·1347
·
IF 5.719
Wen Jiang,Lingling Dong,Shuanghui Liu,Shuangshuang Zhao,Kairu Han,Weimin Zhang,Kefeng Pan,Lipeng Zhang
Lithium-sulfur batteries exhibit great potential as one of the most promising energy storage devices due to their high theoretical energy density and specific capacity. However, the shuttle effect of the soluble polysulfide intermediates could lead to a severe self-discharge effect that hinders the development of lithium-sulfur batteries. In this paper, a battery separator has been prepared based on NiFe2O4/Ketjen Black (KB) modification by a simple method to solve the shuttle effect and improve the battery performance. The as-modified separator with the combination of small-size KB and NiFe2O4nanoparticles can effectively use the physical and chemical double-layer adsorption to prevent polysulfide from the shuttle. Moreover, it can give full play to its catalytic effect to improve the conversion efficiency of polysulfide and activate the dead sulfur. The results show that the NiFe2O4/KB-modified separator battery still maintains a discharge capacity of 406.27 mAh/g after 1000 stable cycles at a high current density of 1 C. Furthermore, the coulombic efficiency remains at 99%, and the average capacity attenuation per cycle is only 0.051%. This simple and effective method can significantly improve the application capacity of lithium-sulfur batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yu Qiu,Enkang Fu,Feng Gong,Rui Xiao
Ammonia is a prospective fuel for hydrogen storage and production, but its application is limited by the high cost of the catalysts (Ru, etc. ) to decompose NH 3 . Decomposing ammonia using non-precious Ni as catalysts can therefore improve its prospects to produce hydrogen. This work proposes several Ni/MgAl 2 O 4 with the support properties tuned and investigates the support effect on the catalytic performance. Ni/MgAl 2 O 4 -LDH shows high NH 3 conversion (∼88.7%) and H 2 production rate (∼1782.6 mmol g −1 h −1 ) at 30,000 L. kg −1 h −1 and 600 °C, which is 1.68 times as large as that of Ni/MgAl 2 O 4 -MM. The performance remains stable over 30 h. The characterizations manifest that the high specific surface area of Ni/MgAl 2 O 4 -LDH can introduce highly dispersed Ni on the surface. Kinetics analysis implies promoted NH 3 decomposition reaction and alleviated H 2 poisoning for Ni/MgAl 2 O 4 -LDH. A roughly linear relationship is obtained by fitting the curves of dispersed Ni on the surface vs the reaction orders regarding H 2 and NH 3 . This indicates that enhanced NH 3 decomposition performance can be ascribed to the strengthened NH 3 decomposition reaction and weakened H 2 poisoning by the highly dispersed Ni on the MgAl 2 O 4 -LDH surface. This work provides an opportunity to develop highly active and cost-effective catalysts to produce hydrogen via NH 3 decomposition.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2014
·Vol. 7
·期 10
·2889-2897
·
IF 7.117
Yong Yang,Mei Wang,Liqin Xue,Fengbo Zhang,Lin Chen,Mårten S. G. Ahlquist,Licheng Sun
Graphical Nickel is the answer: A noble-metal-free molecular system that comprises a Ni complex that bears internal bases, fluorescein as a cheap light harvester, and triethylamine, displays a turnover number up to 3230 in H 2 evolution in aqueous solutions. A Ni complex with internal bases that contain bipyridine-derived ligands, [Ni(L) 2 (H 2 O) 2 ](BF 4 ) 2 ([ 1 ](BF 4 ) 2 , L=2-(2-pyridyl)-1,8-naphthyridine), and a reference complex that bears analogous bipyridine-derived ligands but without an internal base, [Ni(L′) 3 ](BF 4 ) 2 ([ 2 ](BF 4 ) 2 , L′=2-(2-pyridyl)quinoline), were synthesized and characterized. The electrochemical properties of these complexes were studied in CH 3 CN, H 2 O, and a mixture of EtOH/H 2 O. The fluorescence spectroscopic studies suggest that both dynamic and the sphere-of-action static quenching exist in the fluorescein Fl 2− /[ 1 ] 2+ and Fl 2− /[ 2 ] 2+ systems. These noble-metal-free molecular systems were studied for photocatalytic H 2 generation. Under optimal conditions, the turnover number of H 2 evolution reaches 3230 based on [ 1 ] 2+ , whereas [ 2 ] 2+ displays only approximately one third of the turnover of [ 1 ] 2+ . A plausible mechanism for the catalytic H 2 generation by [ 1 ] 2+ is presented based on DFT calculations.
研究领域:
化学
·
可再生能源
·
催化科学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Wanqi Zhao,Panpan Lin,Tiesong Lin,Peng He,Weimin Long,Ruyu Tian
Owing to the isothermal solidification of eutectic Au-Si filler, GH3039 joints were successfully manufactured at 430 °C. After Ti modified, GH3039 joints that could endure 800 °C were creatively achieved through the transformation of reaction layers. Dispersed Ni 49 Ti 14 Si 37 whiskers and CrSi 2 fine particle layer formed at the interface instead of continuous Ni 3 Si layer. This improved the joint shear strength to 131 MPa at room temperature and 15 MPa at 800 °C. Joining at low temperature but applying at high temperature offers a new option for the dissimilar bonding of Ni-based superalloy and ceramics that is in need of the residual stress alleviation.
研究领域:
材料科学
·
焊接工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Xiaohua Jing,Zhumei Sun,Dandan Zhao,Xiaoning Tang,Wenjing Lv,Yunfeng Shi
In this study, five novel ionic liquids denoted by [RNH 3 ][Cyanex 272] where R = C 4 H 9 , C 6 H 13 , C 8 H 17 , C 10 H 21, and C 12 H 25 were synthesized in a one-step reaction of straight-chain primary amines and Cyanex 272. The singe-stage extraction performance of [RNH 3 ][Cyanex 272] for the separation of Mn 2+ , Co 2+ , Ni 2+ and Li + was investigated. Compared with the other [RNH 3 ][Cyanex 272], the [C 4 H 9 NH 3 ][Cyanex 272] has good selective extraction and separation of Mn 2+ , Co 2+ , and Ni 2+ due to the smaller different value between the radius of metal ion and the radius of [C 4 H 9 NH 3 ] + . Using a three-stage cross flow extraction, the extraction percentages of Mn 2+ , Co 2+ , Ni 2+ , and Li + were about 99.4, 99.1, 14.9 and 0.9 %. The [C 4 H 9 NH 3 ][Cyanex 272] is a good extraction agent for co-extraction of Mn 2+ , Co 2+ , and a part of Ni 2+ from Li + based on a three-stage cross flow extraction. Diluted sulfuric acid was used to strip the organic phase containing Mn 2+ , Co 2+ , and Ni 2+ , and the aqueous phase containing Mn 2+ , Co 2+ , and Ni 2+ can be used for the preparation of ternary precursor materials. The precipitation method can be used to prepare Ni(OH) 2 and Li 2 CO 3 from an aqueous phase containing Ni 2+ and Li + . The conceptual recycling flow-sheet for Mn 2+ , Co 2+ , Ni 2+ , and Li + from spent ternary lithium batteries was presented on basis of the new extraction agent. The slope method was also used to investigate the mechanism of the extractive reaction of Mn 2+ , Co 2+ , and Ni 2+ using the [C 4 H 9 NH 3 ][Cyanex 272].
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Mingxin Zhang,Cuiying Pei,Qi Wang,Yi Zhao,Changhua Li,Weizheng Cao,Shihao Zhu,Juefei Wu,Yanpeng Qi
Recently, the discovery of superconductivity with a critical temperature T c up to 80 K in Ruddlesden–Popper phases La n +1 Ni n O 3 n +1 ( n = 2) under pressure has garnered considerable attention. Up to now, the superconductivity was only observed in La 3 Ni 2 O 7 single crystal grown with the optical-image floating zone furnace under oxygen pressure. It remains to be understood the effect of chemical doping on superconducting La 3 Ni 2 O 7 as well as other Ruddlesden–Popper phases. Here, we systematically investigate the effect of external pressure and chemical doping on polycrystalline Ruddlesden–Popper phases. Our results demonstrate that the application of pressure and doping effectively tunes the transport properties of Ruddlesden–Popper phases. We find pressure-induced superconductivity up to 86 K in La 3 Ni 2 O 7 polycrystalline sample, while no signatures of superconductivity are observed in La 2 NiO 4 and La 4 Ni 3 O 10 polycrystalline samples under high pressure up to 50 GPa. Our study sheds light on the exploration of high- T c superconductivity in nickelates.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Ziqiang Wang,Zechuan Dai,Hongjie Yu,Hugang Zhang,Wenjing Tian,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Electrochemical ammonia synthesis is considered as an alternative sustainable method to the traditional Haber–Bosch process because of the reduced energy consumption and mild operation conditions. The key is to design efficient electrocatalysts for facile adsorption and activation of nitrogen. Herein, a nanoporous Pd film with a tunable pore size has been in situ grown on Ni foam (nPd/NF) via a micelle-assisted replacement method using NF as a reductant and substrate, where polystyrene-b-poly(ethylene oxide) and 1,3,5-triisopropylbenzene serve as a pore-forming agent and a swelling agent, respectively. Combining the continuous large nanoporous structure and self-supported properties, the obtained nPd/NF exhibits excellent catalytic performance for ammonia synthesis with a high NH3 yield of 18.27 μg h–1 mgcat–1 and a faradaic efficiency of 10.36% in 0.1 M Na2SO4. This work provides a fascinating route for the rational design of self-supported porous noble metals with a tunable pore size for effective electrosynthesis of ammonia.
研究领域:
材料科学
·
电化学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）