Green Energy & Environment
·
2024
·
IF 10.7
Xiaojie Xu,Huachen Lin,Jinrui Ding,Pengjie Zhou,Yulong Ying,Hong Jia,Longhua Li,Yu Liu
Nanostructure engineering and composition rationalization are crucial for materials to become candidates for high-performance supercapacitor. Herein, a novel core-shell heterostructured electrode, combining CoS hollow nanorods with NiCoMn-layered double hydroxides (LDH) ternary metal nanosheets, were prepared on carbon cloth by reasonably controlled vulcanization and electrodeposition. By optimizing electrodeposition conditions, the material's structure and properties can be fine-tuned. The enhanced capacitance of the optimized carbon cloth (CC)@CoS/NiCoMn-LDH-300 electrode (4256.0 F g −1 ) lies in the open space provided by CoS and the establishment of a new charge transfer channel across the interfaces of CC@CoS/NiCoMn-LDH-300 nanosheets. This is further demonstrated by Density functional theory (DFT) simulations based on OH − adsorption energy, which produces faster redox charge kinetics and significantly enhances the electrode's energy storage capacity. The hybrid supercapacitor, integrating the optimized CC@CoS/NiCoMn-LDH-300 electrode with active carbon, demonstrates the highest energy density of 86 Wh kg −1 (under the power density of 850 W kg −1 ) and the long cycle stability of 89.7%. This study aims to go beyond simple binary LDH by constructing a ternary LDH with a hierarchical core-shell heterostructure to provide an effective and feasible new concept for high-performance supercapacitor electrode materials via rational structure design.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yu Tian,Kunlin Li,Fei Wang,Xin Sun,Kai Li,Ping Ning
H 2 O molecules are challenging to dissociate at low temperatures to produce hydroxyl groups for heterogeneous carbonyl sulfide (COS) hydrolysis. Utilizing the inherent hydroxyl groups on Al 2 O 3 surfaces for catalytic COS hydrolysis is effective; however, the relationship between the hydroxyl nature and hydrolysis efficiency remains unclear. In this study, we investigated the effects of crystal structure, surface morphology, specific surface area, and hydroxyl characteristics of Al 2 O 3 on COS hydrolysis efficiency. Results showed that the content, stability, and activity of hydroxyl groups significantly impacted the efficiency. Catalysts prepared from commercial alumina (Al 2 O 3 -C) exhibited superior COS hydrolysis efficiencies under both dry and humid conditions compared to pseudo-boehmite derived Al 2 O 3 (Al 2 O 3 -S) and boehmite derived Al 2 O 3 (Al 2 O 3 -B) owing to the higher, more stable, and active hydroxyl content in Al 2 O 3 -C. Although Al 2 O 3 -S contained a sufficient amount of surface hydroxyl, its lower activity reduced the hydrolysis efficiency. The catalytic COS hydrolysis mechanism over hydroxyl-rich Al 2 O 3 was elucidated through various characterization methods, providing new insights into the correlation between Al 2 O 3 surface hydroxyl properties and COS hydrolysis efficiency.
研究领域:
化学工程
·
催化
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhewen Ma,Subrata Panda,Qiuyu Zhang,Fengzhan Sun,Darvaish Khan,Wenjiang Ding,Jianxin Zou
For the first time, structure-modified CoS-nanoboxes (CoS-NBs) scaffold as a multifunctional Supporting material has been developed by using a template-consumption method for nanoconfinement of MgH 2 particles within its mesoporous structure (denoted as MgH 2 @CoS-NBs). Microstructural observations via transmission electron microscopy (TEM) reveal the uniform distribution of MgH 2 nanocrystals within the mesoporous networks of CoS-NBs scaffold and the surface decoration of MgH 2 crystals by in-situ formed MgS phase. The peculiar core-shell structured morphology of MgH 2 nanocrystals and the “nano-size effect” notably enhances the thermodynamic properties of MgH 2 through the reduction in hydriding and dehydriding enthalpies (−65.6 ± 1.1 and 68.1 ± 1.4 kJ mol −1 H 2 , respectively). Moreover, the improved hydrogen sorption kinetics can be attributed to the catalytic effect of MgS through reducing the intrinsic kinetic energy barriers for both hydriding and dehydriding (57.4 ± 2.2 and 120.8 ± 3.2 kJ mol −1 H 2 , respectively). The “nano-size effect” of nanoconfined Mg/MgH 2 crystals, the catalyzing effect of MgS and the multifunctional role of CoS-NBs scaffold are likely to be synergistically contributed to the superior hydrogen sorption performances of MgH 2 @CoS-NBs composite, as compared to the pure MgH 2 .
研究领域:
材料科学
·
氢气存储
·
纳米技术
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2020
·Vol. 15
·期 9
·1484-1492
·
IF 4.056
Muheng Wang,Yun Wu,Na Li,Fei Zhao,Qiang Zhao,Jinping Li,Guang Liu
Graphical Benefiting from synergistic effects between a NiFe layer and CoS film, the obtained heterostructure CoS@NiFe/NF electrocatalyst displayed excellent oxygen evolution reaction activities at high current densities towards water splitting. Electrochemical water splitting is an ideal pollution-free path to generate hydrogen at large scale, however, the development of highly catalytic electrocatalysts for the water oxidation reaction at large current densities is still a fundamental challenge. Herein, we report a novel, high-wettability water-oxidation electrocatalyst composed of an amorphous NiFe layer and CoS film on commercial nickel foam via a two-step electrodeposition synthetic path. Benefiting from the strong interactions between the NiFe layer and CoS film, enlarged surface active sites and enhanced wettability, the CoS@NiFe/NF electrode exhibited an outstanding water oxidation performance at 10 mA/cm 2 with an overpotential of 175 mV in 1 M KOH solution and steadily delivered a current density of 1 A/cm 2 at merely 330 mV in 30 wt% KOH solution. Even at large densities, the CoS@NiFe/NF hybrids also showed excellent water oxidation stability and corrosion resistance for at least 24 h. Such a synergistic assembling approach to fabricate a CoS@NiFe/NF heterostructure together with excellent OER performance may be a promising strategy for rationally building and designing heterostructural electrocatalysts towards highly efficient water oxidation reaction.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yilei Li,Qing Zhao,Yang Zhang,Yunchao Li,Louzhen Fan,Fa-tang Li,Xiaohong Li
Photocatalysis has been facing challenging problems especially the inefficient photocarriers transfer at the interfaces. Here, based on K sp difference, we prepare the sequential heterojunction of CoS/CdS/CuS via sequential cation exchange strategy, and propose the concept of "electron-welcome zone", where the point-to-point contact can be formed at the interface, thus providing continuous electron transport channels. HAADF-STEM EDS line test indicates the formation of designed structures, and the p/n junction is confirmed by band structure and Mott-Schottky analysis. Theoretical calculation indicates that CoS reduces the Gibbs free energy of the reaction. TRPL spectra show that the existence of "electron welcome zone" greatly improves the lifetime of electrons. This sequential structure enable the optimal H 2 production rate to reach 123.2 mmol g −1 h −1 with AQE of 45.6%, which is among the highest values of CdS-based photocatalysts. This work opens new way to efficient photogenerated carrier transfer channel for solar-energy conversion.
研究领域:
材料科学
·
能源化学
·
催化作用
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Rui Cao,Langlang Wang,Xueqian Wang,Yibing Xie,Xiang Li,Ping Ning
The low-temperature conversion of corrosive carbonyl sulfide (COS) in steel by-product gas is essential for the clean utilization of this gas. Herein, La-Ti@K catalysts doped with La nanoparticles were shown to exhibit significant photopromoted thermocatalytic activity and stability under UV light irradiation. At a reaction temperature of 60 °C, the TOF value increased from 4.84 × 10 -4 s −1 (TiO 2 , thermal treatment) to 8.43 × 10 -4 s −1 (La-Ti@K, photothermal treatment), and the H 2 S selectivity exceeded 99%. This was because La doping increased the density of basic sites on TiO 2 , which promoted the continuous dissociation of H 2 O in the system and the regeneration of –OH under UV irradiation. Moreover, the photogenerated electrons from TiO 2 were transferred to La to maintain the metallic La nanoparticles, as well as to ensure the activation and photothermal hydrolysis of COS. The presence of a suitable electron-metal-support interaction (EMSI) between the electron-rich La nanoparticles and TiO 2 might be responsible for these phenomena. In addition, theoretical calculations revealed that light-induced electron transfer was conducive to H 2 O dissociation and COS activation, while La doping reduced the free energy of the hydrolysis reaction. This work demonstrates the effectiveness of La-Ti@K catalyst in COS photothermal hydrolysis and provides a theoretical basis for further understanding of the photothermal catalytic mechanism.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 10
·4199-4205
·
IF 3.288
Won-Chun Oh,Yin Liu,Kwang Youn Cho,Chong-Hun Jung,Yonrapach Areerob
A novel graphene-Ba2Cu8Ni2Se12 catalyst with CoS nanospheres (GBC) was synthesized via a facile hydrothermal method for use as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). In this work, Ba2Cu8Ni2Se12 (BCNS) and CoS nanospheres were directly grown on graphene sheets showing strong interactions. The morphology and electrochemical and photovoltaic performances of GBC were studied. The GBC CE in bifacial DSSCs showed higher power conversion efficiency (12.37%), which is comparable to that of a traditional Pt electrode (4.07%). This result shown that the synergistic effects of the GBC structure provides a large catalytic active area and an excellent electron transfer pathway. The GBC CE exhibits good device performance and can serve as a low-cost CE as compared to Pt in the DSSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Weijian Xiao,Yuanyuan Li,Yan Zhang,Ping Wang,Ning Qi
The design of a stable and efficient hydrogen evolution catalyst across the entire pH range is of significant importance for the development of hydrogen production technology by electrocatalytic water splitting. This study chose biomass silk fibroin protein as the electrospinning raw material, synthesizing a hybrid membrane of CoS@carbon nanofibers (CNF) with a layered core–shell structure through simple carbonization and hydrothermal treatment. The CoS nanoparticles can grow uniformly and densely on the CNF . By varying the concentrations of hexahydrate cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) and thiourea (CH 4 N 2 S), the morphology of the synthesized CoS nanoparticles on CNF can be controlled. Different microscopic morphologies lead to differences in the activity of the hydrogen evolution reaction (HER), attributed to variations in the exposed active sites for different morphologies. Compared to pure CNF, the CoS-2@CNF hybrid membrane exhibits excellent HER activity in both acidic and alkaline electrolytes. This highlights the synergistic catalytic effect between CNF and CoS particles. This work provides guidance for the rational design of bio-based catalysts with excellent performance.
研究领域:
材料科学
·
能源技术
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Rui Cao,Xueqian Wang,Langlang Wang,Fangxian Cao,Xiang Li,Lu Wang,Jinghao Xiang,Ping Ning
The introduction of surface basic sites to COS hydrolysis catalysts can improve H 2 O activation and COS adsorption, leading to enhanced catalytic performance. However, maximizing the concentration of basic sites remains a challenge due to the limited exposed surface area of these catalysts. Herein, a La/Al 2 O 3 catalyst with abundant alkaline sites to catalyze the hydrolysis of COS was prepared by a simple ammonia-assisted hydrothermal method. This synthesized La/Al 2 O 3 catalyst exhibits a thin rod-like structure formed by the random accumulation of nanoparticles. Lanthanum, one of the most abundant rare earth metals, is an ideal doping aid to further promote the COS-catalyzed hydrolysis performance of Al 2 O 3 . Characterization studies show that the proper lanthanum loading effectively enhances the formation of basic sites, leading to improved lattice oxygen reactivity and –OH adsorption capacity. As a result, the prepared La-loaded Al 2 O 3 nanorod sample with abundant basic sites exhibits nearly 100 % COS conversion and total H 2 S yield at 160 °C. In addition, the reaction pathways and deactivation mechanisms for selective catalytic hydrolysis of COS on the La-doped Al 2 O 3 catalyst were revealed by using in situ DRIFTS to evaluate COS adsorption and hydrolysis. Density functional theory calculations showed that La loading enhances the electron transfer between the La and Al atoms, improves the formation of basic sites, and enhances the adsorption of –OH. This study provides new insights into the design of efficient alumina-based catalysts for the catalytic hydrolysis of COS.
研究领域:
催化化学
·
材料科学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiani Lu,Yinan Wang,Hongda Li,Wei Hu,Guowei Zhou,Bin Sun,Shaonan Gu
Amorphous α-CoS, which has abundant unsaturated active sites, was used to construct Bi 2 MoS x O 6-x /α-CoS crystalline/amorphous S-scheme heterojunction on the crystalline surface of Bi 2 MoS x O 6-x to decompose amoxicillin. Amorphous surface adsorbed amoxicillin and activated it through elongating C−N and C=O bonds. Meanwhile, using S to partial substitute O in the MoO 6 octahedron to tune the band structure of Bi 2 MoS x O 6-x for increasing the visible-light utilization and optimizing the redox capability. Accordingly, the visible light absorbance range was extended to 735 nm with outstanding photo-electronic capabilities. The degradation rate catalyzed by Bi 2 MoS x O 6-x /α-CoS was promoted by two orders of magnitude, much higher than that of most of the reported photocatalysts. Furthermore, LC−MS/MS was employed to precisely track the amoxicillin degradation pathways. It was discovered that by attacking the reactive atoms of S7, N13, O21, C23, and O24 in amoxicillin, free radicals generated a series of intermediates with no apparent toxicity assessed by ecological structural activity relationships.
研究领域:
环境科学
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Xiaoming Zhu,Xiaoyu Jiang,Xiaoling Liu,Lifen Xiao,Xinping Ai,Hanxi Yang,Yuliang Cao
Transition metal sulfides have been proved as promising candidates of anode materials for sodium-ion batteries (SIBs) due to their high sodium storage capacity, low cost and enhanced safety. In this study, the amorphous CoS nanoparticle/reduced graphene oxide (CoS/rGO) composite has been fabricated by a facile one-step electron beam radiation route to in situ decorate amorphous CoS nanoparticle on the rGO nanosheets . Benefiting from the small particle size (~2 nm), amorphous structure, and electronic conductive rGO nanosheets , the CoS/rGO nanocomposite exhibits high sodium storage capacity (440 mAh g −1 at 100 mA g −1 ), excellent cycling stability (277 mAh g −1 after 100 cycles at 200 mA g −1 , 79.6% capacity retention) and high rate capability (149.5 mAh g −1 at 2 A g −1 ). The results provide a facile approach to fabricate promising amorphous and ultrafine metal sulfides for energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 16
·1216
·
IF 4.3
Ting Yang,Aiyi Dong,Weimin Liao,Xun Zhang,Yinhua Ma,Li Che,Honglin Gao
Hydrogen production by the electrolysis of water has become an important way to prepare green hydrogen because of its simple process and high product purity. However, the oxygen evolution reaction (OER) in the electrolysis process has a high overpotential, which leads to the increase of energy consumption. Developing efficient, stable and low-cost electrolytic water catalyst is the core challenge to reduce the reaction energy barrier and improve the energy conversion efficiency. CoS@NiS-80% nanosheets with rich heterogeneous interfaces were successfully synthesized by hydrothermal reaction and sulfuration. Heterogeneous interface not only promotes the effective charge transfer between different materials and reduces the charge transfer resistance but also accelerates the four-electron transfer process through the synergistic effect of nickel and cobalt atoms. Under alkaline conditions, the overpotential of CoS@NiS-80% nanosheets was only 280 mV at a current density of 10 mA cm−2, with a Tafel slope of 100.87 mV dec−1. Furthermore, it could work continuously for 100 h, exhibiting its outstanding stability. This work provides a novel approach for improving the OER performance of transition metal sulfide-based electrocatalysts through heterogeneous interface engineering.
研究领域:
材料科学
·
电化学
·
能量转换
·
纳米材料
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）