JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xiaofang Cao,Mingkai He,Baopeng Ma,Shixuan Liu,Xiaohui Pang,Mingzhen Song,Fudong Zhang,Xiaolian Chao,Zupei Yang,Di Wu
The band degeneracy thus thermoelectric performance of (Fe, Co)Sb 3 based p -type skutterudites can be well modulated by adjusting Co/Fe ratio. Combining systematic experiments and density function theory (DFT) calculations, we revealed in this work that the variation of Co/Fe ratio could result in complicated and mutually coupled effects on the individual thermoelectric parameters (band degeneracy, band gap, Fermi level , filling limit of fillers, phonon spectrum, etc.) and that using Co/Fe ratio to improve the overall thermoelectric figure of merit is nontrivial. We eventually found that the optimal Co/Fe ratio for Mm (Misch metal) filled (Fe, Co)Sb 3 lies at 1.3:2.7, which is somewhat off the Co/Fe = 1:3 point where the largest valence band degeneracy appears. Extra Sb was then introduced to compensate Sb volatilization for improved electrical transport performance. An overall peak figure of merit ZT max of 1.06 was eventually achieved in the sample Mm 0.8 Fe 2.7 Co 1.3 Sb 12.60 , which is among the highest ones for all reported (Fe, Co)Sb 3 based p -type skutterudites so far.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yajie Guo,Kelun Jia,Fei Dai,Yongjie Liu,Chunrui Zhang,Jibo Su,Ke Wang
The progress of inexpensive, high-efficiency, and steady oxygen evolution reaction (OER) electrocatalysts is of great importance to promoting water splitting for green hydrogen production. Herein, tri-metallic NiCoFe selenide catalyst backed up by carbon fiber paper (CFP) was synthesized by a facile selenization of NiCoFe Prussian blue analogues (PBAs) for OER in alkaline solutions. The NiCoFe-Se/CFP inherited the porous nanostructure of the metal-organic frameworks (MOFs) precursors prepared by rapid cyclic voltammetry electrodeposition. Benefiting from the 3D hierarchical porous structure, optimized electronic structure of NiCoFe selenides and high conductivity, the synthesized electrocatalyst exhibits outstanding catalytic activity to the corresponding mono-metallic or bi-metallic selenides. Specifically, the NiCoFe-Se/CFP electrode demands an overpotential of 221 mV to attain the 10 mA cm −2 current density in 1.0 M KOH solution and a low Tafel slope of 38.6 mV dec -1 . The prepared catalyst also displays good stability and durability. These findings prove a feasible strategy to further improve the catalytic activities of non-precious metal based OER electrocatalysts by the cooperation of structure design and chemical component modification.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Pengyao Guo,Xiaomin Hu
To improve the degradation efficiency of g-C 3 N 4 (CN), transition metal elements (Fe and Co) were doped into CN. A novel Co, Fe co-doped CN (Co/Fe-CN) photocatalysts with small size and irregular flake structure were successfully prepared by thermal polymerization of melamine . Co/Fe-CN has a large specific surface area (55.76 m 2 /g), which provides more adsorption sites and reaction sites for the activation of peroxymonosulfate (PMS). Good visible light response performance (474 nm) and suitable band gap (2.83 eV) ensure that it could be excited by visible light. The active species of • O 2 - , 1 O 2 , • OH and SO 4 •- could be stably produced in Co/Fe-CN/Vis/PMS system with appropriate redox potential . Meanwhile, Co and Fe elements doped in CN also could effectively activate PMS and promote the generation of active species. Besides, the continuous generation of photogenerated electrons promoted the cycling of Co 3+ /Co 2+ and Fe 3+ /Fe 2+ , and further enhanced the degradation efficiency of Co/Fe-CN/Vis/PMS towards Levofloxacin (LVFX). LVFX could be rapidly removed, reaching 92.1% within 50 min under visible light illumination, and the kinetic rate constant of LVFX was 0.0638 min -1 . The quenching experiments verified that the 1 O 2 was the main active species in the reaction process. The cycling experiments revealed that the Co/Fe-CN/Vis/PMS system had favorable stability and applicability. This work provides a simple preparation method to fabricate bimetallic co-doped CN for the enhancement of degradation rate in the Photocatalyst/Vis/PMS system.
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ACS Catalysis
·
2022
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IF 13.7
Jing Zhou,Yitian Hu,Yu-Chung Chang,Zhiwei Hu,Yu-Cheng Huang,YaLei Fan,Hong-Ji Lin,Chih-Wen Pao,Chung-Li Dong,Jyh-Fu Lee,Chien-Te Chen,Jian-Qiang Wang,Linjuan Zhang
The oxygen evolution reaction (OER) is of vital importance for electrochemical energy conversion technologies. The use of metal–organic framework (MOF) catalysts after postprocessing is an important method to optimize catalytic activity; however, little attention has been paid to the transformation of the electronic structure and coordinated ions under operando conditions. Here, we focus on a Prussian blue analogue (PBA) with the formula Na2Co2+[Fe2+(CN)6]·nH2O after postprocessing at a temperature of 400 °C. The catalysts exhibit a significant improvement in the OER activity with an overpotential of 254 mV against 320 mV for the initial PBA at 10 mA cm–2 in 1 M KOH. Our ex situ soft X-ray absorption spectroscopy (XAS) results demonstrate that some of the high-spin Co2+ and low-spin Fe2+ ions of PBA exhibit exchange with N and C ligands. Our fast operando hard XAS study revealed a dynamic evolution process of the transformation of ligands from N(C) in the initial Na2Co[Fe(CN)6]·nH2O to oxygen and the formation of pure low-spin Co3+ oxide and high-spin Fe3+ oxide after OER. The amorphous (Co,Fe)OOH chemical state was identified as the catalytically active state based on our operando X-ray spectroscopy results. The results of this study provide insights into a dynamic evolution process of MOFs after postprocessing and the formation of real active sites during electrocatalysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Zhe Li,Shudi Mao,Ying Yang,Zhuo Sun,Ran Zhao
Capacitive deionization (CDI) is considered one of the most promising desalination technologies for obtaining fresh water from saline water. In this work, we synthesized a hollow core–shell Co-MOF@Fe/Co-LDH (Co-Fe-LDH) material by developing a strategy to simultaneously grow Co/Fe-LDH on the surface of a Co-MOF precursor in situ. Owing to the increase in the specific surface area of the hollow structure and the Faradaic process of a layered double hydroxide (LDH), the Co-Fe-LDH material exhibits high electrical double layer (EDL) capacitance and pseudocapacitance, which significantly improves the salt adsorption of the material during CDI (34.2 mg/g in a 600 mg/L NaCl solution at 1.2 V). The adsorption for NaCl in this work is approximately 2.5 times the maximum salt adsorption capacity (SAC) of LDH materials applied in nonmembrane CDI (NMCDI). This work may provide a promising model for the application of hollow LDH materials that exhibit pseudocapacitance in CDI.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Zhihong Du,Yue Gong,Hailei Zhao,Yang Zhang,Sha Yi,Lin Gu
Exsolution of catalytic nanoparticles (NPs) from perovskites has arisen as a flexible method to develop high-performance functional materials with enhanced durability for energy conversion and catalytic synthesis applications. Here, we unravel the interface structure of the in situ exsolved alloy nanoparticles from the double perovskite substrate on the atomic scale. The results show that the Co–Fe alloy NPs exsolved topologically from the {100} facets terminations of the Sr2FeMo0.65Co0.35O6−δ (SFMC) double perovskite along ⟨100⟩ directions exhibiting the same orientation and identical crystal structure. The lattice planes of these two phases align and insert into each other at the interface, forming a smooth and continuous coherent connection. The presence of moiré patterns at the interface confirms the topological exsolution mechanism. The coherent interface can significantly reduce the interfacial energy and therefore stabilize the exsolved nanoparticles. Therefore, excellent and stable electrochemical performance of the NP-decorated SFMC perovskite is observed as the anode for solid oxide fuel cells. Our contribution promotes a fundamental understanding of the interface structure of the in situ exsolved alloy nanoparticles from perovskite substrate.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Hui Wang,Lei Lu,Palaniappan Subramanian,Shan Ji,Palanisamy Kannan
Developing a highly active, low-cost, and durable nanostructured catalytic material is of significant interest in fuel cell applications owing to its efficient energy conversion, ease of preparation and operation, and reduced emission of pollutants. In this work, various ratio (0.01, 0.03, and 0.05 mmol) of cobalt (Co), and iron (Fe) doped nickel hydroxide (Ni(OH) 2 ) nanosheet arrays were grown on Ni foam surface (Co–Ni(OH) 2 and Fe–Ni(OH) 2 ) via a simple one-step process. The Co–Ni(OH) 2 and Fe–Ni(OH) 2 nanosheet array on Ni foam electrodes were explored as potential candidate towards electro-oxidation of urea. Notably, 0.03 mmol Co doped Ni(OH) 2 /Ni foam electrode displayed lowest-onset oxidation potential (0.21 V) and enhanced electro-oxidation of urea (59.7 mA) owing to its large amount of electrocatalytic active sites, densely assembled nanosheet array structures with porous surfaces, and electronic diffusion channels, which might promote interface electrochemical reaction . In addition, synergistic effect between Co metal with Ni(OH) 2 has also promotes enhanced electro-oxidation of urea in contrast to Fe–Ni(OH) 2 nanosheet array, Ni(OH) 2 , and Ni foam electrodes. Chronoamperometric i-t curve of Co–Ni(OH) 2 /Ni foam electrode obviously exhibited higher catalytic current, highly stable and durable properties in contrast to Fe–Ni(OH) 2 nanosheet arrays. As-fabricated Co–Ni(OH) 2 /Ni foam can be explored as a new type of potential low-cost catalyst for electro-oxidation of urea, which reveals promising use in future fuel cell energy applications .
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ACS Omega
·
2024
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IF 3.7
Junhong Liu,Zhitao Liu,Jing Yang,Bin Xu,Feiyun Chen,Xin Liao
The incorporation of nanomaterials generated from Prussian blue (PB) derivatives has emerged as a promising strategy to significantly improve the properties of energetic materials. In this study, we comprehensively investigated the influence of nanomaterials derived from PB on the thermal decomposition characteristics of energetic materials. To achieve this goal, we prepared nanomaterials using coprecipitation and heat treatment methods with PB derivatives as catalysts. Advanced techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller (BET) analysis for specific surface area and pore size, and X-ray photoelectron spectroscopy were employed to thoroughly characterize these nanomaterials. Differential scanning calorimetry was used to assess the thermal behavior of nitrocellulose (NC), and the relevant kinetic parameters were determined through thermal decomposition kinetics calculations and analysis. This work revealed the influence of catalysts on the NC decomposition process and provided comprehensive insights into the effect of integrating nanomaterials derived from PB derivatives on the thermal decomposition performance of NC. The results of this work demonstrated the possibility of using nanomaterials generated from PB derivatives as effective catalysts to enhance the thermal decomposition characteristics of NC, offering interesting opportunities for their application in the field of high-energy materials.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2025
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IF 4.6
Yaqi Wu,Jianhua Qian,Jinjuan Xing,Junhua Li,He Huang,Yanan Wang,Xueming Kang,Lijuan Wang,Jiasheng Xu
Volatile organic compounds (VOCs), as hazardous environmental pollutants emitted from chemical industries, cause significant threats to human health and ecological environment owing to their inherent toxicity and carcinogenicity. Catalytic oxidation has emerged as a promising technology for VOC elimination, enabling complete degradation of pollutants into CO 2 and H 2 O. This study investigates transition metal oxide (TMO x , TM = Mn, Co, Fe, Ni, Cu, Zn)/TiO 2 catalysts for toluene degradation. Since the catalytic efficacy of TiO 2 -based catalysts critically depends on the quantity of surface oxygen vacancy (O v ) in heterogeneous processes, we engineered O v -rich interfaces by breaking atomic periodicity arrangements and generating unsaturated coordination sites. These structural modifications enhanced oxygen migration rates and increased reactive oxygen species availability. Among the synthesized catalysts, CuO/TiO 2 exhibited the highest performance, achieving 90 % toluene conversion (T 90 ) at 286 °C under a weight hourly space velocity (WHSV) of 20,000 mL/(g·h) with an initial toluene concentration of 1000 ppm. The measurement of in-situ DRIFTS suggested that toluene oxidation process abided by the path of toluene → benzaldehyde → benzoic acid → anhydride →CO 2 and H 2 O. Furthermore, the by CuO/TiO 2 catalyst demonstrated great reusability, and long-term stability, highlighting its potential for industrial-scale VOC abatement applications.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2025
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IF 4.6
Yangyang Zhao,Haowei Li,Xiaoyu Wang,Tao Cong,Yijian Wang,Hesheng Zheng,Zhongyi Zhao,Xingchen Feng,Juntao Feng,Pei Wang,Kai Yang,Xifeng Ding
Solid oxide electrolysis cells (SOECs), featuring high current density and Faradaic efficiency, have been extensively recognized for CO 2 electrolysis abilities. However, it is a challenge to find high performance electrode materials with excellent catalytic activity and preferable stability. Herin, hetero-structured perovskite with exsolved Co-Fe nanoparticles is developed via in - situ reduction of the (Ba 0.9 K 0.1 ) 0.9 Co 0.5 Fe 0.4 Nb 0.1 O 3- δ ((BK) 0.9 CFNb). The corresponding SOEC R-(BK) 0.9 CFNb/LSGM/LSCF achieves excellent electrochemical performance with a current density of 0.813 A cm −2 at 1.5 V and 800 °C, which is 30 % higher than the counterpart with untreated (BK) 0.9 CFNb cathode. Its high catalytic activity is attributed to electron feeding effect of in situ exsolved Co-Fe nanoparticles and enhanced CO 2 adsorption with high concentration of oxygen vacancies in perovskite substrate surface. Moreover, the R-(BK) 0.9 CFNb-cell shows much better stability than parent (BK) 0.9 CFNb-cell, which is ascribed to the structural anchoring of the alloy nanoparticles. This study provide an attractive strategy for the future development of SOECs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Zhiliang Zhang,Deyao Xu,Junhua Li,Jinlong Liu,Xuanda Long,Kanda Su,Jiangnan Guo,Haixia Tong,Zeng Liu,Dong Qian
We rationally design and construct a heterostructured hybrid with reduced graphene oxide served as a platform to in-situ grow N-doped bamboo-like carbon nanotubes encapsulating bimetallic Co–Fe sulfide nanoparticles through a two-stage pyrolysis succeeded by an evaporating sulfurization process (denoted as Co x Fe 1- x S 2 @N-CNTs/rGO). By tuning the Co/Fe ratio, the optimal Co 0.6 Fe 0.4 S 2 @N-CNTs/rGO exhibits a remarkable oxygen evolution reaction (OER) performance in 1.0 M KOH, in which the overpotential at 10 mA cm −2 and Tafel slope are recorded as 248 mV ( vs . RHE) and 58.3 mV dec −1 , respectively, outmaneuvring commercial RuO 2 and most Co/Fe sulfide-based catalysts in recent peer reports. Comprehensive experiment results unravel that the outstanding OER electrocatalytic performance owes to the reinforced synergy between CoS 2 and FeS 2 , the heterostructures constituted by partial CoS 2 and FeS 2 , the confining effect of N-CNTs/rGO for CoS 2 and FeS 2 nanoparticles, and the high conductivity and large surface of N-CNTs/rGO.
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Surfaces and Interfaces
·
2023
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IF 6.2
Shiyong Xu,Yijun Wang,Yue Wu,Mei Li
In order to explore the functional application of coal and realize the high-value application of low-quality coal. Therefore, low-cost coal as a carbon source into environmental protection, high-value coal-based carbon quantum dots (CQDs). This study employed high-sulfur coal as the carbon source and urea as the nitrogen source to successfully synthesize nitrogen and sulfur co-doped coal-based carbon quantum dots (NSCQDs) via a one-pot hydrothermal method. These NSCQDs were utilized as co-catalysts to assist the photocatalytic water splitting and hydrogen evolution of metal phosphides (Co-P and Fe-P). The obtained catalysts were subjected to systematic structural and property analyses, and the photocatalytic hydrogen evolution activity and stability were investigated, along with an analysis of the photocatalytic mechanism. The results revealed that the novel composite photocatalyst exhibited high hydrogen evolution activity, with a maximum hydrogen evolution rate of 28.41 mmol·g −1 ·h −1 at pH 10. Under a wavelength of 520 nm, the apparent quantum efficiency (AQE) reached 4.93%, and the solar-to-hydrogen (STH) conversion efficiency reached 0.46%. The semiconductor type (n-type) of the monophasic catalyst was determined through Mott-Schottky analysis, and the band structure was analyzed accordingly. The conduction and valence band positions for Co-P were determined to be -0.44 eV and 1.31 eV, respectively, while those for Fe-P were found to be -0.51 eV and 1.17 eV, respectively. Based on these results, it is inferred that an S-type heterojunction is formed between Co-P and Fe-P, and NSCQDs enhanced photocatalytic hydrogen evolution as an auxiliary catalyst. This research advances the synthesis of coal-based carbon quantum dots and provides the key information for the photocatalytic decomposition of water and hydrogen evolution using coal-based CQDs.
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