INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Lumei Zhang,Chun Han,Zheng Ye,Dongzhe Cui,Junyuan Yang,Hao Xu,Haiyan Song,Zehua Guo,Xiaoliang Wu,Yunhe Zhao
The layered double hydroxides (LDHs) electrocatalysts have emerged as promising electrocatalysts for electrolytic water splitting due to their simple synthesis, high activity. However, traditional LDH-based catalysts face the low electrical conductivity and durability under electrolysis conditions. In this work, Mo–CoFe LDH was prepared by a two-step hydrothermal method, and the effect of different molybdenum content on its catalytic performance was studied. Among them, the OER and HER properties of Mo-CoFe LDH-1 are better than those of non-Mo doping. Mo–CoFe LDH-1 has the low HER and OER overpotentials are 192 mV and 134 mV, respectively at 10 mA cm −2 . In addition, using Mo–CoFe LDH-1 for water splitting can achieve a low voltage of 1.55 V at 10 mA cm −2 , and it also showed a good stability within 100 h. The excellent properties of Mo–CoFe LDH-1 is mainly due to the formation of 3D nanoflower structure and the doping of Mo element in CoFe LDH, significantly adjusting its electronic structure. This work is of great significance for the design of bifunctional LDHs-based electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2020
·Vol. 646
·期 5
·288-295
·
IF 1.24
Yalan Li,Yuandong Wu,Dajiang Mei,Thomas Doert
Three new tin coordination compounds (4,4'-Hbipy) 2 [Sn 2 (C 2 O 4 ) 3 ] ( 1 ), (4,4'-H 2 bipy)[Sn(C 2 O 4 ) 2 ] ( 2 ), and SnCl 2 (4,4'-bipy) ( 3 ) were synthesized under hydro-(solvo-)thermal conditions and their crystal structures were determined by single-crystal X-ray diffraction. Compound 1 exhibits a ionic structure based on discrete [4,4'-Hbipy] + cations and [Sn 2 (C 2 O 4 ) 3 ] 2– anions. These two units are linked via N–H ··· O hydrogen bonds to form a pseudo-one-dimensional zigzag hydrogen-bonded chain. In compound 2 , four-coordinate Sn atoms form monomeric tin dioxalato complexes, which are connected to the doubly protonated [4,4'-H 2 bipy] 2+ cations through N–H ··· O hydrogen bonded to give a one-dimensional zigzag hydrogen-bonded chain. Compound 3 forms a three-dimensional hydrogen-bonded network, in which 1 ∞ [SnCl 2 (4,4'-bipy)] linear chains are interconnected to each other by C–H ··· Cl hydrogen bonding. The solid-state UV/Vis/NIR diffuse reflectance spectroscopy shows that three compounds are broadband semiconductors. The thermogravimetric analysis evidences the thermal stability of the three compounds up to 175, 201, and 246 °C, respectively.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Duchao Zhang,Hongbin Ling,Tianzu Yang,Weifeng Liu,Lin Chen
Electric arc furnace (EAF) dust is a hazardous waste material containing valuable elements, such as zinc (Zn) and iron (Fe), as well as other environmentally harmful elements. In the conventional process, the existence of zinc ferrite (ZnFe 2 O 4 ) in EAF dust results in a low recovery ratio of zinc and can induce high energy consumption or difficulties utilizing iron resources. In this article, a hydrothermal reduction method in a NaOH system is proposed to recover Zn selectively from EAF dust. First, when pure ZnFe 2 O 4 was used as the input material to test the feasibility of the new method, 70% Zn leaching efficiencies and the isolation of Fe in the residue through the formation of ferroferric oxide (Fe 3 O 4 ) were achieved at the optimal conditions of 260 °C, 6 M [NaOH], 10 g/L [C 6 H 12 O 6 ] n and 50 mL/g of L/S. Second, a leaching process of EAF dust was proposed using the following two procedures: (i) first leaching under normal pressure to dissolve zinc oxide (ZnO); and (ii) second leaching of the first leach residue under hydrothermal reduction conditions to dissolve ZnFe 2 O 4 . The leach liquor from the second step was recycled to the first step. Under optimum conditions, the leaching efficiencies of Zn during the first and second leaching were 66.4% and 69.3%, respectively. The total Zn leaching efficiency was calculated to be 89.7%, producing Zn-impregnated leach solution and a leach residue rich in Fe (up to 39.4 wt%) that are suitable as resources for a steel-making plant. However, this process also has its shortcomings owning to larger liquid-solid ratio in the leaching process. Overall, the study technically provides an alternative approach to improve the recycling of zinc and iron and effectively reduce environmental risks from EAF dust.
研究领域:
环境工程
·
冶金工程
·
资源循环利用
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清洁生产技术
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工业废物处理
✓ 已验证
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Linchao Li,Huili Hu,Xiangguo Teng,Yuanchun Yu,Yongming Zhu,Xiaoqiang Su
The aim of this work is to prepare a hydrophobic cathode equipped with quite a few cracks for gas transfer, which can prepare H 2 O 2 in the course of electro-Fenton process. Scanning electron microscopy (SEM) and optical digital microscope are used to characterize the morphology of electrode, and an electrochemical workstation (CHI660e) is used to carry out all electrochemical studies with a conventional three-electrode system. The results demonstrate that the porous electrode is conducive to gas transmission with these cracks which can avoid the formation of bubbles. Additionally, the reaction is almost not affected by the content of dissolved oxygen and the gas flow with this structure. Under the conditions of 300 mA/cm 2 (current density), the H 2 O 2 concentration is up to 14.4 mmol/L after 30 min electrolysis with current efficiency beyond 90%. Furthermore, the cathode is successfully applied to electro-Fenton process which reduced catalyst loading. The results indicate that total degradation of MO is observed at the first 10 min, and 81% of TOC can be removed when the dosage of catalyst is 0.4 mmol/L within 60 min.
研究领域:
环境化学
·
电化学工程
·
水处理技术
·
反应器设计
·
污染物降解
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jing Tang,Xiaoqing Ma,Jing Liu,Shengbiao Zheng,Jianfei Wang
In this study, an electrochemical sensor for the simultaneous detection of hydroquinone (HQ) and catechol (CC) was fabricated on glassy carbon electrode (GCE) modified with graphene quantum dots (GQDs). The prepared GQDs were characterized by transmission electron microscope and fourier transform infrared spectroscopy. The GQDs/GCE, which prepared by electrodeposition method, and characterized by electrochemical impedance spectra, exhibited excellent electrochemical catalysis and conductive properties for HQ and CC. Owing to the high electroactive surface area, good electrocatalytic activity and low charge transfer resistance of GQDs, HQ and CC can be easily measured simultaneously for the large separation of oxidation peak potentials (113 mV) and do not interfere with each other. Under the optimal experimental condition, the oxidation peak currents were linear to HQ/CC in the range from 0.5 μM to 100 μM with the same low detection limits of 0.08 μM (S/N=3). Simultaneous determination of HQ and CC with such electrode was conducted in river water samples with reliable recovery between 97.90% and 103.9%.
研究领域:
分析化学
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电化学
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环境监测
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传感技术
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水污染检测
✓ 已验证
DOI
高影响因子
Small
·
2017
·Vol. 13
·期 32
·1701246
·
IF 8.643
Chunli Wang,Lianshan Sun,Feifei Zhang,Xuxu Wang,Qujiang Sun,Yong Cheng,Limin Wang
Highly uniform hierarchical Mo–polydopamine hollow spheres are synthesized for the first time through a liquid-phase reaction under ambient temperature. A self-assembly mechanism of the hollow structure of Mo–polydopamine precursor is discussed in detail, and a determined theory is proposed in a water-in-oil system. Via different annealing process, these precursors can be converted into hierarchical hollow MoO 2 /C and Mo 2 C/C composites without any distortion in shape. Owing to the well-organized structure and nanosize particle embedding, the as-prepared hollow spheres exhibit appealing performance both as the anode material for lithium-ion batteries and as the catalyst for hydrogen evolution reaction (HER). Accordingly, MoO 2 /C delivers a high reversible capacity of 940 mAh g −1 at 0.1 A g −1 and 775 mAh g −1 at 1 A g −1 with good rate capability and long cycle performance. Moreover, Mo 2 C/C also exhibits an enhanced electrocatalytic performance with a low overpotential for HER in both acidic and alkaline conditions, as well as remarkable stability.
研究领域:
材料科学
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电化学
·
纳米材料
·
能源存储
·
催化化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Junzhe Xu,Shuang Liu,Lin Li,Xian Qin,Ruixin Qu,Jinguo Wang,Di Liu,Gaixia Wei
We synthesized CN11, a carbon nitride material rich in sp 3 hybrid graphitic nitrogen (sp 3 -N), employing a facile oxalic acid-assisted melamine molecular assembly strategy. CN11 promoted the formation of Pd nanoparticles (NPs) predominantly exposing {2 0 0} facets, termed Pd/CN11-2. This facet-specific configuration significantly boosted hydrogen adsorption, leading to notable improvements in catalytic activity. Compared to Pd/XC-72-2 and Pd/g-C 3 N 4 -2, Pd/CN11-2 exhibited a remarkable two-fold and nineteen-fold increase in catalytic yield for hydrazo compound hydrogenation, respectively. Pd/CN11-2 also demonstrated robust performance across a range of reaction conditions, maintaining excellent yield. This study emphasizes the critical role of tailored support structures in controlling Pd NPs facets, thereby enhancing hydrogenation efficiency. It provides valuable insights for advancing the industrial application of Pd-based catalysts, underscoring the importance of strategic support modulation for optimizing catalytic performance.
研究领域:
催化化学
·
材料科学
·
纳米催化
·
有机合成
·
工业催化
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 16
·2766-2775
·
IF 7.411
Yunpeng Liu,Yuhang Li,Siyuan Yang,Yuan Lin,Jiangliang Zuo,Hong Liang,Feng Peng
Reduction is considered to be an effective method to improve the photocatalytic activity of TiO 2 ; however, the underlying relationship between structure and photocatalytic performance has not been adequately unveiled to date. To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 were prepared from CO (CO-TiO 2 ) and H 2 (H-TiO 2 ). For H-TiO 2 , Ti−H bonds and oxygen vacancies are formed on the surface of H-TiO 2 , which results in a more disordered surface lattice. However, for CO-TiO 2 , more Ti−OH bonds are formed on the surface and more bulk oxygen vacancies are introduced; the disorder layer of CO-TiO 2 is relatively thin, owing to most surface vacancies being filled by Ti−OH bonds. Under simulated solar irradiation, the photocatalytic H 2 evolution rate of CO-TiO 2 reaches 7.17 mmol g −1 h −1 , which is 4.14 and 1.50 times those of TiO 2 and H-TiO 2 , respectively. The photocatalytic degradation rate constant of methyl orange on CO-TiO 2 is 2.45 and 6.39 times those on H-TiO 2 and TiO 2 . The superior photocatalytic activity of CO-TiO 2 is attributed to the effective separation and transfer of photogenerated electron–hole pairs, due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds. This study reveals the relationship between the photocatalytic properties and structure, and provides a new method to prepare highly active TiO 2 for H 2 production and environmental treatment. Graphical Turn up the gas ! To obtain insights into the effect of structure on photocatalytic activity, two types of reduced TiO 2 are prepared from CO (CO-TiO 2 ) and H 2 (H-TiO 2 ). CO-TiO 2 exhibits a higher photocatalytic activity than that of H-TiO 2 due to the synergistic effects of oxygen vacancies and surface Ti−OH bonds.
研究领域:
材料科学
·
光催化
·
无机化学
·
能源材料
·
环境治理
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 10
·2515-2522
·
IF 2.799
Zhang Zhenwei,Jiang Xingmao,Hu Jianheng,Yue Chuanjun,Zhang Jintao
Mesoporous nitrogen-doped carbon was synthesized in a controlled manner by a modified deep eutectic solvent method using silica nanoparticles as templates. Various amounts of urea and glucose, which contain hydrogen acceptor and hydrogen bond donor groups were heated and stirred to form homogeneous liquid precursors like deep eutectic solvents, and nitrogen element was uniformly dispersed on an atom scale. Ni-Mo sulfides supported on mesoporous carbon with varying N dopping exhibit excellent hydrodesulfurization (HDS) catalytic performance such as high conversion and good recycling stability in the HDS of dibenzenethiophene. Further investigation showed that a suitable N content in the carbon support enhance the HDS properties and the HDS conversion could reach up to 96%. Graphical
研究领域:
材料化学
·
催化化学
·
纳米材料
·
能源化学
·
环境催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Yu-pei Li,Fa-tang Li,Xiao-jing Wang,Jun Zhao,Jiang-nan Wei,Ying-juan Hao,Ying Liu
A quantum-sized hematite iron oxide (α-Fe 2 O 3 )/graphitic carbon nitride (g-C 3 N 4 ) hybrids have been designed and constructed through a facile in situ calcination treatment. The α-Fe 2 O 3 /g-C 3 N 4 hybrids were analyzed via various characterization techniques including XRD , TEM , UV–Vis DRS , XPS , and their photocatalytic efficiencies were evaluated by visible light-driven hydrogen evolution . The results reveal that the cooperation of α-Fe 2 O 3 and g-C 3 N 4 during fabrication process leads to synergy effects of not only the morphology but also the microstructure. These hybrids exhibit much higher hydrogen evolution efficiency than pure g-C 3 N 4 under visible-light illumination due to their improved light harvesting capability, enhancement of surface areas , predominant (110) facet exposure of α-Fe 2 O 3 as well as a prominent quantum size effect , and highly efficient electron transfer and separation. A proposed Z-scheme mechanism was further verified experimentally.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Xuechao Hu,Junhui Dong
Sulfides existing in many gas mixtures of high temperature cases have a negative effect on various industrial applications. In this study, we present samarium-doped cerium (SDC) sorbent to remove H 2 S at high temperature. Compared with pure CeO 2 , the SDC sorbent shows excellent ability in sulfur removal because of the positive effect of the doping of Sm. The H 2 has a negative influence on sulfidation of the SDC sorbent and significantly shortens the breakthrough time, hence breakthrough sulfur capacity (BSC). The carbon monoxide present in the feed gas has no obvious effect on the sulfur-removal performance. A suitable samarium loading in SDC leads to an optimum interaction between metal oxide species and the surface oxygen vacancies , which results in an optimal adsorbed activity of reduced gas (H 2 , H 2 S) and hence desulphurization performance. In addition, the SDC sorbents have a good regenerated ability by a simple calcination process.
研究领域:
材料科学
·
环境化学
·
能源工程
·
无机化学
·
催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Rui Li,Qiongke Shi,Luyang Zuo,Yingjun Chen,Wenqiang Li,Huitao Fan,Bo Li,Liya Wang
The shortage of fossil energy has become a growing global concern. It is particularly important to make full use of the infinite solar energy resources, and transform them into sustainable and clean energy. The development of hydrogen energy has become a feasible solution to solve the energy shortage problem. The preparation of photocatalysts featuring efficient charge transfer channels and high hydrogen production activity provides a pathway for the development of hydrogen energy. In this paper, we report for the first time the direct assembly of 2D ZnIn 2 S 4 (ZIS) nanosheets on the surface of CoTiO 3 (CTO). The synthesized CoTiO 3 /ZnIn 2 S 4 (CTO/ZIS) photocatalyst features a direct Z-scheme charge transfer channel, which enhances the separation rate of photogenerated carriers, and accelerates the photocatalytic H 2 evolution (PHE) rate. Without the assistance of any co-catalyst, the PHE rate of prepared CoTiO 3 /ZnIn 2 S 4 was as high as 5.21 mmol g −1 h −1 . Moreover, the H 2 evolution rate of CoTiO 3 /ZnIn 2 S 4 almost did not decrease significantly after four consecutive 4 h cycles. This investigation provides a valuable approach for the exploitation of novel and efficient Z-scheme photocatalysts in the application of solar energy to hydrogen energy conversion.
研究领域:
材料科学
·
物理化学
·
能源化学
·
光催化
·
纳米材料
·
可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）