HYDROMETALLURGY
·
2020
·
IF 3.338
Xintao Yi,Guangsheng Huo,Wei Tang
The extraction of Fe(III), Ni(II) and Co(II) from a Ni(II)-Co(II) solution containing Fe(III) was analyzed in a chloride medium using a mixed extractant consisting of 50% ( v /v) tributyl phosphate (TBP), 20% (v/v) 2-octanol and 30% (v/v) kerosene. The extraction of 0.5 mol/L Fe(III) in 4 mol/L hydrochloric acid reached 97%, and the consumption of chloride ions was investigated. Nickel(II) ions were not detectably extracted by TBP, with an inclusion of <1.1%. Compared with Fe(III), TBP extracted only a small amount of Co(II). The iron complexes formed by TBP and 2-octanol were [H 2 FeCl 4 · 2TBP] and [H 2 FeCl 4 · 5(2-octanol)], and the possible compositions of Co-containing extracts were [H 2 CoCl 4 · 2TBP] and [H 2 CoCl 4 ] · n[2-octanol]. An industrial process consisting of two-step extraction was designed to achieve the separation of Co(II) and Fe(III), resulting in a decrease in the Fe/Co mass ratio from 0.46 to <3.5 × 10 −4 in the raffinate.
研究领域:
化学工程
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Bolang Li,Fei Wang,Kai Li,Ping Ning,Min Chen,Changbin Zhang
The chemical transformation of CO 2 produces carbon compounds that can be used as precursors for the production of chemicals and fuels. Here, we investigated the activity and selectivity of the transition metals (Fe, Co, and Ni) supported on CeO 2 catalyst for CO 2 hydrogenation at atmospheric pressure. We found that Ni/CeO 2 shows the highest CO 2 conversion compared with Fe/CeO 2 and Co/CeO 2 . Besides, Co/CeO 2 and Ni/CeO 2 exhibit nearly 100% CH 4 selectivity while Fe/CeO 2 inclines to produce CO. The characterization results show that the metal-support interaction order is Fe/CeO 2 > Co/CeO 2 > Ni/CeO 2 , the weak metal-support interaction over Ni/CeO 2 benefits the activation of H 2 and then promotes the activity of CO 2 hydrogenation. Additionally, in situ DRIFTS results demonstrate that monodentate formate species rather than bidentate formate are the active intermediates. The main route of CO 2 hydrogenation to CH 4 is that CO 2 is firstly transformed to m-HCOO∗ and then direct hydrogenation of the m-HCOO∗ to CH 4 . This study provides insights into the understanding of the mechanisms of CO 2 hydrogenation on CeO 2 based catalysts.
研究领域:
催化化学
·
材料科学
·
环境科学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 22
·15547-15554
·
IF 3.3
Changyin Zhong,Yifei Yang,Yun Fang,Jun Chen,Bomin Feng,Hongbing Wang,Wenhua Luo,Yunxi Yao
Lanthanum oxide (La2O3) possesses superior reactivity during catalytic hydrogenation, but the intrinsic activity of La2O3 toward H2 adsorption and activation remains unclear. In the present work, we fundamentally investigated hydrogen interaction with Ni-modified La2O3. Hydrogen temperature programmed desorption (H2-TPD) on Ni/La2O3 shows enhanced hydrogen adsorption with a new hydrogen desorption peak at a higher temperature position compared to that on the metallic Ni surfaces. By systematically exploring the desorption experiments, the enhanced H2 adsorption on Ni/La2O3 is due to the oxygen vacancies formed at the metal–oxide interfaces. Hydrogen atoms transfer from Ni surfaces to the oxygen vacancies to form lanthanum oxyhydride species (H–La–O) at the metal–oxide interfaces. The adsorbed hydrogen at the metal–oxide interfaces of Ni/La2O3 results in improved catalytic reactivity in CO2 methanation. Furthermore, the enhanced hydrogen adsorption on the interfacial oxygen vacancies is ubiquitous for La2O3-supported Fe, Co, and Ni nanoparticles. Benefiting from the modification effect of the supported transition metal nanoparticles, the surface oxyhydride species can be formed on La2O3 surfaces, which resembles the recently reported oxyhydride observed on the reducible CeO2 surfaces with abundant surface oxygen vacancies. These findings strengthen our understanding of the surface chemistry of La2O3 and shed new light on the design of highly efficient La2O3-based catalysts with metal–oxide interfaces.
研究领域:
催化
·
表面化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xin Liu,Liping Yang,Li Chen,Shuxia Li,Peng Li,Yongrong Sun,Ning Kang,Chenglong Wang
It is still challenged to propose a straightforward and in-situ growth method of fabricating perovskite-type metal oxide films with dense and uniform surface coverage. This paper presents a simple strategy to prepare LaBO 3 (where B = Ni, Co, Fe, Mn) films by metal oleate (MO) route, in which metal oleates (La(OA) 3 and (B(OA) x , x = 2 or 3) serve as effective ligands to inhibit the self-aggregation among crystal grains. The as-prepared LaNiO 3 film with uniform and dense surface shows a reduced contact angle (31.5° vs 51.2°) and surface roughness (Ra = 14.2 vs 23.9 nm) compared with film prepared by Sol-gel (SG) method. Finally, the LaNiO 3 film by MO route is successfully employed as hole transport layer (HTL) in perovskite solar cells (PSCs) to obtain a power conversion efficiency (PCE) up to 15.62 %, which is 1.54 times that of PSCs by SG method. This work opens an avenue for fabricating LaBO 3 films with dense and uniform surface coverage by MO route.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 27
·1700886
·
IF 12.124
Yecan Pi,Qi Shao,Pengtang Wang,Jun Guo,Xiaoqing Huang
The development of bifunctional electrocatalysts for overall water splitting in acidic media is vital for polymer electrolyte membrane (PEM) electrolyzers, but still full of obstacles. Here, highly efficient acidic overall water splitting is realized by utilizing ultrasmall, monodispersed Iridium (Ir)-based nanoclusters (NCs) as the candidate, via a surfactant-free, wet-chemical, and large-scalable strategy. Benefiting from the high specific surface area, clean surface, and strong binding between NCs and supports, the IrM NCs exhibit attractive activities and durability for both oxygen evolution reaction and hydrogen evolution reaction in acidic electrolytes, with IrNi NCs showing the best performance. More significantly, in the overall water splitting, IrNi NCs reach 10 mA cm −2 at a cell voltage of only 1.58 V in 0.5 m H 2 SO 4 electrolyte, holding promises for potential implementation of PEM water electrolysis. This work opens a new avenue toward designing bifunctional “acidic stable” catalysts for efficient overall water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Shanhai Zhao,Chunhe Li,Kuankuan Ren,Zebo Fang,Ping Fang,Yanyan Zhu,Pengfei Fang
Photothermal catalytic CO 2 reduction is an attractive way to alleviate the current energy crisis, but it is important to prepare catalysts with efficient catalytic capacity. In this work, Prussian blue analogs were firstly prepared, and then calcined to obtain porous transition metal (Ni, Co, Fe) oxides (TMOs). The metal composition of catalysts has great influences on their structures and catalytic properties. Among them, NCF-TMO catalyst shows excellent photothermal catalytic performance, and can produce 2.9 mmol g -1 h -1 CO and 1.6 mmol g -1 h -1 mmol CH 4 at low CO 2 and H 2 concentrations. For the NCF-TMO, its superior catalytic performance mainly benefitted from two reasons: (1) The construction of heterojunction between NiO, Co 3 O 4 and Fe 2 O 3 , which promotes the efficient dynamic processes of charge carriers; (2) The formation of abundant surface reactive active sites facilitates the efficient conversion of CO 2 molecules. This study offers a bright direction for the resource utilization of CO 2 .
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Lixin Wang,Renjie Ji,Chunge Wang,Fanbo Meng,Zhongwu Luo,Mengran Wang,Hui Jin,Shijie Yang,Shi’an Zhao,Dahao Han,Yongjie Cheng,Tianyu Liu,Jianmin Ma,Yonghong Liu
To address the limited activity and durability of oxygen evolution reaction (OER) electrocatalysts, we present an integrated in situ strategy for constructing a three-dimensional Ni-Co dendritic electrode matrix coupled with a surface amorphous Ni-Co-Fe layered double hydroxide (LDH) catalytic layer. A Ni-Co dendritic matrix (NCDEM) with enhanced electrolyte accessibility and mass transport properties is first fabricated via jet electrodeposition, followed by the in situ hydrothermal growth of Ni-Co-Fe LDH nanosheets to construct a Ni-Co-Fe dendritic electrode (NCFDE). The introduction of NaBO₂ during the hydrothermal process regulates surface etching kinetics and the Fe³ ⁺ coordination environment, promoting uniform nanosheet growth and triggering the crystalline-to-amorphous transition of the LDH structure. The amorphous LDH layer increases the accessible active surface area, facilitates the formation of reconstructed NiOOH active species during OER, and enhances structural stability during prolonged electrochemical operation. The optimized B2-NCFDE exhibits outstanding OER performance in 1 M KOH, requiring an overpotential of only 215.34 mV to achieve 100 mA cm⁻², with a Tafel slope of 38.29 mV dec⁻¹ and stable operation at 500 mA cm⁻² for 2000 h. Furthermore, the B2-NCFDE||B2-NCFDE electrolyzer achieves 100 mA cm⁻² at a cell voltage of 1.822 V and demonstrates excellent durability for overall water splitting. This work provides a scalable strategy that integrates electrode architecture engineering with amorphous LDH regulation for efficient and durable hydrogen production.
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DOI
高影响因子
CATALYSIS LETTERS
·
2014
·Vol. 144
·期 6
·1001-1008
·
IF 2.291
Lin Chao,Tao Kai,Hua Dayin,Ma Zhen,Zhou Shenghu
Abstract Bimetallic Au 3 M (M = Ni, Co, Fe) nanoparticles (NPs) were synthesized by reducing a mixture of Au 3+ and metal cations (Ni 2+ , Co 2+ , Fe 3+ ) by butyllithium in the presence of oleylamine. Au 3 M NPs were then deposited onto a commercial SiO 2 support. The Au 3 M/SiO 2 samples were not particularly active in the catalytic reduction of p -nitrophenol unless they were converted into Au–MO
x
/SiO 2 after appropriate thermal treatment in air. The Au–MO
x
/SiO 2 catalysts showed good thermal stability and significantly higher p -nitrophenol conversions than Au/SiO 2 . Relevant characterization was conducted employing X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy, and ultraviolet–visible spectroscopy. Graphical Abstract
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2015
·Vol. 145
·期 3
·784-793
·
IF 2.307
Zhang Xuejun,Zhang Peipei,Yu Hongbo,Ma Zhen,Zhou Shenghu
Abstract Bimetallic PdM (M = Ni, Co, Fe) nanoparticles were synthesized using butyllithium as a reductant, and were used to prepare Pd–M
x
O
y
/KIT-6 catalysts by appropriate oxidation and reduction treatments. These catalysts showed higher selectivity in the hydrogenation of p -chloronitrobenzene to p -chloroaniline than Pd/KIT-6. Relevant characterization was conducted using X-ray diffraction, transmission electron microscopy, N 2 adsorption–desorption, X-ray photoelectron spectroscopy, inductive coupled plasma emission spectrometer, and H 2 temperature-programmed reduction. Graphical Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shanhai Zhao,Yidan Luo,Chunhe Li,Kuankuan Ren,Yanyan Zhu,Weidong Dou
The synthesis of renewable fuel by CO 2 reduction is a promising research direction. The CO 2 reduction reaction may be promoted using photothermal catalysis to achieve efficient CO 2 conversion under mild conditions. In this context, designing efficient catalysts is urgent. In this work, ABO 3 (A = La, Ce; B = Ni, Co, Fe) perovskite catalysts were prepared by coprecipitation and calcination . Experimental results show that the A-site ions and B-site ions in ABO 3 perovskite nanomaterials have a great influence on their structure and photothermal catalytic performance. Among them, the LaNiO 3 catalyst shows excellent photothermal catalytic performance in the conversion of CO 2 to CO and CH 4 , which can generate 0.16 mmol g −1 h −1 CO and 1.38 mmol g −1 h −1 CH 4 at low CO 2 and H 2 concentrations. For the LaNiO 3 sample, its enhancement of catalytic performance mainly benefits from the largest number of active sites, the fastest carrier transport rate, and a relatively suitable band edge position compared with other catalysts. This study proposes a new method for improving the activity and selectivity of photothermal CO 2 reduction and offers a new direction for the recycling of waste gas.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
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.
研究领域:
材料科学
·
化学工程
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
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.
研究领域:
材料科学
·
电化学
·
能源催化
✓ 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）