RSC Advances
·
2018
·Vol. 8
·期 13
·7269-7279
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IF 2.936
Junyu Fan,Zhiwei Zhao,Zhaoxia Ding,Jie Liu
In this study, different crystalline structures of FeOOH have been prepared. α-FeOOH was synthesized through a hydrothermal method, whereas β-FeOOH was synthesized via a direct hydrolysis method. Moreover, γ- and δ-FeOOH were prepared by precipitation methods through slow and quick oxidation, respectively. On this basis, their crystal structure, morphology, and surface area were measured. Then, all the synthesized materials were applied to activate peroxymonosulfate (PMS) to generate sulfate radicals (SO4−˙) for acid orange 7(AO7) degradation. Compared with α-FeOOH, β-FeOOH, and γ-FeOOH, δ-FeOOH showed more efficient decolorization of AO7 in the catalytic system because of its abundant surface area and crystalline structure. The effects of several parameters in the δ-FeOOH/PMS/AO7 system were investigated. The results show that the initial pH, which is related to the features of surface hydroxyl groups, is the decisive factor, and excellent catalytic activity is maintained in the pH range 5–8. The increase of catalyst dosage and appropriate increase of PMS concentration contributed to promote the degradation effect. However, self-quenching was observed in a high PMS concentration system. Moreover, δ-FeOOH was stable after six consecutive cycles, and the leaching of iron ions was negligible. According to the quenching test and electron spin resonance analysis, both SO4−˙ and ˙OH were the dominant radicals for AO7 degradation.
研究领域:
环境科学
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催化
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水处理
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 13
·2215
·
IF 5.719
Huijun Song,Jingjing Li,Guan Sheng,Yinling Zhang,Ahmad Azmin Mohamad,Juan Luo,Zhangnan Zhong,Wei Shao
The oxygen evolution reaction (OER) occurs at the anode in numerous electrochemical reactions and plays an important role due to the nature of proton-coupled electron transfer. However, the high voltage requirement and low stability of the OER dramatically limits the total energy converting efficiency. Recently, electrocatalysts based on multi-metal oxyhydroxides have been reported as excellent substitutes for commercial noble metal catalysts due to their outstanding OER activities. However, normal synthesis routes lead to either the encapsulation of excessively active sites or aggregation during the electrolysis. To this end, we design a novel core–shell structure integrating CoMoO4as support frameworks covered with two-dimensional γ-FeOOH nanosheets on the surface. By involving CoMoO4, the electrochemically active surface area is significantly enhanced. Additionally, Co atoms immerge into the γ-FeOOH nanosheet, tuning its electronic structure and providing additional active sites. More importantly, the catalysts exhibit excellent OER catalytic performance, reducing overpotentials to merely 243.1 mV a versus 10 mA cm−2. The current strategy contributes to advancing the frontiers of new types of OER electrocatalysts by applying a proper support as a multi-functional platform.Keywords:γ-FeOOH nanosheets;CoMoO4@γ-FeOOH heterojunction;oxygen evolution reaction
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 5
·1-11
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IF 2.8
Li Yingying,Tang Xingyue,Li Boyang,Luo Yani,Wang Yijing,Wang Xiaolian
Metal-organic frameworks (MOFs) have emerged as promising catalysts for the oxygen evolution reaction (OER) in water electrolysis. This study synthesizes a nickel-based MOF on a nickel foam substrate (NiMOF/NF) via a solvothermal method and fabricates NiMOF-FeOOH/NF composites through Fe electrodeposition. The NiMOF-FeOOH 600 /NF composite, prepared with a 600 s electrodeposition time, exhibits an overpotential of 320 mV at 20 mA·cm -2 and a Tafel slope of 126 mV·dec -1 . Compared to unmodified NiMOF/NF, the overpotential was reduced by 320 mV and the Tafel slope by 146 mV dec -1 . In addition, no significant performance degradation was observed during the 40 h stability test. Further results demonstrated that deposition of Fe ions significantly improved the intrinsic conductivity of NiMOF/NF, enabling more efficient charge transfer during the OER process. Additionally, the modified FeOOH surface morphology increased the number of accessible active sites and enhanced the exposure of catalytic centers. In summary, these structural and electronic modifications synergistically improve the overall catalytic performance and have guiding significance for the application of MOF to OER.
研究领域:
材料科学
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电化学
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催化剂研究
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Hongwei Pan,Xin Zhang,Yubao Jia,Yao Zhang,Zhigang Jiang,Caixia Sun,Xu Li,Lei Zhu,Kuikui Wang
Electronic structure regulation is one of the essential strategies for developing advanced electrocatalysts . Herein, FeOOH was electrodeposited on the surface of NiSe 2 /Ni 2 O 3 , resulting in a layered NiSe 2 /Ni 2 O 3 /FeOOH interfacial composite with a unique hierarchical structure and strong electronic interactions. This sheet-like nanostructure provides sufficient space for mass transfer, fully exposes the active sites, and accelerates the reaction kinetics. The optimal sample exhibits excellent oxygen evolution reaction (OER) activity with a low overpotential of 270 mV at a current density of 100 mA cm −2 and a Tafel slope of only 54.7 mV dec −1 . It also has excellent durability. This study provides a new perspective for developing efficient electrocatalysts by constructing interfacial composites.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xuefeng Zhang,Yong Liu,Shangli Dong,Zhuyu Ye,Yidan Wei
The FeOOH has been a hotspot in the field of electrochemical research over recent years owing to its typical channel-type nanoporous structure and high theoretical specific capacitance. However, the poor electrical conductivity limits the applications in supercapacitors . In this investigation, the nanocomposites with amorphous FeOOH on Ti 3 C 2 T x nanosheets were one-step chemically synthesized by using FeCl 3 ·6H 2 O, NH 4 HCO 3 , and Ti 3 C 2 T x (MXene) at room temperature. The nanocomposite samples have been characterized by XRD, SEM, TEM , XPS, cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) measurements. The results show that the capacitive performance is remarkably improved by introducing highly conductive Ti 3 C 2 T x and being composited with amorphous FeOOH. The specific capacitance of the as-prepared nanocomposite reaches 217 F g −1 at current density of 1 A g −1 which is much higher than that of amorphous FeOOH. It also exhibits good rate performance and high charge-discharge cycling stability. The enhancement in electrochemical performance is mainly attributed to the open layered structure with amorphous FeOOH nanoparticles uniformly distributed on Ti 3 C 2 T x nanosheets, which has the enlarged electrode-electrolyte interface area, the shortened diffusion path of ions, and the improved electrical conductivity provided by the conductive Ti 3 C 2 T x frame.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Juan Liu,Yanyi Liu,Yuxiang Shen,Xudong Wei,Wenhuan Yuan,Jianying Qi,Jielong Cao,Pengyuan Deng,Haiyao Hu,Liang Wang,Jin Wang
Thallium (Tl) is an untraditional toxic metal. Emerging Tl pollution has received increasing concerns. Despite its extreme biotoxicity, Tl is an irreplaceable element for specific high-tech fields (e.g., superconductors, semiconductors, and optical fibers) due to its peculiar physio-chemical properties. Besides, Tl has been also regarded as critical strategic metal owing to its low abundance and scarcity in the earth’s crust. Herein, a novel composite of α-FeOOH@BC was facilely synthesized via biochar modification with environmentally abundant iron oxides (α-FeOOH) to separate Tl(I) from wastewater. The results showed that overall large distribution coefficient values ( K d > 5000 mL/g) of Tl separation by α-FeOOH@BC in a wide pH range (5.0–11.0) were achieved, suggesting a generally promising Tl separation capacity. Multiple characterizations with Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) indicate that the dominant Tl separation mechanisms included electrostatic attraction, ion exchange and complexation. These findings indicate that the α-FeOOH@BC material may have important application in Tl separation from industrial wastewaters, which are usually moderately acidic with pH values ranging from 5.0 to 7.0. This study offers novel perspectives on using environmental abundant iron oxides modified biochar for easy and fast separation of Tl from industrial wastewater. All these findings can facilitate to develop waste-to-resources strategy for recycling Tl in the loop of circular economy and industrial symbiosis.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 6
·2162-2171
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IF 3.343
Wei Li,Shu-ao He,Xiao Wang,Qiong Ma,Chen-hui Zhao
Summary β-iron oxide hydroxide (β-FeOOH) had been proven to be an effective co-catalyst during H 2 evolution reaction (HER) process. In this research, a BiOCl/β-FeOOH heterojunction was successfully synthesized by a solid-state doping method. Then, the structure, composition, and photo-electrochemical properties of the prepared photocatalysts were studied. For the superior HER photocatalytic activity of ultrasmall β-FeOOH nanoparticles (NPs) and the formation of the BiOCl/β-FeOOH heterojunction, this heterojunction photocatalyst exhibited very superior photocatalytic performance in the HER process. Especially, when the amount of incorporated β-FeOOH NPs was appropriate, the BFOH-2 possessed the highest photocatalytic activity in HER process, and the HER rate was about 16.64 mmol·g −1 ·h −1 during illuminated time of 6 hours under visible light. When appropriate, ultrasmall β-FeOOH NPs were implanted into the structure of BiOCl, the BiOCl/β-FeOOH heterojunction interfaces would form for the existence of interfacial interactions. Therefore, this BiOCl/β-FeOOH heterojunction exhibited superior visible-light response, fast photo-carrier migration, and high-efficient separation of photo-carriers, so that the BFOH-2 heterojunction possessed high-efficient hydrogen evolution reaction (HER) photocatalytic activity.
研究领域:
材料科学
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光催化
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Zhufeng Hu,Yinxiang Xu,Wenchao Xiang,Xiaodong Guo,Yuchen Tong,Junbo Xu,Chao Yang
The oxygen evolution reaction (OER) is the key to prepare electrocatalysts for water splitting. Heteroatom doping is an effective way to improve the catalytic performance of OER by modulating the local electronic environment and stimulating the synergy. However, the complicated manufacturing methods have hindered their practical application. Herein, we demonstrate a method based on FeOOH/CC precursor to realize the preparation of Ni-P-S@FeOOH/CC catalyst through fast electrodeposition method. The overpotential of Ni-P-S@FeOOH/CC catalyst is 210 mV (10 mA cm −2 ), and still has an initial voltage of 97.35 % for 48 h. The surface area analysis shows a higher electrochemically active surface area for the amorphous structure prepared by electrodeposition method. XPS and DFT results show that the co-doping of P and S can stimulate the synergistic effect and the minimum energy of adsorption/desorption in OER process is only 0.83 eV. The strategy shows good prospects for preparing efficient OER pre-catalysts.
研究领域:
材料科学
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电化学
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催化
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能源材料
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xicheng Wang,Shucheng Yuan,Caobin Wu,Xiao Sun,Shougang Chen,Qingguo Wang
The removal of tetracycline (TC) from wastewater was a necessity due to the overuse of antibiotics and its deleterious effects on the environment. In this study, an adsorbent for the removal of tetracycline was prepared by modifying waste concrete powder using a straightforward iron (iii) chloride (FeCl 3 ) precipitation method. The structure of the prepared material was characterized using a scanning electron microscope(SEM), a specific surface area and pore size analyzer (BET), a Fourier transform infrared spectroscopy(FTIR), an X-ray diffractometer (XRD), and an X-ray photoelectron spectroscopy (XPS). The characterization results demonstrated that amorphous iron (iii) hydroxyl oxides were successfully loaded onto concrete powder. The modified concrete powder exhibited a porous structure, with a notable increase in specific surface area from 12.8 m²/g to 111.5 m²/g and a substantial rise in pore volume from 0.052 cm³ /g to 0.107 cm³ /g. The results of the batch adsorption experiments demonstrated that the adsorbent exhibited a high removal rate of tetracycline, reaching 83.3 % at pH of 4, a dosage of 2 g/L, a temperature of 25°C, and a TC concentration of 10 mg /L. Furthermore, the effects of the initial pH of the solution, the dosage of the adsorbent, and the presence of co-existing ions on the adsorption of tetracycline from modified concrete powder were investigated. The adsorption kinetics revealed that the pseudo-second-order model was more consistent with the adsorption behavior, while the adsorption isotherms indicated that the Freundlich model was more suitable than the Langmuir model. Moreover, an examination of the thermodynamic outcomes substantiated that the adsorption was spontaneous, and endothermic. The primary mechanisms of TC removal by modified concrete powder are electrostatic attraction, hydrogen bonding interactions, pore-filling effects, and surface complexation. This study presented a convenient, effective, and potentially profitable method for the construction of adsorbents with low-cost to remove TC from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Ziqi Zhao,Fuxi Bao,Jiawen Wang,Zongli Gu,Yanbing Huang,Chaocao Cao,Yidan Yuan,Changhong Sun,Wen Guo
Alkaline water electrolysis driven by sustainable energy is a viable approach for large-scale green hydrogen production. The development of non-precious metal-based electrocatalysts that combine high activity and stability for the alkaline oxygen evolution reaction (OER) is of great importance. In this work, we design and construct a δ-FeOOH/NiMn 2 S 4 /NF heterointerface using a solvothermal/calcination process followed by a facile successive ionic layer adsorption reaction (SILAR) treatment. Experimental tests indicate that the formation of the heterogeneous interface between the δ-FeOOH and the NiMn 2 S 4 creates a good electron transport channel for an efficient electrocatalytic process and improves the charge transfer kinetics. As a result, the prepared δ-FeOOH/NiMn 2 S 4 /NF exhibits a low overpotential of 210 mV at 10 mA cm −2 and a low Tafel slope value of 46.6 mV dec −1 , and satisfactory stability with a 92.9 % retention after 72 h of OER operation at around 100 mA cm −2 . In situ Raman and in-situ attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) tests show that the introduction of δ-FeOOH inhibits the oxidation of Ni 2+ to Ni 3+ and stabilizes the Ni-S bond to prevent its auto-oxidation, leads to an increase in the electrocatalytic OER activity.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 37
·19404-19412
·
IF 6.895
Xi Cao,Yan Sang,Lvxuan Wang,Gaofei Ding,Runhan Yu,Baoyou Geng
Electrocatalytic water decomposition is the key to sustainable energy, and the design and synthesis of cost-effective electrocatalysts is the main objective of electrocatalytic water splitting. In this paper, multi-interfacial FeOOH@NiCo2O4 hybrid nanoflowers are prepared through a two-step hydrothermal reaction. In such heterostructures, NiCo2O4 nanoflowers are coated with a layer of FeOOH nanoparticles. In addition, the obtained electrocatalyst could provide abundant electroactive sites and the formation of FeOOH@NiCo2O4 nanointerfaces can also improve the charge transfer rate. As a result, under the HER and OER conditions, the prepared catalysts show an outstanding electrocatalytic performance. Moreover, in a two-electrode water splitting system, the FeOOH@NiCo2O4 heterostructure, as a dual-function electrocatalyst, needs a cell voltage of only 1.58 V at a current density of 10 mA cm−2. This study provides a facile and feasible method to construct different kinds of heterostructures as bifunctional electrocatalysts with multiple interfaces by a simple hydrothermal method.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
EES Catalysis
·
2023
·Vol. 2
·期 1
·324-334
·
IF 0
Haifan Wang,Menglei Yuan,Jingxian Zhang,Yiling Bai,Ke Zhang,Bin Li,Guangjin Zhang
Electrocatalysis has been intensively studied in nitrogen (N2) reduction for its sustainable power and stable catalytic performance, but it is still limited by weak activation of N2 at the catalytic sites, and the competition from the hydrogen evolution reaction (HER). The special d-orbital electron arrangement of transition metals and the tuning of the microenvironment provide possible strategies to enhance the activation of N2, while improving the selectivity of the eNRR. Herein, FeO(OH, S) with high spin state and Mo–FeOOH with low spin state were designed around the FeOOH-based catalysts through elemental doping, which could achieve excellent ammonia yield performance of 80.1 ± 4.0 μg h−1 mgcat−1 (FE 36.9 ± 0.5%) and 86.8 ± 4.1 μg h−1 mgcat−1 (FE 29.1 ± 0.8%) in 0.1 M LiClO4 at −0.6 V vs. RHE, respectively, coupled with polyethylene glycol (PEG) to inhibit the HER. Based on theoretical calculations to investigate the adsorption of N2 on Fe sites, the FeO(OH, S) catalyst has stronger adsorption ability, which may originate from the high spin effect, which means that the more isolated and highly active eg orbital electrons are more beneficial to realize the electronic feedback mechanism, promoting the d–π* orbital interaction with N2.
研究领域:
电化学
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催化化学
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材料科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）