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
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 12
·2913
·
IF 4.2
Jingren Yang
Developing a low-cost and highly efficient semiconductor photocatalyst for the decomposition of organic pollutants and antibiotics is highly desirable. Herein, FeOOH nanosheets were prepared using a liquid-phase stirring technique and combined with ZnCdS (ZCS) nanoparticles to construct FeOOH/ZCS nanocomposite photocatalysts. The photocatalytic efficiency of the FeOOH/ZCS nanocomposite was evaluated for the decomposition of various pollutants, including rhodamine B, methylene Blue, and tetracycline. The FeOOH/ZCS nanocomposite exhibited significantly higher photocatalytic performance for the decomposition of various organics. Moreover, the optimized FeOOH/ZCS retained more than 90% of its initial photocatalytic activity even after five successful runs. Radical quenching test and electron spin resonance (ESR) analysis revealed that hydroxyl radicals (•OH) play a dominant role for the decomposition of organics. The FeOOH/ZCS Z-scheme heterojunction significantly facilitates higher charge transfer efficiency and the generation of reactive radicals, resulting in excellent photocatalytic degradation performance. This work offers a new approach to synthesis FeOOH-based photocatalyst for the elimination of organics and antibiotics in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2025
·
IF 3
Na Guanqiong,Chen Ping,Qian Yanya,Meng Danqun,Liu Zhipeng,Shan Yujuan
Traditional fluorescent immunosensors usually suffer from high background signals in food samples, which significantly reduces their detection sensitivity. In this study, δ-iron oxyhydroxide (δ-FeOOH) nanosheets with anti-bacitracin zinc (BAC) monoclonal antibodies (mAb) were conjugated as fluorescence receptors, while amino-functionalized carbon quantum dots (CQDs) as fluorescence donors for BAC. A novel fluorescence immunoassay was developed that eliminated background noise based on the “turn on” principle. Upon introduction of BAC into the sample, the nano-assembled probe showed an increase in fluorescence recovery, leading to higher fluorescence intensity at elevated BAC concentrations. This strategy exhibited a linear response for BAC concentrations ranging from 5 to 40 ng/mL, with a limit of detection (LOD) of 2.04 ng/mL. Our findings present a promising immunological approach for the sensitive and selective detection of BAC residues in food.
研究领域:
分析化学
·
食品科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 8
·期 19
·3643-3650
·
IF 4.59
Yadong Li,Baojin Chen,Huaming Zhang,Jing Gao,Huachuan Sun,Aziz Habibi-Yangjeh,Chundong Wang
Graphical Dual purpose : A FeOOH@NiTe hybrid nanorod arrays on Ni foam was synthesized as electrocatalyst for the oxygen evolution reaction, exhibiting excellent OER activity and long-term stability. The synthesized NiTe@FeOOH/NF also shows enhanced catalytic performance for the urea oxidation reaction. Hydrogen is the most promising alternative energy source in the face of energy crisis, and water splitting is a green strategy for hydrogen generation. The oxygen evolution reaction (OER) is the essential half-reaction in electrochemical water splitting, and thus development and exploration of electrocatalysts with excellent performance are vital to prompt the application of OER. Due to the unique electronic properties of NiTe and strong synergistic interaction between NiTe and FeOOH, NiTe@FeOOH hybrid nanorods were successfully fabricated on Ni foams (NF) by a hydrothermal reaction step and another in-situ growth step for the first time without consuming any extra energy. The 3D structure of the NiTe@FeOOH/NF was confirmed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometry (EDS) mapping technologies. Electrochemical measurements showed that the as-prepared NiTe@FeOOH/NF needs only an overpotential of 241 mV to achieve a current density of 10 mA cm −2 in 1.0 M KOH and requires 1.341 V to drive 10 mA cm −2 in 1 M KOH with a 0.33 M urea, showing excellent long-term stability. The NiTe@FeOOH/NF as the bifunctional electrocatalyst in an electrolyzer shows high efficiency with a cell voltage of 1.50 V at 10 mA cm −2 . This work can provide a new efficient method to construct highly active and cost-effective OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 11
·2005587
·
IF 30.849
Ke Wang,Hongfang Du,Song He,Lei Liu,Kai Yang,Jinmeng Sun,Yuhang Liu,Zhuzhu Du,Linghai Xie,Wei Ai,Wei Huang
Layered γ-type iron oxyhydroxide (γ-FeOOH) is a promising material for various applications; however, its sheet-shaped structure often suffers from instability that results in aggregation and leads to inferior performance. Herein, a kinetically controlled hydrolysis strategy is proposed for the scalable synthesis of γ-FeOOH nanosheets arrays (NAs) with enhanced structural stability on diverse substrates at ambient conditions. The underlying mechanisms for the growth of γ-FeOOH NAs associated with their structural evolution are systematically elucidated by alkalinity-controlled synthesis and time-dependent experiments. As a proof-of-concept application, γ-FeOOH NAs are developed as electrocatalysts for the oxygen evolution reaction (OER), where the sample grown on nickel foam (NF) exhibits superior performance of high catalytic current density, small Tafel slope, and exceptional durability, which is among the top level of FeOOH-based electrocatalysts. Density functional theory calculations suggest that γ-NiOOH in situ generated from the electrooxidation of NF would induce charge accumulation on the Fe sites of γ-FeOOH NAs, leading to enhanced OER intermediates adsorption for water splitting. This work affords a new technique to rationally design and synthesize γ-FeOOH NAs for various applications.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 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）