Carbon Energy
·
2026
·
IF 24.2
Kaiming Li,Ben Huang,Aihao Xu,Kai Nie,Xianhai Bai,Qian Ning,Guodong Wang,Shiming Qiu,Huibing He,Yang Ren,Jing Xu,Xucai Yin
The inherent hydroxide-rich (OH⁻) environment in alkaline media facilitates the two-electron oxygen reduction reaction (2e − ORR). However, the strong interaction between alkali metal cations and solvated water molecules significantly reduces the connectivity of the hydrogen bond network within the alkaline electric double layer, thereby severely impeding rapid proton transport at the electrode surface. Herein, we rationally designed ZnO with oxygen vacancies-driven [Fe(CN) 6 ] 3− coordination (denoted as Fe(CN) 6 -ZnO-V O ) as an efficient 2e − ORR catalyst for H 2 O 2 electrosynthesis. We demonstrate that the locally coordinated [Fe(CN) 6 ] 3− establishes pathways for rapid proton transfer at the electrode surface by forming a hydrogen bond network with interfacial water molecules. Concurrently, this configuration significantly reduces the energy barrier of the *OOH intermediate. These synergistic effects collectively optimize the electrocatalytic performance for H 2 O 2 production under alkaline conditions. As expected, the Fe(CN) 6 -ZnO-V O delivers a significantly increased current density of 130 mA cm −2 that is much higher than ZnO (32 mA cm −2 ), as well as a superior H 2 O 2 production rate of 9.41 mol g cat −1 h −1 and a high faradaic efficiency of exceeds 90%. Our study highlights the crucial role of interfacial hydrogen-bonding connectivity and provides theoretical and technical guidance for developing reliable strategies to enhance the electrocatalytic properties of 2e − ORR.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Gang Li,Ruiyang Tan,Xiangcheng Lu,Xinyu Zhang,Chengcheng Zhang,Bohong Gao,Yuting Zhou,Ke Chen,Ping Chen,Xinyi Wang
Chemical composition and morphological optimization are both effective strategies for constructing excellent electromagnetic wave absorption (EMWA) materials. While efficient EMWA materials derived from both metal-organic frameworks (MOFs) and MXenes have been extensively studied, composites derived from the Hofmann framework with MXene have not been reported. In this study, we employed a Hofmann framework ([Fe(pz)Ni(CN) 4 ], pz = pyrazine) and MXene (Ti 3 C 2 T x ) to create new MXene@Hofmann (MH1 and MH2) composites, using a simple co-precipitation method with two different contents of [Fe(pz)Ni(CN) 4 ]. The FeNi/C/TiO 2 composites with a multi-layered structure inherited from MXene were prepared by annealing the MXene@Hofmann composites at 500, 600, and 700 °C, resulting in the formation of MH1-500/600/700 and MH2-500/600/700 composites. Their compositions, morphologies, electromagnetic parameters, and EMWA performances were characterized. For the composites with a high [Fe(pz)Ni(CN) 4 ] content, MH2-600 has a minimum reflection loss ( RL min ) value of −30.63 dB at a thickness of only 1.8 mm and the broadest effective absorption bandwidth (EAB) of 3.90 GHz at 2.0 mm, while MH2-700 exhibits superior EMWA performance with an RL min value of −34.34 dB at 1.9 mm and an EAB value of 4.96 GHz at 2.1 mm. Their impressive EMWA performance might be attributed to the synergistic dielectric loss and magnetic loss and also the impedance matching from the reasonable ratio of the magnetic and dielectric components. This work demonstrates an effective strategy for constructing EMWA materials from the Hofmann framework and MXene.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Xiaoyue Liu,Hongtao Xie,Jian Mao
The porous electrodes derived from Prussian blue analogs (PBAs) show high specific capacity and superior energy densities in supercapacitors due to their tunable chemical compositions, open three-dimensional network framework and large surface area. In this work, La-Fe PBA with different morphologies is prepared at mild conditions via controlling the composition of mixed solvent and the structural evolution of the La-Fe PBA is further explored. The solubility of K 3 [Fe(CN) 6 ] and the influence of ethanol on the crystal growth is used to control the synthesis of La-Fe PBA. Four different morphologies of La-Fe PBA, such as chamfered hexagonal bipyramid microcrystals, hexagonal flakes, erythrocyte-like microstructure and small flakes, are successfully synthesized by changing the ethanol/water ratio of mixed solvent. The porous LaFeO 3 with the same shape is obtained by calcining the La-Fe PBA at 500 °C, which is subsequently employed as electrodes for battery-type supercapacitor. The erythrocyte-like LaFeO 3 shows remarkable specific capacity (330 C g −1 ) at 1 A g −1 , energy density (23.8 Wh kg −1 ) and power density (400 W kg −1 ) at 1 A g −1 . This work could provide a porous material for high-performance supercapacitors as well as an exciting strategy to develop and design materials with specific morphology.
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高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Shiyong Xu,Mei Li,Yijun Wang,Caiyun Gao,Rongsheng Xu,Zhiliang Jin
A novel composite photocatalyst for photocatalytic decomposition of water for hydrogen evolution was successfully synthesized by in-situ growth of nitrogen and sulfur co-doped coal-based carbon quantum dots (NSCQDs) nanoparticles on the surface of sheet cobalt-based metal-organic framework (Co-MOF) and graphitic carbon nitride (g-C 3 N 4 , CN). The structure and properties of the obtained catalysts were systematically analyzed. NSCQDs effectively broaden the absorption of Co-MOF and CN in the visible region. The new composite photocatalyst has high hydrogen production activity and the hydrogen production rate reaches 6254 μmol/(g·h) at pH = 9. At the same time, NSCQDs synergy Co-MOF/CN composites have good stability. After four cycles of hydrogen production, the performance remains relatively stable. The transient photocurrent response and Nyquist plot experimental results further demonstrate the improvement of carrier separation efficiency in composite catalysts. The semiconductor type (n-type semiconductor) of the single-phase catalyst was determined by the Mott-Schottky test, and the band structure was analyzed. The conductive and valence bands of CN are −0.99 and 1.72 eV, respectively, and the conduction and valence bands of Co-MOF are −1.85 and 1.33 eV, respectively. The mechanism of the photocatalytic reaction can be inferred, that is, Z-type heterojunction is formed between CN and Co-MOF, and NSCQDs was used as cocatalyst.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
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IF 4.006
Hujun Xie,Yutong Zhang,Mengna Cao,Chengzhi Liu,Yuezhong Mao,Gerui Ren,Zunyi Wu,Sheng Fang,Shiyi Tian,Di Wu
High stability nanoemulsions emulsified by combination of tripolyglycerol monostearate (PGFE) and casein (CN) were fabricated for loading functional components of peppermint oil and β-carotene, and the physicochemical properties, storage stability and sensory characteristics were explored. The β-carotene-loaded peppermint oil nanoemulsions exhibited fine physical stability when the mass ratio of PGFE/CN was less than 0.5. The β-carotene nanoemulsions were pseudoplastic fluid since the flow behavior index was lower than 1, based on the Herschel-Bulkley model. Intelligent sensory analyses clarified that electronic sensory evaluation methods, including colorimeter, electronic nose and electronic tongue, are convenient and effective to distinguish various nanoemulsions with different ratios of mixing emulsifiers. The formation mechanism of nanoemulsions was further explored to reveal the important role of hydrogen bonding and electrostatic interactions to yield nanoemulsions.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Peijie Ma,Xu Zhang,Cong Wang,Zhiwei Wang,Kaiwen Wang,Yibo Feng,Jiaxing Wang,Yadi Zhai,Jiguang Deng,Lihua Wang,Kun Zheng
Polymeric carbon nitride (C 3 N 4 ) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H 2 O 2 ) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C 3 N 4 nanosheets to form a homojunction structure (HJ-C 3 N 4 ), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H 2 O 2 yield of the HJ-C 3 N 4 reached 115 μmol L −1 h −1 in pure water by visible light, which has an 8.6x higher production than g-C 3 N 4 nanosheets . The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
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IF 4.084
Xiaorong Zhang,Muhammad Shakeel,Baoshan Li,Muhammad Arif,Xianglong Kong,Jianjun Liu,Shengli Zuo
The present study is about the fabrication of an efficient photo-/electrocatalyst, prepared via in-situ hydrothermal coupling of ZnO with g-C 3 N 4 . The results prove this electrocatalyst as suitable band structure semiconductor. The crystalline nature and related morphological parameters are controlled by optimized hydrothermal and calcination temperatures conditions. A series of physicochemical characterization are applied to inquire the crystalline structure, surface morphology , optical capabilities and charge transportation properties. Results revealed that the sample acts as excellent electrocatalyst with OER current density at 10 mAcm −2 @ 335 mV and the HER at 100 mAcm −2 @ −225 mV. While upon illuminations its catalytic properties further enhance at OER 10 mAcm −2 @ 326 mV and for HER current density of 100 mAcm −2 @ −167 mV. It can be seen from the present study that g-C 3 N 4 play gigantic role in enhancing the catalytic property of ZnO and hence it leads to a relationship between hierarchical features and photo-/electrochemical activity for water splitting.
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Journal of Materials Chemistry C
·
2015
·Vol. 4
·期 2
·383-390
·
IF 4.696
Xiaodong Yang,Xiuli Chen,Xiaodan Lu,Chenggong Yan,Yikai Xu,Xiaodong Hang,Jinqing Qu,Ruiyuan Liu
A novel fluorescence chemosensor 1 with aggregation-induced emission was designed and synthesized through a nucleophilic addition reaction between cyanide and triphenylamine. It exhibited remarkable selectivity and high sensitivity and was able to detect Fe3+, CN− and SO32− in almost pure aqueous solution with low detection limits of 1.44 μM, 9.88 nM and 0.107 μM, respectively. Job's plot and 1H NMR data showed that the binding stoichiometry of 1 with Fe3+, CN− or SO32− was 1 : 1. Further observations of 1H NMR titration suggested that a coordination bond was formed between two cyano of 1 and Fe3+ which resulted in fluorescence quenching of 1 after detection of Fe3+, whereas the nucleophilic addition of cyanide or sulfite to the vinyl group was responsible for the fluorescent quenching of CN− or SO32− toward 1. The biological applications of 1 were also evaluated and it was found to exhibit low cytotoxicity and membrane permeability. In addition, 1 could also be made into test strips to detect Fe3+ and CN− and was employed as a sensor for detection Fe3+ in living cells.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yu Huang,Xinyang Xu,Fengkun Han,Xi Chen,Guangjian Fan
Photocatalytic technology holds promising prospects for remediating naphthalene pollution in water bodies. In this work, the CN/Pt-P25 photocatalyst was successfully prepared via photodeposition combined with co-pyrolysis methods, and employed for naphthalene photodegradation under simulated sunlight. The chemical state of Pt was found to have a significant impact on the photocatalytic activity. H 2 secondary annealing effectively tuned Pt chemical states, increasing the proportion of Pt 0 species on the CN/Pt-P25 photocatalyst from 41.91 % to 62.24 %. The improved proportion of Pt 0 species proportion led to a reduction in the bandgap, which induced changes in the band positions and notably enhancing the separation efficiency of photogenerated electron-hole pairs. Under simulated sunlight irradiation, (H 2 ) CN/Pt-P25 photocatalyst achieved complete naphthalene photodegradation within 100 min. Thus, photocatalysts containing a high proportion of Pt 0 species exhibited an improved performance in naphthalene photodegradation. These findings provide new insights into the application of photocatalytic technology for the remediation of PAHs.
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Chemosensors
·
2024
·Vol. 12
·期 6
·104
·
IF 3.7
Yanyan Xing,Pingping He,Deyong Wang,Yuan Liang,Xing Gao,Xiaohong Hou
Colorimetric biosensor-based nanozymes have received considerable attention in various fields thanks to the advantages of the simple preparation, good stability, and regulable catalytic activity of nanozymes. In this study, a bimetallic nanozyme Fe3O4@Co3O4/CN was prepared via the high-temperature calcination of Fe3O4-PVP@ZIF-67. The material retained its skeletal structure before calcination, which prevented the aggregation of nanoparticles and exposed more active sites of the nanozyme, substantially enhancing the intrinsic dual enzyme-mimetic activities, including peroxidase- and oxidase-like activities. In particular, Fe3O4@Co3O4/CN with oxidase-like activity catalyzed the colorless tetramethylbenzidine (TMB) to become blue oxTMB with oxygen. Reducing glutathione (GSH) could inhibit the above oxidation reaction. In contrast, with respect to the existence of mercury(II), GSH bound to mercury(II) due to the strong affinity between mercury(II) and -SH, thus eliminating the inhibition and restoring the oxTMB signal. A simple and effective colorimetric sensor was fabricated to detect mercury(II) based on the above principles. The proposed measurement had a linear range of 0.1–15 μM and a limit of detection (LOD) of 0.017 μM. It was shown that the established colorimetric sensing system could be successfully applied to detect mercury(II) in water samples, and the Fe3O4@Co3O4/CN nanozyme proved to be a promising candidate for biosensing application.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ming-Xuan Liu,Yu-Ting Cai,Ruo-Jia Wang,Peng-Fei Zhu,Yan-Chao Liu,Hao Sun,Yong Ling,Wei-Zhong Zhu,Jing Chen,Xiao-Ling Zhang
Hypoxia can lead to liver fibrosis and severely limits the efficacy of photodynamic therapy (PDT). Herein, carbon nitride (CN)-based hybrid nanoparticles (NPs) VPSGCNs@TSI for light-driven water splitting were utilized to solve this problem. CNs were doped with selenide glucose (Se-glu) to enhance their red/NIR region absorption. Then, vitamin A-poly(ethylene glycol) (VA-PEG) fragments and aggregation-induced emission (AIE) photosensitizers TSI were introduced into Se-glu-doped CN NPs (VPSGCNs) to construct VPSGCNs@TSI NPs. The introduction of VA-PEG fragments enhanced the targeting of the NPs to activated hepatic stellate cells (HSCs) and reduced their toxicity to ordinary liver cells. VPSGCN units could trigger water splitting to generate O2 under 660 nm laser irradiation, improve the hypoxic environment of the fibrosis site, downregulate HIF-1α expression, and activate HSC ferroptosis via the HIF-1α/SLC7A11 pathway. In addition, generated O2 could also increase the reactive oxygen species (ROS) production of TSI units in a hypoxic environment, thereby completely reversing hypoxia-triggered PDT resistance to enhance the PDT effect. The combination of water-splitting materials and photodynamic materials showed a 1 + 1 > 2 effect in increasing oxygen levels in liver fibrosis, promoting ferroptosis of activated HSCs and reversing PDT resistance caused by hypoxia.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yesheng Fu,Huayu Chen,Zehao Wang,Dandan Yu,Junhui Liang,Yuexiang Huang,Ismaila Taiwo Bello,Gayi Nyongombe Ekambo,Mokhotjwa Simon Dhlamini,Da Chen
The development of efficient and stable electrocatalysts for the oxygen evolution reaction (OER) in acidic media remains a critical challenge. Here, we designed a hierarchical structure catalyst comprises of MnO 2 and carbon‑nitrogen compound (CN) coated MoO 2 (denoted as MoO 2 @CN/MnO 2 ), in which the Mn species is identified as the real active site for OER and the Mo-containing species (MoO 2 @CN) serves as the promoter. The incorporation of CN into the interface between the MoO 2 and MoO 2 facilitates the inner electron transfer from Mo to Mn, thereby increasing the quantity of Mn 3+ active sites for more efficient OER process, and at the meantime, the presence of CN effectively suppresses Mn dissolution during OER, stabilizing these active sites and improving the overall catalytic stability. The MoO 2 @CN/MnO 2 heterostructure exhibits decreases of 29 mV and 74 mV for the overpotential at 20 mA cm −2 compared with the MoO 2 /MnO 2 and the MnO 2 , and shows enhanced electrocatalytic stability. This work provides a promising and facile strategy for enriching and stabilizing the active species for acidic OER catalysts.
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PubMed
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