ACS Applied Energy Materials
·
2022
·
IF 6.959
Rongcheng Peng,Yang Gao,Hussein A. Younus,Yan Zhang,Wenpeng Ni,Shiguo Zhang
Upgrading CO2 to formate systems is a promising avenue for fuel production, and SnOx is a unique low-cost candidate for this conversion. However, the high oxygen affinity of Sn sites leads to a strong adsorption of O-bound intermediates, resulting in a low efficiency of CO2 reduction. Herein, density functional theory (DFT) calculations confirmed that a H-doping strategy of SnO2 produces partially depleted positive charge Sn sites, weakening the adsorption of HCOO* and boosting the electron transfer kinetics. Experimentally, H-doped commercial SnO2 nanoparticles (H-SnO2) indeed had enhanced intrinsic activity for CO2-to-formate conversion with suppressed hydrogen evolution performance. Remarkably, H-SnO2 achieves over 90.0% formate selectivity within −0.6 to −1.0 V (vs RHE) at the industrial current density of 220 mA cm–2. Electrochemical measurements and in situ Raman spectra analysis together disclosed that H-doping speeds up the kinetic rate for the first electron transfer of CO2 reduction and also promotes formate desorption, resulting in the impressively high current density and selectivity of H-SnO2.
研究领域:
材料科学
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电化学
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能源转换
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
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IF 4
Yong-Xiang Wu,Xun Zhou,Benwang Zhou,Chao Li,Peng Cui,Manhuan Cheng,Yang Wang,Xinsong She
Presently, Cu(OH) 2 nanowire arrays@Cu Foam (Cu(OH) 2 –NWA@Cu Foam) nanostructure has been confirmed to possess an excellent capacity of nonenzymatical electroanalysis of histamine (His). Based on Cu(OH) 2 –NWA@Cu Foam electrode, electrochemical investigations elucidated electron transfer kinetics principles of electrooxidation of His. Substantially, it was realized that a four–electron–transferring dehydrogenation was involved in diffusion–controlled electrooxidation of His, contributing tremendously to establishing as–proposed mechanization of His electrooxidation. At optimal conditions, Cu(OH) 2 –NWA@Cu Foam electrode reflected excellent electrochemical performance such as sensitivity of 3.089 mA mM –1 cm –2 , limit of determination of 94 nM, respond time of 1.6 s and linear respond rang of 0.5–1250 μM. The outperformed electroanalytical performance can be physically explicated by the dedications from larger exposed surface area, bigger interface–hydrophilicity–deduced His diffusion coefficient and less charge transfer resistance. Moreover, the outstanding selectivity, stability and reproducibility of Cu(OH) 2 –NWA@Cu Foam electrode ensured its practical effectiveness in regulating real His levels in fermented mandarin fish. Compared with control group, the mandarin fish by inoculating Lactobacillus sakei subsp . sakei delivered less His contents, deducing that inoculation of Lactobacillus sakei subsp . sakei can effectively depress His generation during fermentation process. Eventually, the one–step as–established Cu(OH) 2 –NWA@Cu Foam nanostructure positioned itself as an upcoming possibility to pursue commercialized utilization.
研究领域:
食品科学
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电化学
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微生物学
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 8
·083508
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IF 3.1
Xuan Dinh Ngo,Ngoc Huyen Nguyen,Thi Lan Huong Phung,Tuan Anh Nguyen,Nguyen Thanh Vinh,Quy Nguyen Van,Vinh Hoang Tran,Nhung Pham Tuyet,Anh-Tuan Le
In this study, we describe experimental efforts to decipher the role of ZnCo2O4 nanoflakes (ZCO-NFs) for selective enhancement of voltammetric responses of screen-printed electrode (SPE) toward redox species system. The ZCO-NFs sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and UV–vis spectroscopy. The electrochemical characterization of bare SPE and modified SPE electrodes was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott−Schottky analysis. A series of redox systems including paracetamol (PA), dopamine (DA), chloramphenicol (CAP), furazolidone (FZD), p-nitrophenol (p-NP), carbaryl (CBR), ofloxacin (OXF), and erythromycin (ERY) were selected to investigate for (i) reversible redox process, (ii) irreversible electrochemical oxidation process, and (iii) irreversible electrochemical reduction process on both bare-SPE and ZCO-NFs/SPE electrodes. The obtained results showed that ZCO-NFs possess the selective enhancement of electrochemical response for redox systems with an increase of 24%–90% for PAR, DA, FZD, CAP, and CBR and a decrease of 13%–49% for p-NP, ERY, and OFX. The different electrochemical response of redox species at nanostructured semiconductor electrodes is attributed to the contribution of both the adsorption capacity of redox species and the interfacial electron transfer process between electrode and redox species. An insight into the interfacial electron transfer kinetics and its contribution to the enhancement of electrochemical response on p-type semiconductor electrode is helpful in designing high-performance sensing platforms based on spinel oxide nanostructures.
研究领域:
材料科学
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分析化学
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电化学
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高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Wang Xue,Zhong Yuan,Li Tingting,Wang Kunyu,Dong Weinan,Lu Min,Zhang Yu,Wu Zhennan,Tang Aiwei,Bai Xue
Photoluminescence is one of the most intriguing properties of metal nanoclusters derived from their molecular-like electronic structure, however, achieving high photoluminescence quantum yield (PLQY) of metal core-dictated fluorescence remains a formidable challenge. Here, we report efficient suppression of the total structural vibrations and rotations, and management of the pathways and rates of the electron transfer dynamics to boost a near-unity absolute PLQY, by decorating progressive addition of cations. Specifically, with the sequential addition of Zn 2+ , Ag + , and Tb 3+ into the 3-mercaptopropionic acids capped Au nanoclusters (NCs), the low-frequency vibration of the metal core progressively decreases from 144.0, 55.2 to 40.0 cm −1 , and the coupling strength of electrons-high-frequency vibration related to surface motifs gradually diminishes from 40.2, 30.5 to 14.4 meV. Moreover, introducing cation additives significantly reduces electron transfer time from 40, 27 to 12 ps in the pathway from staple motifs to the metal core. This benefits from the shrinkage of the total structure that speeds up the shell-core electron transition, and in particular, the Tb 3+ provides a hopping platform for the excited electrons as their intrinsic ladder-like energy level structure. As a result, it allows a remarkable enhancement in PLQY, from 51.2%, 83.4%, up to 99.5%.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Zhenfei Chen,Yan Zhang,Yongqiang Yang,Xuerong Shi,Lu Zhang,Guangwen Jia
The determination of organophosphorus pesticide (OPS) residues is of great importance in reducing environmental pollution and ensuring food safety. A high-performance nitrogen-doped holey graphene (N-HG) electrochemical sensor for determination of methyl parathion (MP; one of the most commonly used OPS) based on a hierarchical macro- and nanoporous 3-D architecture has been successfully developed. The influence of various N-configurations on electron transfer kinetics and the sensing performance of the N-HG modified electrode was investigated systematically through combined practical and theoretical studies. Three N-bonding configurations were investigated in N-HG, namely, pyridinic N, pyrrolic N, and graphitic N. It was found that N-HG with a high pyrrolic-N content exhibited the largest electron transfer rate and the best sensing performance (ultralow detection limits: 3.5 pg·ml −1 ; wide linear range: 1 ng ml −1 –150 μg·ml −1 ), indicating that pyrrolic-N in the N-HG played a critical role in the electrochemical process and in enhanced electrocatalysis, as confirmed by first-principle calculations. Furthermore, the N-HG based sensor exhibited excellent selectivity and freedom from interference, good accuracy and satisfactory recoveries for real samples, confirming N-HG based electrochemical sensors have great scope for applications in environmental analysis and bio-sensing.
研究领域:
环境科学
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分析化学
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高影响因子
Nanoscale
·
2025
·
IF 5.1
Runxin Li,Yangyang Dong,Heng Xu,Yifei Yuan,Jie Xu
High-valent metal single atoms generally exhibit exceptional electrocatalytic activity because of their rapid electron-transfer kinetics. However, their synthesis remains a formidable challenge owing to intrinsic instability under typical preparation conditions. Herein, atomically dispersed Ir3+ single atoms were successfully stabilized on a NiS2 matrix via a substitutional replacement of Ni lattice sites by Ir, followed by coordination with adjacent S atoms. The resulting catalyst delivers outstanding oxygen evolution reaction (OER) performance, achieving a current density of 10 mA cm−2 at an overpotential of only 190 mV. Density-functional theory calculations reveal that the high oxidation state of Ir upshifts the Ni d-band center toward the Fermi level, thereby strengthening OOH* adsorption and accelerating the OER kinetics. This work not only provides a robust strategy for constructing high-valent single-atom catalysts but also highlights the pivotal role of sulfide supports in stabilizing high oxidation states for advanced electrocatalysis.
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高影响因子
INORGANIC CHEMISTRY
·
2025
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IF 4.7
Ao Li,Jiran Li,Mengcheng Yin,Qizhen Zhang,Junhong Chen,Bozhong Pi,Minghao Bao,Changkun Song,Wei Shi,Chunpei Yu,Wenchao Zhang
The electrochemical synthesis of azo-bridged nitrogen-rich heterocyclic compounds has emerged as a promising strategy in the field of energetic materials due to its efficiency and controllability. Here, we present an innovative and environmentally benign electrocatalytic strategy employing cobalt phosphide (Co2P) nanowire arrays as cathodic catalysts for the safe and efficient synthesis of sodium 5,5′-azo-tetrazole under mild electrochemical conditions. Notably, the Co2P catalyst drives the reaction at a low potential of −0.4 V (vs Hg/HgO), which benefits from its unique needle-like morphology that optimizes electron transport pathways and active site distribution. By adjustment of the applied potential and reaction time, the yield of the reductive coupling can be effectively controlled. A detailed mechanistic pathway has been elucidated for the cathodic reductive coupling of sodium 5-nitrotetrazole mediated by Co2P electrodes. Electrochemical reduction at −0.6 V (vs Hg/HgO) and −0.8 V (vs Hg/HgO) yields a tunable mixture of sodium 5,5′-azo-tetrazole and its azoxy derivative, whereas exclusive generation of sodium 5,5′-azo-tetrazole is achieved at −1 V (vs Hg/HgO) through precise modulation of electron transfer kinetics. This voltage-gated synthesis paradigm establishes a novel electrochemical methodology for the programmable assembly of nitrogen-rich heterocyclic frameworks, offering unprecedented control over azo-linkage formation in energetic material design.
研究领域:
电化学
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材料科学
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纳米技术
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有机合成
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能源材料
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DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Lina Dai,Qiang Li,Xianglan Dong,Enqi Zhang,Yufeng Hu,Xin Guo,Yanduo Liu
Photocatalysis exhibits great potential for applications in solving energy and environmental problems, and has received widespread attention. This article constructs a new type of Mn-Fe Prussian blue analogues S-scheme mechanism photocatalytic material. The material is composed of oxidized photocatalysts (Ag 2 MoO 4 ) and reduced photocatalysts (Mn-Fe PBAs). The composite photocatalyst constructed in this way shows advantages such as a wide spectral response range, high charge carrier separation efficiency, and strong oxidation–reduction ability, which can significantly enhance photocatalytic efficiency. By studying the construction method and CO 2 reduction performance of the photocatalyst, the structure-performance relationship can be clarified. The CO production rate is 43.3 μmol/g/h, and the selectivity can reach 94.9 %, which is far superior to the current mainstream photocatalytic system. The electron transfer kinetics and S-scheme charge separation mechanism between the Mn-Fe PBAs and Ag 2 MoO 4 interfaces are explained by steady-state surface photovoltage spectroscopy (SS-SPS) and near ambient pressure XPS (NAP-XPS). In-situ DRIFTS techniques are used to monitor the changes of transition intermediates, and combined with theoretical calculations, the activation mechanism of CO 2 by the Mn-Fe catalytic site is deeply revealed at the atomic level. This study provides new theoretical guidance and profound insights for the construction of Prussian blue analogues photocatalysts.
研究领域:
材料科学
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环境科学
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物理化学
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纳米技术
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催化
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能量转换
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Xinxin Jiang,Ye Song,Meiling Dou,Jing Ji,Feng Wang
In this work, we fabricated MoS 2 /WS 2 heterostrucutures with decoration of Bi 2 S 3 nanorods through different stacking sequences (MoS 2 /WS 2 (bottom layer) +Bi 2 S 3 (top layer) and Bi 2 S 3 (bottom layer) + MoS 2 /WS 2 (top layer), respectively). The morphology and structure were studied by scanning electron microscope (SEM), transmission electron microscope (TEM) and the X-ray powder diffraction (XRD). It was found that the hybrid structure with different stacking sequences was composed of Bi 2 S 3 nanorods and MoS 2 /WS 2 nanosheets. By UV–visible absorption spectra (UV–vis) and photoluminescence (PL) experiments, we found that the composite catalysts of both stacking sequences can promote visible-light utilization and accelerate the electron transportation. Electrochemical measurements (such as cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscope (EIS) under light illumination or in dark) indicated that the MoS 2 /WS 2 +Bi 2 S 3 possessed higher photoelectrocatalytic activity towards hydrogen evolution reaction (HER) than that of Bi 2 S 3 +MoS 2 /WS 2 due to its proper energy band alignment that facilitates the effective carrier separation, the lower charge transfer resistance , higher electrochemically active surface area as well as the fast electron transfer kinetics. Inspired by these observations, we believe that MoS 2 /WS 2 +Bi 2 S 3 catalyst is a potential candidate for photoelectrocatalytic production of H 2 .
研究领域:
材料科学
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纳米技术
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电化学
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光化学
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产品关联
DOI
高影响因子
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