APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Zongyun Mu,Ting Guo,Hao Fei,Yaoqing Mao,Zhuangzhi Wu,Dezhi Wang
Rational design of robust and highly efficient electrocatalysts for hydrogen evolution reaction (HER) is crucial for the development of energy conversion technologies. Molybdenum phosphide (MoP) has displayed excellent HER activities and triggered substantial interests as a promising water splitting electrocatalyst. In this work, a Mn doping strategy is proposed to improve the HER performances of MoP for the first time as well as the construction of novel porous interconnected structures. And the effect of doping contents and corresponding improvement mechanism are also discussed. It is found that the obtained 0.05Mn-MoP catalyst with porous interconnected nanosheets (NSs) presents the best HER properties as well as outstanding durability. The porous interconnected structures offer more exposed active sites, and the Mn doping optimizes the electronic configuration of MoP, leading to lower charge transfer resistance and higher intrinsic activity. This work provides a facile method to construct porous structures and demonstrate the effective strategy of Mn doping for the enhancement of MoP for the HER.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 11
·1520
·
IF 4.034
Lei Qiu,Jiaxiong Xu,Xiao Tian
Ag and Mn dopants were incorporated into Cu2ZnSnS4thin film to reduce defects in thin film and improve thin film properties. Sol–gel and spin-coating techniques were employed to deposit Ag and Mn co-doped Cu2ZnSnS4thin films. The structures, compositions, morphologies, and optical properties of the co-doped thin films were characterized. The experimental results indicate the formation of kesterite structure without Ag and Mn secondary phases. The amount of Ag in the thin films is close to that in the sols. The co-doped Cu2ZnSnS4thin films have an absorption coefficient of larger than 1.3 × 104cm−1, a direct optical band gap of 1.54–2.14 eV, and enhanced photoluminescence. The nonradiative recombination in Cu2ZnSnS4thin film is reduced by Ag and Mn co-doping. The experimental results show that Ag and Mn incorporation can improve the properties of Cu2ZnSnS4thin film.Keywords:Cu2ZnSnS4;Ag and Mn co-doping;thin films;sol–gel preparation
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PubMed
高影响因子
OPTICAL MATERIALS
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2019
·
IF 2.687
Mingrui Tan,Ning Sui,Qinghui Liu,Zhihui Kang,Lin Wang,Wenquan Wang,Qiang Zhou,Hanzhuang Zhang,Yinghui Wang
Low-toxicity zinc blende Mn–CuInS (MCIS) thin films and a corresponding optical switch were fabricated and examined using multiple measurements. Transient absorption spectroscopy indicated that multiple carrier processes occurred during carrier relaxation. The optical switch devices showed good responsivity and stability. The kinetics of the photo-generated charge carriers were affected by carrier concentration and showed no electric-field dependence. These prepared devices showed potential for rapid photodetection applications.
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Analytical Methods
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2013
·Vol. 5
·期 21
·6094-6099
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IF 1.855
Jing Ma,Fang Wang,Meng Fan,Tianyi Wang,Wei Bian,Shaomin Shuang
The room temperature phosphorescence (RTP) of quantum dots (QDs) offers many advantages compared with fluorescence, such as a longer emission lifetime, wider gap between excitation and emission spectra and minimal interference. Hence, the RTP properties of QDs and their potential for phosphorescence detection have drawn more and more attention. In this paper, N-acetyl-L-cysteine (NAC)-capped Mn-doped ZnS QDs were synthesized by a hydrothermal method. The QDs displayed a strong phosphorescence emission peak at 590 nm upon excitation at 315 nm. Because their RTP was efficiently quenched by hydrochlorothiazide (HCT), a novel RTP method for determination of HCT was developed. The results showed that under the optimized conditions, the changes of RTP intensity showed a good linear relationship with the concentration of HCT in the range of 2.5 to 95 μM, with a limit of detection of 1.25 μM and relative standard deviation of 0.44%. The related theories preliminarily demonstrated the dynamic quenching mechanism. In addition, this method was successfully applied to the analysis of practical samples. The recovery of spiked solutions ranged from 94–104%.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jie Yao,Chengyi Li,Jianxin Feng,Bei Wei,Rongrong Xing,Shurong Ban,Li Tang,Bin Liu
Nanozymes with high peroxide (POD)-like activity have great practical potential in the colorimetric sensing of biomolecules in the medical and biological fields. However, their applications are limited by some disadvantages such as their low catalytic activity and poor biocompatibility. While designing and synthesizing nanozymes, elemental doping is used as an effective method to improve their enzymatic activity. Herein, CeO2 nanorods doped with different concentrations of Mn were synthesized via the hydrothermal method. Mn doping effectively improved the POD-like activity of the CeO2 nanorods. Notably, MnCe0.1 exhibited superior POD-like activity to that of CeO2. The improvement in the catalytic activity of MnCe0.1 was attributed to the presence of more exposed active sites and more oxygen vacancies compared with those of CeO2 nanorods. Using its excellent POD-like activity, the developed system exhibited linear detection ranges of 10–100 μM and 2.5–20 μM and detection limits of 1.94 μM and 0.37 μM for H2O2 and glutathione detection, respectively. Additionally, the developed MnCeX nanomaterials exhibit remarkable temporal stability and reusability. Finally, considering the excellent POD-like activity of MnCe0.1 nanozymes, they have good prospects for cancer treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guangqin Gong,Jieshu Zhou,Xiulan Guo,Ruiyan Xie,Xiangke Zeng,Min Zhang,Kangni Wen,Tianding Hu,Shaoyun Shan,Kaili Yao
The development of efficient electrocatalysts for oxygen evolution (OER) is very important for the practical application of water decomposition technology. Promoting the formation of high-oxidation-state transition metal species in a hydroxide catalyst may improve its catalytic activity in the oxygen evolution reaction, which remains difficult to achieve with current synthetic strategies. Herein, we reported the synthesis of Fe x Mn y-x nanosheets on nickel foam substrate subsequently by phosphating treatment (Fe x Mn y-x P/NF). The Mn-mediated and phosphating synergistic promoting the formation of high-oxidation-state Ni and/or Fe for improved oxygen evolution activity. In-situ Raman spectroscopy showed that the incorporation of Mn and P into the NiFe hydroxide caused a cathodic shift of the NiFe hydroxide (2 + ) to NiFeOOH (3 + δ) transition potential. Density functional theory calculations suggested that an elevated oxidation state for NiFe by Mn-mediated decreased the energy barriers of the rate-determining step (*OH → *O). As a result, an overpotential of 208 mV was achieved at a current density of 10 mA cm −2 in 1 M KOH. This work provides a new strategy and a deep insight into the construction of efficient NiFe-based water oxidation electrocatalysts.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Qiangshuai Wang,Sengui Liang,Jinshuo Liu,Yuanyuan Xie,Qi Pang,Zhao-Qing Liu,Yibo Chen
Photocatalytic conversion of carbon dioxide (CO2) to carbon-based fuels is a promising approach to alleviating environmental and energy problems. Therefore, designing photocatalysts with morphological structures that favor gas–solid reactions and exhibit exceptional catalytic efficiencies is strongly demanded. In this work, a porous-framed heterostructure, constructed by anchoring Cs4PbBr6 perovskite nanocrystals on MnO2 hollow spheres, exhibits a 1.8-fold enhancement in the total electron consumption rate (95.3 μmol g–1 h–1) for CO2 photoreduction compared to the original Cs4PbBr6 nanocrystals. Detailed optoelectronic characterizations and theoretical calculations demonstrate that the electronic interactions in the heterointerface trigger disproportionation of Mn and help to expose active Mn sites that attract electrons, thus improving the CO2 activation and the following hydrogenation step to produce COOH*. The open and through porous structure also contributes to the enhanced reaction rate by accelerating mass transfer during the photoreduction reaction. This study provides valuable insights for the development of efficient catalysts for CO2 photoreduction in gas–solid reactions.
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高影响因子
Journal of Material Cycles and Waste Management
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2024
·
IF 2.7
Zhu Wenzhong,Zhu Xueting,Shen Weijian,An Nan,Wu Lina
Antibiotics are extensively employed in the treatment of human and animal ailments. However, their excessive use and poor biodegradability have led to a notable accumulation of antibiotics in the environment, presenting potential health hazards to humans. In this study, tetracycline (TC) was selected as a representative antibiotic, and a recyclable material, Mn-ZIF-67, was synthesized to degrade TC through adsorption and peroxidase-like activity. Mn-ZIF-67 significantly enhances the peroxidase-like activity of ZIF-67. The removal efficiency of TC was boosted by 300% compared to ZIF-67 within a 10-min timeframe. With its high catalytic activity and stability, Mn-ZIF-67 exhibits significant promise for the swift degradation and elimination of antibiotics from the environment.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Qingqing Zhu,Xingyu Shi,Xiaojuan Zhang,Xing Zhang,Yizhong Wang,Chunchang Wang
Ultrasonic vibration and light irradiation can be used together to slow down the rapid recombination of light-induced charges during the catalytic process. One way to enhance the catalytic performance is by introducing different elements into the structure. In this study, pure bismuth ferrite (BiFeO 3 ) and manganese (Mn)-doped bismuth ferrite (BFMO) nanomaterials were successfully synthesized by electrostatic spinning. These materials were then tested for their ability to degrade rhodamine B (RhB). The best-performing material was BiFe 0.85 Mn 0.15 O 3 , which achieved almost complete removal of RhB within 100 min. The degradation rate of this material was 3.3 times higher than that of pristine BiFeO 3 . This enhanced catalytic activity can be attributed to the wider range of light absorption and the synergistic enhancement of the piezoelectric response, which promotes the movement of free carriers. In addition, the synthesized catalysts have good stability and reusability , with little metal leaching after multiple uses. Free radical scavenging experiments tests showed that ·OH and holes are the main active species in the catalytic process. This work paves a new approach for creating highly efficient piezoelectric catalysts and expands the application of BiFeO 3 -based materials for wastewater purification.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Jianing Cheng,Yanan Li,Wei Qu,Min Sun,Yiwen Liu,Wangzhou Shi,Weijie Du,Yiwen Zhang
Mn-doped CsPbCl 3 nanocrystals are considered to be a promising material for luminescence and display applications owing to Mn doping provides a way to introduce new optical properties and reduce the use of toxic Pb. Complicate ion-exchange and hot-injection are commonly used for the fabrication of the nanocrystals. Developing a fast and efficient synthesis method remains a challenge so far. Herein, we developed a simplified solid-state mechanochemical approach to synthesize Mn-doped CsPbCl 3 nanocrystals and investigated the structure and luminescence properties of the as-synthesized nanocrystals. Cubic morphology of Mn-doped CsPbCl 3 nanocrystals with average size of 13 nm have been obtained by this approach. Mn was successfully incorporated in CsPbCl 3 perovskite nanocrystals , resulting in a high photoluminescence quantum yield of 40.7% with an improvement of stability. Emission peak of 594 nm that can be assigned to the luminescence of Mn 2+ d-d transition was observed under 365 nm UV excitation. The color of the luminescence changed from blue to warm white to yellow depended on the amount of Mn doping, exhibiting a tunable-color property. It is expected that this approach provides an effective route that would help for synthesis of perovskite nanocrystals doped with different dopants .
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高影响因子
ACS Nano
·
2017
·
IF 13.942
Huiwen Liu,Zhennan Wu,Jieren Shao,Dong Yao,Hang Gao,Yi Liu,Weili Yu,Hao Zhang,Bai Yang
CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) are potential emitting materials for illumination and display applications, but toxic Pb is not environment- and user-friendly. In this work, we demonstrate the partial replacement of Pb with Mn through phosphine-free hot-injection preparation of CsPbxMn1–xCl3 QDs in colloidal solution. The Mn substitution ratio is up to 46%, and the as-prepared QDs maintain the tetragonal crystalline structure of the CsPbCl3 host. Meaningfully, Mn substitution greatly enhances the photoluminescence quantum yields of CsPbCl3 from 5 to 54%. The enhanced emission is attributed to the energy transfer of photoinduced excitons from the CsPbCl3 host to the doped Mn, which facilitates exciton recombination via a radiative pathway. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. A light-emitting diode (LED) prototype is further fabricated by employing the as-prepared CsPbxMn1–xCl3 QDs as color conversion materials on a commercially available 365 nm GaN LED chip.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 4
·e4648
·
IF 3.259
Zi-Feng Yao,Zhen-Xiang Dai,Zhan-Jun Zhang,Gan-Hong Zheng,Xin Xu
Mn-doped SrMoO 4 nanocrystals were synthesized by thermal decomposition of metal–organic salt in an organic solvent with the doping content in the range 0–12 mol%. The structures, morphologies and optical properties were characterized using various techniques. The results suggest that Mo sites in the SrMoO 4 lattice are substituted by the Mn dopant, the adsorption bands are found to be shifted toward the visible light region and the band gap becomes narrower correspondingly. The photocatalytic performance of the as-synthesized product was determined using the degradation of methylene blue by visible light irradiation. The photocatalytic performance is enhanced with Mn doping, and the optimal degradation rate is 85% in 140 min for 5 mol% Mn doping. The enhanced photocatalytic activity with Mn doping may be ascribed to the energy band adjustment and effective photogenerated electron–hole separation caused by the Mn doping. A possible photocatalytic mechanism is also discussed.
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