Journal of Saudi Chemical Society
·
2015
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IF 2.523
Lijie Wang,Xi Zhang,Peng Zhang,Zetan Cao,Junhua Hu
Mn doped TiO 2 was synthesized by hydrothermal treatment of titanium boride and manganese chloride. The doped nano powders were fabricated by adding ammonium water into the mother solution which was obtained hydrothermally. The calcination of precursory powders took place at the temperature of 400–600 °C which resulted in the formation of anatase with a small amount of rutile phase. The shift of valence band maximum (VBM) toward the lower binding energies was observed by measuring the position of VBM with reference to the Fermi level, which contributed to the significant red-shift of absorption edges. X-ray photoelectron spectroscopy (XPS) measurement shows that manganese exists in both 4+ and 3+ valance states, which may have a temperate replacing of Ti 4+ because of the charge compensation compared with 2+ and 3+ valence states. The property of photoelectric conversion was detected by evaluating the photocurrent under visible light (>420 nm), and the fluorescence spectra also proved that 6%-Mn doped TiO 2 (DM6) shows a better photoelectric conversion performance.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Dongwei Zhou,Shihao Wang,Jiansen Wen,Jie Mei,Guiyang Gao,Saichao Li,Baisheng Sa,Jie Lin,Laisen Wang,Guoying Wei,Dong-Liang Peng,Qingshui Xie
Li-rich Mn-based cathode materials, single-solvent, nonflammable feature, high voltage stability, solvation structure
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Molecular Catalysis
·
2025
·
IF 4.9
Rui Zhu,Fang Gao,Xinglong Li
The development of efficient catalysts for the stepwise oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformyl furan (DFF), 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), 5-Formyl-2-furancarboxylic acid (FFCA) or 2,5-furandicarboxylic acid (FDCA) is critical for biomass valorization. Herein, we reported a bimetallic Co-Mn catalyst anchored on nitrogen-doped porous carbon, which was used for the oxidation of HMF to FDCA, avoiding the use of high temperature and high-pressure oxygen. High FDCA selectivity (>95 %) was achieved through reaction condition optimization. And HMF→DFF→FFCA→FDCA was considered to be the main reaction pathway during the whole oxidation process. Additionally, the chemical environment of the constituent elements of the used catalyst was analyzed by XPS. TEM revealed that the catalyst retained its porous structure and excellent metal dispersion after the reaction. This structural stability was corroborated by sustained >90 % FDCA selectivity over five consecutive reaction cycles. This work established a dual-metal synergy strategy for multi-step oxidation pathways, offering insights into the design of robust catalysts for biomass-derived platform molecule upgrading.
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Advanced Optical Materials
·
2023
·Vol. 12
·期 11
·2302434
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IF 9
Zhi-Zhong Zhang,Zi-Lin He,Jian-Bin Luo,Jun-Hua Wei,Xiu-Xian Guo,Jing-Hua Chen,Dai-Bin Kuang
The current mainstream planar X-ray imaging techniques face significant challenges for accurately capturing the internal structure of curved objects, since the variable distances between the curved objects and the flat-panel scintillation screen cannot eliminate the distortion in X-ray imaging. Though large-area and transparent curved scintillation screens are much more desirable. Here, organic–inorganic hybrid Mn-based single crystals ([CH 3 Ph 3 P] 2 MnX 4 , X = Cl, Br, I) exhibiting high photoluminescence quantum yield (PLQY) and low melting temperature have been employed to prepare transparent glass for X-ray scintillation imaging application through a low-temperature melting strategy. The [CH 3 Ph 3 P] 2 MnBr 4 -glass shows high PLQY (47.8%), high-resolution X-ray imaging performance (12.3 lp mm −1 ), low limit of detection (25.33 nGy s −1 ), and impressive X-ray irradiation stability (102 Gy). Furthermore, high-contrast X-ray imaging at a low dose (6.865 µGy per exposure, 14.5 times lower than the chest radiograph) is achieved. Based on the low glass transition temperature ( T g = 53.6 °C) and easy-shapeable properties of [CH 3 Ph 3 P] 2 MnBr 4 -glass scintillator, the large-area curved scintillation screen with a series of sizes of Φ 2×4 – Φ 8×4 cm 2 can be easily fabricated and show high X-ray imaging quality. These findings provide a paradigm for future research in shapeable X-ray scintillators, unlocking new possibilities for curved and 3D X-ray imaging.
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Materials Today Chemistry
·
2022
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IF 7.613
X. Zhou,M.-H. Zhao,J. Yang,Y. Han,L. Cao,Y.-Y. Han,J. Wang,Y. Wang,M.-R. Li
Environment-friendly and cost-effective versatile yellow-green inorganic pigments are technically significant for natural camouflage but rare. Here, we adopt site-selective parent-doping of Mn–Li into the octahedral Ca-site (Ca B ) of Ca 3 TeO 6 to deliver vivid greenish pigments by the unprecedented yellow-green Mn 4+ O 6 chromophore, yielding tunable pigments resemble to seasonal leaves. The camouflage color zone of these pigments are remarkably enlarged by chemical pressure via Mg 2+ /Sr 2+ -substitution for the A -site Ca (Ca A ). The locally anisotropic and positive chemical pressure on chromophore group is scaled to be around +14.4/+23.3 GPa, as estimated from the accompanied geometric evolution of Mn 4+ O 6 . The achieved pigments also demonstrate excellent chemical and thermodynamic stability and high (60–80%) near infrared reflectivity in 1500–2500 nm, showing potential applications for natural camouflage and yellow-green “cool pigments”. These findings built a bridge between chemical and equivalently physical pressure, and nominated a way to estimate the overall and local strain/pressure by optical descriptor.
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AIP Advances
·
2022
·Vol. 12
·期 3
·
IF 1.697
Wu Yao,Kong Lingce,Zhang Xiuling,Guo Yueting,Sun Yaxin,Zhao Chonglin,Chen Wenming,Zuo Yanjun,Li Congju
Protection against harmful chemical compounds is a major social concern, especially chemical warfare agents (CWAs) that are easy to synthesize and can cause mass casualties. The metal oxides with large surface area, porous structures, and a large number of active sites have shown outstanding performance for the adsorption and decontamination of CWAs. However, single-component metal oxides show a lower degradation rate for chemical warfare agents. Here, we demonstrate a convenient homogeneous hydrolysis method for the synthesis of mesoporous manganese-based multi-component metal oxides. Our strategy enables Ce or/and Zr to be doped into the δ-MnO 2 structure during the forming process, remarkably enlarging the surface area and providing rich active sites for CWA catalysis. The as-synthesized multi-component metal oxides exhibit excellent performance for the CWA degradation. It is surprising to find that the best degree of removal of mustard gas (HD), soman (GD), and the VX nerve agent (VX) is 90.60%, 87.32%, and 100%, respectively, reaction with multi-component samples in 4 h, 2.92-fold increase to HD, 8.28-fold increase to GD, and 1.67-fold increase to VX contrast with undoped δ-MnO 2 . This work may provide an avenue for developing new generation chemical warfare agent decontamination materials and other catalysts.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 7
·2002175
·
IF 6.147
Lu Hou,Yihua Zhu,Jingrun Zhu,Xuyan Li,Feng Zeng,Tingyu Yang,Yiqin Gong,Jianhua Shen,Chunzhong Li
Mn-doped 2D perovskites are emerging as good candidates for light-emitting applications due to their excellent optical and electrical properties. Major synthetic routes, solid-state grinding and high-temperature solution synthesis, are extensively studied to prepare Mn-doped 2D perovskites. However, complicated synthesis, small-scale yields, and poor-stability impede their widespread applications. Herein, a one-step acid-solution-assisted method is exhibited for gram-scale production of Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 with a solid yield of 1.35 g products out of 3 mL solvent. After Mn-doped 2D (C 8 H 17 NH 2 ) 2 PbBr 4 being stored in the air for 90 days, the photoluminescence (PL) quantum yield of powders has minor changes, showing good stability. Phosphor-converted monochrome light-emitting diodes (LEDs) are fabricated. After the LEDs work 6 h under a voltage of 3 V, their PL spectra have no obvious change, showing a great potential in optoelectronic devices. This study provides a new effective strategy for large-scale synthesis of ultrastable Mn-doped 2D perovskites, which is expected to provide inspiration for the industrial optoelectronic applications of perovskites.
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 48
·485403
·
IF 3.953
Martine Otay Lifoka,Weixing Niu,Guihua Liu,Changcheng Wu,Jingde Li
Non-precious and stable electrocatalysts towards both oxygen and hydrogen evolution reaction (OER/HER) are essential for effective overall water splitting in alkaline solution. In this study, a sulfur defective and manganese-doped nickel sulfide nanosheet that uniformly grown on nickel foam substrate (Mn–Ni3S2–x@NF) is synthesized. In alkaline solution, the Mn–Ni3S2–x@NF showed a low overpotential of 76 and 110 mV for OER and HER at 10 mA cm−2, respectively, together exhibiting excellent stability for both OER and HER reaction. It was confirmed by the experimental results that sulfur defects and Mn-doping synergistically optimized the electronic structure of Mn–Ni3S2–x with increased electrical conductivity and enhanced OER/HER activity. Moreover, amorphous nickel oxyhydroxide (NiOOH) was observed by in situ Raman during the OER condition, suggesting NiOOH is the active phase for OER reaction. Furthermore, the electrolyzer assembled by Mn–Ni3S2–x@NF merely needs 1.46 V to reach 10 mA cm−2 and shows good stability as well. This study provides a feasible way to prepare high-efficiency bifunctional catalysts for overall water splitting.
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CATALYSIS TODAY
·
2024
·
IF 5.2
Xiaoyu Zhang,Xin Xu,Xinyu Wang,Huibin Liu,Mingli Fu
The improvement of catalytic efficiency is of great significance to the removal of volatile organic compounds (VOCs), a class of key air pollutants leading to ground-level ozone pollution. Herein, a series of micro-spherical Ca-Mn mixed oxides (Ca x Mn y O z ), namely CaMn 3 O 6 , Ca 2 Mn 3 O 8 and CaMnO 3 , were prepared by a two-step precipitation method, and defects were constructed on which by selective dissolution to enhance the low-temperature catalytic performance in the oxidation of propane (C 3 H 8 ) as a representative short-chain alkane VOCs. The synthesized Ca x Mn y O z oxides demonstrated drastically different response to the dissolution modification initiated by acid treatment. Specifically, after acid dissolution, while CaMn 3 O 6 and Ca 2 Mn 3 O 8 maintained largely their original structures, the perovskite-type CaMnO 3 underwent lattice rearrangement and was transformed into γ-MnO 2 -like product with only a tiny amount of Ca. In C 3 H 8 oxidation, the catalytic performance of CaMnO 3 was significantly improved after selective dissolution, as indicated by a significant decrease of T 90 , i.e. the temperature to achieve 90% C 3 H 8 conversion, from 455 °C to 240 °C. Mechanistic investigation by in-depth X-ray photoelectron spectroscopy studies revealed that selective dissolution led to higher Mn 4+ concentrations and more oxygen vacancies on the oxide surfaces, thus facilitated electron transfer and O 2 activation in C 3 H 8 oxidation reactions. This study paves a new path for the design of cost-effective oxide catalysts toward the abatement of short-chain alkane VOCs.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Dapeng Li,Jinqiang Wu,Jiangtao Duan,Xiaoxu Liu,Jingjing Gong,Suxiang Ge
Exploring the practical method to grow high quality metal phthalocyanine (MPc) crystals and understanding their growth mechanism is significant for their applications. In this study, manganese phthalocyanine (MnPc) crystals were successfully synthesized using simple substance Mn and dicyanobenzene in the reaction medium of ethanediol without any other chemical reagents. The well shaped quadrangular MnPc crystals more than 500 μm were in situ grown on Mn slice surfaces via a simple solvothermal reaction. XPS analyses show that Mn has the mixed chemical state of +3 and + 4 in MnPc. Ethanediol acted as not only the solvent but also acidic catalyst to boost the ionization of dicyanobenzene. Different from the reported synthesis of MPc crystals, MnPc crystals could be formed at a wide temperature range of 100–190 °C. The reaction time is the only experimental parameter to regulate the crystal growth. To the best of our knowledge, this is the first report on in situ synthesis of the high quality MnPc crystals on Mn substrate by using a simple solvothermal method.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Xinli Wu,Weichao Qi,Hong Zhu,Yuhui Dong,Aocheng Jiang,Huanyang Chen,Hongtan Huang,Lu Han,Yousheng Zou
CsPbX 3 (X = Cl, Br, I) perovskites have been recognized as ideal candidates for light-emitting device applications due to their excellent optoelectronic properties, but the toxicity of lead has raised significant environmental concerns. Mn doping in lead-based perovskite nanocrystals (NCs) has been conducted to mitigate lead toxicity risks while enhancing photoluminescent performance. While high Mn concentrations can increase Mn–Mn defect states, complicating the balance between high photoluminescence quantum yield (PLQY) and low lead. In this study, a PLQY of 85.8% was achieved by precisely controlling the Mn/Pb feed ratio at a concentration of 11.37%. The enhancement in PLQY is attributed to reduced Cl vacancies, which lower defect states and non-radiative recombination rates. Stability was also improved through doping, and white light emitting diode (WLED) utilizing these materials exhibited color coordinates (0.3379, 0.3479) that closely approximate standard white light emission. This work provides a solution for achieving high-quality Mn 2+ doped perovskite NCs, and highlights its potential in solid-state lighting solutions while addressing lead toxicity concerns.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 33
·8990-8998
·
IF 5.976
Daqin Chen,Gaoliang Fang,Xiao Chen,Lei Lei,Jiasong Zhong,Qinan Mao,Su Zhou,Junni Li
All inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots have attracted extreme attention due to their excellent optical performance. Unfortunately, heavy usage of the toxic Pb element is still a serious problem that needs to be solved. In the present work, Mn-doped CsPbCl3 nanocrystals are successfully prepared via a facile solvothermal reaction for the first time. A high Cs-to-Pb feeding ratio is necessary to achieve pure cubic perovskite phase and the incorporation of Mn dopants into the CsPbCl3 host is highly related to the Mn-to-Pb feeding ratio. Importantly, it is demonstrated that Mn-doped CsPbCl3 NCs synthesized by the solvothermal method have better stability than those prepared by traditional hot injection. To finely adjust the bandgap of CsPbCl3 NCs, Cl-to-Br anion exchange is used to fabricate Mn-doped CsPb(Cl/Br)3 NCs with tunable multi-color luminescence. Finally, the as-prepared Mn-doped CsPb(Cl/Br)3 products are demonstrated to be applicable as color converters for constructing white light-emitting diodes and optical thermometric medium for accurate temperature sensing.
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