CHINESE JOURNAL OF CATALYSIS
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2025
·
IF 17.7
Bingjie Zhang,Chunyan Wang,Fulin Yang,Shuli Wang,Ligang Feng
Bifunctional Ir catalysts for proton exchange membrane (PEM) water electrolysis offer transformative potential by streamlining electrolyzer while achieving efficient performance remains challenging due to the distinct conditions required for oxygen and hydrogen evolution reaction (OER and HER). Herein, we propose a theory-directed design of Ir-based bifunctional catalysts, Ir nanoparticles supported on mesoporous carbon spheres embedded with MoSe 2 (Ir/MoSe 2 @MCS), leveraging a work function (WF)-induced spontaneous built-in electric field to enhance catalytic performance. They demonstrate exceptional kinetics for both OER and HER, and potential application in the practical PEM electrolyzer, showcasing the effectiveness of this innovative approach. Low overpotentials of 252 mV for OER and 28 mV for HER to drive 10 mA cm –2 were observed, and the PEM electrolyzer showed the current density of 2 A cm –2 at 1.87 V and maintained stable activity at 1.65 V for over 30 h to deliver 1 A cm –2 . Density functional theory calculations reveal that the WF difference at Ir/MoSe 2 interface induces a spontaneous built-in electric field with asymmetric charge distributions, that modulate the electronic environment and d -band center of Ir promoting bifunctional active phase formation. This significantly lowers reaction barriers for water splitting by balancing intermediate adsorption, endowing the bifunctional activity.
研究领域:
电化学
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催化
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材料科学
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能量转换
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lingjun Zhou,Wenyan Zheng,Muzhi Cai,Feifei Huang,Ying Tian,Shilong Zhao,Liaolin Zhang,Junjie Zhang
The TeO 2 -ZnO-Na 2 O glass system demonstrates significant promise for mid-infrared laser applications due to its high refractive index and low phonon energy, although it is inherently limited by poor thermal stability. Traditional methods aimed at enhancing thermal stability, such as the incorporation of intermediates, typically result in compromised optical performance. However, this study introduces a synergistic optimization strategy through strategic Ta 2 O 5 doping. A systematic analysis utilizing Differential Scanning Calorimetry (DSC), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and photoluminescence (PL) spectroscopy has uncovered a novel correlation between optical performance and average rather than maximum phonon energy. This discovery provides a refined theoretical framework for the design of tellurite glasses. The optimized Tm 3 -doped TZNT4 glass, with a glass transition temperature ( T g ) of 388 °C and a thermal stability range ( ΔT ) of 137 °C, demonstrates excellent absorption (9.1 ×10 −21 cm 2 ) and emission cross-sections (7.1 ×10 −21 cm 2 ) at 2 μm. This work establishes a structure-property-performance paradigm for tellurite glasses, effectively addressing the critical trade-off between thermal robustness and mid-infrared emission performance through rational composition engineering.
研究领域:
材料科学
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光学
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固体物理
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红外技术
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玻璃工程
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产品关联
DOI
高影响因子
Nature Nanotechnology
·
2025
·
IF 34.9
Teng Zhenyuan,Zhang Zhenzong,Tu Ying,Zhang Qitao,Jian Nan,Yang Liujun,Xiao Jiadong,Ding Jie,Huang Longzhen,Teruhsia Ohno,Wang Chengyin,Zhang Dengsong,Yu Han,Lu Jianmei,Su Chenliang,Liu Bin
Selective asymmetric oxidation of glycerol (GLY) to hydroxypyruvic acid (HPA) offers an attractive approach for chiral drug synthesis, but this process is highly challenging. Here we develop a photocatalytic method to achieve heterogeneous selective photooxidation of GLY to HPA over rubidium (Rb) and iridium (Ir) catalytic pairs decorated on a poly(heptazine imide) framework. The Rb sites effectively adsorb GLY molecules through the terminal –OH groups, thus inhibiting their oxidation during photoreaction, while the Ir sites enhance the oxygen reduction reaction and the in situ generated surficial oxygen-reduction radicals on Ir can protect the reactive C-centred radical intermediates produced during photooxidation. The spatial arrangement of Rb and Ir sites facilitates hydrogen extraction—an essential rate-determining step for GLY photooxidation—and protects C3 radical intermediates from overoxidation. This photocatalytic system achieves a remarkable productivity for HPA synthesis (~8,000 μmol of HPA per gram of photocatalyst per hour) under visible-light illumination.
研究领域:
化学工程
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材料科学
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光催化
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jian Ding,Zhen Li,Yongchao Wang,Yi Liu,Fei Li,Xinru Yu,Peiqi Huang,Yang Wang
Thermally excited oxygen activation is the key to realize gas sensing by semiconductor. However, the relevant strategies and mechanisms are rarely studied. Herewith, the model material of highly oxygen catalytic active Ir doped WO 3 (Ir-WO 3 ) is prepared to elucidate the impact of enhanced oxygen activation on sensing performance. Interestingly, the 0.5 wt% Ir doped WO 3 successfully reduced the working temperature of WO 3 from 370 to 260 ℃ and significantly enhanced the response from 25.1 to 127.9 (at 50 ppm) for acetone. Meanwhile, the sensor also has fast response/recovery times (∼8.3/3.8 s), long-term stability, low detection limit (19 ppb) and high selectivity. Gas sensitive performance tests, in situ -DRIFTS and DFT calculations reveal that the Ir doping facilitates the oxygen adsorption and activation, which can significantly weaken the activation energy of acetone at low temperatures and contribute to enhance sensing performance. Our work paves a new pathway to improving metal oxide-based gas sensors at lower operating temperatures.
研究领域:
材料科学
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传感器技术
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催化化学
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产品关联
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
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2022
·
IF 5.755
Na Wang,Yaxin Guo,Jiarong Li,Shufeng Pang,Yunhong Zhang
Water-soluble amino acids have been confirmed as effective cloud condensation nuclei (CCN) materials. While their influence on the hygroscopicity of nitrates is still scarcely known. In this work, ammonium nitrate (AN) was mixed with glycine and alanine at various mole ratios to form internally mixed particles deposited onto a solid substrate, whose hygroscopic properties and phase states of ingredients were investigated using microscope and attenuated total reflection-Fourier transformed infrared spectroscopy (ATR-FTIR). For mixed AN/amino acid particles with abundant inorganic, AN crystallizes at lower RH than that of pure AN, while deliquescence relative humidities (DRHs) were close to pure AN. On hydration, the mixture composed of bis(amino acid) nitrates and mono(amino acid) nitrates formed at 14.6–60.8% RH and 23.6%–60.0% RH for AN/glycine and AN/alanine particles, respectively. When the inorganic and organic components were mixed with equal mole ratio, gradual water uptake and release took place due to the hygroscopic interplay between components. In the mixed particles with abundant amino acids, glycine and alanine still kept solid at highest RH on hydration. Hydrogen bonding interaction should account for the mutual suppression on individual crystal formation. The present hygroscopic study would help people understanding cloud condensation nuclei (CCN) ability of amino acids in atmosphere.
研究领域:
大气科学
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化学
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 16
·165502
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IF 3.551
Muhammad Imran Saleem,Shengyi Yang,Muhammad Sulaman,Jinming Hu,Perumal Veeramalai Chandrasekar,Yuansheng Shi,Ruonan Zhi,Attia Batool,Bingsuo Zou
Colloidal quantum dots (CQDs) are very promising nanomaterials for optoelectronics due to their tunable bandgap and quantum confinement effect. All-inorganic CsPbX3 (X = Br, Cl and I) perovskite nanocrystals (NCs) have attracted enormous interests owing to their promising and exciting applications in photovoltaic devices. In this paper, all-solution-processed UV-IR broadband trilayer photodetectors ITO/ZnO/PbS/CsPbBr3/Au and ITO/ZnO/CsPbBr3/PbS/Au with high performance were presented. The role of CsPbBr3 QDs layer as the carriers-extracting layer in the trilayer devices was discussed. As compared with bilayer device ITO/ZnO/PbS/Au, both the dark currents and photocurrents under illumination from trilayer photodetectors are enhanced, but the trilayer photodetector ITO/ZnO(80 nm)/PbS(150 nm)/CsPbBr3(50 nm)/Au showed a maximum specific detectivity (D*) of 8.3 × 1012 Jones with a responsivity (R) of 35 A W−1 under 1.6 mW cm−2 980 nm illumination. However, another trilayer photodetector ITO/ZnO(80 nm)/CsPbBr3(50 nm)/PbS(150 nm)/Au showed a maximum D* of 1.73 × 1012 Jones with a R of 5.31 A W−1 under 6.8 mW cm−2 405 nm illumination. Further, the underlying mechanism for the enhanced performance of trilayer photodetectors was discussed. Thus, this strategy of all-solution-processed heterojunction configuration paves a facile way for broadband photodetectors with high performance.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
Energy Materials
·
2026
·Vol. 6
·期 3
·N
·
IF 11.9
Zhengxi Zhao\u003Csup\u003E1,2,\u003C\u002Fsup\u003E,Liwei Sui\u003Csup\u003E3,\u003C\u002Fsup\u003E,Ziqi Wang\u003Csup\u003E2\u003C\u002Fsup\u003E,Shiwei Song\u003Csup\u003E2\u003C\u002Fsup\u003E,Jian Wang\u003Csup\u003E2\u003C\u002Fsup\u003E,Yucai Li\u003Csup\u003E2\u003C\u002Fsup\u003E,Depeng Zhao\u003Csup\u003E2\u003C\u002Fsup\u003E,Guanglong Li\u003Csup\u003E3\u003C\u002Fsup\u003E,Lihua Miao\u003Csup\u003E1,2,*\u003C\u002Fsup\u003E
Alkaline water electrolysis offers a promising route for large-scale hydrogen production, but its efficiency is limited by the sluggish kinetics of both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Herein, we designed a hierarchical composite electrocatalyst comprising iridium-doped nickel-cobalt phosphide nanoparticles (Ir-NiCoP/Ni5P4) encapsulated within nickel-iron layered double hydroxide nanosheets (NiFe-LDH). Oxygen vacancies (OV) were engineered on the surface via sodium borohydride reduction, yielding an optimized catalyst denoted as Ir-NiCoP/Ni5P4@NiFe-LDH-1-OV. The optimized catalyst delivers low overpotentials of 52.7 mV for HER and 197.3 mV for OER at 10 mA cm-2 and maintains remarkable stability over 100 h for overall water splitting. Moreover, the Ir-NiCoP/Ni5P4@NiFe-LDH catalyst exhibits overpotentials of 76.7 and 101.3 mV for HER and the ammonia oxidation reaction A in 1 M KOH + NH3·H2O, respectively.
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Yifan Zhu,Chunxiang Liu,Hanlu Zhang,Zihan Zhou,Yunbo Jiang,Teng Wang,Yuzhou Liu
As a clean and renewable energy, hydrogen gas can be generated from water electrolysis which also involves the sluggish oxygen evolution reaction (OER). The main commercial catalysts for OER are Ir and Ru based but have the problems of high cost and poor cycling stability. Herein, we designed a new electrocatalyst based on Ni, Fe and Ir compounds loaded on a unique two-dimensional carbon material, which can efficiently catalyze OER with high stability in alkaline solution. The composite was prepared by physical vapor deposition, showing a fibrous microscopic morphology with uniform particle size distribution. The fibrous structure ensured the exposure of active sites, which further improved OER activity. The loading of metallic iridium in the material is only 0.0858 mg cm −2 . The catalytic activity of OER was maintained for 54 h under alkaline conditions at a current density of 50 mA cm −2 without significant changes in current density. Characterization showed that the excellent activity and stability of the catalysts originated from the Ir insertion into the NiFe 2 O 4 lattice.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 9
·4955-4968
·
IF 3.809
Li Weijie,Zhang Fengying,Wang Weiku,Li Yinhui,Liu Yaodong,Lu Chunxiang,Zhang Zhengfang
Abstract
Cellulose was dissolved in LiCl/DMAc solvent system at various concentrations. Using rheological measurements, we observed that the cellulose solution becomes gelled upon heating and jelly-like during cooling. Interestingly, while phase separation occurs during heating (from room temperature to higher) along with a sol–gel transition, and this transition is irreversible, the cooling (from room temperature to lower) induced solution property transition from more viscous to more elastic is completely reversible. The structural changes of cellulose solution during heating and cooling cycles are in situ monitored by infrared spectroscopy, and we found that the temperature of the solution affects the interactions among DMAc, lithium cations, chloride anions, and the hydroxyl groups in cellulose chains. While heating induces phase separation and gelation of cellulose solutions, cooling simply turns the solution into a reversible jelly status. Also, when cellulose concentration increases, the gelation temperature caused by heating becomes significantly lower. Possible mechanisms of the rheological transitions of cellulose/LiCl·DMAc solutions during either heating or cooling are proposed in this study. Graphical abstract
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Huan Liu,Lei Liu,Wen-Di Guo,Yong Lu,Xiao-Li Zhao,Ye Liu
The complexation of IrCl 3 ⋅3H 2 O with the electron-deficient phosphines ( L1 - L6 ) respectively afforded a bi-functional catalyst possessing the dual functions of transition metal complex (Ir III -P) and Ir III -Lewis acid for tandem hydroformylation-acetalization of olefins. The best result was obtained over L5 -based IrCl 3 ⋅3H 2 O catalytic system which corresponded to 97% conversion of 1-hexene along with 92% selectivity to the target acetals free of any additive. The crystal structure of the novel Ir III -complex of Ir III -L4 indicated that the electron-deficient nature of the involved phosphine warranted Ir-center in +3 valence state without reduction, which served as the Lewis acid catalyst for the subsequent acetalization of the aldehydes as well. Moreover, as an ionic phosphine, L6 -based IrCl 3 ⋅3H 2 O system immobilized in RTIL of [Bmim]PF 6 could be recycled for 6 runs without the obvious activity loss or metal leaching.
研究领域:
化学
·
催化化学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Zhiyan Li,Xianghui Li,Yanjun Lu,Xudong Zhu,Wenxuan Zheng,Kai Chen,Song Liu,Jinhui Wu,Wenxian Guan
Photodynamic therapy (PDT) has promising applications. However, the lethal function of reactive oxygen species (ROS) produced during PDT is typically limited. This restriction is induced by oxygen shortage in the tumor microenvironment due to tumor cell hypermetabolism and reductive chemicals overexpression in tumor tissues. Glutamine (Gln) metabolism is crucial for malignancy development and is closely associated with redox. Herein, a novel nanoparticle (NP) named IRCB@M is constructed to boost PDT through dual effects. This NP simultaneously blocks aerobic respiration and inhibits cellular reduced substances by blocking the Gln metabolic pathway. Within the nanocomplex, a photosensitizer (IR-780) and a glutaminase inhibitor (CB-839) are self-assembled and then encapsulated by cancer cell membranes for homologous targeting. The Gln metabolism intervention relieves hypoxia and decreases the levels of nicotinamide adenine dinucleotide phosphate (NADPH) as well as reduced glutathione (GSH) in vitro and in vivo, which are the dual amplification effects on the IR-780-mediated lethal PDT. The antitumor effects against gastric cancer are ultimately evoked in vivo, thus offering a novel concept for enhancing PDT and other ROS-dependent therapeutic approaches.
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2014
·
IF 0
Min Jiang,Dandan Zhu,Xuebo Zhao
Electrolysis of ammonia in alkaline electrolyte solution was applied for the production of hydrogen. Both Pt-loaded Ni foam and Pt-Ir loaded Ni foam electrodes were prepared by electrodeposition and served as anode and cathode in ammonia electrolytic cell , respectively. The electrochemical behaviors of ammonia in KOH solution were individually investigated via cyclic voltammetry on three electrodes, i.e. bare Ni foam electrode, Pt-loaded Ni foam electrode and Pt-Ir loaded Ni foam electrode. The morphology and composition of the prepared Ni foam electrode were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Effects of the concentration of electrolyte solution and temperature of electrolytic cell on the electrolysis reaction were examined in order to enhance the efficiency of ammonia electrolysis. The competition of ammonia electrolysis and water electrolysis in the same alkaline solution was firstly proposed to explain the changes of cell voltage with the electrolysis proceeding. At varying current densities, different cell voltages could be obtained from galvanostatic curves. The low cell voltage of 0.58 V, which is less than the practical electrolysis voltage of water (1.6 V), can be obtained at a current density of 2.5 mA/cm 2 . Based on some experimental parameters, such as the applied current, the resulting cell voltage and output of hydrogen gas , the power consumption per gram of H 2 produced can be estimated.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）