JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Weichun Yang,Dongdong Xi,Chaofang Li,Zhihui Yang,Zhang Lin,Mengying Si
Anionic Cr(VI) and cationic heavy metals generally co-exist in industrial effluents and threaten the public health. Zero-valent iron (ZVI) particles tent to passivate rapidly, which results in a gradual drop in its reactivity. In this work, a strategy of “in-situ synthesized” iron-based bimetal was first developed to stimulate the self-activation of passivated ZVI. During this process, ZVI-loaded hydroxyapatite (ZVI/HAP) was prepared to enhance the affinity for co-existing Cu 2+ , which promoted the in-situ Cu 0 deposition on ZVI/HAP to form a Fe–Cu bimetal. The deposited Cu 0 significantly decreased the activation energy (E a ) of Cr(VI) reduction by 24.9%, and its corresponding Cr(VI) removal (96.53%) was much higher that of single Cr(VI) system (68.67%) within 9 h. More importantly, the removal of Cr(VI) and Cu 2+ were synchronously achieved. Systematical electrochemical characterizations were first introduced to explore the galvanic behaviors of iron-based bimetal. The charge transfer resistance and the negative open circuit potential of ZVI/HAP significantly decreased with the Cu 0 deposition, thereby accelerating the electron transfer from Fe 0 to Cu 2+ . The enhanced electron transfer further facilitated the Fe(II) release to promote Cr(VI) reduction. This “in-situ synthesized” iron-based bimetal strategy provides a novel pattern for ZVI activation and exhibits practical application in remediation of combined contaminant.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 12
·6922-6931
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IF 3.502
Puxian Xiong,Chibin Zheng,Mingying Peng,Zhihao Zhou,Feifei Xu,Kexin Qin,Yiyu Hong,Zhijun Ma
Till now, many doped persistent luminescence (PersL) phosphors have been investigated and found various applications in such as bioimaging, photocatalysis and information storage, but introducing PersL emitters into a proper host is mostly complex. In this research, a self-activated PersL phosphor Ba 2 Zr 2 Si 3 O 12 (BZSO) is prepared by solid state reaction. By adding NH 4 Cl, the self-activated PersL intensity is evidently enhanced. The trap depths and concentrations are examined by thermoluminescence spectra. Meanwhile, Bi 3+ ions are introduced into BZSO and show wide band photoluminescence (PL) from 300 to 600 nm. Moreover, the PL of Bi 3+ is tunable under excitation by 265-350 nm lights. Furthermore, as a proof-of-concept design, we designed a patterned quick response (QR) code based on the self-activated PersL of BZSO, and the information of “South China University of Technology (SCUT)” can be read out by the code scanning technology. Bi 3+ -doped BZSO phosphors are suggested to provide potential applications in information storage by its self-activated PersL, and to excite researchers to study the tunable PL in Bi 3+ -doped phosphor.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Yong Li,Weining Song,Teng Gai,Lipeng Wang,Zhen Li,Peng He,Qi Liu,Lawrence Yoon Suk Lee
Molybdenum carbides are promising alternatives to Pt-based catalysts for the hydrogen evolution reaction (HER) due to their similar d -band electronic configuration. Notably, Mo x C exhibits superior HER kinetics in alkaline media compared to acidic conditions, contrasting with Pt-based catalysts. Herein, we present 3D porous β-Mo 2 C nanosheets, achieving an overpotential of 111 mV at 10 mA cm −2 in 1 M KOH, significantly lower than in acidic environments. Simulations on pristine Mo 2 C surface reveal that water dissociation poses a higher energy barrier in alkaline media, suggesting that crystal structure alone does not dictate kinetics. Operando attenuated total reflection surface-enhanced infrared absorption spectroscopy shows that Mo 2 C activates interfacial water, generating liquid-like and free water, and facilitates hydroxyl species adsorption, reducing activation energy to below 38.43 ± 0.19 kJ/mol. Our findings on the self-activation effect offer insights into the HER mechanism of Mo-based electrocatalysts and guide the design of highly active HER catalysts.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Min Jia,Xiangyu Zhang,Xue Yang,Zehao Lin,Dingjun Jia,Yuqiang Wang,Sining Yun,Dangli Gao
Multi-mode storage phosphors with photo/thermo/mechano-stimulated luminescence (PSL/TSL/ML) hold great potential applications in many fields such as biological imaging, human-machine interface, robotic manipulation, and stress/temperature visualization sensing. However, the physical mechanisms underlying this 'self-sustaining' luminescence are still debated, which in turn hinders the development of materials. Here, we demonstrated that the intrinsic defects such as the VO•• and Oi′′ in the matrix play an important role in the electronic structure and various physical properties of LiGa5O8 storage phosphor by combining first-principles calculations and experimental methods. Specifically, the intrinsic defects lead to the smaller bulk (B) and shear (G) modulus, Young’s moduli (E), Poisson’s ratio (v), B/G, and the bigger elastic anisotropy index (AU) and hardness (H) in three LiGa5O8 defect models, which is extremely advantageous for PSL/TSL/ML. We also demonstrate that the ML process, that is different from PSL/TSL processes, are intimately linked to the activation threshold of charge carriers in traps. This threshold can be lowered under axial stress by bandgap narrowing via weakening the binding force of polyhedral units to bind electrons in the converting process between mechanical energy and light energy under stress load. This study provides not only direct evidence for potential variation in ML process, but also guidance for designing the storage phosphors via defect engineering.
研究领域:
材料科学
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光学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2021
·
IF 9.028
Wenxiao Zheng,Liuyi Zhu,Zhang Yan,Zichao Lin,Zhenchao Lei,Yifan Zhang,Haolin Xu,Zhi Dang,Chaohai Wei,Chunhua Feng
Electrocatalytic reduction has recently received increasing attention as a method of converting waste nitrate into value-added ammonia, but most studies have focused on complex strategies of catalyst preparation and little has been done in the way of large-scale demonstrations. Herein, we report that in situ activation of a pristine Ni electrode, either on a lab scale or a pilot scale, is effective in facilitating nitrate reduction to ammonia, exhibiting extraordinarily high activity, selectivity, and stability. The self-activated Ni cathode has a robust capacity to reduce nitrate over a wide range of concentrations and achieves great conversion yield, NH4+–N selectivity, and Faradaic efficiency, respectively, 95.3, 95.5, and 64.4% at 200 mg L–1 NO3––N and 97.8, 97.1, and 90.4% at 2000 mg L–1 NO3––N, for example. Fundamental research indicates that Ni(OH)2 nanoparticles are formed on the Ni electrode surface upon self-activation, which play crucial roles in governing nitrate reduction reaction (NO3RR) through the atomic H*-mediated pathway and accordingly suppressing hydrogen evolution reaction. More importantly, the self-activated Ni(OH)2@Ni cathode can be easily scaled up to allow large volumes of real industrial wastewater to be processed, successfully transferring nitrate into ammonia with high yields and Faradaic efficiency. This study demonstrates a new, mild, and promising method of cleaning nitrate-laden wastewater that produces ammonia as a valuable byproduct.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 55
·36063-36071
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IF 4.036
Jie Li,Ruixia Shi,Yongqiang Cao,Qian Ma,Ling Chen,Aiyu Zhang,Ping Yang
Some of the metal vanadates have special self-activated luminescence. In order to further enrich its luminous color, luminescent impurity ions can be introduced into its lattice. The interaction between the self-activated emission and the impurity-related emission remains to be studied. In this work, the synergism between the two kinds of emission in LiCa3ZnV3O12 was explored from these three aspects: lattice distortion, energy transfer and temperature effect. Eu3+ ions replace Ca2+ ions in the lattice of LiCa3ZnV3O12, leading to a lattice contraction of the LCZV host, which depresses the self-activating emission around 500 nm. The characteristic linear emissions of Eu3+ ions are also observed benefiting from the energy transfer from [VO4]3− to Eu3+. Since the temperature quenching effect is more sensitive for the self-activated emission than that for the Eu3+-related ones, the phosphor can be applied as a luminescent temperature sensor, with the absolute and relative temperature sensitivities of 0.012 K−1 and 1.56% K−1, respectively.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
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IF 2.732
Congcong Zhu,Zhangwen Long,Qi Wang,Jianbei Qiu,Junhe Zhou,Dacheng Zhou,Hao Wu,Rui Zhu
Herein, a self-activated phosphor SrCaGa 4 O 8 with excellent thermal stability was synthesized by high temperature solid state reaction method. It exhibited the broad emission range from 300 to 600 nm under 220 nm excitation, which may be caused by the intrinsic defects of host. Specifically, with the temperature increasing, the photoluminescence (PL) color changed from bluish to yellow-green and the maximum of PL intensity at 550 nm was obtained when reaching 493 K. From thermoluminescence curves and high temperature spectra, it was found that the anti-thermal quenching phenomenon could be dependent on the self-compensation of the carriers. Accordingly, the results of temperature-dependent intensity ratio and sensitivity show that SrCaGa 4 O 8 may have potential in the optical temperature sensing.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yaqi Hu,Yanchen Liu,Yang Lu,Zongliang Zhang,Siliang Liu,Fangbo He,Yang Liu,Yongle Chen,Fangyang Liu
All-solid-state lithium metal batteries (ASSLBs) offer an alternative route to safe and high energy density power sources. Sulfur-based cathodes with high theoretical specific capacity and low cost are crucial for advancing ASSLBs. However, the electronic insulation and sluggish kinetics of sulfide materials like Li 2 S severely limit battery performance. Herein, the strategy is proposed that a highly electronic conductive Li 2 S-NbSe 2 material enhances the electrochemical performance through bidirectional self-activation. The chemical interaction between Li 2 S and NbSe 2 induces NbSe 2-x S x and Li 2 Se derivatization, serving as the basis for activation. The carrier transport properties, chemical evolution and self-activation mechanism of Li 2 S-NbSe 2 during the oxidation–reduction process are revealed. The chemical activation of NbSe 2-x S x is explored to accelerate the electrochemical processes by modifying the conductivity of sulfur species and the conversion pathways without insulating Li 2 S and S aggregation. Therefore, ASSLBs using Li 2 S-NbSe 2 as cathode active material achieve an electrode-level energy density of 394 Wh kg −1 and a power density of 524 W kg −1 at 1 C (4.35 mA cm −2 ) and 25 °C. The capacity retention after 100 cycles at 0.5 C is ≈99.3% with almost no degradation. This work provides new options and insights for the rational design and development of chalcogenide cathode active materials for high-performance ASSLBs.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Wenfei Qin,Peng Zhang,Xuan Miao,Yuzhu Yang,Sixia Li,Sai Zhou,Weisheng Liu
Self-activated near-infrared (NIR) phosphors have recently gained extensive attention in special illumination and biomedical applications owing to its non-toxicity, inexpensiveness and especially undoped luminescence center ions. However, high photoluminescence quantum yields (PLQY) and thermal stability remain challenges for NIR-emitting phosphors. In this study, a self-activated phosphor Ca 3 La 2 W 2 O 12 (CLWO) successfully achieved a NIR emission and high thermal stability. Under 350 nm excitation, the optimal CLWO:0.2 %Bi 3+ phosphor shows a narrowband emission in the range of 650–800 nm and a full width of half maximum (FWHM) of 36 nm. Mechanism studies demonstrate that the interstitial oxygen within CLWO host can work as the luminescence center, and enables self-activated emission in NIR waveband. Moreover, CLWO:0.2 %Bi 3+ phosphor shows a high PLQY of 48.84 % and excellent thermal stability (I 420 K /I 300 K = 69.09 %). A NIR phosphor-converted LED (pc-LED) based on a Ca 3 La 2 W 2 O 12 :Bi 3+ (CLWO:Bi 3+ ) phosphor is fabricated on a 350 nm LED chip, demonstrating its potential in NIR night-vision monitoring. This work certainly designs novel insights for outstanding thermal stability of self-activated phosphors and develops new research avenues for self-activated NIR LED light sources applications.
研究领域:
材料科学
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光学
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生物医学工程
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Jiacheng Gong,Wenqin Luo,Weirong Lan,Xi Chen,Haiyan Wu
Sr 3 LiSbO 6 phosphors were prepared by high temperature solid state reaction method. The crystal phase, morphology and optical properties were characterized by X-ray powder diffraction spectroscopy, scanning electronic microscope, absorption and photoluminescence (PL) spectra. The XRD Rietveld refinement was performed to obtain the detailed crystal structure of Sr 3 LiSbO 6 . The electronic structure was analyzed by density functional theory (DFT) calculation. Sr 3 LiSbO 6 possessed indirect band structure and the band-gap were determined to be 3.17 eV. Self-activated far-red emissions at 630–800 nm were detected under the excitation at 340 nm, which was proposed to originate from the transition between interstitial oxygen defective state to six hybrid 4d 10 5s 0 states of Sb 5+ according to the results of PL spectra of samples annealed at different atmospheres. The PL intensity can be significantly enhanced by 2.9 times after doping 2 mol% Gd 3+ ions in Sr 3 LiSbO 6 . The internal quantum efficiency of Sr 3 LiSbO 6 :2 mol%Gd 3+ was determined to be 25.2%. The influence of the Gd 3+ doping on the self-activated PL lifetimes of Sr 3 LiSbO 6 and the thermal quenching property of Sr 3 LiSbO 6 :2 mol%Gd 3+ was studied.
研究领域:
材料科学
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光学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xue Bai,Yujia Han,Baojia Tian,Lu Xu,Xin Jin,Zhiyao Zhang,Pengkang Jin
Photosensitive pollutants, such as dyes, can self-activate peroxymonosulfate (PMS) or persulfate (PS) to degrade themselves under light irradiation, presenting a promising “ waste-as-catalyst ” paradigm in wastewater treatment, which is characterized by low energy consumption and minimal secondary pollution compared with traditional PMS or PS oxidation processes. The findings of this study indicated that trace metal ions, particularly Fe 3 + , significantly enhanced the dye self-activating PS process. To investigate the underlying mechanisms, a visible-light catalytic system comprised by Fe 3+ , Rhodamine B (RhB) and PS was developed. 10 μM Fe 3+ facilitated the complete degradation of 100 mL 10 mg/L of RhB within an hour. The efficiencies for total organic carbon removal and 1 mM PS decomposition were respectively 52.5 % and 24 %, three and two times higher than those of the RhB/PS system. The formation of Fe-N bond between Fe 3+ and the RhB molecule was responsible for this improvement, which enhanced the light absorption capability of RhB, benefiting for more photoinduced electrons generation and fast transmission. Some of the electrons were directly transferred to PS, while the remainder were captured by Fe 3+ , subsequently reduced to Fe 2+ . Both pathways initiated the efficient decomposition of PS. The resulting oxidizing species of •OH, SO 4 •− , O 2 •− and 1 O 2 attacked the RhB molecules with varying degrees of contribution, which ultimately led to N-deethylation, chromophore cleavage, ring-opening and finally mineralization. This study presents a method that fully leverages the trace metal ions in wastewater to substantially enhance the performance of the “ using waste to treat waste ” water purification system.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 46
·2207881
·
IF 19.924
Jingna Jia,Xuwen Gao,Guizheng Zou
The self-activated mechanoluminescence (ML) of oxysulfides MZnOS (M = Ca, Sr, Ba) is very weak, and bright ML from these hosts is usually achieved with activator-doping strategy. Herein, a promising alkaline-earth-metal-ion blending strategy, instead of activator doping, is proposed to achieve intense and self-activated ML from MZnOS. Upon partially substituting the Ca 2+ of CaZnOS with Ba 2+ and vice versa, intense and eye-visible ML is achieved via exerting a small mechanical stimulus of 2 N onto the obtained Ca 1-x Ba x ZnOS (0 < x < 1). The luminescence center for ML of Ca 1-x Ba x ZnOS is intrinsic oxygen vacancy, so that Ca 1-x Ba x ZnOS can give off efficient and self-activated ML. Under optimum conditions, the maximum ML emission of Ca 0.84 Ba 0.16 ZnOS is about 50-folds and 170-folds to that of CaZnOS and BaZnOS, respectively. Promisingly, Bi 3+ can be incorporated into the lattice of Ca 1-x Ba x ZnOS, transferring ML center from the oxygen defects of Ca 1-x Ba x ZnOS to the activator of Ca 0.96-x Ba x ZnOS:Bi 0.04 , and eventually enable further enhanced ML by about twofolds. This alkaline-earth-metal-ion blending strategy can also enhance Bi 3+ -activated ML from M 0.96 ZnOS:Bi 0.04 , the maximum emission for ML of Ca 0.80 Ba 0.16 ZnOS:Bi 0.04 is 36-folds and 38 folds to that of Ca 0.96 ZnOS:Bi 0.04 and Ba 0.96 ZnOS:Bi 0.04 , respectively. This work opens an avenue to develop new ML hosts and luminophores with efficient emission.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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