CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Xu Lin,Danyang Li,Shiqing Huang,Panpan Sun,Yan Huang,Shitao Wang,Lirong Zheng,Dapeng Cao
The limited activity of atomically-dispersed M-N-C electrocatalysts severely restricts their applicability in the oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFC). Herein, we design and synthesize Se-doped Fe-N-C hierarchical porous electrocatalyst (FeN 4 /SeC 2 ) by optimizing carbon structure and FeN 4 coordination environment. The FeN 4 /SeC 2 electrocatalyst exhibits outstanding ORR activity in 0.1 mol L –1 HClO 4 , and the resulting PEMFC presents a peak power density of 1.20 W cm –2 in H 2 -O 2 condition at a back pressure of 200 kPa, ranking in the top levels among most reported non-precious metal catalyst-based fuel cells. The lower O 2 transfer resistance of FeN 4 /SeC 2 -based membrane electrode assembly than FeN 4 -based one means faster O 2 transport in triple-phase boundary (TPB), and Density functional theory calculation further reveals that the synergistic catalysis between porous SeC 2 and FeN 4 -OH species can efficiently lower the energy barriers for the rate-determining step of the ORR. In short, the outstanding performance of FeN 4 /SeC 2 in PEMFC is ascribed to the Se-doping, which introduces more defects and larger mesoporosity and therefore facilitates ionomer infiltration and O 2 transfer and charge transfer in TPB. The effective strategy of enhancing mass and charge transfers in TPB is anticipated to be applicable in the construction of highly efficient ORR electrocatalysts.
研究领域:
电催化
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能源材料
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纳米材料
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物理化学
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燃料电池
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表面科学
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计算化学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Dandan Li,Wenrong Zhao,Gang Li,Yan Xu,Liang Xu,Bo Tang
Graphical Two novel star-shaped fluorophores named PDI−S and PDI−Se are constructed by S/Se-fused perylene diimides (PDIs) connected with bicarbazole core. Particularly, PDI−S presents excellent two-photon absorption cross-action (δ TPA ) of 3775 GM excited with 800 nm light, which is the highest value based on PDIs motif in the NIR−I region (700–900 nm). Two-photon absorption (TPA) has attracted growing attention over recent years owing to the wide range of applications in organic nonlinear optical (NLO) materials. The quantitative sensitivity of a two-photon molecular entity is determined by its TPA cross-section (δ TPA ). Perylene diimides (PDIs) are excellent n-type organic semiconductor materials demonstrating distinguished thermal, optical, and chemical stability. Nonetheless, PDIs-based scaffolds exhibit poor δ TPA in the NIR−I region (700–900 nm) due to the lack of suitable molecular design. Here, two novel star-shaped PDIs fluorophores, namely PDI−S and PDI−Se, were constructed by four periphery S/Se-fused PDIs connected with bicarbazole core. PDI−S manifested excellent δ TPA of 3775 GM, which are among the highest values reported for PDIs excited in the NIR−I region.
研究领域:
有机化学
·
材料科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 17
·10260-10268
·
IF 10.7
Yingfen Li,Xingye Chen,Runxi Wang,Nian Zhou,Fang Huang,Jun Zhao,Zhenghua Su,Shuo Chen,Guangxing Liang
In this study, Sb2S3 was introduced into the two-step selenization process to promote bottom grain growth and reduce the surface roughness of the Cu2ZnSn(S,Se)4 light-absorber layer. The introduction of Sb doping in Cu2ZnSn(S,Se)4 can passivate bulk and interface defects and a small conduction band offset (CBO) can be found, which facilitate the improvement of heterojunction carrier transport properties. Similarly, simulations illustrated that Sb doping improved device efficiency by controlling bulk and interface defects and band alignment. This optimized method facilitated the penetration of Sb, resulting in a high-quality CZTSSe absorber layer. Ultimately, the research culminated in a significant enhancement, yielding a solar cell with an impressive efficiency of 13.11%. These findings offer new possibilities for kesterite solar cells and advance the potential of CZTSSe materials in thin film photovoltaic applications.
研究领域:
材料科学
·
光伏技术
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半导体物理
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薄膜太阳能电池
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无机功能材料
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固态电子学
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DOI
高影响因子
Journal of the American Chemical Society
·
2019
·
IF 14.695
Ruijin Sun,Shifeng Jin,Lin Gu,Qinghua Zhang,Qingzhen Huang,Tianping Ying,YiRan Peng,Jun Deng,Zhiping Yin,Xiaolong Chen
The pairing of ions of opposite charge is a central principle of chemistry. Even though the ability to intercalate anions is desirable for many applications, it remains a key challenge for numerous host materials with their outmost layers beingn anions. In this work, we introduce a hydrothermal ion-exchange synthesis to intercalate oxidative S and Se anions between the Se layers of FeSe, which leads to single crystals of novel compounds (Se/S)x(NH3)yFe2Se2. In particular, the unusual anion–anion bonding between the intercalated S (or Se) and Se layers exhibits strong ionic characteristics. The charge transfer through the Se layer to S (or Se) intercalants is further confirmed by the elevated oxidation state of Fe ions and the dominant hole carriers in the intercalated compounds. By intercalating S, for the first time superconductivity emerged in hole-doped iron chalcogenides. The generality of this chemical approach was further demonstrated with layered FeS and NiSe. Our findings thus open an avenue to exploring diverse aspects of anionic intercalation in similar materials.
研究领域:
材料化学
·
超导物理
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无机化学
·
固态化学
·
凝聚态物理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Zhen Wan,Qian Wu,Tian Deng
Periodontitis is a chronic inflammatory disease initiated by bacterial pathogens, resulting from complex interactions between microbial infection and host immune responses. In current clinical practice, antibiotics represent the most frequently utilized adjunctive therapy for periodontitis. However, the overuse of antibiotics not only contributes to the emergence of bacterial resistance but also demonstrates limited efficacy in inflammation resolution. In this study, we synthesized selenium/Ti 3 C 2 (Se/Ti 3 C 2 ) through a one-step redox method using Ti 3 C 2 as a template. The Se/Ti 3 C 2 demonstrated significant antibacterial activity against Escherichia coli ( E.coli ), Staphylococcus aureus ( S.aureus ), and Porphyromonas gingivalis ( P.gingivalis ) under near-infrared (NIR) light irradiation, as evidenced by comprehensive evaluations including colony-forming unit (CFU) counting assays, live-dead fluorescence staining, scanning electronic microscopy (SEM) observations, growth curves, and membrane potential staining assays. Furthermore, the anti-inflammatory and antioxidant properties of Se/Ti 3 C 2 were investigated using various methodologies, including 1,1-diphenyl-2-pyridine-hydratedacyl (DPPH) scavenging assay, 2,2′-azino-bis(3-ethylbenzothiazoline)-6-sulphonic acid (ABTS) scavenging assay, glutathione peroxidase (GPX) activity measurement, intracellular reactive oxygen species (ROS) fluorescence staining, flow cytometry, and quantitative real-time polymerase chain reaction (qPCR) assays. Through GPX1 gene knockdown experiments, we demonstrated that the anti-inflammatory effects of Se/Ti 3 C 2 were closely associated with GPX1 expression. RNA sequencing analysis was subsequently performed to elucidate the underlying mechanisms of its anti-inflammatory and antioxidant activities. Finally, in vivo experiments using a mouse periodontitis model demonstrated the remarkable therapeutic potential of Se/Ti 3 C 2 in periodontitis treatment. Therefore, Se/Ti 3 C 2 holds great promise as a potential alternative to antibiotics, emerging as a novel therapeutic material for periodontitis treatment.
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Di Wu,Wen Ren,Yang Yang,Jiulin Wang,Yanna NuLi
A magnesium–sulfur (Mg–S) battery system is considered a high-performance candidate for next-generation secondary batteries, because of its prominent advantages such as high safety, low cost, and high energy density. However, the shuttle effect caused by the dissolution of polysulfides leads to irreversible loss of capacity. Herein, we prepare a S0.96Se0.04@CMK3 composite (with a high S + Se content of 82.6 wt %) and employ the composite material as a cathode for Mg batteries with easily prepared hybrid electrolytes. The electronic conductivity of the cathode material increases by 18 orders of magnitude after Se doping, from 5 × 10–28 to 6.5 × 10–10 S m–1. Compared with S@CMK3, doped Se in S0.96Se0.04@CMK3 plays an important role in maintaining capacity stability by lowering polarization, facilitating electron transport, and improving reaction kinetics. The S0.96Se0.04@CMK3 cathode delivers a stable and reversible capacity of 492.9 mAh g–1 after 110 cycles, which is almost twice that of the S@CMK cathode without Se doping, and better rate performance. This Se-doping strategy proposes an effective method to exploit high-performance cathodes for Mg–S batteries.
研究领域:
电化学
·
能源材料
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无机化学
·
纳米材料
·
二次电池
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DOI
高影响因子
RARE METALS
·
2026
·Vol. 45
·期 5
·e70343
·
IF 12.1
Yanan Fu,Qi Xia,Huiling Cai,Xiang Li,Fangyu Gao,Xiang Han,Qin Peng,Huixin Chen,Hongjun Yue
en This link goes to a English section zh This link goes to a Chinese section Lithium-selenium (Li-Se) batteries have attracted considerable attention due to their high theoretical specific capacity and the intrinsically good electronic conductivity of selenium. Nevertheless, low active-material utilization, parasitic side reactions, and sluggish reaction kinetics hinder their practical application. Here, we propose a synergistic bulk-interfacial-engineering strategy that integrates an iodine-doping hollow carbon host (HNC@I) with a 5 vol% fluoroethylene carbonate (FEC) electrolyte additive for advanced Li-Se batteries. Structural and chemical analyses using TOF-SIMS (time-of-flight secondary ion mass spectrometry) and HRTEM (high-resolution transmission electron microscopy) confirm the presence of a compact, electrochemically stable, and mechanically robust LiF/LiI-rich cathode electrolyte interphase (CEI) layer, which prevents electrode cracking and enhances cycling stability. Iodine doping facilitates the Se ↔ Li 2 Se n ↔ Li 2 Se conversion kinetics, thus enhancing rate performance and mitigating electrode cracking. Benefiting from these synergistic effects, the HNC/Se@I | + 5 vol% FEC electrode delivers a reversible capacity of 580.6 mAh g −1 after 200 cycles at 0.2C and retains 503.3 mAh g −1 after 500 cycles at 1C. In addition, it achieves 677.6, 658.0, 641.0, 629.1, 564.6, and 449.3 mAh g −1 at 0.1C–5C, respectively, demonstrating excellent rate capability. This study provides new insights into interfacial optimization strategies for Li-Se batteries. 摘要 en This link goes to a English section zh This link goes to a Chinese section 锂-硒(Li-Se)电池因其高理论比容量以及硒本征优良的电子导电性而备受关注。然而,活性物质利用率低、副反应严重以及反应动力学迟缓等问题仍然阻碍其实际应用。在本工作中,我们提出了一种体相–界面协同工程策略,将碘掺杂空心碳载体(HNC@I)与体积分数为 5 vol% 的 FEC(氟代乙烯碳酸酯)电解液添加剂相结合,用于构筑高性能 Li-Se 电池。基于TOF-SIMS(飞行时间二次离子质谱)和HRTEM(高分辨透射电子显微镜)的结构与化学分析结果证实,电极表面形成了致密、电化学稳定且力学稳健的富LiF/LiI固体电解质界面(CEI)层,从而有效抑制电极开裂并提升循环稳定性。碘掺杂加速了Se↔Li 2 Se n ↔Li 2 Se的转化反应动力学,进而改善倍率性能并缓解电极开裂。得益于上述协同效应,HNC/Se@I | + 5 vol% FEC 电极在0.2C电流密度下循环200圈后仍能提供580.6 mAh g −1 的可逆比容量,并在1C下循环500圈后保持503.3 mAh g −1 的容量。此外,该电极在0.1C、0.2C、0.5C、1C、2C和5C倍率下分别实现了677.6、658.0、641.0、629.1、564.6和449.3 mAh g −1 的比容量,表现出优异的倍率性能,本研究为Li-Se电池的界面优化策略提供了新的见解与思路。
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Li Zhang,Youwen Li,Yuying Feng,Jiahui Jiang,Ting Zhao,Guancheng Xu
A trimetallic selenide electrocatalyst (Co, Fe, Ni)Se2 supported on nickel foam (NF) has been successfully synthesized for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The catalyst was fabricated through a two-step strategy involving the formation of metal-organic frameworks (MOFs) precursors followed by a selenization reaction. The optimized (Co, Fe, Ni)Se2/NF-3:1 exhibited remarkable OER activity with an overpotential as low as 170 mV to achieve 10 mA cm-2, along with excellent stability over 1000 cycles. Its superior UOR performance with even lower overpotential further demonstrates promise for urea-assisted energy-saving hydrogen production. The enhanced electrocatalytic performance originates from the synergistic electronic modulation between Co, Fe, and Ni, the rough surface morphology facilitating mass and charge transport, and the highly conductive NF substrate enabling efficient exposure of active sites. This work provides valuable insights into the design of efficient multimetallic selenide electrocatalysts for sustainable electrochemical energy conversion.
研究领域:
电化学
·
能源材料
·
催化
·
可持续能源
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Nanomaterials
·
2021
·
IF 2.986
Qilin Pan,Miaomiao Li,Mucang Xiao,Yulu He,Guangyu Sun,Ting Xue,Youhuan Luo,Li Chen,Baoquan Ai,Jianwen Xiong
Titanium dioxide nanoparticles (TiO2-NPs) are highly efficient photosensitizers in traditional photodynamic therapy (PDT). The particle size of TiO2-NPs is small, only about 20 nm. However, the demands of ultraviolet light (UV) excitation feature shallow tissue penetration depth and may lead to severe tissue photon damage. Thus, in this research, TiO2-NPs are modified with semiconductor quantum dots (QDs) CdX (X = S, Te, Se) in various methods, such as ultrasonic, hydrothermal, sol-gel, aqueous phase, and hydrolysis precipitation. The transmission electron microscopy (TEM) images show that the size of CdSe-TiO2 is ranging from 6 to 14 nm. The ultraviolet-visible (UV-Vis) spectrum demonstrates that the CdX (X = S, Te, Se) modification can successfully extend the absorption range of TiO2-NPs into a different visible light region. CdSe QDs have the narrowest band gap compared with CdX (X = S, Te, Se) QDs. Visible light-activated CdSe-TiO2 nanocomposite shows the highest PDT inactivation efficiency toward HL60 cells compared with CdX-TiO2. The photogenerated carrier separation efficiency of CdSe-TiO2 nanocomposite is the highest shown in a fluorescence spectrum (FS). Furthermore, when conjugated with folic acid (FA), the prepared FA-CdX-TiO2 (X = S, Se) exhibits excellent cancer-targeting ability during PDT treatment. Optimum PDT efficiency of FA-CdSe-TiO2 indicates that photocatalytic and targeting ability is much higher than pure TiO2 and CdSe-TiO2. Our results provided a detailed investigation on the PDT performance of CdX (X = S, Te, Se) modified TiO2 and may act as a guide for further design of highly targeted performance visible-light response TiO2-NPs.
研究领域:
纳米技术
·
癌症研究
·
材料科学
·
生物医学工程
·
化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Ruopeng Li,Qingyang Li,Lihui Xiao,Xinxin Bai,Shanshan Ji,Jinqiu Zhang,Maozhong An,Peixia Yang
Zinc–air batteries are regarded as ideal candidates for next-generation energy conversion and storage devices, but their conversion efficiency is mainly limited by the sluggish kinetics of the oxygen evolution reaction (OER). Therefore, development of highly active and durable non-noble-metal OER catalysts is of great significance to promote their industrialization process. Herein, we electrodeposit amorphous CoSe 2 ultrathin nanosheet arrays which exhibit a low overpotential of ∼0.287 V at 10 mA/cm 2 and a Tafel slope of ∼62 mV/dec toward the OER in 1 M KOH. This catalytic activity is superior to their crystalline counterpart, commercial RuO 2 , and most of the reported Co-based catalysts. It can be mainly attributed to the lowered adsorption free energy of OER intermediates and improved charge transfer ability with a phase transformation from the crystalline state to the amorphous state, besides the intrinsic catalytic activity of CoSe 2 . When serving as an air cathode in a zinc–air battery, the amorphous CoSe 2 also realizes a larger power density and a better long-term cyclability compared with those of crystalline CoSe 2 and Pt/C–RuO 2 electrodes. This work offers a new underpotential deposition strategy to fabricate high-activity amorphous catalysts and demonstrates its great potential for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 31
·2201086
·
IF 6.389
Zhixuan Yuan,Zilong Li,Zewei Chen,Weilong Xu,Junmin Zhu,Xiulan Li,Jinchang Xu,Yujie Peng,Yanshuo Jin,Nan Wang,Xiang Yu,Hui Meng
Hydrogen production from overall water splitting assisted by organic oxidation reforming reaction is an innovative method to improve the anode behavior. Utilizing transition metal chalcogenides where the electronic states are regulated by anion modification, hexagonal Se-NiS x pine-needle-like nanowires are prepared via a simple one-pot hydrothermal reaction without any post-processing steps. The nanowires can serve as ethanol electrooxidation reaction (EOR) catalyst with outstanding electrocatalytic activity ( j 100 = 1.36 V) and long-term durability. In the practical tests of the hybrid water splitting, the catalyst required only 1.50 V to obtain 50 mA cm −2 , and worked stably for over 50 h at a high current density of 200 mA cm −2 accompanied by an excellent selectivity ( F E = 98.0%). These demonstrate that the introduction of Se significantly improves the catalytic performance of transition-metal chalcogenides for EOR, indicating a new avenue for the design and improvement of other electrocatalysts.
研究领域:
电化学
·
能源材料
·
催化
·
纳米材料
·
氢能
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junjie Fu,Afei Zhang,Dongxing Kou,Zewen Xiao,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
One important issue limiting the development of Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is the severe recombination loss at CZTSSe/Mo(S,Se) 2 /Mo back contact, primarily arising from the non-matched potential barrier and inferior electric contact between absorber and weak n -type Mo(S,Se) 2 interfacial layer. It is expected that a p-type Mo(S,Se) 2 can effectively improve the hole extraction and enhance the device performance. In this work, we propose a plausible direction to build up an electrically benign back surface field by in-situ doping Mo(S,Se) 2 with group VB elements (TM = V, Nb and Ta). It is turned out that the generated V Mo , Nb Mo , or Ta Mo shallow acceptors could convert Mo(S,Se) 2 from weak n -type to p-type conductivity and increase its work function ( W F ) and hole concentration. With the contact of p-type absorber ( W F,absorber < W F,Mo(S,Se)₂ ), a benign ohmic contact with favorable downward band bending is formed, thereby accelerating the holes extraction and minimizing interface recombination loss. With significant gains in open-circuit voltage ( V oc ) and fill factor (FF), the Mo(S,Se) 2 :Ta device finally increases the efficiency from 10.82 % to 12.72 %. This convenient in-situ Mo(S,Se) 2 doping strategy is different from previous complicated or unstable cases and should serve as a basis for high-quality back contact engineering in kesterite photovoltaics.
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产品关联
DOI
高影响因子
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