PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
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IF 5.3
Nan Liu,Qi Chen,Xianwu Jiang,Jie Chen,Lidong Zhang,Jiaying Pan,Haiqiao Wei,Xingqian Mao
This work presents a three-stage hybrid nanosecond discharge (NSD) and direct current (DC) discharge assisted n -C 5 H 12 /O 2 /N 2 ignition with lower discharge energy and higher energy efficiency. The reaction rate coefficients between O 2 (a 1 Δ g ) and n -C 5 H 12 are updated by mass/Master equation simulation. The promotive ignition enhancement via reaction channel O 2 (a 1 Δ g ) + n -C 5 H 12 → C 5 H 10 + H 2 O 2 in the hybrid NSD/DC discharge is demonstrated. The results show that the ignition delay time of the three-stage hybrid plasma assisted ignition is 1–2 orders of magnitude shorter than that of the two-stage hybrid discharge when the reduced electric field strength in the DC discharge stage is over 10 Td. Meanwhile, the plasma-enhanced energy efficiency of three-stage hybrid discharge increases. This improved efficiency on ignition enhancement is due to the kinetic enhancement by the electronically excited species and radicals (O 2 (a 1 Δ g ), O( 1 D), N 2 (B) and O). The kinetic and thermal effects by plasma are effectively intergated to enhance ignition. However, more discharge energy deposited in the vibrationally excited states N 2 ( v ) in the two-stage hybrid discharge is less efficient on ignition enhancement due to the thermal contribution via vibrational-translational relaxation. In the aspect of NO x /N 2 O emissions, reduction efficiency of the three-stage hybrid discharge is two times higher than that of the two-stage hybrid discharge. By controlling the N/N( 2 D) production pathway e + N 2 → e + N + N( 2 D), the three-stage hybrid discharge reduces NO x and N 2 O production by 61.1 % and 90 %, respectively. The results show that the ignition delay time is non-monotonically dependent on the discharge pulse number. There exist optimal pulse number, reduced electric field and effective threshold power density of DC discharge to achieve maximum ignition enhancement and low NO x /N 2 O emissions. This study provides valuable insights into the use of NSD/DC hybrid discharge technology in advanced engines to achieve energy-efficient ignition enhancement and reduce NO x /N 2 O emissions.
研究领域:
能源科学
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环境科学
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化学动力学
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产品关联
DOI
高影响因子
Advanced Science
·
2026
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IF 14.1
Zesheng Chen,Yanchao Yu,Xingyuan Xiao,Wenwen Cheng,Ye Yang,Zhengyao Zhang,Wang Wang,Zhijun Zhou,Weikang Hu,Xiaolong Wang,Bing Li,Kwang Leong Choy,Yun Chen,Zijian Wang
Impaired wound healing in diabetes is closely associated with cellular ferroptosis. Microneedle-assisted gas therapy exerts molecular regulation of ferroptosis, representing a promising approach for accelerating diabetic wound healing. To date, O 2 and H 2 gas therapies have consistently been conducted independently and have never been integrated into a single system. Whether and how their synergy might be realized remains a defining challenge. Herein, we propose a concept of integrated O 2 and H 2 gas therapy, demonstrated by fabricating a gas-producing microneedle material. Platinum@MIL-101(Fe)-NH 2 @phosphotungstic acid (PMP) nanoparticles are synthesized as a visible light-driven photocatalyst for H 2 and O 2 co-evolution. The rational design of a spatially separated structure boosts their photocatalytic efficiency under physiological conditions. PMP nanoparticles are further incorporated with bilayer gelatin methacryloyl (GelMA)/PMP composite microneedles (denoted as GPM microneedles). The obtained GPM microneedles enable transdermal delivery of PMP nanoparticles for integrated O 2 and H 2 gas therapy, and demonstrate desirable biocompatibility and pro-regenerative effects. The mechanism of integrated O 2 and H 2 gas therapy has been identified as a TNFAIP3/hnRNPA1 ubiquitination/ferroptosis signaling axis, establishing for the first time a direct link to ferroptosis. In conclusion, this study yields a transformative concept and a ferroptosis-targeting microneedle material with well-defined molecular mechanism for diabetic wound management.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Shan Jiang,Jing Cao,Minna Guo,Dongdong Cao,Xuemei Jia,Haili Lin,Shifu Chen
Elemental red phosphorus (RP) has an ultra-low activity of splitting water for H 2 and O 2 evolution. In this study, RP was decorated by trace amount of WO 3 to greatly enhance the photocarriers separation and photocatalytic activity for overall water splitting under visible light. The 2.5% WO 3 /RP composite achieved the highest activity to produce H 2 and O 2 , and the activity was 7.0 times that of pure RP under visible light (λ ≥ 420 nm). The significantly increased photocarriers separation of WO 3 /RP was ensured by transient photocurrent, electrochemical impendence, photoluminescence, and time-resolved photoluminescence characterizations. More importantly, WO 3 /RP maintained high stability when it was persistently used for 20 cycles. Based on the reactive oxygen species ( O 2 − and OH) detected during the photocatalytic process, an S-scheme mechanism was proposed for WO 3 /RP composites to efficiently separate the photocarriers. This work provides a notion for improving the overall water splitting activity of RP via an S-scheme photocarriers separation mode.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
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IF 11.3
Jingwen Qian,Mingyi Yu,Zheng Lian,Shule Zhang,Qin Zhong
An innovative strategy in wet flue gas denitration technology was proposed to control nitrogen oxide emissions from cement kiln. Here the use of tetrabutylammonium bromide (TBAB) as an additive improved the absorption and utilization efficiency of sulfite absorbents for NO2. Compared with the sulfite solution, the stability time and absorption efficiency of adding TBAB were increased from 25 to 76 min and from 91.2 to 98.4%, respectively. Continuous absorption for 480 min indicated the feasibility of TBAB for repeated use. Moreover, we propose an antioxidant mechanism, including the capture of SO3•– by TBA+, and the reduction of SO3•– by Br–. The successive steps kept the sulfite from the cyclic depletion of the radical chain reaction of “Generate SO3•–-Introducing O2–Consuming SO32–” due to O2. A new application of TBAB in free radical trapping and antioxidant is given. Furthermore, a kinetic model describing the macroscopic absorption rate was developed based on different operating conditions.
研究领域:
环境化学
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化学工程
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物理化学
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大气污染控制
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工业生态学
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产品关联
DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2025
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IF 13.5
Yanyan Zhao,Zhen Wu,Yong Zhang,Bicheng Zhu,Jianjun Zhang
Photocatalytic oxygen reduction reaction (ORR) offers a mild and cost-effective approach for hydrogen peroxide (H 2 O 2 ) production. However, its practical application is significantly hindered by rapid charge carrier recombination and insufficient O 2 adsorption capacity in photocatalysts. To address these limitations, we developed a strategy involving the creation of S-vacancy-rich CdIn 2 S 4 (S v –CIS) to facilitate charge separation and subsequent deposition of Au nanoparticles on its surface (Au–S v –CIS) to strengthen O 2 adsorption. The results suggest that the optimized Au–S v –CIS achieves a significantly increased H 2 O 2 production yield of 2542 μmol·h·g −1 in 10%-ethanol/water solution, which is about 12.8 and 1.7 times higher than that of pure CIS and S v –CIS. Comprehensive characterizations including photoluminescence spectra, time-resolved photoluminescence spectra, transient photocurrent response, electrochemical impedance spectra, and femtosecond transient absorption spectroscopy confirm the improved charge dynamics of Au–S v –CIS. In addition, temperature-programmed desorption of O 2 combined with density functional theory calculations conclusively demonstrates the superior O 2 adsorption capacity of Au–S v –CIS. This work provides a design strategy for efficient solar–to–chemical energy conversion through cooperative photocatalyst engineering.
研究领域:
光催化
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纳米材料
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能量转换
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2025
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IF 14.1
Zhengcai Zhang,Dulin Huang,Xiaohui Peng,Zhang Zhang,Yaying Dou,Zhen Zhou
Redox mediators (RMs) represent the most promising strategy to address the sluggish kinetics of lithium–oxygen (Li–O 2 ) batteries. To achieve high-energy and cost-effective Li–O 2 batteries, carbon materials are typically regarded as ideal cathodes in these systems. However, the impact of their surface properties—which often regulate specific discharge pathways—on the RM-mediated oxygen reduction reaction (ORR) remains unclear. In this study, CNTs electrodes with different surface properties are fabricated. Results suggest that CNTs with more surface defects not only promote the unmediated discharge pathway even in RMs-involved battery systems but also exacerbate the corrosion of carbon cathodes. This, in turn, leads to the undesired accumulation of Li 2 O 2 and Li 2 CO 3 on the cathode surface, which hinders effective and continuous electron transfer between the cathode and RMs, ultimately decreasing the catalytic activity of RMs. As a result, the discharge capacity of the battery is seriously diminished, especially at large current densities. These findings underscore the significance of surface engineering in advancing the performance of RMs-assisted Li–O 2 batteries.
研究领域:
电化学
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材料科学
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储能技术
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表面工程
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Materials Science
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2025
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IF 17.9
Hongjing Liu,Shan Ren,Xiaodi Li,Liang Wang,Bofeng Bai,Shouning Chai,Peng Chen,Fan Dong
Photocatalytic oxidation of nitrogen oxides (NO x ) is a promising technology for environmental protection and green sustainable development. However, its practical application remains limited due to inefficient activation of NO and O 2 , stemming from inadequate structural design of photocatalysts. Herein, we developed a thin-layer two-dimensional (2D) material Bi 2 MoO 6 (BMO) via cetyl trimethyl ammonium chloride (CTAC) addition in synthesis process, which effectively modulates the surface electronic structure, enhance the light absorption and activation of NO and O 2 . This thin-layer Bi 2 MoO 6 nanosheets achieved a NO oxidation efficiency of 45.3 %, which was about 5.5 times that of traditional bulk BMO (8.2 %). Additionally, it demonstrated superior selectivity for NO 2 − /NO 3 − production (86.6 %) compared to bulk BMO (60.5 %) and significantly reduced the formation of toxic NO 2 byproducts (13.4 % vs. 39.5 %). Combining experimental characterizations and density functional theory (DFT) simulations, it demonstrated that the electron-hole pair separation could be promoted and targeted adsorption activation of O 2 can be enhanced to form superoxide radicals (•O 2 − ) and singlet oxygen ( 1 O 2 ) via the effect of surface charge transfer adjustment on the thin-layer structure of Bi 2 MoO 6 , which are key factors affecting the efficiency and selectivity of photocatalytic oxidation of NO. This work provides important insights into the formation of directed ROS and proposes a unique mechanism for selective NO oxidation.
研究领域:
环境科学
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材料科学
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光催化
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化学工程
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理论化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Yixi Wang,Wenqing Xu,Zhi Liu,Yulong Shan,Wanrong Chen,Xinyu Zhang,Tingyu Zhu
Controlling both CO and NOx pollutants without additional cost is necessary but challenging, especially in industrial flue gas with complex components. Previous studies mainly focused on the effect of O 2 and SO 2 on the CO oxidation side reaction and valence state of Ir species on various catalysts, while neglecting the impact on NO conversion pathway. Herein, we propose an "ineffective reaction pathway" in the presence of O 2 with nitrate as an intermediate according to the results of in situ DRIFTS and DFT. And we also reveal the contribution of SO 2 in inhibiting the adsorption of O 2 and promoting the selective adsorption of NO and CO even at lower injection concentrations, based on the oxidation of SO 2 on Ir(111). This is quite a favorable characteristic for the treatment of industrial flue gas, resolving the long–standing dispute on the involvement of these components in the CO–SCR reaction. Under specific conditions (CO/NO=20, O 2 =5%, SO 2 =200 ppm) at 250 °C, the NOx conversion is as high as 78%. These results will contribute to the development of more efficient catalysts in the future for simultaneously controlling two pollutants (CO and NOx).
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yingnan Zhu,Jiahang Si,Tiantian Xu,Lan Zheng,Xinyu Xiao,Xiaohan Sun,He Ding,Yuze Dong
Chemodynamic therapy (CDT) and photodynamic therapy (PDT) have emerged as promising strategies for treating skin abscesses. However, their therapeutic efficacy is fundamentally constrained by the hypoxic and hydrogen peroxide-deficient microenvironment characteristic of abscesses. Herein, we developed a near-infrared (NIR) light-responsive nanoplatform (ICG/CuO2@PCM) by encapsulating copper peroxide (CuO2) and indocyanine green (ICG) within a phase-change material (PCM), which enables control over self-supplied H2O2/O2 release via an NIR-triggered cascade. Upon irradiation, ICG-mediated photothermal conversion elevates the temperature beyond the PCM melting threshold, triggering a burst release of CuO2 and ICG. CuO2 generates hydroxyl radicals (•OH) through a Fenton-like reaction in the acidic wound microenvironment. Additionally, CuO2 can thermally decompose under photothermal conditions to produce a sustained oxygen supply, which ICG immediately converts into singlet oxygen (1O2), thereby enhancing PDT efficiency. Furthermore, photothermal therapy not only enhances the efficiency of CDT but also provides additional antibacterial support. Remarkably, ICG/CuO2@PCM (NPs), coupled with irradiation, accelerate abscess wound recovery by dispersing biofilm, killing bacteria, and promoting macrophage polarization toward an anti-inflammatory phenotype. Overall, this NIR-responsive nanoplatform highlights the promise in controlled modulation of microenvironment-adaptive antimicrobial strategies to overcome current limitations of hypoxic infections.
研究领域:
生物医学工程
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纳米医学
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感染性疾病治疗
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抗菌治疗
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转化医学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Cailiang Yue,Yukun Tian,Linlin Zhu,Nan Sun,Zhiqi Zhou,Fuqiang Liu,Yifei Sun
Photocatalytic 1 O 2 generation has emerged as a promising technology for environmental remediation and organics synthesis. Nevertheless, the efficiency of photocatalytic 1 O 2 generation via O 2 activation through charge-transfer mechanism remains challenging in carbon nitride due to the weak dielectric screening effect. Herein, series of uric acid (UA)-modified ultrathin carbon nitride nanosheets (UCN-x) were fabricated by the simple supramolecular self-assembly process. Comprehensive characterizations revealed that the incorporation of UA pigment would induce purine structure into heptazine skeleton. Photocatalytic experiments showed that the modification of UA greatly enhanced photocatalytic 1 O 2 generation ability. The optimal UCN-2 exhibited superior photocatalytic degradation of tetracycline (TC) with the normalized TC degradation rate up to 10.03 mg TC g cat −1 min −1 , which was 2.1–31.1 times as high as that of reported photocatalysts. What's more, UCN-2 exhibited excellent photocatalytic TC degradation across diverse aqueous conditions, demonstrating significant potential in environmental remediation. Time-dependent density functional theory (TD-DFT) calculation revealed that the doping of UA could trigger the spatial separation of h + /e − distribution, with h + concentrated in UA pigment and e − concentrated in adjacent heptazine ring. The engineered adjacent redox sites were precisely tailored to align with the charge-transfer mechanism for photocatalytic 1 O 2 generation. This work established a fundamental framework for designing highly efficient photocatalysts with manipulated O 2 activation.
研究领域:
环境科学
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材料化学
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光催化
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纳米材料
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环境修复
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2025
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IF 21.1
Ergui Luo,Jingyi Liang,Kexuan Zhang,Xian Wang,Luozhen Jiang,Tianjun Hu,Junming Zhang,Junjie Ge,Jianfeng Jia
Electrochemical two-electron oxygen reduction reaction (2e − ORR) serves as an appealing approach for green hydrogen peroxide (H 2 O 2 ) production. However, the corresponding progress in efficient non-precious metal catalysts for acidic 2e − ORR has not kept pace, with the research model being almost confined to Co-based system. Here, guided by molecular dynamics simulations, the active nature and origin of pyrolyzed Cr−N 4 catalysts for ORR are unveiled, wherein the over-strong oxygen affinity of the Cr center is counterbalanced by a spontaneous axial O-coordination. By creating an oxidation-induced electron-deficient environment, the Cr−N 4 can be flexibly tailored for selective H 2 O 2 formation. A single-atom Cr−N 4 /C(O) catalyst is developed experimentally, which rivals and even slightly outperforms its Co-based counterpart in terms of selectivity (92% versus 71%) and productivity (202 versus 145 mmol g cat −1 h −1 ) for H 2 O 2 . More encouragingly, the Cr-based catalysts exhibit minimal reactivity towards H 2 O 2 -related side reactions, with the metal component being robust against leaching. This research marks the first identification of pyrolyzed Cr−N 4 catalysts as competent for acidic two-electron O 2 reduction to H 2 O 2 . The innovative models and insights offer profound guidance for the design of future-generation catalysts for electrochemical H 2 O 2 synthesis.
研究领域:
电催化
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材料科学
·
能源化学
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可持续化学
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计算化学
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产品关联
DOI
PubMed
高影响因子
Joule
·
2022
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IF 46.048
Qing Han,Wei Guo,Xiaofeng He,Tongchao Liu,Xiao Liu,Xuebing Zhu,Tengfei Bian,Lei Jiang,Jun Lu,Yong Zhao
Aprotic lithium-oxygen (Li-O 2 ) batteries have attracted extensive attention due to their ultrahigh theoretical energy density. However, slow and undesired electron transfer during cathodic reactions causes low cyclic stability in these batteries. Here, we demonstrate that O 2 mass transport and electron transfer for cathodic reactions in Li-O 2 batteries could be decoupled by a double-cathode structure that efficiently enables stable electron transfer between the cathode and Li 2 O 2 /O 2 . This resolves various side reactions and slow Li 2 O 2 reaction kinetics issues in conventional Li-O 2 batteries, leading to stable operation of the cell for nearly 2 months at a capacity of 0.2 and 5 mAh cm −2 , with more than 4- and 10-fold increases in cycle life when compared with single-cathode batteries. These remarkable improvements in the cyclic stability of Li-O 2 batteries with double cathodes provide an interesting concept for improving the operational stability of other metal-rechargeable batteries with conversion-type chemistry.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）