SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Jiaxin Liu,Keke Ning,Yao Fu,Yujie Sun,Jiangong Liang
N-acetyl-beta-D-glucosaminidase (NAG) is an important biomarker for early clinical diagnosis of renal disease, suggesting the necessity to develop a fast and sensitive method for its detection. In this paper, we developed a fluorescent sensor based on polyethylene glycol (4 0 0) (PEG-400)-modified and H 2 O 2 -assisted etched sulfur quantum dots (SQDs). According to the fluorescence inner filter effect (IFE), the fluorescence of SQDs can be quenched by the p-nitrophenol (PNP) generated by NAG-catalyzed hydrolysis of p-Nitrophenyl-N-acetyl-β-D-glucosaminide (PNP-NAG). We successfully used the SQDs as a nano-fluorescent probe to detect the NAG activity from 0.4 to 7.5 U·L −1 , with a detection limit of 0.1 U·L −1 . Furthermore, the method is highly selective and was successfully used in the detection of NAG activity in bovine serum samples, suggesting its great application prospect in clinical detection.
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高影响因子
Metals
·
2023
·Vol. 13
·期 3
·518
·
IF 2.9
Weigang Zhao,Cuirong Liu,Xu Yin
The sodium battery is one of the best energy storage technologies due to its abundant resource reserves and excellent energy storage ability. As a two-dimensional layered transition metal, molybdenum selenide (MoSe2) has large interlayer spacing and a high theoretical capacity (470 mAh∙g−1). Its structure is suitable for the negative electrode of sodium-ion batteries, with a large ionic radius and slow ion diffusion kinetics. However, it is difficult for the rate capability and cycling performance of MoSe2to meet practical needs due to a weak intrinsic electron transport ability and volume expansion during sodium absorption. The hydrothermal synthesis method was used to synthesize the MoSe2complex based on boron and nitrogen dual-doped 3D carbon fibers obtained from bacterial cellulose membranes (MoSe2/N&B-BCM) for sodium batteries. Additionally, electrochemical analysis and experimental characterization were performed. In summary, the experimental analysis shows that MoSe2/N&B-BCM has excellent conductivity, structural integrity, cyclability (328 mAh∙g−1after 100 cycles at a 0.5 c constant rate), and rate stability.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 7
·1-13
·
IF 2.8
Guo Yitong,Du Jingyang,Hu Meihua,Wei Bin,Su Taichao,Zhou Aiguo
In this paper, the thermoelectric (TE) performance of Bi 2 Te 3 was improved by the incorporation of Mo 2 C MXene, which is a novel two-dimensional material with moderate TE performance. The TE properties of Mo 2 C MXene were characterized from bulk samples bonded with 5 wt% Al sintered by spark plasma sintering (SPS) at 623 K for 6 min. Due to the very weak TE performance of Al, the performance of Mo 2 C MXene/Al composite reflects that of Mo 2 C MXene. It is an N-type conductor with the Seebeck coefficient of − 9.25 µV/K at 600 K. This is the first report to characterize the TE performance of Mo 2 C MXene bulk samples. Thereafter, Bi 2 Te 3 /Mo 2 C MXene composite powders were prepared from Mo 2 C MXene powers and precursors of Bi 2 Te 3 by hydrothermal method at 453 K for 24 h. The bulk samples of Bi 2 Te 3 incorporated with Mo 2 C MXene was obtained by SPS at 523 K for 7 min. The composites are N-type conductors. The electrical conductivity was remarkably increased with the content of Mo 2 C MXene, while the thermal conductivity slightly decreased. The sample with 5 vol% Mo 2 C MXene showed the optimal thermoelectric properties, and its ZT value was 0.26 at 473 K. At 450 K, the ZT value (~ 0.25) of that sample was 78.6% higher than that of Bi 2 Te 3 (~ 0.14). This is the first report on regulating TE performance by the incorporation of Mo 2 C MXene, a 2D material with intrinsic TE performance.
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Journal of Environmental Sciences
·
2023
·
IF 6.9
Yuqi Gan,Xiaohui Lu,Shaodong Chen,Xinghua Jiang,Shanye Yang,Xiewen Ma,Mei Li,Fan Yang,Yewen Shi,Xiaofei Wang
The reaction of carbonyl-to-imine/hemiaminal conversion in the atmospheric aqueous phase is a critical pathway to produce the light-absorbing N-containing secondary organic compounds (SOC). The formation mechanism of these compounds has been wildly investigated in bulk solutions with a low ionic strength. However, the ionic strength in the aqueous phase of the polluted atmosphere may be higher. It is still unclear whether and to what extent the inorganic ions can affect the SOC formation. Here we prepared the bulk solution with certain ionic strength, in which glyoxal and ammonium were mixed to mimic the aqueous-phase reaction. Molecular characterization by High-resolution Mass Spectrometry was performed to identify the N-containing products, and the light absorption of the mixtures was measured by ultraviolet-visible spectroscopy. Thirty-nine N-containing compounds were identified and divided into four categories (N-heterocyclic chromophores , high-molecular-weight compounds with N-heterocycle, aliphatic imines/hemiaminals, and the unclassified). It was observed that the longer reaction time and higher ionic strength led to the formation of more N-heterocyclic chromophores and the increasing of the light-absorbance of the mixture. The added inorganic ions were proposed to make the aqueous phase somewhat viscous so that the molecules were prone to undergo consecutive and intramolecular reactions to form the heterocycles. In general, this study revealed that the enhanced ionic strength and prolonged reaction time had the promotion effect on the light-absorbing SOC formation. It implies that the aldehyde-derived aqueous-phase SOC would contribute more light-absorbing particulate matter in the industrial or populated area where inorganic ions are abundant.
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高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Jiaojiao Guan,Daorong Li,Jiahui Feng,Peng Xu,Zhaonian Li,Siqi Ge,Hongxia Chen,Kunfeng Zhang
The removal of ammonia (NH 3 ) emitted from agricultural and industrial activities is of great significance to protect human health and ecological environment. Photocatalytic NH 3 oxidation to N 2 under mild conditions is a promising strategy. However, developing visible light photocatalysts for NH 3 oxidation is still in its infancy. Here, we fabricate N-TiO 2 and Ag/AgCl/N-TiO 2 photocatalysts by sol-gel and photodeposition methods, respectively. The introduction of N not only endows TiO 2 with visible light response (absorption edge at 460 nm) but also results in the formation of heterophase junction (anatase and rutile). Thus, N-TiO 2 shows 2.0 and 1.8 times higher than those over anatase TiO 2 and commercial TiO 2 for NH 3 oxidation under full spectrum irradiation. Meanwhile, surface modification of Ag can simultaneously enhance visible light absorption (generating localized surface plasmon resonance effect) and charge separation efficiency. Therefore, the photocatalytic activity of Ag/AgCl/N-TiO 2 is further improved. Furthermore, the presence of N and Ag also enhances the selectivity of N 2 product owing to the change of reaction pathway. This work simultaneously regulates photocatalytic conversion efficiency and product selectivity, providing some guidance for developing highly efficient photocatalysts for NH 3 elimination.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 5
·1261-1268
·
IF 2.5
Deng Hao-chen (Preston),Hao Qingzhu,Wang Yuhang
The COVID-19 pandemic that is still prevalent around the globe each day consumes massive disposable face masks and consequently lays a heavy burden on waste management. Meanwhile, the incineration of these medical wastes further escalates the already overwhelming carbon emission that leads to global warming and climate change. To offer a potential solution addressing medical waste and CO 2 emission challenges, we herein develop a synthetic protocol to upgrade face masks into Ni, N-doped graphene (Ni–N-C) sheet catalysts for selectively reducing CO 2 into CO electrochemically. The high specific surface area and the uniform dispersion of Ni active sites of the catalyst derived from a regular disposable face mask enable a near-unity CO Faradaic efficiency (FE) at the current density of 200 mA cm −2 . This study offers outside-of-the-box thinking to address environmental issues by turning medical wastes into CO 2 reduction catalysts.
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高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Kexin Huang,Yanxing Hui,Zhongyun Yang,Muhammad Waqas,Fangfang Fan,Limin Wang,Xiaotian Liu,Qiulan Huang,Dujuan Huang,Du-Hong Chen,Youjun Fan,Wei Chen
Electrochemical energy (e.g., fuel cell and metal-air batteries) is featured by large theoretical energy density, high conversion efficiency, safe operation and pollution-free emission. However, the sluggish dynamics of oxygen reduction reaction (ORR) and high cost of noble metals hinder their widespread commercial applications in electrochemical energy devices. Herein, we present a method for the preparation of the N, S co-doped carbon film wrapped Co nanoparticles (Co/NSC) for ORR by aging and then pyrolyzing the mixture of cobalt salt and 1-(p-Toluenesulfonyl)imidazole. The co-doping of N and S facilitates the electron rearrangement of the carbon film, resulting in a rapid electron transfer. The core-shell structure enhances the interaction between N, S co-doped carbon film and Co nanoparticles. These features endow the Co/NSC catalyst an excellent ORR with a half-wave potential of 0.860 V and limiting current density of 6.2 mA cm -2 , besides the superior anti-methanol. The Co/NSC catalyst as the air cathode grants the assembled zinc-air battery high open circuit voltage (1.467 V), large peak power density (156.2 mW cm -2 ), great specific capacity (747.9 mAh g Zn -1 ), and excellent stability. Thus, the prepared Co/NSC catalyst exhibits a promising application in zinc-air battery. This work provides an approach for the synthesis of the carbon-shell coated non-noble metal catalyst and its subsequent applications in oxygen electrocatalysis.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6058-6065
·
IF 3.3
Xu Zhang,Jingxian Zhang,Shi Zeng,Haifan Wang,Yiling Bai,Huaming Hou,Ke Zhang,Bin Li,Guangjin Zhang
Iron–nitrogen-doped carbon (Fe–N–C) catalysts have been theoretically and experimentally demonstrated as one of the most promising materials to promote the oxygen reduction reaction (ORR), but they still have drawbacks in terms of stability and longevity. Herein, a novel strategy of loading Fe–N–C on cerium oxide cyanamide (Ce2O2CN2) is proposed to increase the density of active sites and improve the activity effectively. Ce2O2CN2 provides a Ce4+/Ce3+ redox pair to regulate the oxygen density on the catalyst surface, and the π–π interactions between Ce2O2CN2 and Fe–N–C are beneficial for interfacial charge transport. Consequently, Fe–N–C@Ce2O2CN2 shows excellent ORR activity with a half-wave potential (E1/2) of 0.89 V vs RHE and satisfactory long-term durability in an alkaline medium, and significantly outperforms commercial Pt/C. The Zn–air batteries made using the prepared catalyst exhibited a high peak power density of 119.35 mW cm−2. This study provides a new perspective for the application of platinum group-metal (PGM)-free catalysts in next-generation energy storage devices.
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RADIATION PHYSICS AND CHEMISTRY
·
2023
·
IF 2.9
Junhua Luo,Li Jiang,Long He,Liang Zhou
The secondary nuclear decay method was applied for the cross-section measurement of the 81 Br(n,2n) 80m Br reaction. As a result, the cross-sections of the 81 Br(n,2n) 80m,g Br reactions with a detailed uncertainty propagation and their isomeric cross-section ratios σ m /σ g were obtained at four neutron energies within the range from 13 to 15 MeV by applying an activation and off-line γ-ray spectrometric technique. The Br-based samples and Nb-based monitor foils were activated together to determine both the reaction cross-sections and the incident neutron flux . The neutron beam was formed via the 3 H( d , n ) 4 He reaction. The cross-sections were also calculated by using a theoretical nuclear model code TALYS-1.95 with different options of level density at neutron energies varying from the reaction threshold to 20 MeV. The extracted results were analytically discussed and compared with the corresponding theoretical and evaluated data from the published works in the literature.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yu Liu,Zhichao Miao,Manfen Liang,Jie Zhang,Jinping Zhao,Leilei Xu,Jin Zhou,Shuping Zhuo
Electrocatalysis of CO 2 to CO is not only conducive to the artificial carbon cycle, but also green and efficient technology for producing chemicals. In consideration of the practical application, the novel strategy for large-scale preparation of catalyst has great potential to be developed. Herein, a facile one-step approach was developed for constructing a group of N -doping carbon-encapsulated metal catalysts (M@N C (M = Fe, Co, and Ni)) for CO 2 electroreduction to CO. In addition, the impact of metal on catalytic performance was detailedly researched. Specifically, the Ni@N C catalyst achieves an excessive CO Faraday efficiency (FE CO ) (>90 %) on a broad achievable potential window of − 0.67 V to − 0.97 V vs RHE in the H-type cell. The optimal catalyst attains a FE CO of 98 % at − 0.57 V vs RHE and an industrial-relevant current density of 430 mA cm −2 at − 1.07 V vs RHE in the flow cell. This work provides a facile way to fabricate catalyst on a large scale with preeminent performance for industrial CO 2 electroreduction to CO.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yuwei Shen,Dingchang Shi,Liangbin Liu,Fan Liao,Wenxiang Zhu,Mingwang Shao
The electrocatalytic activity is closely associated with the electronic structure of catalysts. Electron-deficient palladium (Pd) has been proved to show better oxygen reduction reaction performance than the electrophilic one due to the downshift of the d-band center. In this work, Pd nanoparticles are uniformly dispersed in F, N-doping graphene with the assistant of silicon nanowires and hydrofluoric acid (Pd/F, N-doping G). A strong interaction between the metal and doped-graphene leads to the electron-deficiency of the modified Pd, which is beneficial for obtaining proper adsorption energy of oxygen species. The as-prepared Pd/F, N-doping G-3 catalyst shows a four-electron oxygen reduction pathway with large half-wave potential of 0.87 V and high onset potential of 0.99 V in 0.1 M KOH. In addition, the Pd/F, N-doping G-3 based zinc-air battery exhibits an open potential of 1.40 V and a high power density of 229 mW·cm–2.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Mengya Guo,Li Wang,Yuying Gao,Guozhu Li
Doping carbon materials with Fe and N attracts great attention due to its promising application in preparing ORR electrode with high performance and low cost. Previously, Fe, N-codoped catalyst (Fe/N/C) had been synthesized via a simple one-pot method using carbon materials, dopamine and FeCl 3 by our group. However, the unstable activity and low selectivity (electron transfer number of ∼3.5) are key problems that should be solved. Herein, trace sulfur has been introduced into Fe, N-codoped carbon black by using 2-mercaptoethanol as an adhesive sulfur precursor. By the doping of trace S atoms (∼0.25 at%) into Fe, N-codoped carbon frameworks, the ORR performance has been obviously improved simply without any re-treatment process, such as acid-etching or nitrogen supplement. The mechanism of this process has been systematically investigated by changing the amount of initial sulfur precursor. A moderate amount of trace sulfur can effectively enhance the ORR performance of Fe, N-codoped carbon black due to suitable interactions among Fe, N, S and C elements. Both the content and the state of Fe and N species on the surface of carbon black can be changed and controlled by trace sulfur. The as-synthesized 1.0 S Fe/N/C catalyst exhibits a good ORR activity (E 1/2 = 0.749 V, J k = 54.56 mA cm −2 ) and a total 4-electron selectivity. 1.0 S Fe/N/C also shows better catalytic stability and methanol tolerance than 20 wt% Pt/C.
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