JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Yuan Wang,Hanzhi Wang,Tian C. Zhang,Shaojun Yuan,Bin Liang
A novel hierarchical porous carbon derived from poly(p-phenylenediamine) incorporated with reduced graphene oxide (rGO) is prepared for CO 2 capture and supercapacitors . In this synthesis, chemically in-situ oxidative polymerization and KOH chemical activation are employed with the controllable introduction of GO (GO/Polyphenylenediamine = 0–2 wt%). The obtained carbon material (APG-1%) with high surface area (860.4 m 2 g −1 ) and rich N content (7.91 wt%) exhibits excellent CO 2 capture ability (4.65 mmol g −1 at 298 K, 5 bar) and good electrochemical performance as a supercapacitor electrode with 158.5 F g −1 in 6 M KOH at a current density of 1 A g −1 . Even at a high current density of 10 A g −1 , a capacity of 115.2 F g −1 is still maintained. The rational addition of rGO provides an effective strategy of simultaneous improvement of CO 2 adsorption and capacitive performance.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Xiaobin Zhou,Mengke Wang,Junyang Chen,Xiaolei Xie,Xingguang Su
Single atom nanozymes are the artificial enzymes with enzyme-like activity, which have attracted a great deal attention in recent years due to their unique merits such as remarkable stability, excellent atom utilization and low cost. Herein, a convenient and sensitive colorimetric strategy was developed for the sensing of galactose based on Fe–N–C single-atom nanozyme (Fe-SAzyme). The Fe-SAzyme was prepared through “isolation-pyrolysis” method that exhibited intrinsic peroxidase mimicking activity, which can quickly catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue-colored oxTMB in the presence of hydrogen peroxide (H 2 O 2 ). Galactose can be oxidized by galactose oxidase (Gal Ox) to generate H 2 O 2 , and Fe-SAzyme can be utilized for quantitative colorimetric detection of galactose. A good linearity between absorbance and the galactose concentration in the range of 50–500 μM was obtained with a detection limit of (LOD) 10 μM. The Fe-SAzyme based colorimetric strategy offered a rapid, convenient and economic way for galactose quantification detection, which could be used as an alternative method for galactosemia diagnosis.
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Xiaoying Zhai,Weiguo Lin,Jinkai Liu,Xu Chen,Junfeng Yong,Wensheng Yang
The development of earth-abundant electrocatalysts to replace noble metal for oxygen reduction reaction (ORR) has attracts tremendous interest. In this work, Fe, N-codoped porous carbon-embedded Fe 3 C nanoparticles (Fe 3 C/Fe, N-PCR) is fabricated from petroleum vacuum residue via a simple template-assisted and subsequent doping-assisted calcination method. The unique hybrid material shows great features: abundant active sites including pyridinic N, Fe N, and Fe 3 C nanoparticles, a relatively large surface area (509.3 m 2 g − 1 ) and 3D interconnected hierarchical porous structure. The Fe 3 C/Fe, N-PCR as an electrocatalyst exhibits remarkable ORR catalytic activity in alkaline medium, with a high onset potential of 1.02 V and half-wave potential of 0.86 V, which surpass commercial Pt/C (20 wt%) by ca. 30 and 20 mV, respectively. Moreover, Fe 3 C/Fe, N-PCR has outstanding long-term stability and tolerance to methanol poisoning, outperforming Pt/C. Combining with the exciting performance, abundant and cheap raw material, and facile synthetic method, Fe 3 C/Fe, N-PCR catalyst has promising future in ORR. This study also provides a new approach for high value utilization of petroleum vacuum residue.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 17
·7417-7431
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IF 3.553
Meng Xingtong,Jia Shuai,Mo Lanlan,Wei Jie,Wang Feijun,Shao Ziqiang
Nowadays, it has become a trend to prepare porous carbon as electrode materials for supercapacitors by using biomass and its derivatives by virtue of its low cost, abundant source and environmental friendliness. Carboxymethyl cellulose ammonium (CMC-NH 4 ), a kind of cellulose derivative, is used as a carbon precursor and O/N source to prepare carbon material through cross-linking with aluminum ions, lyophilization, carbonization and activation. The as-prepared O/N-co-doped carbon samples (ONAC-500, ONAC-600 and ONAC-700) exhibit hierarchically porous structure with different size pores in carbon framework, ensuring electrolyte ions effective transport and diffusion. Meanwhile, the ONAC-600 reveals a high specific surface area of 2658 m 2 g −1 , abundantly porous structure with pore volume of 1.32 cm 3 g −1 and effective O/N-doping, which ensure a high capacitance of 465.0 F g −1 at 1 A g −1 in 3 M KOH three-electrode system. It also shows better rate capability and good stability after 10000 cycled under 10 A g −1 . Besides, the assembled all-solid-state supercapacitor with ONAC-600 delivers an acceptable energy density of 7.8 Wh kg −1 at a power density of 124.2 W kg −1 .
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1336-1342
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IF 5.721
Ziqi Zhang,Kaida Yao,Linchuan Cong,Zhuochen Yu,Lina Qu,Weimin Huang
Ammonia is one of the most important agricultural fertilizers and renewable energy carriers, and is also one of the most highly produced inorganic compounds in the world. The traditional industrial ammonia synthesis mainly uses the Haber–Bosch method, which consumes a large amount of fossil fuels and emits a lot of greenhouse gas. Thus, a more environmentally friendly method is needed for the production of ammonia. In this paper, we present a new electrocatalyst to produce NH3 under ambient conditions, which was obtained via the carbonization of Ru-dispersed ZIF-8. As a result, the catalyst could achieve a maximum NH3 production rate of about 16.68 μgNH3 h−1 mgcat.−1 at −0.4 V (vs. RHE) and a faradaic efficiency of 14.23% at −0.3 V (vs. RHE) at room temperature and ambient pressure in 0.1 M KOH. Also, the loading of Ru is only 16 wt%. Thus, this work provides a feasible method to design highly dispersed noble metal electrocatalysts for the nitrogen reduction reaction (NRR).
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Small Methods
·
2020
·Vol. 4
·期 9
·2000208
·
IF 12.13
Chaoxiong Zhang,Haoxuan Liu,Yifan Liu,Xijun Liu,Yuying Mi,Ruijie Guo,Jiaqiang Sun,Haihong Bao,Jia He,Yuan Qiu,Junqiang Ren,Xiangjun Yang,Jun Luo,Guangzhi Hu
Using hydrazine oxidation reaction (HzOR) to replace the oxygen evolution reaction is an effective way to decrease the overpotential of the anodic reaction in overall water splitting (OWS), facilitating cost-effective and safe hydrogen production. Herein, Rh 2 S 3 /N-doped carbon hybrids (Rh 2 S 3 /NC) are first reported as novel and efficient bifunctional electrocatalysts for hydrazine-assisted hydrogen generation over a wide pH range. Specifically, Rh 2 S 3 /NC exhibits low overpotentials for the hydrogen evolution reaction (HER) in alkaline (38 mV), neutral (46 mV), and acidic (21 mV) electrolytes, to reach the current density of 10 mA cm −2 , and maintains the activities over 70 h. Meanwhile, Rh 2 S 3 /NC also displays competitive HzOR performance at all-pH electrolytes. Thus, serving as a bifunctional electrocatalyst for both HER and HzOR, Rh 2 S 3 /NC shows overwhelming-Pt/C performance in three electrolytes, and can save over 93.3%, 85.2%, and 78.3% energy consumption compared to the corresponding OWS system. Moreover, theoretical calculations confirm that Rh 2 S 3 /NC owns low free-energy changes of the H adsorption and the dehydrogenation of adsorbed NHNH both of which are beneficial to enhance catalytic activity. This work develops a novel bifunctional electrocatalyst with free pH-dependent condition for the hydrazine-assisted electrolysis system to furtherly reduce the cost of massive industrial H 2 production.
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Environmental Science-Nano
·
2020
·Vol. 7
·期 10
·3007-3019
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IF 7.683
Yingjie He,Lei Huang,Yixian Zhao,Weichun Yang,Taixu Hao,Bichao Wu,Haoyu Deng,Dun Wei,Haiying Wang,Jian Luo
Capacitive deionization (CDI) by Ag@C electrodes is a promising desalination technology for chlorine removal because there is no waste flow and no additional chemicals used during the removal and regeneration/cleaning processes. However, its efficacy and capacity are significantly limited by the low stability of Ag/C composites during the electrochemical process. In this study, we synthesized a new highly stable structure of Ag@C composites (named as Ag/N-CNP) through reductive adsorption of Ag+ by a polyaromatic amine followed by carbonization. We used in situ Raman spectroscopy, for the first time, to monitor in real-time the Cl− electrosorption/desorption process of Ag/N-CNP electrodes, which revealed that the stability of Ag@C electrodes was mainly controlled by the dissolution of Ag. The newly synthesized Ag–Nx structure stabilized Ag nanoparticles and uniformly distributed Ag species on the carbon matrix, which resulted in a high affinity for Cl− and significantly improved cyclic dechlorination performance. Results showed that the electrosorption capacity of the newly synthesized Ag/N-CNP electrodes could reach 75.3 mg g−1, substantially higher than that of traditional carbon electrodes. Moreover, such a capacity had almost no loss (only 1.4% loss) after 50 continuous treatment cycles and could still retain 76% after 100 cycles, demonstrating a highly reliable and cost-effective desalination performance significantly superior to that of previously reported Ag@C electrodes.
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CHINESE JOURNAL OF CATALYSIS
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2020
·
IF 6.146
Feiyue Ge,Shuquan Huang,Jia Yan,Liquan Jing,Feng Chen,Meng Xie,Yuanguo Xu,Hui Xu,Huaming Li
Expanding the optical absorption range of photocatalysts is still a key endeavor in graphitic carbon nitride (g-C 3 N 4 ) studies. Here, we report on a novel thiophene group extending the optical property, which is assigned to n-π* electronic transitions involving the two lone pairs on sulfur (TLPS). The as-prepared samples, denoted as CN-ThA x (where x indicates the amount of ThA added, mg), showed an additional absorption above 500 nm as compared to pristine g-C 3 N 4 . Further, the thiophene group enhanced charge carrier separation to suppress e − /h + pair recombination. The experimental results suggest that the thiophene group can obstruct the polymerization of melem to generate a large plane, thus exposing the lone electron pairs on the sulfur. The photocatalytic activity was evaluated in the decomposition of bisphenol A and H 2 evolution. Compared with g-C 3 N 4 , the optimized CN-ThA 30 sample led to a 6.6- and 2-fold enhancement of the degradation and H 2 generation rates, respectively. The CN-ThA 30 sample allowed for synchronous H 2 production and BPA decomposition.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yang Hui,Chen Yingxi,Wang Chunbao,Wang Guangjin
Because of low-cost, marvelous activity and excellent stability characteristics, nonprecious metal carbide-based catalysts are promising candidates for hydrogen evolution reaction (HER). However, inferior specific surface area and undesirable catalytic activity of pure phase carbides greatly impedes their industrialization process. Herein, ultrafine Mo 2 C nanoparticles embedded in N-doped carbon nanosheet has been synthesized by a facile strategy. High viscosity of guar gum alleviates the aggregation of nanocrystals by providing space-confinement effect; besides, NaCl plays two roles: (1) hard template directing the formation of carbon nanosheet; (2) molten salt adjusting the nucleation and growth process of Mo 2 C to ensure the formation of ultra-small Mo 2 C nanoparticles. Two-dimensional sheet-like carbon accelerates the electron transfer , and rich heterojunction between ultrafine Mo 2 C and N-doped carbon facilitates boosting the HER catalytic activity. The prepared Mo 2 C/NCS with optimized composition exhibit excellent electrocatalytic activity and stability both in acidic (189 mV at a current density of 10 mV/cm 2 with a Tafel slope of 61.2 mV/dec) and alkaline medium (142 mV at a current density of 10 mV/cm 2 with a Tafel slope of 56.1 mV/dec). This work may provide insight for developing economic and high-efficient catalysts for water splitting.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Guangjian Peng,Yiheng Sun,Guijing Dou,Yahao Hu,Weifeng Jiang,Taihua Zhang
Accurate evaluation of the shell elastic modulus of microcapsules is of great significance to understanding their performance during production, processing, and applications. In this work, microcompression was employed to investigate the elastic behaviors of a single microcapsule. It was modeled as a microsphere with a core–shell structure compressed between two rigid plates. Based on the assumption that the contact pressure between the microsphere and plates obeys parabolic distribution, a microcompression method derived from the Reissner’s theory and the modified Hertz contact theory was established to evaluate the shell elastic modulus. Applications were carried out on poly(methylmethacrylate) (PMMA) microcapsules containing n-octadecane. The average elastic modulus of PMMA shells measured by the proposed microcompression method agrees well with that of the bulk PMMA sample. Furthermore, the elastic modulus of PMMA shells was found to have size dependence on the diameter of the microcapsules. Finally, finite element models combined with the newly proposed method were constructed to accurately predict the microcompression behaviors of microcapsules with different sizes.
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PubMed
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TALANTA
·
2020
·
IF 5.339
Yang Tian,Ruizhi Tang,Luyao Liu,Yang Yu,Shujuan Ma,Bolin Gong,Junjie Ou
Hydrophilic interaction chromatography (HILIC), as one of the important methods for glycopeptides enrichment, has attracted the attention of more and more researchers due to the high efficiency in glycopeptides enrichment. Ordered mesoporous silica materials have been used in many fields, such as catalysis, separation and drug delivery, owing to their adjustable pore size, excellent mechanical properties and ease of preparation. In our case, a series of ordered mesoporous silicas with different pore sizes (3.7–16.7 nm) were prepared via sol-gel reaction employing F127 as the template and TEOS as the silica source. After modified with glutathione by photo-initiated thiol-ene reaction, these materials exhibited hydrophilicity and could be used as adsorbents of HILIC for capturing N-linked glycopeptides from IgG and serum protein tryptic digests. Up to 26 N-glycopeptides were identified from IgG digest, and 565 N-glycopeptides and 330 N-glycosylation sites, mapped to 159 glycoproteins , were identified from 2 μL human serum digest, indicating the great ability for enriching N-glycopeptides from complex biological samples.
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PubMed
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Feifei Zhao,Tianyi Zhang,Qian Liu,Changli Lü
For most of the carbon dots (CDs), solid-state fluorescence and room temperature phosphorescence (RTP) are difficult to achieve due to self-quenching and intersystem crossing (ISC) limitations. Here, nitrogen-doped CDs-1 showing both fluorescence and RTP was obtained by hydrothermal reaction from polyvinyl alcohol (PVA) and 5-amino-1,10-phenanthroline (Aphen). The CDs-1 emits blue-green fluorescence in aqueous solution, while emits white fluorescence and yellow-green RTP in the solid state with a RTP lifetime up to 103 ms, exhibiting a long afterglow with a duration of 3 s, which is visible to the naked eyes. The RTP of the CDs-1 is derived from the C N/C N in Aphen and C N/CN in Aphen and C O produced during the carbonization process with a small energy gap between the singlet and triplet states, which helps to realize the ISC. At the same time, the hydrogen bonds between the C N/CN or CO bonds and O H of the not completely carbonized PVA chains on the CDs-1 surface have the advantages of moisture resistance, oxygen barrier and improving the rigidity of CDs-1. Eventually, non-radiative transitions can be suppressed. Based on the decent fluorescence properties, the aqueous solution of CDs-1 can be used to detect TNP and is responsive to pH with a good linear relationship between acid and alkali. In addition, the RTP of CDs-1 can be utilized as banknote anti-counterfeiting material under a long excitation wavelength. This work provides a possibility to realize the multi-mode illumination regulation of CDs by facile one-step strategy.
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