JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yingjie Guo,Zhongke Wang,Yuyang Wang,Lixia Ma,Nan Zhang,Ruibin Jiang
The development of nonprecious metal-based electrocatalysts for oxygen reduction reaction (ORR) is a central task in renewable electrochemical energy conversion and storage technologies. Iron-nitrogen doped carbon-based (Fe−N/C) materials are promising alternatives to Pt-based ORR electrocatalysts. Owing to large specific surface area and outstanding electrical conductivity, carbon black is an inborn support for electrocatalysts. Unfortunately, the direct incorporation of Fe−N x moieties onto the surface of carbon black has not been realized to date. Herein, Fe−N x moieties are directly incorporated onto the surface of carbon black through surface modification and the following Fe and N co-doping. The obtained Fe and N co-doped carbon back (Fe−N/CB) catalyst has very large specific surface area and abundant accessible Fe−N x moieties. As a result, Fe−N/CB electrocatalyst exhibits a more positive half-wave potential (0.86 V) than Pt/C. The Fe−N/CB catalyst also displays better stability and methanol resistance than Pt/C. The Zn-air battery with Fe−N/CB as cathodic catalyst shows a maximum power density of 68 mW cm −2 and a specific capacity of 676 mAh g Zn -1 . Our finding provides a convenient and low-cost approach to fabricating efficient M−N/C-based catalysts and will be helpful to the development of renewable electrochemical energy conversion and storage technologies.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Canhong Zhu,Jiani Wu,Xueting Jin,Yinghua Yan,Chuan-Fan Ding,Keqi Tang,Qiaohong Zhang
Herein, a hydrophilic graphene composite functionalized with glutathione (GSH) and L(+)-Cysteine (Cys) was prepared via a simple and fast synthesis route, which was named G@S@Au@GC. The combination attack with two different zwitterionic polymers resulted in enhanced adsorption sites for glycopeptides. The obtained G@S@Au@GC exhibited excellent performance on a low limit of detection (0.2 fmol), a high selectivity (HRP: bovine serum albumin = 1:1500), a good load capacity (250 μg•mg −1 ) and recovery rate (93%), which was also evaluated with IgG. Subsequently, 60 glycopeptides from complex biological sample (human saliva) were identified by Nano-LC-MS/MS. The advantages of combination attack, low-cost, simple and fast synthesis, and superior enrichment performance make G@S@Au@GC composite a bright future on glycoproteomics analysis and related diseases.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Kang Ji,Katarzyna Matras-Postolek,Ruixia Shi,Ling Chen,Quande Che,Junpeng Wang,Yunlong Yue,Ping Yang
MoS 2 /CoS 2 heterostructures on nitrogen-doped carbon nanosheets as an efficient electrocatalyst for hydrogen evolution reaction (HER) are prepared using zeolitic imidazolate frameworks-67 as precursors. Two dimensional (2D)/2D MoS 2 /CoS 2 heterostructures consist of layered CoS 2 and MoS 2 . The (210) facet of CoS 2 and the (002) facet of MoS 2 contacted vertically resulted in improved electrons and holes transfer in the interface. The ratios of CoS 2 /MoS 2 plays an important role to get high performance (CoS 2 /MoS 2 /NC-n%, e.g. n = 20, 25, 30, 35 wt%). Meanwhile, sample CoS 2 /MoS 2 /NC-25% revealed the best HER activity, suggesting the sample has the largest number of active sites and the fastest electron transfer rate. In addition, sample CoS 2 /MoS 2 /NC-25% exhibited the lowest onset potential of 51 mV, the lowest potential of 215 mV at 10 mA cm −2 , and the smallest Tafel slope of 80.0 mV dec −1 . The result is utilizable for the construction of heterostructures with excellent HER performance.
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高影响因子
NANO
·
2021
·
IF 1.556
Mengting Zhang,Xiaorong Li,Hong Xiao,Bin Zhao,Wei Bian
Graphene quantum dots (GQDs) have been extensively used in biosensors and bioimaging. Heteroatom-doped GQDs can regulate material properties and endow them to improve structural and physicochemical properties. In this work, N,S-GQDs were prepared through a high-temperature pyrolysis method using L-cysteine and citric acid as the precursors. The morphology and structure of nanocomposites were identified by TEM, X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS), and FTIR. The as-prepared N,S-GQDs show bright blue fluorescence with satisfactory fluorescence quantum yield. N,S-GQDs display significant response to riboflavin, achieving a low detection limit of 27 nM. The reaction of N,S-GQDs to riboflavin is mainly governed by static quenching. The detection of riboflavin in real samples has been performed to demonstrate its practical application. The obtained N,S-GQDs have low cytotoxicity and have been applied successfully in cell imaging.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 37
·17332-17338
·
IF 3.591
Xue Bai,Bo Liu,Wei Zhang,Yang Wang,Yu Yu,Yang Yang,Jianping Guo
A porous Cu2O/TiO2 hybrid photocatalyst with n-type Cu2O decorated on the mesoporous TiO2 derived from MIL-125 was designed through the in situ Cu2+ ion reduction strategy. Under UV-vis light irradiation, the Cu2O/TiO2 composite with 4.2 wt% of Cu2O displayed the highest hydrogen evolution rate of 14.39 mmol h−1 g−1, which was about 9.6 and 24.8 times that of the original mesoporous TiO2 and pure Cu2O, respectively. The enhancement in photocatalytic activity can be mainly attributed to the type-I band structure formed, which can efficiently enhance the photoexcited charge carrier mobility across the phase interfaces of the Cu2O/TiO2 composite, as evidenced by the UV-DRS spectra, Mott–Schottky curves, and XPS analysis. Besides, the narrow band gap of Cu2O, conducive to the absorption of visible light, and the high specific surface of TiO2 were also found to contribute to the photoactivity enhancement. This work will provide a new perspective for the study of type-I photocatalysts.
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IONICS
·
2021
·Vol. 27
·期 9
·3975-3985
·
IF 2.817
Wang Zhiyi,Wang Yutian,Tang Jingtao,Wang Kaizhao,Chen Tianyou,Wang Kaijun,Hu Jin
Among the currently studied nitrogen-doped Pt-C catalysts, the environmental friendliness of the nitrogen source and the stability of Pt-C catalysts for fuel cells are urgent issues to be solved. In this study, nitrogen-doped platinum-based catalyst (CSC/BP-Pt) with excellent stability for the ORR is prepared by a self-doping method based on chitosan (CS), a green biomass material with both nitrogen and carbon sources, in combination with conductive carbon black (BP2000). Finally, the N content of the catalyst is as high as 5.8 wt%, which is higher than most comparable catalysts (3–5 wt%). And electrochemical tests show that the CSC/BP-Pt electrochemical active surface area (ECSA) = 154.1 m 2 /g Pt , half-wave potential (E 1/2 = 0.85 V RHE ) has a better electrochemical performance than the commercial Pt/C (20 wt%), while the half-wave potential is reduced at 10,000 cycles of cyclic voltammetry with almost no attenuation (only 7 mVcompared to 31 mV of Pt/C). Besides, possible mechanisms to improve the activity and stability of CSC/BP-Pt are preliminarily proposed.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1292-1301
·
IF 5.693
Zhang Pengxiang,Zhang Xihua,Li Bin,Xu Lingan,Dang Feng,Li Bao-Wen
Improving the interfacial impedance matching and attenuation ability of a microwave absorber is an important strategy to obtain excellent microwave absorbing performance. Here, we prepared an ultralight, hierarchical porous single-atom Co–N–C microwave absorber, in which evenly distributed single-atom Co is anchored in a porous N-doped carbon framework by N–Co bond via a facile bio-inspired method. These doped single atoms provide abundant highly active atomic absorption sites on the carbon skeleton, and considerable defects including pyridinic-N, pyrrolic-N, oxidized N, and so forth are introduced into the carbon framework owing to single Co atom doping. These doped single Co atoms and introduced defects act together as strong dipolar/interfacial polarization units, which lead to better impedance matching and a significant increase in attenuation capability of the absorber. The metal Co exists in form of a single atom, benefiting light weight of the absorber. Therefore, an extremely strong reflection loss (RL) value of − 60.9 dB is achieved at a lower filler content of 10 wt% with the absorber thickness of 2.5 mm, and the effective frequency bandwidth covered from 10.4 to 15.1 GHz with a thickness of 2.0 mm at a low filler content of 10 wt%. This research offers a novel route for designing a microwave absorber to improve microwave absorption performance and is expected to a wider range of absorbing materials with different structures. Graphical abstract
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SOLAR ENERGY
·
2021
·
IF 5.742
Yujiao Li,Pin Lv,Chen Li,Fan Xu,Jinbiao Jia,Bingqiang Cao
Traditional P-i-N perovskite solar cells have achieved high efficiency over 25%, but the device structure is relatively complex, and generally requires expensive low-conductivity p-type organic semiconductors as hole transport materials. As a typical semiconductor, it is very important to realize the bipolar doping of methylamine lead iodine (CH 3 NH 3 PbI 3 ) that is the light-absorbing layer of perovskite solar cell. Also, it is significant to develop perovskite cells with new device structure. Here, we chose lithium iodide (LiI) as the dopant and successfully grow p-type Li + doped CH 3 NH 3 PbI 3 (MAPbI 3 :Li) perovskite films with low resistivity (10 3 Ω•cm). The temperature-dependent photoluminescence, Hall effect and Kelvin probe force microscope (KPFM) results strongly confirmed that Li + doping promotes the transformation of pristine weak n-type MAPbI 3 to intentionally doped p-type film. Subsequently, the p-type MAPbI 3 film is used as both the light absorption layer and hole transport layer, and form a PN heterojunction with n-type titanium dioxide (TiO 2 ), which is used as the electron transport layer, to construct the heterostructural perovskite cell with a photoelectric conversion efficiency (PCE) of 10.43%. The electron beam induced current (EBIC) signal also strongly confirms the existence of the PN heterojunction and the new working mechanism of such new solar cells.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Xiuhui Zhai,Xiang Wang,Xinle Pang,Jun Zhang,Qiong Wu,Weidan Na,Yingmei Zhou,Lin Tian
Exploiting effective and low-cost electrocatalysts toward water oxidation is of vital significance for boosting overall water splitting. Herein, we proposed a simple method for constructing dendritic N-doped carbon/ manganese oxides (N-C/MnO x ) hybrid nanocomposites by annealing the composite of nitrogen-doped carbon quantum dots (N-CQDs) and γ-MnOOH (γ-MnOOH@N-CQDs) at different temperatures under N 2 /O 2 atmosphere. The obtained N-C/MnO x exhibited remarkable electrocatalytic activity and stability for oxygen evolution reaction (OER) owing to their unique dendritic structure, rich oxygen vacancies, optimized electronic structure, abundant Mn-C/N, and large electrochemical active area. Among of the prepared N-C/MnO x hybrid nanocomposites, N-C/Mn 2 O 3 showed the best performance toward OER with an overpotential of merely 347 mV to reach to 10 mA cm −2 , along with a small Tafel slope of 75.51 mV dec −1 . More remarkably, by combining Pt/C with N-C/Mn 2 O 3 for overall water splitting, a battery voltage of only 1.67 V is needed to reach the 10 mA cm −2 , rivaling the activity of the state-of-the-art IrO 2 ‖ Pt/C couple.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Chunyan Wang,Jihuai Wu,Shibo Wang,Xuping Liu,Xiaobing Wang,Zhongliang Yan,Liqiang Chen,Xiao Liu,Guodong Li,Weihai Sun,Zhang Lan
The practical applications of perovskite solar cells (PSCs) are limited by further improvement of their stability and performance. Additive engineering and interface engineering are promising medicine to cure this stubborn disease. Herein, an alkali metal fluoride as an additive is introduced into the tin oxide (SnO2) electron transport layer (ETL). The formation of coordination bonds of F– ions with the oxygen vacancy of Sn4+ ions decreases the trap-state density and improves the electron mobility; the hydrogen bond interaction between the F ion and amine group (FA+) of perovskite inhibits the diffusion of organic cations and promotes perovskite (PVK) stability. Meanwhile, the alkali metal ions (K+, Rb+, and Cs+) permeated into PVK fill the organic cation vacancies and ameliorate the crystal quality of PVK films. Consequently, a SnO2-based planar PSC exhibits a power conversion efficiency (PCE) of 20.24%, while the PSC modified by CsF achieves a PCE of 22.51%, accompanied by effective enhancement of stability and negligible hysteresis. The research results provide a typical example for low-cost and multifunctional additives in high-performance PSCs.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 10
·51742
·
IF 3.125
Danning Gao,Qi Zhang,Zhifeng Liu,Fureng Zhang,Faliang Gou,Guiying Xing,Shujing Zhou,Linjun Shao,Jinjing Li,Yijun Du,Chenze Qi
We report the synthesis of palladium nanoparticles encapsulated N-doped carbon nanofibers derived from environmentally benign chitosan. Palladium salt was incorporated into the chitosan/sodium polyacrylate composite nanofibers by electrospinning, followed by carbonization under argon atmosphere to prepare palladium encapsulated mesoporous carbon nanofibers (Pd@Carbon). SEM images shows that the fibrous structures were well retained after carbonization processes. The Raman spectra demonstrates that the ratio of graphite carbon were increased with the carbonization temperature. X-ray powder diffraction and transmission electron microscopy analysis shows that PdO and Pd nanoparticles were formed in the carbon fibers and their sizes grew with the carbonization temperature. The sizes and concentrations of submicroscopic pores inside the nanofibers were analyzed by nitrogen adsorption/desorption experiments and positron annihilation lifetime spectra. Heck reaction catalysis result shows that high carbonization temperature could improve the catalytic activity of Pd@Carbon nanofibers and the nanofibers carbonized at 800°C had the highest catalytic activity. Moreover, the catalytic activity of these novel composite nanofibers was well retained even after recycling for 13 times. The excellent catalytic performance of this fibrous palladium catalyst can be attributed to the N-rich carbon nanofibers and encapsulation of palladium active species inside the ultrathin mesoporous carbon fibers.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·B1594
·
IF 3.12
Huiming Tian,Bing Tan,Xueming Dang,Huimin Zhao
Detecting hydrogen peroxide (H2O2) is obviously indispensable on account of its low toxicity and wide application, and it is still a challenge for developing highly sensitive and selective electrochemiluminescence (ECL) sensors based on the noble metal-free electrode. Hence, we designed an accurate ECL sensor for detecting trace H2O2 based on N-doped porous carbon containing Fe (Fe/N-C) nanocomposites, which were successfully synthesized by pyrolysis of NH2-MIL-101(Fe) metal-organic framework (MOF). Fe/N-C nanocomposite significantly improved the electron transfer process and enhanced the catalytic activity of ECL sensor for trace H2O2 detection. Fe/N-C nanocomposite significantly contributed in the conversion of H2O2 to superoxide radical, followed by the oxidation of luminal which enhanced the electrochemical luminescence signal. Predictably, the ECL sensing strategy at Fe/N-C nanocomposite electrode showed a satisfying linear range from 1 nM to 300 nM for H2O2 detection with limit of detection (LOD) as 0.93 nM (signal to noise ratio (S/N) = 3). Also, the ECL sensor was used to detect H2O2 in real water samples and renal epithelial 293T cells, which justified great promise for the practical ECL detection of H2O2.
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