CARBON
·
2021
·
IF 9.594
Qi Huang,Yuwei Xu,Yuanyuan Guo,Linjie Zhang,Yue Hu,Jinjie Qian,Shaoming Huang
To meet the increasing energy demand, the research and development of efficient and clean fuel cells and metal-air batteries are of great significance. Under these circumstances, these hierarchically porous carbon nanomaterials obtained by pyrolysis of coordination polymers are regarded as excellent oxygen reduction catalysts and are expected to be used as air cathode materials . Herein, a type of 2-dimensional structure of InOF-26 has been thermally converted into ultrathin graphitized nitrogen-doped carbon nanosheets , denoted as NG-CNS. During the carbonization , the addition of ferric chloride assists in breaking the intermolecular forces between crystal structures, which is further conducive to the formation of carbon nanosheets with an improved graphitization degree. Meanwhile, the subsequent ammonia impregnation together with secondary calcination can readjust the coordination environment of nitrogen species in the carbonaceous matrix. The obtained product of NG-CNS exhibits excellent ORR performance with a high half-wave potential of 0.80 V, a large diffusion-limited current density of 6.00 mA cm −2 , a small Tafel slope of 57.3 mV dec −1 , to show unexpected practicability in Zn-air battery and Al-air battery. The relatively simple synthetic procedure, low cost, high repeatability, and satisfactory electrochemical performance of NG-CNS will provide a direction for the facile preparation of coordination polymer-derived carbon nanomaterials in energy storage and conversion applications.
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DOI
高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 5
·e16917
·
IF 3.519
Bofeng Zhang,Yajie Tian,Dali Chen,Ling Li,Guozhu Li,Li Wang,Xiangwen Zhang,Guozhu Liu
Multimetallic nanocatalysts have attracted increasing attention for steam reforming owing to highly exposed active sites, but often suffering from severe sintering. Herein, we design subnanometric Ni-Pt bimetal clusters (ca. 1.7 nm) encapsulated in Silicalite-1 zeolite (2Ni0.5Pt@S-1) through ligand-stabilized method to prevent sintering by fixing the metal into microporous channels. In the steam reforming of n -dodecane test, 2Ni0.5Pt@S-1 gave an excellent activity and stability with a decrease of conversion only 4% at 600°C for 4 hr, which was about a quarter that of 2Ni0.5Pt/S-1 synthesized by co-impregnation method, ascribing to superior sinter-resistance of encapsulation structure. Moreover, 2Ni0.5Pt@S-1 exhibited a higher H 2 selectivity up to 69.9% than that of 2Ni0.5Pt/S-1 (64.4%), owing to suppressed methanation reaction based on subnanometric clusters. Shape-selective steam reforming of n -dodecane and ofm -xylene was also observed, because of m -xylene could hardly diffuse into the zeolite channels due to its bulky molecular size, further preventing potential deactivation by tars in reforming process.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xiaofu Tang,Guangwu Wen,Yan Song
We fabricate a novel 3D N-doped graphene/silicon composite for lithium-ion battery anodes, with Si nanoparticles uniformly dispersed and thoroughly embedded in the N-doped graphene matrix. The favorable structure of the composite results in a BET surface area and an average mesopore diameter of 189.2 m 2 g −1 and 3.82 nm, respectively. The composite delivers reversible capacities as high as 1132 mA h g −1 after 100 cycles under a current of 5 A g −1 and 1017 mA h g −1 after 200 cycles at 1 A g −1 , and exhibits an improved rate capability. The present approach shows promise for the preparation of other high-performance anode materials for lithium-ion batteries.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Minhui Zheng,Yang Liu,Qiang Ru,Jun Zhang,Zikang Pan,Yuqing Gao,Francis Chi-Chung Ling,Li Wei
The mesh-like hard carbon loaded SbPO 4 (SbPO 4 /NTC) was harvested and employed as anode material for sodium ion batteries. Profiting from prominent capacitance, porous structure, and sufficient buffering space, the composite realizes high electrochemical kinetics for sodium ion storage. The SbPO 4 /NTC composite gains impressive battery properties, such as high discharge capacity of 413.7 mAh g −1 under 0.5 A g −1 after 200 cycles and conspicuous rate performance of 365.7 mAh g −1 even at 6 A g −1 . In addition, the composite demonstrates a wide operation-temperature window with favorable capacities of 194.3–397.6 mAh g −1 from −10 °C to 60 °C at 0.1 A g −1 . The phase transition and sodium storage mechanism are elucidated by density functional theory (DFT) calculation. Therefore, the SbPO 4 /NTC composite has a great potential for high-efficient sodium ion storage.
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 6
·066514
·
IF 4.316
Xiaopeng Liu,Yan Liu,Yun Wang,Dingzhong Yuan,Jinbiao Liu,zuqing Zhu
Polyphosphazene, as a precursor, was synthesized by ultrasonication using 4,4-diaminodiphenyl ether and hexachlorocyclotriphosphazene (HCCP). It was carbonized and functionalized at high temperature to obtain carboxylic acid functionalized N, P co-doped carbon materials (denoted as NPCs-COOH). The structure of NPCs-COOH was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD), Raman spectrometry (Raman), Thermogravimetric analysis (TG) and N2 adsorption-desorption isotherm (BET). The electrosorption properties were explored under different pH values, applied potentials, initial concentrations and contact time. The optimal pH for electrosorption was 5.0 while the equilibrium time was 30 min. The maximum electrosorption capacity from the experiments towards U(VI) was about 551.46 mg g−1 under the most suitable applied potential of 0.9 V, which was much higher than other carbon materials. Meanwhile, it also showed excellent recyclability with a 23.3% reduction of electrosorption capacity after six cycles. A plausible mechanism of electrosorption was presented using XPS analysis. The results showed the N, P co-doped NPCs-COOH can be used in the electrosorption field to remove U(VI) effectively in solution.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hao Wu,Zengsheng Guo,Ming Li,Guanghui Hu,Tao Tang,Jianfeng Wen,Xinyu Li,Haifu Huang
In this work, we report a strategy for enhancing the pseudocapacitive performance of MoS 2 materials by the introduction of nitrogen-doped graphene quantum dots (N-GQDs) and helical carbon tubes (HCNT). By a simple hydrothermal process, the hybrid composite (MoS 2 , N-GQDs and HCNT) were coated on the carbon cloth (CC) without any binders, which can be directly used as advanced electrode material for high-performance solid-state flexible supercapacitors . In this hybrid structure, N-GQDs are inserted between the layers of MoS 2 nanosheets , which induce and expose more active sites for pseudocapacitance contributions in MoS 2 electrode materials. Meanwhile, HCNT acts as electrically conducting bridge for enhancing the electrical conductivity of MoS 2 nanosheets and speeding up transport of electronic. As results, the hybrid composite (MoS 2 , N-GQDs and HCNT) show higher capacitive performance than pure MoS 2 . The specific capacitance of hybrid composite is high up to 3360 mF cm −2 . Further, the assembled solid-state flexible supercapacitor shows high specific capacitance of 1893 mF cm −2 , outstanding cycle life (capacitance retention of 86% after 2500 cycles), good mechanical stability and great flexibility. Our work provides a reference for the preparation of MoS 2 composites with high supercapacitive performance.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jiangshan Gao,Yang Zhou,Zhiming Liu,Huanhuan Wang,Yan He
Herein, N-doped carbon nanotubes (CNTs) encapsulating NiCo-Se nanoparticles (NPs) are assembled to spheres (NCNTs/NiCo-Se), which are successfully synthesized by using Ni-Co prussian blue analogues (PBAs) as templates and precursors. It is rare to derive CNTs from PBAs by means of C 3 H 6 among the reported work and the structure evolution of NCNTs spheres derived from PBAs is exhibited. The high flow rate of N 2 and C 3 H 6 tend to cause short CNTs and large diameter of CNTs, respectively, owing to the dual-effect of diffusion and deposition of C atoms. Due to the advantage superposition of CNTs with high length-diameter ratio and NiCo-Se NPs, NCNTs/NiCo-Se gets excellent capabilities of charge transfer, diffusion efficiency, and electrochemical reactions. When the C 3 H 6 /N 2 is 0.2/0.3 L min −1 , the as-fabricated NCNTs/NiCo-Se deliver a substantially appreciable specific capacitance of 171.1 mAh g −1 (current density of 1 A g −1 ). The asymmetric supercapacitor (ASC) yields a maximum energy density of 55 Wh kg −1 at a power density of 801 W kg −1 . In general, this work offers an attractive route to synthesize CNTs composites from PBAs.
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 7
·077509
·
IF 3.9
Qi Wang,Wenjing Liu,Jinjin Zhang,Jianying Qu
In this work, Cu/N-C derived from MOF composites were synthesized and characterized by SEM, XRD, FTIR, XPS and EIS, which was modified on the glassy carbon electrode (GCE) to construct a novel electrochemical sensor (Cu/N-C/GCE). Due to the good electrical conductivity and abundant catalytic active sites of Cu/N-C, Cu/N-C/GCE exhibited excellent electrocatalytic performance for catechol (CC) and hydroquinone (HQ) with the oxidation peak potential difference of 112 mV. The proposed sensor could realize the simultaneous detection of CC and HQ successfully. Under optimal conditions, the redox peak currents of both CC and HQ have good linear relationship with their concentrations in the ranges of 0.50–100.00 μM and 0.50–150.00 μM with the detection limits for CC and HQ of 0.12 μM and 0.09 μM, respectively. At the same time, the sensor exhibits good stability, reproducibility and selectivity in the analysis of practical samples.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yu-lian Zhou,Qian Zhang,Yong-bo Yu,Bing-xin Wang,Jun-ming Hong
Introducing nitrogen atoms into the graphene structure is an effective way to regulate the properties of graphene materials; however, directional regulation of nitrogen species in graphene is still difficult to achieve. Herein, the nitrogen-doped graphene oxide (NGO) was prepared with an oriented design via radical precursor under different preparation processes to significantly improve operation performance in paracetamol (APAP) degradation. NGO synthesized by introducing NO 2 − radical contained abundant graphitic-N with a content of up to 79.90%, which could increase the defect degree of NGO to provide a large number of active sites, enhance the electrical conductivity, and improve the catalytic performance to degrade APAP. Moreover, the content of graphitic-N could be easily adjusted by controlling the hydrothermal treatment time and the amount of doped nitrogen. The degradation conditions were investigated, which showed that the current density of 20 mA, supporting electrolyte of sodium chloride, and initial pH of 4 were the optimal conditions. Furthermore, radical quenching experiment and electron paramagnetic resonance indicated that O 2 −, Cl , and OH active oxidants produced on the catalytic surface played a decisive role in the whole process.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiaohui Liu,Xiaofeng Li,Manli An,Yanfang Gao,Zhenzhu Cao,Jinrong Liu
Due to the unique characteristics like large specific surface area of Transition Metal Dichalcogenides (TMDs) and its well-defined hollow Metal-Organic Framework (MOF), it is widely used in dye-sensitized solar cells (DSSCs), oxygen reduction (ORR) and oxygen evolution reaction(OER). Herein, we prepare N-doped C hollow metal organic frame structure materials , which are used as a template, WS 2 nanocrystals are grown and encapsulated in MOF with interfacial W–N coupling centers. During the pyrolysis, after carbonizing, ZIF-67 becomes Co, N-doped C materials, and the growth of WS 2 is effectively suppressed, creating multi-functional groups W–N/C@Co 9 S 8 @WS 2 materials. The synthesized material is employed as a counter electrode (CE) for dye-sensitized solar cells, its high power conversion efficiency (PCE) (7.38%) based DSSC under AM 1.5G irradiation was much more than that of Pt (7.06%). Such excellent electrocatalytic performance was resulted from the unique frame pore structure , the synergistic effect of WS 2 , Co 9 S 8 and W–N multi-functional groups. Besides, W–N/C-4@Co 9 S 8 @WS 2 shows E 1/2 ≈0.84 V and a little Tafel slope of 44 mVdec −1 when employed as electrocatalysts for ORR and potential ≈ 1.79 V to achieve the current density of 10 mA cm −2 , which are lower than that of Pt/C ≈ 1.91 V catalysts in 0.1 M KOH.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Weiwei Guo,Yuting Shuai,Xuecheng Liu,Jie Zhang,Jiang Wang,Khaled H. Mahmoud,Zeinhom M. El-Bahy,N.M. Mubarak
N-butanol, a poisonous and flammable liquid, has great threat to human life and property security, which is of importance to monitor n-butanol in the environment. In this paper, the pure and Co-doped BiVO 4 polyhedrons are successfully synthesized by hydrothermal method . A series of characterizations, such as XRD , XPS, SEM, UV, and EIS, etc., are used to analyze the crystal structure, morphology, element compositions , optical and electrochemical properties of the as-prepared samples. The optimal sample (3Co-BiVO 4 ) exhibits high gas response (51.65) toward 100 ppm n-butanol, which is around four times higher than that of pure BiVO 4 at 300 °C. In addition, the 3Co-BiVO 4 also has fast response-recovery time, good humidity resistance, favorable selectivity to n-butanol, etc. Based on the above characterizations and gas sensing test results, the enhanced gas sensing mechanism for 3Co-BiVO 4 is proposed. This work provides a feasible strategy to fabricate BiVO 4 polyhedron by doping Co to greatly enhance the gas sensing properties for n-butanol.
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Zahid Nawaz,Nevin Gürbüz,Muhammad Naveed Zafar,Muhammad Nawaz Tahir,İsmail Özdemir,Ryan J. Trovitch
A mild catalytic protocol for aldehyde, amine, and alkyne coupling (A 3 -coupling) allows for the selective synthesis of propargyl amines using 5,6-dimethylbenzimidazole-derived N-heterocyclic carbene (BNHC) silver(I) catalysts. A series of BNHC Ag(Ⅰ) halide complexes were synthesized and their structures have been elucidated through the use of multinuclear NMR and FT-IR spectroscopy. Furthermore, the pseudo-linear geometry of two different compounds was substantiated by single-crystal X-ray diffraction. Silver-based A 3 -coupling was achieved for both acyclic and cyclic secondary amines using a diverse set of alkynes to afford propargyl amines with yields of up to 95 %. The present approach is environmentally benign and water is generated as the sole byproduct.
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DOI
高影响因子
危险品化学品经营许可证（带存储）