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
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tie Liu
The geometric design of atomically dispersed 'framework-active sites' grafted with carbonaceous materials to establish a well-connected three-dimensional network represents a compelling strategy for enhancing the performance of lithium-oxygen batteries, particularly in terms of cyclability. This paper introduces a simple approach that utilizes self-assembly heterogeneous nucleation to fabricate discrete bimetallic (Co, Ni) micron lattices grafted onto CNTs, exhibiting commendable surface properties. This intriguing hierarchical structure optimally harnesses the profound structural effects of CNTs weaving matrix, thereby imparting essential properties to the cathode, including high catalytic activity, intrinsically accessible active sites, and continuous porosity to accommodate discharge products. And such binary metal-nitride grafted configuration is significant in mitigating the embarrassing presence of nitrides (low conductivity) and carbon material (inferior activity). Consequently, cell measurement results indicate that a comparable capacity of 8599.7 mA h g⁻¹ and cyclic performance exceeding 200 cycles are achieved in a semi-solid state battery, outperforming commercially available RuC catalysts. And the DFT calculations further demonstrate the strong electronic coupling transfer and exceptional bifunctional activity observed in this binary metal-nitride sample. Therefore, this work exemplifies both steerable preparation techniques and the considerable potential inherent in geometric design for bimetallic sites grafted with carbonaceous material-based catalysts as they transition from Li-O 2 to Li-air batteries.
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DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 6
·1731-1737
·
IF 8.02
Mengmeng Fan,Chunlin Zhu,Lin Liu,Qilu Wu,Qingli Hao,Jiazhi Yang,Dongping Sun
We have successfully prepared poly (3,4-ethylenedioxythiophene) (PEDOT)/N-doped reduced graphene oxide (N-rGO) by electrodeposition, post-reduction, and doping N atoms with a microorganism (as a green reagent) to modify PEDOT and resolve the exfoliation and fragmentation problems of pristine PEDOT. This modification greatly improves the electrochemical properties of PEDOT, showing great potential for a bio-electrode coating material, which should have excellent electrochemical properties, stability and biocompatibility. The as-prepared PEDOT/N-rGO shows lower impedance, and higher capacitive performance and cyclical stability than pristine PEDOT due to the doping of N-rGO. An MTT assay demonstrates this modified PEDOT has good adhesion, cell viability and proliferation, similar to pristine PEDOT. This indicates that the modification process does not restrain the good biocompatibility of pristine PEDOT, which results from the doping of highly biocompatible N-rGO by this green method. The wrinkled structure, residual oxygen containing functional groups and dopant N atoms of N-rGO lead to the formation of a fluctuating surface and an increase in the hydrophilicity of PEDOT, which increase the specific surface area and cell adhesion in cell culture, respectively. Consequently, this modified PEDOT improves the electrochemical properties, and resolves the exfoliation and fragmentation problems of pristine PEDOT, while still retaining the high biocompatibility of pristine PEDOT, which is promising for a bio-electrode coating material.
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DOI
高影响因子
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
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
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
·
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
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Siyu Jin,Yuhua Xie,Hongyuan Xu,Yanping Luo,Jing Li,Weiwei Cai,Hui Xu,Hong Jin
The sluggish redox reactions and the shuttle effect associated with lithium polysulfides significantly impede the advancement of LSBs. To solve these problems, we synthesized CoS-FeS heterostructures supported by N-doped carbon nanocage (CoS-FeS@NC). The kinetic analysis shows that the enriched heterojunctions strengthens the bonding of host with polysulfides, thus promotes the redox reaction kinetics of polysulfides. XPS analysis reveals valence state of cobalt is elevated following incorporation of iron. This increase is attributed to the transfer of electrons from Co 2+ /Co 3+ to Fe 3+ . The configuration of the cationic valence electrons drives this electron transfer, which in turn improves the catalytic efficiency of the CoS-FeS@NC composites. Leveraging these advantages, the S@CoS-FeS/NC cathode demonstrates an exceptional ability to adsorb lithium polysulfides (LiPSs), along with rapid reaction kinetics and enduring stability in cycling (reversible capacity of 638 mAh g −1 at 0.2 C after 200 cycles). Remarkably, even when subjected to a charge/discharge rate as high as 1 C, the cathode sustains a capacity of 619 mAh g −1 and it keeps 542 mAh g −1 at 1 C after 1000 cycles at a degradation rate of merely 0.05 % for each cycle. This offers a feasible strategy to thoughtfully fabricate bimetallic sulfide heterostructures and fosters advancements in various electrochemical energy storage and conversion applications.
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DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 33
·期 6
·065409
·
IF 3.874
Wenwen Zhang,Ximeng Zhao,Weixing Niu,Hang Yu,Tongtao Wan,Guihua Liu,Dongsheng Zhang,Yanji Wang
The slow kinetic of oxygen reduction reaction (ORR) hampers the practical application of energy conversion devices, such as fuel cells, metal-air batteries. Here, an efficient ORR electrocatalyst consists of Co, Ni co-decorated nitrogen-doped double shell hollow carbon cage (Ni–Co@NHC) was fabricated by pyrolyzing Ni-doped polydopamine wrapped ZIF-67. During the preparation, polydopamine served as a protective layer can effectively prevent the aggregation of Co and Ni nanoparticles during the pyrolysis process, and at the same time forming a carbon layer to grow a double layer carbon cage. This unique hollow structure endows the catalyst with a high specific surface area as well as more exposed active sites. Also benefited from the synergistic effect between Ni and Co nanoparticles, the Ni–Co@NHC catalyst leads to an outstanding ORR performance of half-wave potential (E1/2, 0.862 V), outperforms that of commercial Pt/C catalyst. Additionally, when Ni–Co@NHC was used in the cathode for the zinc-air battery, the cell exhibits high power density (108 mW cm−2) and high specific capacity (806 mAh g−1) at 20 mA cm−2 outperforming Pt/C. This work offers a promising design strategy for the development of high-performance ORR electrocatalysts.
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DOI
高影响因子
JACS Au
·
2024
·
IF 8.5
Xixi Liu,Liang Huang,Yurong He,Peng Zhou,Xuedan Song,Zehui Zhang
It remains challenging to construct C═N bonds due to their facile hydrogenation. Herein, a single Co atom catalyst was discovered to be active for the selective construction of C═N bonds toward the synthesis of imines and N-heterocycles via reductive coupling of nitroarenes with various alcohols, including inert aliphatic ones. DFT calculations and experimental data revealed that the transfer hydrogenation proceeded via the intramolecular hydride transfer and the transfer of H from the α-Csp3-H bond to the nitro group was the rate-determining step. The single Co atoms served as a bridge to transfer the electrons from the catalyst to the adsorbed alcohol molecules, resulting in the activation of the α-Csp3-H bond. Unlike metal nanoparticles, the C═N bonds in imine products can be reserved due to the large steric hindrance from substituents on C and N. DFT calculation also confirmed that transfer hydrogenation of the C═N bonds in imines is thermodynamically unfavored with a much higher energy barrier compared with the transfer hydrogenation of the –NO2 group (1.47 vs 1.15 eV).
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DOI
PubMed
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
危险品化学品经营许可证（带存储）