Small
·
2022
·Vol. 18
·期 39
·2203459
·
IF 15.153
Qing Sun,Maoxiang Yang,Guifang Zeng,Jing Li,Zhibiao Hu,Deping Li,Shang Wang,Pengchao Si,Yanhong Tian,Lijie Ci
Tin chalcogenides are regarded as promising anode materials for potassium ion batteries (PIBs) due to their considerable specific capacity. However, the severe volume effect, limited electronic conductivity, and the shuttle effect of the potassiation product restrict the application prospect. Herein, based on the metal evaporation reaction, a facile structural engineering strategy for yolk–shell SnSe encapsulated in carbon shell (SnSe@C) is proposed. The internal void can accommodate the volume change of the SnSe core and the carbon shell can enhance the electronic conductivity. Combining qualitative and quantitative electrochemical analyses, the distinguished electrochemical performance of SnSe@C anode is attributed to the contribution of enhanced capacitive behavior. Additionally, first-principles calculations elucidate that the heteroatomic doped carbon exhibits a preferable affinity toward potassium ions and the potassiation product K 2 Se, boosting the rate performance and capacity retention consequently. Furthermore, the phase evolution of SnSe@C electrode during the potassiation/depotassiation process is clarified by in situ X-ray diffraction characterization, and the crystal transition from the SnSe Pnma(62) to Cmcm(63) point group is discovered unpredictably. This work demonstrates a pragmatic avenue to tailor the SnSe@C anode via a facile structural engineering strategy and chemical regulation, providing substantial clarification for the phase evolution mechanism of SnSe-based anode for PIBs.
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ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200075
·
IF 9.14
Jun Zheng,Chenyang Zhan,Kai Zhang,Wenwu Fu,Qiaojun Nie,Ming Zhang,Zhongrong Shen
Graphical Cellmates : A zinc-ion battery cell is constructed with V 2 O 3 @C as the cathode and a “water-in-salt” electrolyte. Electrochemically induced oxidation of V 2 O 3 @C into amorphous V 2 O 5 with in situ Zn 2+ and H 2 O co-insertion leads to excellent cycling and rate performances. Systematic improvement of this architecture indicates significant promise for practical application. Aqueous Zn-ion batteries (ZIBs), with the advantages of low cost, high safety, and high capacity, have great potential for application in grid energy storage and wearable flexible devices. However, their commercial application is still restricted by their inferior long-term cycling stability, Zn dendrite formation, and the decomposition of aqueous electrolyte. In this study, a Zn|Zn(CF 3 SO 3 ) 2 +LiTFSI|V 2 O 3 @C cell is constructed to address the above issues. The V 2 O 3 @C electrode can be fully oxidized into amorphous V 2 O 5 @C simultaneously with Zn 2+ and H 2 O co-insertion. The cell delivers a high specific capacity of more than 240 mAh g −1 at 3 A g −1 , with extraordinary coulombic efficiency and capacity retention. The excellent electrochemical performances are attributed to synergistic effects between the V 2 O 3 @C electrode and the water-in-salt electrolyte with enhanced stability and improved interface reaction kinetics. Systematic improvements of this architecture indicate much promise for application.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 15
·9675-9684
·
IF 12.732
Fei Li,Yi-Lin Liu,Gui-Gen Wang,Dong Yan,Gui-Zhong Li,Hai-Xu Zhao,Hua-Yu Zhang,Hui-Ying Yang
With the increased development of wearable electronics, flexible zinc ion batteries (ZIBs) have attracted widespread attention owing to their low cost, superior safety, and simple fabrication process. Nevertheless, the limited active mass loading and low specific capacity remain challenges to be overcome. Herein, an effective in situ growth strategy is used to boost the mass loading and specific capacity of flexible ZIBs. We employed a mussel-derived polydopamine layer as an inductive catalyst to prompt the growth of flower-like δ-MnO2 on carbon cloth, which demonstrated strong adhesion to the surface, high mass loading, and excellent flexibility. In addition, the formed 3D conductive and supporting networks contribute to the realization of superior long cycle life, as well as a high specific capacity. As a result, the as-obtained flexible cathode can achieve a high initial discharge capacity of 1.3 mA h cm−2 at a current density of 1 mA cm−2 and a reversible capacity of 0.25 mA h cm−2 at 10 mA cm−2 for 10 000 cycles. Moreover, its reaction mechanism in ZIBs was analyzed via a series of ex situ characterization techniques, and the results suggest that the charge–discharge behavior is determined based on the Zn2+ (de-)intercalation in the δ-MnO2 interlayer. Remarkably, the as-developed flexible cathode is assembled into a flexible quasi-solid-state device, which shows excellent flexibility and can easily power one LED-based device, which has significant application prospects in wearable electronics. This work provides a novel tactic for the design of flexible batteries with high active mass loading and excellent electrochemical performance via employing polydopamine as an inductive catalyst.
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JOURNAL OF CHEMICAL SCIENCES
·
2024
·Vol. 136
·期 3
·1-11
·
IF 1.7
Zhao Zhicai
A series of 1-carbonyl-1 H -indoles were prepared by 2-iodoanilines and calcium carbide in a one-pot reaction catalyzed by recyclable10% Pb/C, resulting in the corresponding substituted indoles in good yields. This protocol offers several advantages, including the utilization of sustainable, low-cost calcium carbide, an easy-to-handle acetylene source, and recyclable Pb/C catalysts. Graphic abstract The synthesis of a series of 1-carbonyl-1 H -indoles were prepared by 2-iodoanilines and calcium carbide in a one-pot reaction catalyzed by 10% Pb/C, resulting in the corresponding substituted indoles in good yields. This protocol offers several advantages, including the utilization of sustainable, low-cost feedstock, an easy-to-handle acetylene source, and recyclable Pb/C catalysts.
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高影响因子
ACS Omega
·
2021
·
IF 3.512
Xianyu Liu,Tayyaba Najam,Ghulam Yasin,Mohan Kumar,Miao Wang
Herein, we successfully synthesized two novel metal thiophosphites (MTPs) hybridized with carbon, that is, NiPS3/C and SnPS3/C composites, via an environment-friendly and cost-effective approach without harsh reaction conditions. Subsequently, the electrochemical performances of NiPS3/C and SnPS3/C composites have been investigated in coin-cells, and it is revealed that MTPs/C have a significantly higher Li-storage capacity and better stability compared to the MTPs without carbon. Moreover, the SnPS3/C electrode shows a lower internal resistance and a better rate performance compared to NiPS3/C. We employed extensive ex situ experiments to characterize the materials and interpreted the remarkably improved performance of MTPs/C.
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高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Hong Li,Qiulan Li,Qiao Shi,Yijie Wang,Xiuwei Liu,Hao Tian,Xinrui Wang,Dezhi Yang,Yaling Yang
Single-atom nanozymes (SAzymes) show distinct advantages in catalytic activity and selectivity owing to their stability and special characteristic of maximum atomic utilization. Inspired by the structure of natural horseradish peroxidase (HRP), we developed a simple method for specific determination of both propyl gallate (PG) and formaldehyde (HCHO) by utilizing the intrinsic peroxidase mimics activity of hemin (hem) loaded Zn–nitrogen–carbon single-atom nanozymes (Zn–N–C@hem SAzymes). Zn–N–C@hem was prepared via a salt-template strategy and self-assembly, where hemin exhibits enhancing peroxidase-like activity can catalyze oxidation of colorless PG to yellow product. Upon introduction of HCHO into Zn–N–C@hem/PG system, complete suppression of PG oxidation was showed, resulting in distinguished decrease in absorbance. The colorimetric sensors of PG and HCHO based on Zn–N–C@hem/PG were developed at their respective linear range of concentration 1.25–200 mg/kg and 5–250 mg/kg. The practicability of the rapid analysis of PG and HCHO in food samples has been verified with reliable results.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xin Ren,Zhenfei Li,Jingrui Cao,Shiyu Tian,Kaicheng Zhang,Jianling Guo,Lizhi Wen,Guangchuan Liang
Mortar-like LiFePO 4 /C composites are synthesized by a ball milling-spray drying-carbothermal reduction method using polyethylene glycol (PEG) as the organic carbon source, dispersant , and reductive agent, while the carbon aerogel as the excellent conductive network. PEG enables the carbon aerogel to uniformly coat the primary particles, which restricts the overgrowth of primary particles' during the synthesis process. While the carbon aerogel provides a three-dimensional conductive network, and its porous structure can absorb more electrolyte. Moreover, the mortar-like secondary particles could further increase the specific surface of LiFePO 4 /C composites. The high speed of electron transfer and lithium-ion transportation can be achieved simultaneously for the Mortar-like LiFePO 4 /C composites. All these factors contribute to the outstanding rate performance (163.4 mAh g -1 at 0.2 C and 115.4 mAh g -1 at 15 C) and considerable cycling stability (99.3% of capacity retention after 300 cycles at 5 C/5 C). The Mortar-like LiFePO4/C composites combined with the evenly coated carbon aerogel are promising cathode materials for rechargeable lithium-ion power batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 25
·11524-11534
·
IF 3.553
Han Qigang,Zhang Wenqiang,Geng Di,Li Yao,Zhang Xu,Han Zhiwu
A tin dioxide/carbon composite (SnO 2 @C) with controlled shape is fabricated using a two-step method, which includes preparation of SnC 2 O 4 precursors and subsequent heat treatment process. SnC 2 O 4 precursors with different morphologies are synthesized by controlling the different proportions of tin sources, and some characterization techniques are carried out to screen out the optimum precursors. And the precursors are further annealed to obtain nanostructured SnO 2 and coated with carbon film. Ultimately, shape-controlled SnO 2 @C anode materials are prepared, and the reaction process and electrochemical properties of SnO 2 @C composites as anode materials are further studied. The SnO 2 @C composite shows the capacity of 659.4 mAh g −1 after 100 cycles at a current density of 100 mA g −1 . Even at the rate of 2000 mA g −1 , the composite electrode can maintain a reversible capacity of 507.2 mAh g −1 . The excellent electrochemical performance is beneficial to the synergistic effect between the carbon coating film and the nanostructured SnO 2 , which provides sufficient lithium storage sites, good electronic conductivity and void space to relieve the volume expansion.
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高影响因子
ELECTROANALYSIS
·
2023
·Vol. 36
·期 4
·e202300371
·
IF 3
Wenjing Liu,Sumin Xu,Jinjin Zhang,Qi Wang,Jianying Qu
In this work, manganese-based metal-organic frameworks (MnBDC) were synthesized by solvothermal method and physically mixed with pre-prepared graphene oxide (GO) to obtain GO/MnBDC, which were calcined to give MnO@C composite coated with reduced graphene oxide (rGO) marked as rGO/MnO@C. The materials were characterized by SEM, XRD, FTIR and XPS. Based on this composite, a novel sensor was constructed on a glassy carbon substrate, which exhibited good electrocatalytic activities to the redox reactions of catechol (CC) and hydroquinone (HQ), enabling simultaneous detection of both analytes. Under optimized conditions, the electrochemical sensor demonstrated a linear range of 0.50–90.00 μM for both CC and HQ detection, with respective detection limits of 0.05 μM and 0.03 μM. Moreover, the sensor exhibited excellent sensitivity, selectivity and accuracy for detecting CC and HQ simultaneous in real samples.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 3
·2159-2163
·
IF 1.774
Wang Yan,Wang Yishu,Ma Limin,Han Jing,Guo Fu
Because of its tetragonal structure, β -Sn exhibits anisotropy in electromigration behavior. The diffusivity of Cu atoms along the c -axis of Sn is much faster than that along the a -axis; therefore, the orientation of the c -axis exerts a strong influence on Cu atomic motion. In this work, the effect of Sn grain c -axis on Cu atomic motion was investigated by using Cu reinforced Sn3.5Ag composite solder joints. The microstructure and morphology of the solder joints were characterized by scanning electron microscopy (SEM) equipped with a backscattered electron (BSE) detector. It was found that intermetallic compounds (IMCs) in the solder matrix were formed due to the migration of Cu atoms to the surface of the solder joint under current stressing. There was a large amount of IMCs on the solder matrix which protruded from the solder matrix. By changing the direction of electron flow, i.e. changing the anode and the cathode side, the IMCs which formed after current stressing in the solder matrix disappeared and the protruding Sn remained unchanged. The results revealed that the growth of IMCs was closely related to the migration of Cu atoms, while Cu atomic motion depended on the orientation of the Sn grain c -axis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zewen Yang,Dandan Jia,Yue Wu,Depeng Song,Xiaolin Sun,Cheng Wang,Li Yang,Yuan Zhang,Jing Gao,Takeo Ohsaka,Futoshi Matsumoto,Jianfei Wu,Qiang Shen
Lithium-sulfur (Li-S) batteries exhibit a high specific capacity (1675 mAh g −1 ) but poor S conductivity and severe shuttle effects. Selenium (Se) can greatly mitigate these disadvantages, but its theoretical capacity is relatively low (675 mAh g −1 ). A series of S x -Se y compounds supported by chitosan-derived carbon with intertwined carbon nanotube (CC + CNT) carriers exhibit the high capacity of S, the stability of Se, and the excellent conductivity of C, complementing their individual defects. S 2 Se 1 /CC + CNT shows the best electrochemical performance (833.2 mAh g −1 after 500 cycles). Characterization results reveal the structure–activity relationships and complex reaction mechanisms of the prepared electrode materials. The overall reactions are a combination of basic Li-S and Li-Se reactions. The discharge steps are clearly identifiable, while the reaction sequences are slightly adjusted and fully integrated when charging. This work provides a foundation for future research and for the practical application of chalcogenides in lithium-metal batteries.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2023
·Vol. 29
·期 6
·453-461
·
IF 7.1
Qiu Wenhao,Han Qing,Yu Xiaogang,Xiang Zhonghua
Developing nonprecious metal-nitrogen-doped carbon (M–N–C) catalysts with high activity and stability is critical to their widespread use in fuel cells; however, these catalysts still face considerable challenges. Herein, a novel iron atom-cluster strategy for the synthesis of iron-based N–C catalyst comprising Fe nanoparticles (Fe NPs) surrounded by Fe-N x sites is developed for oxygen reduction reactions in an acidic fuel cell. Iron oxide NPs were incorporated into zeolitic imidazolate framework-8 (ZIF-8)-derived carbon materials and pyrolyzed at high temperatures using NaCl as a modifier to produce Fe NPs and Fe-N x composite active sites. The half-wave potential of the optimized Fe NP /FeNC-NaCl material was substantially improved to 0.81 V. Furthermore, even after 15,000 cycles, the half-wave potential of the catalyst remained essentially unchanged. As a cathode catalyst for fuel cells, it realized a high peak power density of 436 mW/cm 2 under a practical H 2 -air atmosphere. Therefore, this study presents a new approach for designing and synthesizing electrocatalytic materials with high catalytic activity and stability.
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