CARBON
·
2021
·
IF 9.594
Na Yang,Rong Shao,Zhengping Zhang,Meiling Dou,Jin Niu,Feng Wang
Gelatin, a natural macromolecular substance formed by the hydrolysis of collagen, offers the advantages of abundant resources and low cost. It is a good precursor for the synthesis of N, O-doped carbon materials. Although some gelatin-derived carbon materials have been used for electrochemical energy storage , there have been few studies for the mechanism of gelatin carbonization . In addition, the influence of heteroatoms and defects on the K-ion storage performance remains unclear. In this work, in situ and ex situ characterization methods have been used to study the mechanism of gelatin carbonization. The pathways leading to formation of the carbon framework, heteroatom doping and defect generation in gelatin-based carbons during the pyrolysis process have been clearly identified. Moreover, by means of DFT calculations and experimental measurements, it has been confirmed that heteroatoms and defects both play important roles in improving the storage performance of potassium ions. By virtue of its abundance of both heteroatoms and defects, our optimized anode shows better electrochemical performance than graphite anodes. This study not only clarifies our understanding of carbonization mechanism and mechanism of K-ion storage in carbon materials, but also provides pathways for the synthesis and applications of new carbon-based anode materials for alkali-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 25
·12705-12715
·
IF 11.301
Xinming Wu,Han Wang,Zhilin Zhao,Bin Huang
Although potassium-ion batteries have been widely studied because of their low cost and high theoretical capacity, the origin of the poor potassium-ion storage kinetics and low structural stability still remains elusive mainly due to the large size of K+ (0.138 nm). Herein, we report an interstratification-assembly strategy via van der Waals interactions to design a novel BPE@V2CTx hybrid anode, wherein black phosphorene (BPE) and V2CTx MXene are derived from their individual 2D nanosheets. The coupled BPE@V2CTx hybrid anode with a 2D stacked interstratification structure and large specific surface area could efficiently take advantage of BPE and V2CTx nanosheets and create more active sites. This interstratification hybrid electrode not only provides an enlarged interlayer spacing and a three-dimensional interconnected conductive network to accelerate the K+ transport rates, but also has good tolerance to volume changes caused by phase transformations during the fast potassiation/depotassiation process. DFT calculations further confirm that potassium affinities and diffusion kinetics are significantly enhanced in the BPE@V2CTx hybrid anode, particularly in BPE@V2CF2. As a result, the hybrid anode possesses a remarkable synergetic effect and achieves a high reversible capacity of 593.6 mA h g−1 at 0.1 A g−1 and excellent cycling stability of 485/261 mA h g−1 with 91/86% capacity retention after 3000 cycles at 0.2/2.0 A g−1. This work opens a new way for the application of self-assembled hybrid electrodes in energy storage, electrocatalysis and sensors.
研究领域:
材料科学
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能源存储
·
计算化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Ling Kang,Shude Liu,Qia Zhang,Jianxiong Zou,Jin Ai,Donghong Qiao,Wenda Zhong,Yuxiang Liu,Seong Chan Jun,Yusuke Yamauchi,Jian Zhang
Molybdenum sulfide (MoS2) is a promising electrode material for supercapacitors; however, its limited Mo/S edge sites and intrinsic inert basal plane give rise to sluggish active electronic states, thus constraining its electrochemical performance. Here we propose a hierarchical confinement strategy to develop ethylene molecule (EG)-intercalated Co-doped sulfur-deficient MoS2 (Co-EG/SV-MoS2) for efficient and durable K-ion storage. Theoretical analyses suggest that the intercalation-confined EG and lattice-confined Co can enhance the interfacial K-ion storage capacity while reducing the K-ion diffusion barrier. Experimentally, the intercalated EG molecules with mildly reducing properties induced the creation of sulfur vacancies, expanded the interlayer spacing, regulated the 2H–1T phase transition, and strengthened the structural grafting between layers, thereby facilitating ion diffusion and ensuring structural durability. Moreover, the Co dopants occupying the initial Mo sites initiated charge transfer, thus activating the basal plane. Consequently, the optimized Co-EG/SV-MoS2 electrode exhibited a substantially improved electrochemical performance. Flexible supercapacitors assembled with Co-EG/SV-MoS2 delivered a notable areal energy density of 0.51 mW h cm–2 at 0.84 mW cm–2 with good flexibility. Furthermore, supercapacitor devices were integrated with a strain sensor to create a self-powered system capable of real-time detection of human joint motion.
研究领域:
材料科学
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能源存储
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 29
·1801989
·
IF 13.325
Lei Liu,Yu Chen,Yihao Xie,Peng Tao,Qinyi Li,Chenglin Yan
Carbon-based materials are considered to be one of the most promising materials for negative electrodes of the future, because of their good chemical stability, high electrical conductivity, and environmental benignity. However, to date, the underlying principles of K-ion storage in carbonaceous anodes remain elusive, which greatly hinders the development of such a category of anodes. Herein, the ultrastable K-ion storage of carbonaceous anode through systematic analyses, including comprehensive electrochemical characterizations, kinetics calculations, and structural/compositional evolution mechanism studies, is theoretically elucidated and experimentally verified. Specifically, it is found that the uniquely envelope-like nitrogen-doped carbon nanosheets with high pseudocapacitive could bring ultrastable storage of potassium ions, delivering a high initial reversible capacity of 367 mAh g −1 at a current density of 50 mA g −1 and retain 70.5 and 75.6% at current densities of 500 and 1000 mA g −1 after 1000th cycle, respectively. This study could enlighten researchers on further progress in the field of carbonaceous K-ion battery negative electrode with a long cycle life.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Chunhui Wang,Keyi Xian,Shuangshuang Zhao,Shuailing Ma,Haozhe Qin,Dong Wang,Akhil Tayal,Yanfei Wang,Ying-Wu Lin,Ming Feng,Xing Ou
Interfacial engineering , especially atomic substitution at the interface or inside the nanomaterials , is a promising strategy for fabricating high-performance electrode materials. Herein, an interfacial modification strategy was reported to develop cobaltous sulfide (CoS 2 ) nanomaterials with Fe clusters modified on their interface and Fe single atoms partially substituted Co atoms in CoS 2 (Fe-CFS), which were further wrapped by graphene networks, forming highly active Fe-CFS@graphene nanomaterials (Fe-CFS@C) with triple reaction interfaces . As the 1st interface, graphene can decrease their electrical resistance. At the 2nd interface, partial substitution of Co atoms in CoS 2 by Fe single atoms can reduce its band gap and boost the potassium ion (K + ) diffusion rate. At the 3rd interface, anchoring Fe clusters on the surface of CoS 2 results in the formation of Schottky junction and promotes the formation of built-in electric fields, which accelerates the K + insertion/extraction kinetics and depresses the dynamic polarization. Acting as anode for K + battery , Fe-CFS@C exhibits a high reversible capacity of 755.8 mA h g −1 at 0.05 A g −1 . Even at 10 A g −1 , it can maintain 178.3 mA h g −1 over 4000 cycles due to the greatly enhanced electrochemical reaction kinetics and effectively improved structural stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 15
·2211311
·
IF 29.4
Dawei Sha,Yurong You,Rongxiang Hu,Xin Cao,Yicheng Wei,Heng Zhang,Long Pan,ZhengMing Sun
Anion vacancy engineering (AVE) is widely used to improve the Li-ion and Na-ion storage of conversion-type anode materials. However, AVE is still an emerging strategy in K-ion batteries, which are promising for large-scale energy storage. In addition, the role of anion vacancies on ion storage is far from clear, despite several proposed explanations. Herein, by employing VSe 2 as a model conversion-type anode material, Se vacancies are intentionally introduced (labeled as P-VSe 2− x ) to investigate their effect on K + storage. The P-VSe 2− x shows excellent cyclability in half cells (143 mA h g −1 at 3.0 A g −1 after 1000 cycles) and high energy density in coin-type full cells (206.8 Wh kg −1 ). By applying various electrochemical techniques, the effects of Se vacancies on the redox potentials of K-ion insertion/extraction and the K-ion diffusion in electrodes upon cycling are uncovered. In addition, the structural evolution of Se vacancies during potassiation/de-potassiation using various operando and ex characterizations is revealed. Moreover, it is demonstrated that Se vacancies can facilitate the breaking of V Se bonds upon the P-VSe 2− x conversion using theoretical calculations. This work comprehensively explains the role of anion vacancies in ion storage for developing high-performance conversion-type anode materials.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Kai-Yang Zhang,Han-Hao Liu,Meng-Yuan Su,Jia-Lin Yang,Xiao-Tong Wang,Edison Huixiang Ang,Zhen-Yi Gu,Shuo-Hang Zheng,Yong-Li Heng,Hao-Jie Liang,Yinglin Wang,Shuying Li,Xing-Long Wu
Expanded graphite (EG) stands out as a promising material for the negative electrode in potassium-ion batteries. However, its full potential is hindered by the limited diffusion pathway and storage sites for potassium ions, restricting the improvement of its electrochemical performance. To overcome this challenge, defect engineering emerges as a highly effective strategy to enhance the adsorption and reaction kinetics of potassium ions on electrode materials. This study delves into the specific effectiveness of defects in facilitating potassium storage, exploring the impact of defect-rich structures on dynamic processes. Employing ball milling, we introduce surface defects in EG, uncovering unique effects on its electrochemical behavior. These defects exhibit a remarkable ability to adsorb a significant quantity of potassium ions, facilitating the subsequent intercalation of potassium ions into the graphite structure. Consequently, this process leads to a higher potassium voltage. Furthermore, the generation of a diluted stage compound is more pronounced under high voltage conditions, promoting the progression of multiple stage reactions. Consequently, the EG sample post-ball milling demonstrates a notable capacity of 286.2 mAh g -1 at a current density of 25 mA g −1 , showcasing an outstanding rate capability that surpasses that of pristine EG. This research not only highlights the efficacy of defect engineering in carbon materials but also provides unique insights into the specific manifestations of defects on dynamic processes, contributing to the advancement of potassium-ion battery technology.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2021
·
IF 9.594
Xiang Gao,Wei Liu,Tianqi Wang,Jingrou Dai,Yuanyuan Pan,Yongxu Du,Yongpeng Cui,Hongguang Fan,Shuang Liu,Yongcheng Jin
N-doping can endow carbon materials with high electrochemical activity. Besides the widely validated sp 2 -hybridized nitrogen doping, sp -hybridized nitrogen ( sp - N ) atoms are also expected to be new active sites. However, both sp - N atoms and cyano (CN) groups containing sp - N are rarely produced in carbon materials presently. In this work, the first cyano groups-modified carbon materials are synthesized firstly via an interesting struggle between the chemical etching of KOH and the catalytic graphitization of Co nanoparticles in carbon frameworks. The theoretical calculations and experimental results manifest that the stronger electronegativity of CN groups renders carbon materials a higher electrochemical activity. As K + storage anodes, the CN − modified carbon materials exhibit an obvious boost in potassium storage performance in both ester- and ether-based electrolytes. Therefore, as a new N doping form, the successful introduction of CN groups into carbon materials opens a door for exploring sp -N doped carbon materials for applications in energy storage and other fields.
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 3
·2083-2091
·
IF 8.897
Wen Sheng,Gu Xin,Ding Xiangwei,Zhang Li,Dai Pengcheng,Li Liangjun,Liu Dandan,Zhang Wenchao,Zhao Xuebo,Guo Zaiping
Conversion/alloying anode materials exhibiting high K storage capacities suffer from large volume variations and unstable electrode/electrolyte interfaces upon cycling. Herein, taking SnS/reduced graphene oxide (SnS/rGO) anodes as an example, the electrochemical performance of SnS/rGO could significantly be improved via employing potassium bis(fluorosulfonyl)imide (KFSI) salt in electrolytes and ultrathin TiO 2 coating. KF-rich inorganic layer was demonstrated to help form robust SEI layer, which could suppress the side reactions to increase the Coulombic efficiency. The formed potassiated K x TiO 2 coating layer was constructed to boost charge transfer capability and K-ion diffusion kinetics. The as-prepared SnS/rGO@TiO 2 -20 electrode in KFSI electrolyte delivers the high CE of 99.1% and 424 mAh·g −1 after 200 cycles with an ultrahigh capacity retention of 98.5%.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 43
·22874-22885
·
IF 11.301
Yamin Zhang,Zhongpu Wang,Deping Li,Qing Sun,Kangrong Lai,Kaikai Li,Qunhui Yuan,Xingjun Liu,Lijie Ci
Porous carbon has attracted extensive attention as an electrode material for various energy storage devices considering its advantages such as high theoretical capacitance/capacity, high conductivity, low cost and earth abundance. However, there still exist limitations hindering its practical applications, such as the tedious fabrication process, limited metal-ion transport kinetics and undesired structural deformation under harsh electrochemical conditions. Herein, we report a facile strategy, with calcium gluconate as the carbon source, to fabricate ultrathin porous carbon nanosheets. The as-prepared Ca-900 electrode delivers excellent K-ion storage performance including high reversible capacity (413.7 mA h g−1), superior rate capability (161.8 mA h g−1 at an ultrahigh current density of 5.0 A g−1) and ultra-stable long-term cycling stability (a high capacity retention ratio of ∼75.0% after 5500 cycles at 5.0 A g−1). Similarly, when being applied in Zn-ion hybrid capacitors, the Ca-900 electrode exhibits a high energy density of 75.22 W h kg−1, illustrating the application potential. Moreover, the origin of the fast and smooth metal-ion storage is also revealed by carefully designed consecutive CV measurements. Both K-ion/Zn-ion storage mechanisms are preliminarily revealed through ex situ measurements. Overall, considering the facile preparation strategy, unique structure, application flexibility and in-depth mechanistic investigations, it can be seen that this work will deepen the fundamental understanding of potassium-ion batteries and serve as a reference for the development of porous carbon materials for other highly efficient energy storage devices.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2023
·
IF 20.5
Kaijun Xie,Xin Liu,Haolin Li,Long Fang,Kai Xia,Dongjiang Yang,Yihui Zou,Xiaodong Zhang
The incorporation of heteroatoms into carbon aerogels (CAs) can lead to structural distortions and changes in active sites due to their smaller size and electronegativity compared to pure carbon. However, the evolution of the electronic structure from single-atom doping to heteroatom codoping in CAs has not yet been thoroughly investigated, and the impact of codoping on potassium ion (K + ) storage and diffusion pathways as electrode material remains unclear. In this study, experimental and theoretical simulations were conducted to demonstrate that heteroatom codoping, composed of multiple heteroatoms (O/N/B) with different properties, has the potential to improve the electrical properties and stability of CAs compared to single-atom doping. Electronic states near the Fermi level have revealed that doping with O/N/B generates a greater number of active centers on adjacent carbon atoms than doping with O and O/N atoms. As a result of synergy with enhanced wetting ability (contact angle of 9.26°) derived from amino groups and hierarchical porous structure, ON-CA has the most optimized adsorption capacity (−1.62 eV) and diffusion barrier (0.12 eV) of K + . The optimal pathway of K + in ON-CA is along the carbon ring with N or O doping. As K + storage material for supercapacitors and ion batteries, it shows an outstanding specific capacity and capacitance, electrochemical stability, and rate performance. Especially, the assembled symmetrical K + supercapacitor demonstrates an energy density of 51.8 Wh kg −1 , an ultrahigh power density of 443 W kg −1 , and outstanding cycling stability (maintaining 83.3% after 10,000 cycles in 1 M KPF 6 organic electrolyte). This research provides valuable insights into the design of high-performance potassium ion storage materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 2
·394-401
·
IF 5.934
Yushan Luo,Mengli Tao,Jianhua Deng,Renming Zhan,Bingshu Guo,Qianru Ma,Muhammad Kashif Aslam,Yuruo Qi,Maowen Xu
K-ion batteries (KIBs) are considered as one of the most promising devices for large-scale energy storage because of the comparable output voltage with lithium-ion batteries and the abundant reserves of potassium. FeS2 is regarded as a kind of very important anode material for KIBs due to its low cost and high capacity. However, the poor electronic conductivity and huge volume expansion of FeS2 during the discharge/charge process strongly inhibit the K-storage performance. To solve these problems, herein, unique core–shell FeS2@C nanocubes with nanoparticles in the interior and carbon shells in the exterior are designed. The inside FeS2 nanoparticles are beneficial for K+ diffusion and the penetration of the electrolyte, while the outside carbon shells can enhance the electronic conductivity and suppress the volume expansion. The unique core–shell structure displays outstanding K-storage performance with impressive specific capacity, excellent cycling stability, and superior rate capability with 73% capacity retention at 2 A g−1. This work not only provides solutions to obtain a superior anode material for KIBs but also offers insights into designing a hierarchical structure for energy storage systems.
研究领域:
材料科学
·
能源化学
·
纳米技术
·
电化学储能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）