Energy & Environmental Science
·
2024
·Vol. 17
·期 14
·5147-5161
·
IF 32.4
Qingfeng Fu,Wang Zhou,Peng Gao,Hongliang Dong,Shi Chen,Changling Fan,Jilei Liu
Fluorophosphate compounds are an important class of cathode materials; however, the one-step synthesis of phase-pure fluorophosphate compounds in a well-controlled manner remains challenging owing to the facile volatilization of fluorine during heat treatment. Herein, the rapid, facile, and scalable preparation of phase-pure fluorophosphates (e.g. KVPO4F) was successfully realized via a one-step solid-state reaction through the addition of PVDF, which served as an effective fluorine-compensating, vanadium-reducing, and in situ carbon-coating agent. In-depth mechanistic study showed that carbene (:CH2) generated upon PVDF decomposition could be easily recombined to form a ˙CH2(CH2)nCH2˙ alkyl biradical, and both were able to catalyze C–F bond breakage in fluorocarbon gases (C2F4) and therefore plays a pivotal role in promoting the formation of phase-pure fluorophosphate. The resultant cathode enabled a superior potassium-storage capability, including high specific capacity, excellent rate capability, and good cycling stability. The generality of the as-proposed synthetic strategy was also validated through the successful preparation of other fluorophosphate compounds.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fei Yuan,Ziyu Wu,Sijia Zhang,Zhaojin Li,Qiujun Wang,Huilan Sun,Di Zhang,Wei Wang,Bo Wang
Coupling sites of nitrogen-dopants and intrinsic carbon defects (N/DC) are highly attractive to improve potassium-storage capacity and cycling stability, yet it is hard to effectively construct them. Herein, a novel strategy is proposed to establish abundant N/DC sites in N -doped carbon (ZIF8/NaBr-1-900) by pyrolyzing the mixture of metal–organic framework (ZIF8)/sodium bromide (NaBr). Systematic investigations disclose that the introduced NaBr can promote the full conversion of Zn-N 4 moieties into zinc oxide (ZnO) via a “bait and switch” mechanism. Such formed endogenous ZnO can etch the carbon matrix of the confined domains around the N dopants during pyrolysis process, and meanwhile the released N -atoms from Zn-N 4 moieties can largely form edge-N. As such, these N/DC coupling sites enable the resultant carbon to have a more significant capacitive behavior related to fast K-ion migration and high structural stability, leading to 255.3 mAh/g at 2 A/g with a prolonged cycle lifespan over 2000 cycles. Moreover, the assembled K-full battery presents a high energy density of 171.2 Wh kg −1 and excellent cyclability over 5000 cycles. This NaBr-mediated endogenous ZnO domain-confined etching strategy provides a new insight into the exploration of advanced carbon anode.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qingzhao Wu,Bochao Chen,Haonan Xie,Xiangren Bai,Ming Liang,Zhiyi Wu,Xiaoying Jin,Chunnian He,Naiqin Zhao
Bismuth-antimony (BiSb) alloy combines the low volume expansion of Bi with the high theoretical capacity of Sb and very suitable for application for energy storage. However, the low reversible capacity and poor conductivity of BiSb are still a challenge for promoting their potassium (K) storage properties. Herein, the homogeneous BiSb nanoconfined in three-dimensional (3D) carbon framework were synthesized by NaCl-template assisted method. In the as-constructed architecture, the nano-sized BiSb alloy particles not only shorten the electronic transport route, but also offer adequate K -storage active sites by virtue of the interface between binary alloy and graphene-like coating layers, which were theoretically validated by the density functional theory simulations. Furthermore, the carbon structure can effectively alleviate the internal stress of BiSb during the charging and discharging processes due to the robust integrated structure, i.e. graphene-like layer coated BiSb that embedded into 3D carbon architecture. As a result, the composite electrode exhibits a stable cycling of 303.5 mA h g −1 after 1000 cycles at 500 mA g −1 , and a high-rate performance of 246.8 mA h g −1 at 2 A g −1 . This work indicates that the enhancement of interfacial K -storage through biphasic synergistic effect will serve as a reference for the development of other energy 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
Nano-Micro Letters
·
2020
·Vol. 13
·期 1
·1-12
·
IF 12.264
Shi Xiaodong,Xu Zhenming,Han Cheng,Shi Runze,Wu Xianwen,Lu Bingan,Zhou Jiang,Liang Shuquan
Small cobalt nanoparticles are carefully encapsulated into a N-doped carbon shell (Co-NC) by calcining a Prussian blue analogue precursor.
The presence of cobalt nanoparticles and Co-N bonds not only promotes adsorption behavior, but also reduces the diffusion energy barrier, enabling fast diffusion kinetics of K + ions.
The good diffusion kinetics and capacitive adsorption behavior of the Co-NC material synergistically contributes to enhanced potassium storage performances.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yinshuang Pang,Qingxue Lai,Ningning Chen,Nailu Shen,Hong Chen,Wanying Zhang,Zhi Liu,Luanjie Nie,Jing Zheng
Even though bottom-up strategy has been successfully developed to construct nanocarbon materials from molecule blocks for energy storage applications, elaborate structure manipulation via a facile and scalable method remains a big challenge. Herein, a facile free-radical C–C coupling-based bottom-up strategy was proposed to controllably construct carbon whisker array @ hollow carbon sphere (CWA@HCS) anode from the molecule block of hexabromobenzene (HBB) for superior K-storage. The novel CWA@HCS anode was easily achieved via the controllable catalysis of C–C coupling reaction on the surface of commercial metallic Cu particles. The optimized CWA@HCS anode delivered a high reversible K-storage capacity of 367.6 mAh/g at 50 mA/g, excellent rate capability (155.5 mAh/g at 1000 mA/g), and excellent long-term cycle performance (182.5 mAh/g maintained after 700 cycles at 500 mA/g). In addition, the full cell assembled from CWA@HCS electrode showed excellent cycle performance and rate performance. These excellent K-storage properties should be attributed to the surface capacitive-dominated K-storage mechanism guaranteed by the three-dimensional (3D) array structure. This study provides a basic reference for the design of advanced nanocarbon materials as well as anode materials for potassium 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
Energy Storage Materials
·
2021
·
IF 17.789
Xiujuan Wang,Sen Zhang,Yong Shan,Ling Chen,Guanyuan Gao,Xiaolin Zhu,Bin Cao,Xiaoming He
Molybdenum diselenide (MoSe 2 ) materials have aroused great attention for Li/K storage due to its high theoretical capacity and low cost. However, MoSe 2 often suffer from poor rate performances and unsatisfied cyclability for Li/K storage due to sluggish kinetics and the structure collapse upon cycling. Herein, a MoSe 2 -SnS heterostructure, SnS nanoparticles anchored at MoSe 2 -graphene matrix (SnS@MoSe 2 -GR), was constructed to improve rate performances and cyclability for Li/K storage. The heterointerfaces between MoSe 2 and SnS can generate unbalance charge distribution and thus induce an interfacial electric-field within the interfaces, which could accelerate charge-transfer kinetics and improve surface reaction kinetics. As a result, SnS@MoSe 2 -GR exhibit excellent electrochemical performances for Li/K storage. The electrochemical storage mechanisms of SnS@MoSe 2 -GR have been investigated by in situ and ex situ characterizations, and DFT calculations. Furthermore, the SnS@MoSe 2 -GR and porous carbon were used as anodes and cathodes to construct K-ion capacitors (KICs), the KICs exhibit an excellent rate performance, outstanding discharge capability and satisfied life-span (a high capacity retention of 93.3% after 5000 cycles). Our work provides new insights and understanding for the development of MoSe 2 based-anodes with high-performance and long-lifespan for Li/K storage.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
固态物理
·
计算材料学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Min Yang,Die Su,Wen Zhang,Jiaxing Wen,Wen Liu,Qi Luo,Li Liu,Xianyou Wang
The excellent electrochemical performance of indium sulfide (In 2 S 3 ) in lithium ion batteries (LIBs) and sodium ion batteries (SIBs) prompted us to explore its energy storage mechanism in potassium ion batteries (PIBs). In this work, In 2 S 3 /C nanofibers are successfully synthesized by simple electrospinning and subsequent vulcanization . In K half cells, compared to commercial In 2 S 3 electrodes, In 2 S 3 /C nanofibers as anode materials for PIBs show outstanding electrochemical performance, which can deliver reversible capacities of 397.6 (25), 366.2 (50), 335.2 (100), 307.8 (200), 260.4 (500) and 212.2 mAh g −1 (1000 mA g −1 ), respectively. In K full cells, In 2 S 3 /C nanofibers can also show good potassium storage performance and can light up 15 light emitting diodes (LEDs). The superb electrochemical performance of In 2 S 3 /C nanofibers is due to the in-situ composite with self-nitrogen-doped carbon matrix and the nanoization of In 2 S 3 particles, which buffers the volume effect and improves the conductivity of the material during the potassium storage process. In addition, the mechanism of potassium storage of In 2 S 3 /C nanofibers was systematically studied by cyclic voltammetry (CV), ex-situ XRD, TEM and XPS methods. The mechanism of In 2 S 3 for K-ion storage can be described as the conversion reaction: In 2 S 3 + 6K + + 6e − ⇌ In + 3K 2 S.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Small Methods
·
2023
·Vol. 7
·期 8
·2201525
·
IF 12.4
Xue Tian,Peng Zhang,Yizhi Liao,Razium A. Soomro,Bin Xu
Antimony-based anode materials are recognized for their high potassium storage capacities and appropriate operating potentials. However, the large volume expansion of Sb during the potassiation/depotassiation process, which results in a quick capacity decay, severely limits its practical application in potassium-ion batteries (PIBs). Here, a carbon-coated Sb/MXene heterostructure composite (CSM) is synthesized by adsorption of Sb 3+ on MXene nanosheets via Sb-O-Ti bonds followed by carbothermic reduction to construct dual-confined MXene@carbon conductive framework capable of withstanding high volume expansion of Sb and conducive to enabling accelerated electron transfer kinetics. The CSM composite, particularly CSM-700, when configured as an anode for PIBs, realized high capacity (484.4 mAh g −1 at 0.1 A g −1 ), an ultra-stable cycling performance with a high reversible capacity of 435.9 mAh g −1 at 0.1 A g −1 after 100 cycles corresponding to a capacity retention rate of 90.0%, and superior rate performance of 323.0 mAh g −1 at 1 A g −1 . The proposed strategy offers a simple route to construct high-performance Sb-based anodes for advanced PIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Qisheng Zang,Qingfeng Zhang,Zuocheng Luo,Luocheng Liao,Xiaoping Ouyang,Shuhong Xie
The anode materials with high capacity, excellent reversibility and good cycling stability are important for potassium-ion batteries (PIBs) application. Herein, we construct a freestanding anode structure by bounding the carbon-coated MoS 2 on porous carbon nanofibers (C@MoS 2 @PCNF) for PIBs. Benefiting from the frame supporting of carbon nanofiber and carbon coating, the C@MoS 2 @PCNF materials have high conductivity and firm electrode structure . The porous structure of the carbon nanofibers alleviate the volume expansion of the MoS 2 nanosheets during the reaction process effectively. Meanwhile, the MoS 2 nanosheets have abundant dislocation defects and larger interlayer spacing. The C@MoS 2 @PCNF materials present excellent potassium storage performance used as PIBs anode. It delivers a high reversible capacity and a superior rate capacity, corresponding value are 323 mA h g −1 after 100 cycles at 100 mA h g −1 current density and 198 mA h g −1 at 1000 mA g −1 current density. The ex-situ atomic force microscope (AFM) images reveal the process of gradually forming SEI on the surface of C@MoS 2 @PCNF during the first cycle. Moreover, the C@MoS 2 @PCNF is assembled for potassium ion capacitor (PIC) with activated carbon (AC) to evaluate the potential application, which presents an excellent cycle stability.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）