Small
·
2021
·Vol. 17
·期 35
·2101720
·
IF 13.281
Yijie Wang,Aoshuang Li,Chuanwei Cheng
Developing highly active, cost-effective, and durable bifunctional oxygen electrocatalysts is an important step for the advancement of rechargeable Zn–air batteries (ZABs). Herein, an efficient bifunctional oxygen electrocatalyst of ultrathin Co(OH) 2 nanosheets supported on nitrogen-doped carbon nanoflake arrays (named as Co(OH) 2 @NC), is reported, which yields excellent bifunctional activity, i.e., a low overpotential of 285 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER), a high half-wave potential (0.83 V) for oxygen reduction reaction (ORR), and a low potential gap (Δ E ) of 0.69 V. The excellent bifunctional catalytic performance can be ascribed to the concerted efforts of cobalt hydroxide toward OER and nitrogen-doped carbon for ORR. The Co(OH) 2 @NC nanoflake arrays is further used as binder-free air cathodes for rechargeable Zn–air batteries, exhibiting a high specific capacity of 798.3 mAh g Zn −1 , improved stability (a working life of >70 h at 5 mA cm −2 ), as well as a reduced long-term charging voltage, which outperforms the counterparts of NC nanoflake arrays and Pt/C-based air cathodes. One step further, the Co(OH) 2 @NC nanoflake arrays on carbon cloth are directly used as binder-free air cathodes for flexible, solid-state ZABs, showing excellent performance under deformation as well.
研究领域:
电化学
·
能源材料
·
纳米材料科学
·
催化化学
·
可充电电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ting Li,Yikun Wang,Lingling Yuan,Qianwen Zhou,Shuangyan Qiao,Zhengqing Liu,Shaokun Chong
Conversion mechanism anode materials have been widely employed for potassium ion batteries (PIBs) due to high theoretical specific capacities. However, large volume expansion and poor electrochemical kinetics have become the key bottlenecks hindering its further development. Herein, α-MnSe nanorods wrapped by N-doped carbon and graphene (α-MnSe@NC@graphene) are constructed as anode materials for PIBs . The architecture can not only provide superior electrode integrity to buffer volume variation and maintain structure stability via synergistic effects of physical encapsulation and Mn-C chemical bonding, but also serve as conductive network to accelerate the electron transfer and K-ion diffusion. As a result, α-MnSe@NC@graphene composite delivers high initial charge specific capacity of 307.9 mAh·g −1 and great cycling stability over 250 cycles with the capacity retention of 232.8 mAh·g −1 at 50 mA·g −1 . Besides, superior rate capability (91.1 mAh·g −1 at 2.0 A·g −1 ) and long lifespan over 700 cycles at 1.0 A·g −1 with the low capacities decay rate of 0.064% per cycle can be acquired. Ex situ TEM and XPS results verify that K-ion insert into/extract from α-MnSe@NC@graphene through a conversion mechanism based on the Mn-ion redox site (MnSe + 2 K + + 2e - ↔ Mn + K 2 Se).
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机功能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 19
·9579-9589
·
IF 11.301
Yuhan Li,Libo Zhang,Zongjie Sun,Guoxin Gao,Shiyao Lu,Min Zhu,Yanfeng Zhang,Zhiyu Jia,Chunhui Xiao,Huaitian Bu,Kai Xi,Shujiang Ding
Here we prepare a hexagonal boron nitride (h-BN)–polyethylene oxide composite polymer electrolyte via a convenient casting method, which shows high mechanical strength. Meanwhile, the electrochemical properties (electrochemical window and lithium ion transference number) are enhanced but the ionic conductivity of the h-BN composite electrolyte is decreased after adding h-BN. Density functional theory (DFT) calculation results show that a stronger binding effect is observed between TFSI− and BN, compared to that between Li+ and BN. Molecular dynamics (MD) simulations are also utilized to study the mechanism behind the enhanced Li ion diffusion by h-BN addition. Li+ diffusion in PEO/LiTFSI/BN is lower than that in the PEO/LiTFSI system, but the diffusion of TFSI− exhibits a more significant decline rate in the presence of BN. This indicates that the presence of BN suppresses anion motion and enhances selectivity in Li+ transport. Thus, the PEO/LiTFSI/h-BN composite electrolyte exhibits higher Li ion conductivity but lower anion diffusivity than the PEO/LiTFSI system. Hence the h-BN composite polymer electrolyte in a Li/Li symmetric battery provides a long cycling time of 430 h at 0.2 mA cm−2. A Li metal/LiFePO4 full battery with the PEO/LiTFSI/h-BN composite electrolyte also works more efficiently for long-term cycling (140 cycles) than a filler-free PEO based electrolyte (39 cycles).
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
固态离子学
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2018
·Vol. 12
·期 3
·214-224
·
IF 1.478
Chen Mengna,Zeng Peiyuan,Zhao Yueying,Fang Zhen
CoP is a candidate lithiumstorage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to synthesize N-doped carbon nanotubes wrapping CoP nanoparticles (CoP@N-CNTs). Integration of nanosized particles and hollow-doped CNTs render the as-prepared CoP@N-CNTs excellent cycling stability with a reversible charge capacity of 648 mA·h·g −1 at 0.2 C after 100 cycles. The present strategy has potential application in the synthesis of phosphide enwrapped in carbon nanotube composites which have potential application in lithium-ion storage and energy conversion.
研究领域:
材料科学
·
电化学
·
纳米能源材料
·
储能技术
·
无机功能材料
✓ 已验证
DOI
高影响因子
Nano Research
·
2017
·Vol. 10
·期 10
·3457-3467
·
IF 7.354
Sun Yan,Huang Fangzhi,Li Shikuo,Shen Yuhua,Xie Anjian
A Co-based metal-organic framework (Co-MOF) with a unique three-dimensional starfish-like nanostructure was successfully synthesized using a simple ultrasonic method. After subsequent carbonization and oxidation, a nanocomposite of nitrogen-doped carbon with a Co 3 O 4 coating (Co 3 O 4 @N-C) with a porous starfish-like nanostructure was obtained. The final hybrid exhibited excellent lithium storage performance when evaluated as an anode material in a lithiumion battery. A remarkable and stable discharge capacity of 795 mAh·g −1 was maintained at 0.5 A·g −1 after 300 cycles. Excellent rate capability was also obtained. In addition, a full Co 3 O 4 @N-C/LiFePO 4 battery displayed stable capacity retention of 95% after 100 cycles. This excellent lithium storage performance is attributed to the unique porous starfish-like structure, which effectively buffers the volume expansion that occurs during Li + insertion/deinsertion. Meanwhile, the nitrogendoped carbon coating enhances the electrical conductivity and provides a buffer layer to accommodate the volume change and accelerate the formation of a stable solid electrolyte interface layer.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yanhua Li,Shuhuan Wang,Kuo Zhang,Dongjia Wang,Qun Li,Yuekai Xue
Herein, the N-doped Ti 3 C 2 /TiO 2 nanostructure has been synthesized via hydrothermal treatment and following annealing in NH 3 . TiO 2 nanoparticles in-situ grow on the surface of Ti 3 C 2 spontaneously, resulting in the stable electron transport between TiO 2 and Ti 3 C 2 . Besides, Ti 3 C 2 nanosheets as conductive substrates make up for the poor conductivity of TiO 2 . The doping of N in Ti 3 C 2 /TiO 2 composite further improves the electrical conduction. The ultimate N-doped Ti 3 C 2 /TiO 2 composite achieves a higher specific capacitance of 737.4 F g −1 than Ti 3 C 2 (324.4 F g −1 ) at 0.5 A g −1 . More importantly, the composite displays a high specific capacitance retention of 81 % over 12,000 cycles. Besides, the assembled symmetrical supercapacitor (SSC) manifests an excellent specific capacitance of 236.4 F g −1 at 1 A g −1 and a comparable energy density of 32.8 Wh kg −1 at the power density of 500 W kg −1 . This work provides promising guidance for the fabrication of durable electrodes for energy storage application.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
·
表面工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jie Song,Ye Xu,Yujue Wang,Shenghu Li,Siyi Yin,Wanglai Cen,Dan Xiao,Qian Zhao,Xicui Zhang,Yan Meng
Hard carbons are significant in sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs). However, the structural defects of hard carbons lead to poor rate performance and cycling stability, which need further improvement. The waste cooking oil was used as the precursor to synthesize 3D carbon nanosheets (NWCOC) with amino nitrogen functional groups, multi-layered pores, and expanded interlayer spacing. The excellent electrochemical properties of NWCOC were investigated and it was demonstrated that NWCOC can significantly improve the adsorption of Na + /K + on hard carbons, substantially enhancing the embedding/de-embedding of Na + /K + , reducing the diffusion distance of ions and electrons, and improving their adaptability to volume changes. In situ XRD and Raman characterization reveal that the Na storage mechanism of NWCOC is mainly based on adsorption/intercalation-filling. Combined with density functional theory, it is shown that the porous structures doped with nitrogen have a greater propensity for ion adsorption, resulting in increased ion capture and storage. As expected, NWCOC650 exhibits high capacities of 489.4 and 388.3 mAh/g in SIBs and PIBs. NWCOC650 displays superior performance in the Na 3 V 2 (PO 4 ) 3 /NWCOC650 full cell, achieving a capacity of 107.84 mAh/g. This work presents a new perspective on the synthesis and mechanisms of high-performance anodes for SIBs and PIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 23
·15998
·
IF 3.9
Jiehong He,Pin Lv,Jian Zhu,Hexing Li
Correction for ‘Selective CO 2 reduction to HCOOH on a Pt/In 2 O 3 /g-C 3 N 4 multifunctional visible-photocatalyst’ by Jiehong He et al. , RSC Adv. , 2020, 10 , 22460–22467, https://doi.org/10.1039/D0RA03959D .
研究领域:
催化化学
·
环境科学
·
材料科学
·
能源化学
·
光化学
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 18
·7333-7342
·
IF 4.569
Hua Yu,Liuyan Zhou,Renguang Ye,Degang Deng,Shiqing Xu
Polychromatic emission can be achieved by controlling the distribution of the rare earth activator in multi-cation lattices, which can be used in the fields of white light LED and fluorescence temperature sensing. However, it is still a challenge to control their distribution and location of the target site in a given host material because the distribution of the rare earth activator is uncertain. In this paper, we have chosen Li4SrCa(SiO4)2 as the multi-cation site host and induced the distribution of Eu2+ ions between different cation sites through anion substitution, for the first time, to regulate the luminescence characteristics of a series of Li4SrCaSi2O8−yN2y/3:Eu2+ phosphors. In Li4SrCa(SiO4)2:Eu2+ phosphors, the substitution of O2− by N3− triggered a distinct ordered to disordered structure transition of the SiO4 tetrahedron and induced the remote distribution of the Eu2+ activator, which was verified through the analysis of the XRD, EPR, FT-IR and fluorescence spectra. Due to the location of Eu2+ ions in different cation sites (Eu2+Sr and Eu2+Ca), two distinguishable emission peaks with tunable color emissions and different responses to temperature were realized. The white LED that utilized blue-orange-emitting Li4SrCaSi2O4N8/3:Eu2+ and green-emitting BaSi2O2N2:Eu2+ (500 nm) displayed an outstanding color rendering index (Ra) of 85.1. Based on the fluorescence intensity ratio (FIR) technique, an optical temperature measurement mechanism was hypothesized and studied in the temperature range of 293–473 K. The highest Sa of the material was 0.086 K−1, and Sr was 1.76% K−1 based on the FIR detection technology, revealing obviously better than most inorganic optical temperature-measuring materials reported before. Our work indicates that Li4SrCaSi2O8−2yN4y/3:Eu2+ is a promising material for application in White LEDs and optical thermometers.
研究领域:
材料科学
·
发光材料
·
无机化学
·
光电子学
·
传感器技术
✓ 已验证
DOI
高影响因子
Energy Materials
·
2022
·Vol. 2
·期 5
·N
·
IF 0
Yi Guo,Cheng Liu,Lei Xu,Kaixin Huang,Hao Wu,Wenlong Cai,Yun Zhang
The article reveals that nitrogen-doped carbon coating from discarded cigarette filters can improve zinc-ion battery performance by suppressing side reactions and dendrite growth.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
环境功能材料
✓ 已验证
DOI
RSC Advances
·
2021
·Vol. 11
·期 16
·9450-9458
·
IF 3.361
Rui Zhang,Zheng Wang,Lin Zhu,Weixin Lv,Wei Wang
For the electrochemical reduction of oxygen the development of heteroatom-doped carbon-based transition metal catalysts has become a recognized strategy to replace traditional noble metal catalysts. In this work a catalyst consisting of CoFe nanoparticles encapsulated in N-doped carbon-based materials (NC) supported by carbon nanotubes (CNTs), i.e. Fe3Co1@NC/CNTs, was modified via treatment with a phosphate salt to synthesize a P-Fe3Co1@NC/CNTs catalyst. The P-Fe3Co1@NC/CNTs exhibits with 5.29 mA cm−2 an enhanced current density which is comparable to a Pt/C catalyst. In addition, a stability and methanol resistance better than the Pt/C catalyst were observed which is ascribed to the carbon encapsulation and the synergies between the two transition metals. Finally, the reaction mechanism of P-doping was studied and discussed. These results provide possible directions for carbon-based catalysts and doping with heteroatoms for the improvement of catalytic activity. Moreover, the zinc–air battery assembled with P-Fe3Co1@NC/CNTs as the air-cathode exhibited a high-power density of 73 mW cm−2, which is comparable to that of Pt/C (71 mW cm−2) and a specific capacity of 763 mA h g−1. The prepared catalyst could potentially serve to take the place of precious metal catalysts in rechargeable Zn–air batteries.
研究领域:
电催化
·
材料化学
·
能源化学
·
纳米材料
·
电化学能源存储
·
燃料电池
·
金属-空气电池
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Xiaojing Jiang,Jianian Chen,Fenglei Lyu,Chen Cheng,Qixuan Zhong,Xuchun Wang,Ayaz Mahsud,Liang Zhang,Qiao Zhang
Controllable fabrication of Fe-N-C based single-atom catalysts (SACs) for enhanced electrocatalytic performance is highly desirable but still challenging. Here, an in situ surface-confined strategy was demonstrated for the synthesis of single atomic Fe-N 4 on N-doped carbon nanoleaves (L-FeNC). The in situ generated Zn 3 [Fe(CN) 6 ] 2 could not only serve as a protection layer against collapse of nanoleaves but also provide abundant Fe source for the formation of Fe-N moieties during pyrolysis, leading to high surface area and high graphitization degree of L-FeNC simultaneously. Benefiting from abundant Fe-N 4 active sites, enhanced mass and charge transfer, the as-prepared L-FeNC manifested a half-wave potential of 0.89 V for oxygen reduction reaction (ORR) in 0.1 M KOH. A maximum power density of 140 mW cm −2 and stable discharge voltage even after operation for 50,000 s have been demonstrated when the L-FeNC was used as air cathode for Zn-air battery. This work not only provided a unique surface-confined strategy for the synthesis of two-dimensional nanocarbons, but also demonstrated the significant benefit from rational design and engineering of Fe-N-C SACs, thus offering great opportunities for fabrication of efficient energy conversion and storage devices.
研究领域:
材料科学
·
电化学
·
能源存储与转换
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）