CHEMICAL COMMUNICATIONS
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2016
·Vol. 52
·期 75
·11274-11276
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IF 6.567
Jin Han,Maowen Xu,Yubin Niu,Guan-Nan Li,Minqiang Wang,Yan Zhang,Min Jia,Chang ming Li
Novel K2Ti8O17 is successfully fabricated via a facile hydrothermal method combined with a subsequent annealing treatment and further evaluated as an anode material for potassium-ion batteries for the first time. This study may provide a broader vision into developing anode materials for potassium-ion batteries.
研究领域:
材料科学
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能源存储技术
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DOI
PubMed
高影响因子
Advanced Energy Materials
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2017
·Vol. 7
·期 18
·1700700
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IF 16.721
Guodong Zou,Jianxin Guo,Xianyu Liu,Qingrui Zhang,Gang Huang,Carlos Fernandez,Qiuming Peng
Sodium-ion batteries are considered alternatives to lithium-ion batteries for energy storage devices due to their competitive cost and source abundance. However, the development of electrode materials with long-term stability and high capacity remains a great challenge. Here, this paper describes for the first time the synthesis of a new class of core–shell MAX@K 2 Ti 8 O 17 by alkaline hydrothermal reaction and hydrogenation of MAX, which grants high sodium ion-intercalation pseudocapacitance. This composite electrode displays extraordinary reversible capacities of 190 mA h g −1 at 200 mA g −1 (0.9 C, theoretical value of ≈219 mA h g −1 ) and 150 mA h g −1 at 1000 mA g −1 (4.6 C). More importantly, a reversible capacity of 75 mA h g −1 at 10 000 mA g −1 (46 C) is retained without any apparent capacity decay even after more than 10 000 cycles. Experimental tests and first-principle calculations confirm that the increase in Ti 3+ on the surface layers of MAX@K 2 Ti 8 O 17 by hydrogenation increases its conductivity in addition to enhancing the sodium-ion intercalation pseudocapacitive process. Furthermore, the distorted dodecahedrons between Ti and O layers not only provide abundant sites for sodium-ion accommodation but also act as wide tunnels for sodium-ion transport.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jiaxi Sui,Dongdong Liu,Chunyu Wang,Lijuan Wang,Bo Zhong,Yuanyuan Ma
Non-metallic Surface-Enhanced Raman Scattering (SERS) substrate materials with unique structures are considered as promising candidates for detection of dyes in the environment. In this work, a sea urchin-like K 2 Ti 8 O 17 (KTO) nanomaterial was prepared by a facile and efficient hydrothermal method . The enhancement factors of the sea urchin-like KTO for crystal violet and methylene blue are 3.8 × 10 5 and 2.45 × 10 5 respectively, and the minimum detection limits of both can reach 10 −8 M, which means the sea urchin-like KTO a promising non-metallic SERS substrate for detecting dyes in the environment. The excellent SERS performance of the sea urchin KTO was attributed to the excellent charge transfer and probe adsorption capability of KTO by energy band and zeta potential analysis. Finally, the excellent application potential of the sea urchin KTO was verified by simulating a practical use scenario.
研究领域:
材料科学
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环境科学
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Ge Yang,Mengjie Lu,Jinyan Xiong,Gang Cheng
Photocatalytic CO 2 reduction into solar fuels has received increasing attention because it is a promising approach to tackle the environment and energy issues we are currently facing. Herein, the composite of K 2 Ti 8 O 17 nanowires assembly coupled with Cu 7 S 4 cocatalyst has been successfully prepared by an ion exchange method, in which the CuCl is employed as the copper source to convert CdS to Cu 7 S 4 . The photocatalytic performance of the integrated K 2 Ti 8 O 17 -Cu 7 S 4 composite is evaluated by CO 2 photoreduction, and it exhibits superior photoreduction capability than pristine K 2 Ti 8 O 17 nanowires assembly. In particular, the K 2 Ti 8 O 17 -Cu 7 S 4 -0.2 sample displays the highest CH 4 (6.02 μmol g −1 h −1 ) and CO (0.89 μmol g −1 h −1 ) yield within 4 h light irradiation, which is 3.83 and 12.71 times higher than that of K 2 Ti 8 O 17 sample, respectively. Based on the photo/electrochemical test results, the anchoring of Cu 7 S 4 cocatalyst can promote the photogenerated electron-hole pairs separation and charge transfer of the K 2 Ti 8 O 17 , which contributes to more photogenerated electrons participating in the process of photocatalytic CO 2 reduction to CH 4 . This work offers a promising approach to design efficient noble-cocatalyst-free photocatalyst for CO 2 photoreduction.
研究领域:
材料科学
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环境科学
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化学
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2332
·
IF 5.076
Qiangqiang Feng,Yanyan Liu,Jitong Yan,Wei Feng,Shaozheng Ji,Yongfu Tang
A promising aqueous aluminum ion battery (AIB) was assembled using a novel layered K2Ti8O17anode against an activated carbon coated on a Ti mesh cathode in an AlCl3-based aqueous electrolyte. The intercalation/deintercalation mechanism endowed the layered K2Ti8O17as a promising anode for rechargeable aqueous AIBs. NaAc was introduced into the AlCl3aqueous electrolyte to enhance the cycling stability of the assembled aqueous AIB. The as-designed AIB displayed a high discharge voltage near 1.6 V, and a discharge capacity of up to 189.6 mAh g−1. The assembled AIB lit up a commercial light-emitting diode (LED) lasting more than one hour. Inductively coupled plasma–optical emission spectroscopy (ICP-OES), high-resolution transmission electron microscopy (HRTEM), and X-ray absorption near-edge spectroscopy (XANES) were employed to investigate the intercalation/deintercalation mechanism of Na+/Al3+ions in the aqueous AIB. The results indicated that the layered structure facilitated the intercalation/deintercalation of Na+/Al3+ions, thus providing a high-rate performance of the K2Ti8O17anode. The diffusion-controlled electrochemical characteristics and the reduction of Ti4+species during the discharge process illustrated the intercalation/deintercalation mechanism of the K2Ti8O17anode. This study provides not only insight into the charge–discharge mechanism of the K2Ti8O17anode but also a novel strategy to design rechargeable aqueous AIBs.Keywords:aluminum ion battery;K2Ti8O17anode;discharge–charge mechanism
研究领域:
材料科学
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电化学
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PubMed
高影响因子
NANO
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2026
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IF 1.3
Dongliang Liu,Chenghong Liu,Jianxiong Zhang,Zhihua Xu,Chang Xiong,Muhammad Saeed,Yanbo Li,Shengpei Wang
Liquid-blocked phenolic 2-ethylentvl 3-(3,5-di-tert-butyl-4-hydroxphheny)propanoate (EDHP) is commonly utilized as an antioxidant in industrial lubricants to increase the service life of lubricating oil. The conventional homogeneous catalytic transesterification method for preparing EDHP necessitates a significant amount of organic solvents for treating the intermediate, resulting in substantial labor and material costs, ultimately increasing application expenses. Here, a series of porous potassium titanate (K 2 Ti 8 O 1 7 , KTiO) nanoparticles with varying specific surface area (BET) and pore diameter distributions were developed by a simple hydrothermal calcination method for highly efficient and selective catalysis in the transesterification synthesis of EDHP. Transesterification results indicate that Brunauer–Emmett–Teller (BET) significantly impacts the catalytic performance of KTiO, leading to a conversion rate of methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (MDHP) reaching 98.3% and the selectivity reaching 99.70% in the presence of KTiO-400 catalyst at 1 7 5 ∘ C . The transesterification time of heterogeneous catalysis is 2.5 h, which is comparable to that of commercial homogeneous catalysis (tetrabutyl titanate, TBOT), owing to the high BET (182.42 m 2 g − 1 ) of KTiO-400. Current research demonstrates that the use of porous KTiO nanoparticles represents a significant advancement in the field of heterogeneous catalytic organic synthesis and expands the potential applications of nano-titanate in industrial catalysis.
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高影响因子
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