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Recent Advances and Perspectives of Lewis Acidic Etching Route:An Emerging Preparation Strategy for MXenes

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Nano-Micro Letters 2023年第5期15卷 187-235页

作者： Pengfei Huang wei-qiang han School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027People’s Republic of China

Since the discovery in 2011,MXenes have become the rising star in the field of two-dimensional *** from the metallic-level conductivity,large and adjustable gallery spacing,low ion diffusion barrier,rich surface chemistry,superior mechanical strength,MXenes exhibit great application prospects in energy storage and conversion,sensors,optoelectronics,electromagnetic interference shielding and ***,two issues seriously deteriorate the further development of *** is the high experimental risk of common preparation methods such as HF etching,and the other is the difficulty in obtaining MXenes with controllable surface ***,Lewis acidic etching,as a brand-new preparation strategy for MXenes,has attracted intensive attention due to its high safety and the ability to endow MXenes with uniform ***,a comprehensive review of Lewis acidic etching method has not been reported ***,we first introduce the Lewis acidic etching from the following four aspects:etching mechanism,terminations regulation,in-situ formed metals and delamination of multi-layered ***,the applications of MXenes and MXene-based hybrids obtained by Lewis acidic etching route in energy storage and conversion,sensors and microwave absorption are carefully ***,some challenges and opportunities of Lewis acidic etching strategy are also presented.

关键词： Lewis acidic etching MXenes Etching mechanism Termination regulation In-situ formed metals Delamination Application

Hierarchical utilization of raw Ti_(3)C_(2)T_(x) MXene for fast preparation of various Ti_(3)C_(2)T_(x) MXene derivatives

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Nano Research 2022年第3期15卷 2746-2755页

作者： Shunlong Zhang hangjun Ying Pengfei Huang Tiantian Yang wei-qiang han School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

Due to easy re-stacking,low yield of few-layered MXenes(f-MXenes),the applications of MXenes are mainly restricted in multi-layered MXenes(m-MXenes)*** f-MXenes can be prepared from m-MXenes,after exfoliation process,a mass of sediments which are still essentially compact MXenes are usually directly discarded,leading to low utilization of raw ***,a classified preparation strategy is adopted to exploit the raw m-MXenes and traditional MXenes sediments,taking multi-layered Ti_(3)C_(2)T_(x)MXene as an *** rational delamination and subsequent treatment to Ti_(3)C_(2)T_(x)sediments,we succeed in achieving classified and large-scale preparation of various Ti_(3)C_(2)T_(x)MXene derivatives,including few-layered Ti_(3)C_(2)T_(x)(f-Ti_(3)C_(2)T_(x))powders,f-Ti_(3)C_(2)T_(x)films,and Ti_(3)C_(2)T_(x)MXene-derived nanowires with heterostructure of potassium titanate and Ti_(3)C_(2)T_(x).We demonstrate the necessity of“step-by-step delamination”towards traditional Ti_(3)C_(2)T_(x)sediments to improve the yield of f-Ti_(3)C_(2)T_(x)from 15%to 72%;the feasibility of“solution-phase flocculation(SPF)”to fundamentally solve the re-stacking phenomenon,and oxidation degradation issues of f-Ti_(3)C_(2)T_(x)during storage;as well as the convenience of SPF to deal with time-consuming issues of fabricating Ti_(3)C_(2)T_(x)***’s more,alkali-heat treatment of final Ti_(3)C_(2)T_(x)sediments turns waste into treasure of Ti_(3)C_(2)T_(x)-derived nanowires,leading to 100%utilization of raw Ti_(3)C_(2)T_(x).The content of one-dimensional(1D)nanowires in the hybrids can be adjusted by controlling alkalization *** 3D architecture heterostructure composed of 1D nanowires and 2D nanosheets exhibits gorgeous application *** work can expand preparation and application of various MXenes derivatives,promoting process of various MXenes.

关键词： MXenes MXenes derivatives Ti_(3)C_(2)T_(x) step-by-step delamination solution-phase flocculation Alkali-heat treatment

Partial Atomic Tin Nanocomplex Pillared Few-Layered Ti_(3)C_(2)Tx MXenes for Superior Lithium-Ion Storage

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Nano-Micro Letters 2020年第6期12卷 176-189页

作者： Shunlong Zhang hangjun Ying Bin Yuan Renzong Hu wei-qiang han School of Materials Science and Engineering Zhejiang University310027 HangzhouPeople’s Republic of China School of Materials Science and Engineering South China University of Technology510641 GuangzhouPeople’s Republic of China Key Laboratory of Advanced Energy Storage Materials of Guangdong Province 510641 GuangzhouPeople’s Republic of China

MXenes have attracted great interest in various fields,and pillared MXenes open a new path with larger interlayer ***,the further study of pillared MXenes is blocked at multilayered state due to serious restacking phenomenon of few-layered MXene *** this work,for the first time,we designed a facile NH4+method to fundamentally solve the restacking issues of MXene nanosheets and succeeded in achieving pillared few-layered *** nanocomplex pillared few-layered Ti3C2Tx(STCT)composites were synthesized by introducing atomic Sn nanocomplex into interlayer of pillared few-layered Ti3C2Tx MXenes via pillaring *** MXene matrix can inhibit Sn nanocomplex particles agglomeration and serve as conductive ***,the Sn nanocomplex particles can further open the interlayer spacing of Ti3C2Tx during lithiation/delithiation processes and therefore generate extra *** from the“pillar effect,”the STCT composites can maintain 1016 mAh g^?1 after 1200 cycles at 2000 mA g^?1 and deliver a stable capacity of 680 mAh g^?1 at 5 A g^?1,showing one of the best performances among MXene-based *** work will provide a new way for the development of pillared MXenes and their energy storage due to significant breakthrough from multilayered state to few-layered one.

关键词： Pillared MXene Few-layered MXene Tin nanocomplex Lithium-ion storage

Freestanding and Flexible Interfacial Layer Enables Bottom-Up Zn Deposition Toward Dendrite-Free Aqueous Zn-Ion Batteries

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Nano-Micro Letters 2022年第11期14卷 157-171页

作者： hangjun Ying Pengfei Huang Zhao Zhang Shunlong Zhang Qizhen han Zhihao Zhang Jianli Wang wei-qiang han School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027People’s Republic of China

Aqueous rechargeable zinc ion batteries are regarded as a competitive alternative to lithium-ion batteries because of their distinct advantages of high security,high energy density,low cost,and environmental ***,deep-seated problems including Zn dendrite and adverse side reactions severely impede the practical *** this work,we proposed a freestanding Zn-electrolyte interfacial layer composed of multicapsular carbon fibers(MCFs)to regulate the plating/stripping behavior of Zn *** versatile MCFs protective layer can uniformize the electric field and Zn^(2+)flux,meanwhile,reduce the deposition overpotentials,leading to high-quality and rapid Zn deposition ***,the bottom-up and uniform deposition of Zn on the Zn-MCFs interface endows long-term and high-capacity ***,the Zn@MCFs symmetric batteries can keep working up to 1500 h with 5 mAh cm^(−2).The feasibility of the MCFs interfacial layer is also convinced in Zn@MCFs||MnO_(2) ***,the Zn@MCFs||α-MnO_(2)batteries deliver a high specific capacity of 236.1 mAh g^(−1)at 1 A g^(−1)with excellent stability,and maintain an exhilarating energy density of 154.3 Wh kg^(−1) at 33%depth of discharge in pouch batteries.

关键词： Aqueous zinc-ion battery Flexible interfacial layer Dendrite inhibition Bottom-up deposition Moderate zincophilicity

Rational Design of Porous N-Ti3C2 MXene@CNT Microspheres for High Cycling Stability in Li–S Battery

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Nano-Micro Letters 2020年第1期12卷 40-53页

作者： Jianli Wang Zhao Zhang Xufeng Yan Shunlong Zhang Zihao Wu Zhihong Zhuang wei-qiang han School of Materials Science and Engineering Zhejiang University

Herein,N-Ti3C2@CNT microspheres are successfully synthesized by the simple spray drying *** the preparation process,HCl-treated melamine(HTM)is selected as the sources of carbon and *** not only realizes in situ growth of CNTs on the surface of MXene nanosheets with the catalysis of Ni,but also introduces efficient N-doping in both MXene and *** the microsphere,MXene nanosheets interconnect with CNTs to form porous and conductive *** addition,N-doped MXene and CNTs can provide strong chemical immobilization for polysulfides and effectively entrap them within the porous ***-mentioned merits enable N-Ti3C2@CNT microspheres to be ideal sulfur *** used in lithium–sulfur(Li–S)battery,the N-Ti3C2@CNT microspheres/S cathode delivers initial specific capacity of 927 mAh g−1 at 1 C and retains high capacity of 775 mAh g−1 after 1000 cycles with extremely low fading rate(FR)of 0.016%per ***,the cathode still shows high cycling stability at high C-rate of 4 C(capacity of 647 mAh g−1 after 650 cycles,FR 0.027%)and high sulfur loading of 3 and 6 mg cm−2 for Li–S batteries.

关键词： Spray drying method N-Ti3C2 MXene@CNT microspheres Nitrogen-doping High cycling stability Lithium-sulfur battery

An effective artificial layer boosting high-performance all-solid-state lithium batteries with high coulombic efficiency

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Journal of Materiomics 2022年第2期8卷 257-265页

作者： Jianli Wang Zhao Zhang hangjun Ying Shunlong Zhang Hui Tan Gaorong han wei-qiang han School of Materials Science and Engineering Zhejiang University38 Zheda RoadHangzhou310027China

All-solid-state lithium batteries(ASSLBs)employ high-capacity lithium(Li)metal as the anode and exhibit a higher energy density than that of conventional Li-ion ***,the problems arose from the Li dendrites induce severely parasitic reaction between Li and electrolytes,leading to low coulombic efficiency(CE)and poor cyclic ***,a poly(vinylidene-co-hexafluoropropylene)/lithium nitrate(PVDF-HFP/LiNO_(3),marked as PFH/LN)artificial layer is employed to modified Li and achieve high CE ASSLBs with polyethylene oxide-Li_(6.4) La_(3)Zr_(1.4)Ta_(0.6)O_(12)(PEO-LLZTO)*** serves as a functionalized additive to facilitate the formation of a robust solid electrolyte interface(SEI),effi-ciently suppressing the formation of Li ***,LN as a“binder”effectively links PFH with Li,providing good *** possesses high mechanical strength and moderate flexibility,which can not only physically inhibit the growth of Li dendrites,but also maintain the structural integrity of arti-ficial layer over long-term ***,Li/Li cells with such artificial layer demonstrate ultralong cycle life of 1800 and 1000 h under 0.2 and 0.4 mA cm^(-1),***,high CE can be achieved when applied in both LiFePO 4 full cells and Li-Cu half *** work offers a facile and efficient strategy to greatly promote CE in PEO-based ASSLBs.

关键词： All-solid-state lithium batteries High coulombic efficiency PVDF-HFP/LiNO 3 artificial layer PEO-LLZTO electrolyte A robust SEI

混合综采工作面覆岩运移规律及空间结构特征分析

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煤炭学报 2017年第2期42卷 388-396页

作者：殷伟张强韩晓乐孙强巨峰中国矿业大学煤炭资源与安全开采国家重点实验室江苏徐州221116 中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221116

基于平煤十二矿深部开采面临的排矸量大、辅助运输困难、矿区环境污染以及常规充填面产能不足工程背景,创新了矸石充填与垮落法混合综采技术并阐述了其技术内涵。采用理论分析、物理相似模拟和现场实测方法系统地研究了混合综采工作面... 详细信息

基于平煤十二矿深部开采面临的排矸量大、辅助运输困难、矿区环境污染以及常规充填面产能不足工程背景,创新了矸石充填与垮落法混合综采技术并阐述了其技术内涵。采用理论分析、物理相似模拟和现场实测方法系统地研究了混合综采工作面覆岩运移规律和空间结构特征。通过理论分析得到了不同充实率状态下混合综采工作面覆岩空间结构特征;物理相似模拟结果表明,混合综采工作面充填段基本顶仅发生弯曲下沉,而垮落段直接顶垮落、基本顶断裂,垮落段基本顶平均下沉量是充填段的4.2倍,覆岩空间结构表现出明显的非对称特征。矿压实测数据显示,充填段采场无明显的来压现象,垮落段来压现象显著,初次来压步距约30 m,周期来压步距约22 m,动载系数达1.7左右;岩层钻孔窥视结果观察到充填段顶板完整,覆岩空间结构呈现"两带"发育特征;垮落段覆岩结构呈"三带"发育特征,混合综采工作面覆岩非对称性空间结构特征显著。

关键词：混合综采矸石充填充实率覆岩空间结构

Usefulness of DWI in the evaluation of pulmonary isolated lesions

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The Chinese-German Journal of Clinical Oncology 2010年第7期9卷 388-390页

作者： Zhiyong Li Tingting Zhang Bin Xu qiang wei Rui han wei Liu Jianlin Wu Department of Radiology the First Affiliated Hospital of Dalian Medical University Dalian 116011 China

Objective： The aim of our study was to investigate the value of Diffusion-weighted MR imaging （DWl） for evaluating differential diagnosis of pulmonary isolated lesions. Methods： Twenty-seven consecutive patients enrolled in this study, all of whom underwent single direction DWl examinations and received a histologic and clinical diagnosis. Diffusion factor B value was 300, 500, 800 s/mm2, respectively. DWl images of twenty cases could be satisfied to measurement and diagnosis and success rate was percent 74. Among these, lung tuberculoma 5 cases, harmatoma 3 cases, peripheral lung cancer 12 cases. The apparent diffusion coefficient （ADC） values of the lesions were measured. Statistical analyses were performed with the independent samples t test for comparing difference of ADC values between malignant nodules and benign nodules at different 8 value. Results： DWI images of twenty cases could be satisfied and its success rate was percent 74. When B value was 300 s/mm2, ADC values of malignant nodules and benign nodules were 0.002192±0.0006091 mm2/s, 0.002454 ± 0.0007892 mm2/s, respectively, and P = 0.442. When B value was 500 s/mm2, ADC value of malignant nodules and benign nodules were 0.002065 ± 0.0006769 mm2/s, 0.002871± 0.0007746 mm2/s, respectively, and P = 0.033. When B value was 800 s/mm2, ADC value of malignant nodules and benign nodules were 0.001646 ± 0.0004292 mm2/s, 0.002651 ＋ 0.0008041 mm2/s, respectively, and P = 0.009. There were the most different between malignant nodules and benign nodules at B value 800 and statistical significance. Conclusion： Lung DWl imaging is helpful to diagnosis and differential diagnosis between malignant and benign isolated nodules. The ADC value of benign lesions was statistically higher than that of malignant tumors.

关键词： diffusion imaging neoplasm diagnosis

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涡扇发动机高压涡轮前温度组合估计方法

航空动力学报 2016年第12期31卷 3026-3033页

作者：赵勇李本威宋汉强孙涛海军航空工程学院飞行器工程系中国人民解放军91331部队

考虑到目前暂无法实现机载条件下高压涡轮前温度直接、可靠的测量,提出一种用于涡扇发动机高压涡轮前温度估计的方法.基于涡扇发动机的能量守恒原理,建立高压涡轮前温度与气路参数的热力学关系,进而推导出高压涡轮前温度的6个估计模型.... 详细信息

考虑到目前暂无法实现机载条件下高压涡轮前温度直接、可靠的测量,提出一种用于涡扇发动机高压涡轮前温度估计的方法.基于涡扇发动机的能量守恒原理,建立高压涡轮前温度与气路参数的热力学关系,进而推导出高压涡轮前温度的6个估计模型.将各温度模型中不易测量的参数以整体的形式作为温度模型系数,并利用某涡扇发动机性能仿真模型建立温度模型系数与可测状态参数的多项式关系,最终确立高压涡轮前温度的组合估计模型.验证结果表明:组合估计方法在发动机健康及性能衰退状态下都具有较高的精度,其性能最好模型的方均根误差不超过1%.与已有线性拟合、神经网络等方法的对比也表明组合估计方法不论在精度还是性能稳定性方面都具有明显优势.

关键词：涡扇发动机涡轮前温度组合估计气路热力学性能衰退使用寿命监视