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| 1 | An improved trust region method for unconstrained optimization显示文摘In this paper,we propose an improved trust region method for solving unconstrained optimization problems.Different with traditional trust region methods,our algorithm does not resolve the subproblem within the trust region centered at the current iteration point,but within an improved one centered at some point located in the direction of the negative gradient,while the current iteration point is on the boundary set.We prove the global convergence properties of the new improved trust region algorithm and give the computational results which demonstrate the effectiveness of our algorithm. | ZHOU QingHua ZHANG YaRui XU FengXia GENG Yan SUN XiaoDian | 2013 | Science China Mathematics2013，56，2： | 5 |
| 2 | Facile synthesis of colloidal nitrogen-doped titanium carbide sheets with enhanced electrochemical performance显示文摘Heteroatom nitrogen doping in two-dimensional transition metal carbides,known as MXenes,has been considered as a promising strategy for modulating their electronic structure and electrochemical reactivity.While hightemperature annealing in the presence of a nitrogen source has been one popular method to introduce nitrogen,annealing exfoliated multilayered MXenes typically brings about incomplete delamination and the treatment of delaminated monolayer MXenes often leads to irreversible restacking.Here,starting from the typical carbide precursor,we developed an aqueous colloid containing monolayered nitrogen-doped titanium carbide sheets with excellent dispersity and stability.This achievement is critically dependent on the retaining of the hydrophilic surface of host layers during annealing treatment.The successful realization of nitrogen doping into individual MXene monolayers resulted in enhanced electrical conductivity and redox reactivity,for which the sample exhibited excellent capacitive electrochemical performance(586 F/g at a scan rate of 5mV/s)and cycling stability(capacitance retention of 96.2%after 104 cycles at 5 A/g).This paper presents a feasible and simple strategy for designing nitrogen-doped MXenes colloid,the realization of which promises its facile uses in liquid phase engineering techniques toward versatile applications. | Tianlun Qiu Guohui Li Yuanlong Shao Kun Jiang Fangfang Zhao Fengxia Geng | 2020 | Carbon Energy2020，2，4： | 2 |
| 3 | Two-dimensional tungstate nanosheets for constructing novel photochromic hydrogel with ultrahigh flexibility显示文摘A hydrogel possessing interesting photochromic behaviors was developed by in situ ultraviolet(UV)irradiation-assisted polymerization of an aqueous solution of N-isopropylacrylamide monomer in the presence of cesium tungstate nanosheets.By this process,a hierarchical porous network structure was finely constructed while showing ultrahigh flexibility.More importantly,the newly prepared hydrogel retained the photochromic properties of the cesium tungstate nanosheets.The color transitions could be readily controlled by UV laser irradiation and were completely reversible via laser exposure or dark treatment.The nanocomposite hydrogel with its excellent photochromic properties and ultrahigh flexibility will have great applications in flexible photochromic devices.The synthetic procedure is simple and has promises to be extended to developing other hydrogels with various new functionalities. | Na Liu Sai Liu Fengxia Geng | 2018 | Journal of Materiomics2018，4，2： | 2 |
| 4 | Macroscopic MXene ribbon with oriented sheet stacking for high‐performance flexible supercapacitors显示文摘Flexible and wearable fiber electrodes with high conductivity and acceptable electrochemical behavior are crucial for extending the application of nextgeneration portable electronics,the development of which,however,is very challenging.Two‐dimensional sheets are known to be excellent units for assembling fiber entities,particularly when sheets are oriented in a stacking manner,which helps integrate their intrinsic in‐plane advantages,especially those related with mechanical and electronic performances.In this study,we developed a flexible macroscopic and continuous fiber in an unusual ribbon shape composed solely of Ti3C2 sheets,a typical member of the MXene family.The ribbon morphology was realized through highly ordered stacking of Ti3C2,which imparts fibers with favorable mechanical characteristics.Based on the intrinsic metallic conductivity of Ti3C2 sheets and the oriented stacking structure,the developed macroscopic ribbon exhibited excellent conductivity for both electrons(up to 2458 S/cm)and ions.A fiber‐shaped asymmetric supercapacitor using the developed macroscopic ribbon as a cathode coupled with reduced graphene oxide fibers as an anode delivered a competitive maximum volumetric energy density of 58.4mWh/cm3(20.0Wh/kg)while maintaining a power level of 1679.0mW/cm3(581.0 W/kg)and excellent cycling stability(92.4%retention after 10000 cycles at 10 A/g).This study highlights the excellent potential of MXene as a platform for macroscopic assembly and definitely broadens the applications of MXene materials in wearable electronics. | Chao Zhu Fengxia Geng | 2021 | Carbon Energy2021，3，1： | 2 |
| 5 | General synthesis and structural evolution of a layered family of Ln8 (OH)20C14 -nH20 (Ln= Nd,Sm, Eu,Gd, Tb,Dy, Ho, Er,Tm,and Y)显示文摘 | Geng Fengxia Matsushita Y Sasaki T | 2008 | J Am Chem Soc2008，130，16： | 1 |
| 6 | New layered rare-earth hydroxides with anion-exchange properties 显示文摘 | Geng Fengxia Hao Xin Sasaki T | 2008 | Chem EurJ2008，14，： | 1 |
| 7 | Tetrabutylphosphonium ions as a new swelling/de- lamination agent for layered compounds显示文摘 | GENG Fengxia MA Renzhi YAMAUCHI Y | 2014 | Chemical Communications2014，50，69： | 1 |
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