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Construction of phosphorus-doping with spontaneously developed selenium vacancies: Inducing superior ion-diffusion kinetics in hollow Cu_(2)Se@C nanospheres for efficient sodium storage

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Journal of Energy Chemistry 2023年第2期77卷 227-238,I0007页

作者： Xiaoqing Ma Yadong Li Xiaojiang Long Hong-chuan Luo Chunping Xu Guangzhao Wang Wenxi Zhao School of Chemistry and Chemical Engineering Yangtze Normal UniversityChongqing 408100China Sports Medicine Center Department of Orthopedic SurgerySouthwest Hospitalthe 3rd Military Medical UniversityChongqing 400038China School of Electronic Information Engineering Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of ChongqingYangtze Normal UniversityChongqing 408100China Postgraduate Admission Office of Graduate School Southwest UniversityChongqing 400715China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua 617000SichuanChina

Achieving high-efficiency sodium storage in metal selenides is still severely constrained in consideration of their inferior electronic conductivity and inadequate Na^(+)insertion pathways and active *** doping accompanied by spontaneously developed lattice defects can effectively tune electronic structure of metal selenides,which give a strong effect to motivate fast charge transfer and Na^(+)***,we finely designed and successfully constructed a fascinating phosphorus-doped Cu_(2)Se@C hollow nanosphere with abundant vacancy defects(Cu_(2)P_(x)Se_(1-x)@C)through a combination strategy of selenization of Cu_(2)O nanosphere template,self-polymerization of dopamine,and subsequent phosphorization *** exquisite composite possesses enriched active sites,superior conductivity,and sufficient Na^(+)insertion channel,which enable much faster Na^(+)diffusion rates and more remarkable pseudocapacitive features,Satisfyingly,the Cu_(2)P_(x)Se_(1-x)@C composites manifest the supernormal sodium-storage capabilities,that is,a reversible capacity of 403.7 mA h g^(-1) at 1.0 A g^(-1) over 100 cycles,and an ultrastable cyclic lifespan over 1000 cycles at 20.0 A g^(-1) with a high capacity-retention of about249.7 mA h g^(-1).The phase transformation of the Cu_(2)P_(x)Se_(1-x)@C involving the intercalation of Na^(+)into Cu_(2)Se and the following conversion of NaCuSe to Cu and Na2Se were further demonstrated through a series of ex-situ characterization *** results demonstrate that the coexistence of phosphorusdoping and vacancy defects within Cu_(2)Se results in the reduction of Na^(+)adsorption energy from-1.47to-1.56 eV improving the conductivity of Cu_(2)Se to further accelerate fast Na^(+)mobility.

关键词： phosphorus-doping Selenium vacancies Hollow Cu_(2)Se@C nanospheres Anode Sodium storage

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phosphorus-doped Ni–Co sulfides connected by carbon nanotubes for flexible hybrid supercapacitor

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Frontiers of Chemical Science and Engineering 2023年第5期17卷 491-503页

作者： Shengwang Su Li Sun Feng Xie Jialong Qian Yihe Zhang Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China

As promising electrode materials for supercapacitors,nickel-cobalt bimetallic sulfides render the advantages of abundant redox reactions and inherently high ***,in general,unsatisfactory performance of low specific capacity,low rate capability,and fast capacity loss exist in Ni–Co sulfide ***,we rationally regulate phosphorus-doped nickel–cobalt sulfides(P-NCS)to enhance the electrochemical performance by gas–solid ***,carbon nanotubes(CNTs)as conductive additives are added to improve the cycle stability and conductivity and form the composite P-NCS/C/*** to density functional theory,more electrons near the Fermi surface of P-NCS are demonstrated notionally than those of simple *** results manifest that P-NCS/C/CNT exhibits superior electrochemical performance,e.g.,high specific capacity(932.0 C·g^(-1)at 1 A·g^(-1)),remarkable rate capability(capacity retention ratio of 69.1%at 20 A·g^(-1)),and lower charge transfer *** importantly,the flexible hybrid asymmetric supercapacitor is assembled using P-NCS/C/CNT and activated carbon,which renders an energy density of 34.875 W·h∙kg^(-1)at a power density of 375 W∙kg^(-1).These results show that as-prepared P-NCS/C/CNT demonstrates incredible possibility as a battery-type electrode for high-performance supercapacitors.

关键词： cobalt nickel sulfide phosphorus-doping hybrid supercapacitor carbon nanotube density functional theory

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The synergistic effect of P-doping and carbon coating for boosting electrochemical performance of TiO_(2) nanospheres for sodium-ion batteries

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Chinese Chemical Letters 2021年第12期32卷 3847-3851页

作者： Zixing Guan Kaixiang Zou Xiao Wang Yuanfu Deng Guohua Chen The Key Laboratory of Fuel Cell for Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Electrochemical Energy Engineering Research Center of Guangdong Province South China University of TechnologyGuangzhou 510640China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

P-doping is an effective way to modulate the electronic structure and improve the Na+diffusion kinetics of TiO_(2), enabling enhanced electrochemical performance. However, it is a challenge to prepare TiO;with a high P-doping concentration starting from TiO_(2)in a crystalline state. In this work, we design a novel two-step route for constructing a carbon-coated anatase P-doping TiO_(2)nanospheres(denote as(PAn TSS)@NC) with high P-doping concentration, by utilizing amorphous TiO;nanospheres with the ultrahigh specific area as P-doping precursor firstly, and followed by carbon coating treatment. Experimental results demonstrate that P is successfully doped into the crystal lattice and carbon layer is well coated on the surface of TiO_(2), with P-doping and carbon-coating contents of ~13.5 wt% and 10.4 wt%, respectively,which results in the enhanced pseudocapacitive behavior as well as favorable Na+and electron transferring kinetics. The(P-AnTSS)@NC sample shows excellent rate and cycle performance, exhibiting specific capacities of 177 and 115 m Ah/g at 0.1 and 1.0 A/g after 150 and 2000 cycles, respectively.

关键词： TiO_(2) phosphorus-doping Carbon coating layer Anode material Sodium-ion batteries

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P-Doped Titania Xerogels as Efficient UV-Visible Photocatalysts

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Journal of Materials Science and Chemical Engineering 2014年第8期2卷 17-32页

作者： Céline J.Bodson Sophie L.Pirard René Pirard Ludivine Tasseroul Catherine Bied Michel Wong Chi Man Benoit Heinrichs Stéphanie D.Lambert Laboratory of Chemical Engineering—Nanomaterials CatalysisElectrochemistryUniversity of LiegeLiegeBelgium Charles Gerhardt Montpellier Institute(UMR5253 CNRS-UM2-ENSCM-UM1) MontpellierFrance

In the present study, sol-gel process is used to synthesize P-doped TiO2 xerogels by the cogelation method of a functionalized P alkoxide, (NH2-(CH2)2-NH-(CH2)2-P(O)-(OC2H5)2) with Ti(OC3H7)4 in either 2-methoxyethanol or isopropanol. The phosphorus-doping improved the thermal stability of titania and decreased the phase transformation of anatase into rutile. This modification by phosphorus shifted the absorption edge of titania to the visible region as proved by Diffuse reflectance measurements, and thus offers the possibility to produce visible light effective TiO2 photocatalyst. The excellent photocatalytic activity of P-doped TiO2 xerogels compared to pure TiO2 could be explained by its high surface area and small TiO2-anatase crystallite size. From these results, it was proved by using three different models that phosphorus intrinsically influences the photocatalytic activity.

关键词： TiO_(2) xerogel phosphorus-doping Sol-Gel p-Nitrophenol Degradation Photocatalysis

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