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One stone two birds:vanadium doping as dual roles in self-reduced Pt clusters and accelerated water splitting

Journal of Energy Chemistry 2022年第3期31卷 493-501,I0014页

作者： Yihan Feng Zichuang Li Shanlin Li Minghui Yang Ruguang Ma Jiacheng Wang State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201ZhejiangChina

Integrating active Pt clusters into transition-metal oxides with water-dissociation ability is effective to prepare a bifunctional electrocatalyst for water splitting in ***,the additional utilization of a reductant and/or the operation at the elevating temperature causes the over-growth and agglomeration of Pt clusters,thus losing the high catalytic ***,we report that v dopant not only favors self-reducing Pt clusters on Ni Fe layered double hydroxide(LDH)(Pt/NiFev)at room temperature,but also regulates interfacial charge redistribution to enhance the water-splitting *** and theoretical studies reveal that v dopant into Ni Fe LDH triggers more electrons to transfer to adjacent Fe atoms,thus leading to a higher reducing ability compared to that without *** used as water-splitting electrocatalyst,v doping promotes electron loss of Pt clusters in Pt/Ni Fe v,optimizing the free energy of hydrogen adsorption and proton recombination kinetics at the ***,it also moves the d-band center of Ni away from the Fermi level to optimize the adsorption of*OH intermediates and facilitate the desorption of oxygen molecules at the ***,Pt/Ni Fe v exhibits much higher bifunctional performance than v-free Pt/Ni Fe LDH toward both the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).This work can spark inspiration of designing other bifunctional electrocatalysts for energy conversion and storage.

关键词： v doping Self-reduction Interfacial charge redistribution Water splitting DFT calculation

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Multiscale manipulating induced flexible heterogeneous v-NiFe_(2)O_(4)@Ni_(2)P electrocatalyst for efficient and durable oxygen evolution reaction

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Nano Research 2022年第6期15卷 4942-4949页

作者： Siran Xu Xin Yu Li Luo Wenjing Li Yeshuang Du Qingquan Kong Qi Wu Hubei Key Laboratory of Pollutant Analysis&Reuse Technology College of Chemistry and Chemical EngineeringHubei Normal UniversityHuangshi 435002China College of Mechanical Engineering Chengdu UniversityChengdu 610106China

Water electrolysis is severely impeded by the kinetically sluggish oxygen evolution reaction(OER)due to its inherent multistep four-electron transfer ***,designing advanced OER electrocatalysts with abundant active sites,robust stability,and low cost remains a huge ***,a facile and versatile multiscale manipulating strategy was proposed to construct a novel v-NiFe_(2)O_(4)@Ni_(2)P heterostructure self-supported on Ni foam(v-NiFe_(2)O_(4)@Ni_(2)P/NF).In such unique architecture,the intrinsic OER catalytic activity was greatly boosted by the in-situ generated heterogeneous Ni_(2)P phase induced by precisely selective phosphorylation of the NiFe-precursor,while the synchronous metal v doping stimulated the activity via modulating the electronic configuration,thus synergistically promoting its OER *** addition,the binder-free catalyst built from three-dimensional(3D)nanosheet arrays(NSs)can offer a large active surface for efficient charge/mass transfer and a robust scaffold for the integrated *** as-prepared flexible electrode exhibited superior OER activity with an ultra-low overpotential of 230 mv at 50 mA·cm^(−2)and outstanding long-term stability for 40 *** discovery is expected to provide an opportunity to explore efficient and stable commercial materials for scalable,efficient,and robust electrochemical hydrogen(H_(2))production.

关键词： oxygen evolution reaction(OER) v doping binder-free catalyst large active surface

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Physical properties and phase diagram of NaFe_(1-x)v_(x)As

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Chinese Physics B 2021年第1期30卷 100-103页

作者： Guang-Yang Dai Xin He Zhi-Wen Li Chang-Ling Zhang Lu-Chuan Shi Run-Ze Yu Xian-Cheng Wang Chang-Qing Jin Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Materials Research Laboratory at Songshan Lake Dongguan 523808China

We grew a series of NaFe_(1-x)v_(x) As(0 ≤ x ≤ 0.03) single crystals and performed the measurements of resistance,magnetic susceptibility, and specific heat to study the superconducting phase diagram by doping v into Na Fe As. Both the structural and the spin-density-wave(SDW) transitions are slightly suppressed by v-doping. While superconducting transition temperature is enhanced to the maximum value of 15 K when the optimal doping level x = 0.007 and then is suppressed rapidly with further v-doping, displaying a small superconducting dome. Our results suggest that v-impurities should act as strong magnetic scattering centers which cause the sharp suppression of superconductivity in NaFe_(1-x)v_(x) As.

关键词： iron based superconductor "111"type NaFeAs v doping phase diagram

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Preparation of v-doped TiO_2 Photocatalysts by the Solution Combustion Method and Their visible Light Photocatalysis Activities

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 863-868页

作者：马晓薛丽红 YIN Shengming YANG Miao YAN Youwei State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology

A series of nanocrystalline v-doped （0.0-3.0 at.%） TiO2 catalysts have been successfully prepared by the one-step solution combustion method using urea as a fuel. The obtained powders were characterized by XRD, SEM, Raman, XPS and Uv-vis DRS. The effects of v doping concentration on the phase structure and photocatalytic properties were investigated. XRD, Raman, and XPS show that v doping diffuses into TiO2 crystal lattice mainly in the form of v5＋ and causes a phase transition from anatase to mille. v doping can widen the light absorption range of TiO2, with the absorption threshold wavelength shifting from 425 to 625 nm. The photocatalytic activity of v-doped TiO2 powders were evaluated by the photocatalytic degradation of methyl orange （MO） under visible light irradiation. It is found that v doping enhances the photoeatalyilc activity under visible light irradiation and the optimal degradation rate of MO is about 95.8% with 1.0 at% v-doped TiO2.

关键词： solution combustion titanium dioxide v doping photocatalyst

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Defect engineering on BiFeO_(3) through Na and v codoping for aqueous Na-ion capacitors

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Journal of Energy Chemistry 2024年第3期90卷 453-463,I0011页

作者： Wenyun Wang Chao Yang Shangjing Yu Daotong Han Wentao Qi Rui Ling Guangqiang Liu School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165ShandongChina

Sodium with low cost and high abundance is considered as a substitute element of lithium for batteries and supercapacitors,which need the appropriate host materials to accommodate the relatively large Na^(+) *** to Li^(+) storage,Na^(+) storage makes higher demands on the structural optimization of perovskite bismuth ferrite(BiFeO_(3)).We propose a novel strategy of defect engineering on BiFeO_(3) through Na and v codoping for high-efficiency Na^(+) storage,to reveal the roles of oxygen vacancies and v ions played in the enhanced electrochemical energy storage performances of Na-ion *** formation of the oxygen vacancies in the Na and v codoped BiFeO_(3)(denoted as Nv-BFO),is promoted by Na doping and suppressed by v doping,which can be demonstrated by XPS and EPR *** the first-principles calculations,the oxygen vacancies and v ions in Nv-BFO are confirmed to substantially lower the Na^(+)migration energy barriers through the space and electric field effects,to effectively promote the Na^(+) transport in the *** kinetic analysis of the Nv-BFO//Nv-BFO capacitors indicates the dominant capacitive-controlled capacity,which depends on fast Na^(+) deintercalation-intercalation process in the Nv-BFO *** Nv-BFO//Nv-BFO capacitors open up a new avenue for developing highperformance Na-ion capacitors.

关键词： BiFeO_(3) Na^(+) storage v doping Oxygen vacancy Capacitor

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Antibacterial Properties of v-doped Titanium-bearing Blast Furnace Slag Prepared at Different Calcination Temperatures

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过程工程学报 2010年第5期10卷 1025-1029页

作者：王辉杨合薛向欣刘东 School of Materials and Metallurgy Northeastern University

Perovskite-type v-doped titanium-bearing blast furnace slag (vTBBFS) photocatalyst was prepared by high-temperature solid phase *** influence of calcination temperature on the photocatalytic and antibacterial properties of vTBBFS was studied in *** composition and microstructure were evaluated by X-ray diffractometer,ultraviolet-visible absorption spectrometer,Fourier transform infrared spectrometer and scanning electron *** antibacterial properties of vTBBFS to Candida albicans were investigated by flask oscillation *** results showed that the optical absorption and antibacterial properties of vTBBFS were the best with 10%(ω) doping of vanadium,prepared at 800℃ for 2 h,and its sterilization rate was close to 100% to Candida albicans (ATCC10231).The minimum inhibitory and minimum bactericidal concentrations were 25 and 50 mg/*** the concentration was 0.2 μg/mL,the catalyst had the least toxic toxicity.

关键词： v doping titanium-bearing blast furnace slag photocatalyst antibacterial activity calcination temperature

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