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Tailoring interfacial electron redistribution of Ni/Fe_(3)O_(4) electrocatalysts for superior overall water splitting

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Journal of Energy Chemistry 2022年第10期31卷 330-338,I0008页

作者： Wenli Xu Wenda Zhong Chenfan Yang Rong Zhao Jing Wu xuanke li Nianjun Yang Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082HunanChina Institute of Materials Engineering University of SiegenSiegen 57076Germany

Exploring highly active earth-abundant bifu nctional electrocatalysts for water splitting at a high output is essential for the forthcoming hydrogen economy.Non-noble Fe_(3)O_(4) catalyst owns outstanding conductivity and its octahedral Fe sites can markedly promote water dissociation.However,it lacks active centers on the surface,resulting in its poor activity when used as a catalyst for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Herein,an electron redistribution strategy is proposed by introducing Ni sites onto the surface of Fe_(3)O_(4)(Ni/Fe_(3)O_(4)).The abundant delocalized electrons,derived from the electronic interaction of Ni and Fe_(3)O_(4) species,significantly optimize the electronic structure of the Ni/Fe_(3)O_(4) catalyst,leading to its improved adsorption behavior.This Ni/Fe_(3)O_(4) catalyst exhibits remarkable bifunctional activity,steadily outputting 1000 mA cm^(-2)at the low overpotential of 387 mV for HER and 338 mV for OER,respectively.Using Ni/Fe_(3)O_(4) as a bifunctional catalyst for overall water splitting reaction exhibits the optimal performance with outstanding stability,obtaining a current density of1000 mA cm^(-2)at 1.98 V,much superior to a Pt/C‖IrO_(2)cell.Experimental analysis and theoretical calculations collectively corroborate that the electron redistribution of Fe_(3)O_(4) is activated by coupling Ni species,leading to the promoted HER and OER kinetics.This electron redistribution strategy provides an effective method to activate transition metal-based catalysts which are promising to be utilized as superior electrocatalysts for the industrial overall water splitting reaction.

关键词： Electron redistribution Ni/Fe_(3)O_(4)heterojunction Overall water splitting

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Tailoring synergetic catalytic interface of VPO/Ni_(2)P to boost hydrogen evolution under alkaline conditions

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Journal of Energy Chemistry 2022年第2期31卷 674-680页

作者： Wenli Xu Qiqi li Wenda Zhong Bing Sun Qiang Huang Xu Nan Yinhong Gao Yao Yang Qin Zhang Nianjun Yang xuanke li School of Chemistry and Chemical Engineering Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082HunanChina Institute of Materials Engineering University of SiegenSiegen 57076Germany

Design of the catalyst for efficient water dissociation and hydrogen recombination is paramount in enhancement of the alkaline water electrolysis kinetics.Herein,we reported a delicate hierarchical(VO)_(2) P_(2)O_(7)-Ni_(2) P@NF(VPO-Ni_(2) P@NF)hybrid catalyst that operated efficiently in alkaline media.The VPO and Ni_(2) P respectively act as the water dissociation promoter and the hydrogen recombination center,which synergistically propel water adsorption/dissociation and H intermediates recombination.The resulting synergistic interfaces between VPO and Ni_(2) P are verified to afford the catalyst an outstanding performance for hydrogen evolution reaction in alkaline media with an overpotential of 154 mV at 10 mA cm^(-2),Tafel slope of 65 mV dec^(-1),and remarkable durability.Furthermore,the catalyst presents the potential for overall water splitting.This work may shed fresh light on the high-performance electrocatalyst design and the application of VPO on water electrolysis.

关键词： Alkaline water electrolysis Interface engineering (VO)_(2)P_(2)O_(7) Ni_(2)P

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Interfacial electron rearrangement: Ni activated Ni(OH)_(2) for efficient hydrogen evolution

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Journal of Energy Chemistry 2021年第10期30卷 236-242,I0007页

作者： Wenda Zhong Wenlong li Chenfan Yang Jing Wu Rong Zhao Memona Idrees Hui Xiang Qin Zhang xuanke li Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and EngineeringHunan UniversityChangsha 410082HunanChina Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081HubeiChina

The rational modulation of electronic structure is highly desirable to develop an efficient alkaline hydrogen evolution reaction(HER)catalyst for renewable energy applications.Metal hydroxide such as Ni(OH)_(2) has been proven useful for promoting alkaline HER,but the performance remains unsatisfactory.Herein,the electronic structure of Ni(OH)_(2) is modulated by the interfacial electron rearrangement between Ni-Ni(OH)_(2) heterojunction.Combined experiments with DFT simulations,the electrons of Ni species accumulate to the interfacial Ni-Ni(OH)_(2) sites,which modifies the d band center for promoting conversion of hydrogen intermediates and narrows the energy gap for boosting charge transfer in the HER process.Thus,the integrated electrode exhibits an efficient HER performance to drive10 mA cm^(-2) at the overpotential of 72 mV with a low Tafel slope of 43 mV dec^(-1).Our work renders a valuable insight for understanding and rationally designing efficient catalysts in alkaline HER.

关键词： Electron rearrangement Hydrogen evolution Ni(OH)_(2) Ni Heterojunction

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Ternary BiOBr/TiO2/Ti3C2Tx MXene nanocomposites with heterojunction structure and improved photocatalysis performance

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Chinese Chemical Letters 2020年第4期31卷 1022-1025页

作者： Tianxiang Xu Jiapei Wang Ye Cong Song Jiang Qin Zhang Hui Zhu Yanjun li xuanke li The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials Wuhan University of Science and TechnologyWuhan 430081China

The rational design and construction of heterojunction structure is an effective strategy to improve the photocatalytic performance.Herein,a series of BiOBr nanosheets-immobilized TiO2/Ti3C2Tx MXene hybrid materials with heterojunction structure were synthesized by a facial one-step hydrothermal method.The ternary composites show outstanding performance as photocatalysts for the degradation of rhodamine B due to the optimized synergetic effects of BiOBr,TiO2 and Ti3C2Tx.The improved photocatalytic performance is remarkably attributed to the construction of a heterojunction between TiO2 and BiOBr due to their well-matching of energy band position,which can enhance the absorption for visible light and promote the transfer of photo-generated charge carriers.Moreover,Ti3C2Tx acts as an electron trap to further accelerate the separation of photo-generated electrons and holes.

关键词： MXene BiOBr TiO2 Heterojunction Photocatalytic activity

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Improving the cycle stability of FeCl3-graphite intercalation compounds by polar Fe2O3 trapping in lithium-ion batteries

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Nano Research 2019年第8期12卷 1836-1844页

作者： Zheng li Chengzhi Zhang Fei Han Fuquan Zhang Dianwu Zhou Shaohua Xu Hongbo liu xuanke li Jinshui liu College of Materials Science and Engineering Hunan University Changsha 410082China Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082China

FeCI3-intercalated graphite intercalation compounds (GICs) with high reversible capacity and high volumetric energy density are attractive anode material alternatives of commercial graphite. However, the rapid capacity decay, which was induced by chloride dissolution and shuttling issues, hindered their practical application. To address this problem, here, we introduce flake-like Fe2O3 species with inherently polar surface on the edge of FeCl3 -intercalated GICs through microwave-assisted transformation of a fraction of FeCl3 component. Theoretical simulations and physical/electrochemical studies demonstrate that the introduced Fe2O3 component can afford sufficient polar active sites for chemically bonding the soluble FeCl3 and liCl species based on the polar-polar interaction mechanism, further inhibiting the outward diffusion of the chlorides and immobilizing them within the GIC material. In a lithium ion cell, the FeCl3 -intercalated GIC with a suitable Fe2O3 content shows remarkably improved cycling stability with a high reversible capacity of 1,041 mAh·g^-1 at a current density of 200 mA·g^-1. Capacity retention of 91 % is achieved at a high current density of 1,000 mA·g^-1 over 300 cycles. This work opens up the new prospect for immobilizing chlorides by introducing inorganic species in GIC for long-cycle electrochemical batteries.

关键词： transition metal chloride graphite intercalation compound polar-polar interaction anode lithium ion battery

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播期对桂中晚稻生长发育及产量的影响

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陕西农业科学 2024年第1期70卷 33-36,45页

作者：李宜爽黄维吴炫柯柳州市气象局广西柳州545001 柳州市农业气象试验站广西柳州545003

为探讨播期对桂中地区晚稻生长发育及产量的影响,以野香优莉丝为晚稻试验材料,于2022年在广西柳州市郊沙塘镇沙塘村进行分期播种试验,共设置4个播期,比较了不同播期下晚稻的发育期、株高、干物重及产量的差异性。结果表明:在前期营养阶... 详细信息

为探讨播期对桂中地区晚稻生长发育及产量的影响,以野香优莉丝为晚稻试验材料,于2022年在广西柳州市郊沙塘镇沙塘村进行分期播种试验,共设置4个播期,比较了不同播期下晚稻的发育期、株高、干物重及产量的差异性。结果表明:在前期营养阶段,S1-S4所需时间基本相同,在生殖阶段,S3、S4需时较S1、S2明显变长;S1、S2的株高和地上总干物重明显高于S3、S4,S1、S2的产量因素明显优于S3、S4;然而,S1、S2生长发育及产量形成的各项指标差异不明显。桂中地区晚稻于7月上、中旬播种生长发育及产量差异不大,但在7月下旬播种生长发育较差,产量偏低,甚至有可能绝收,为充分利用光温资源,缓解双抢压力,晚稻在桂中地区于7月中旬播种较佳。

关键词：晚稻桂中地区播期干物重产量

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广西甘蔗产量灾损风险时空变化分析

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甘蔗糖业 2024年第1期53卷 34-45页

作者：黄维李莉吴炫柯李华实邹颖俊何芊姗匡昭敏柳州市气象局/柳州市农业气象试验站广西柳州545003 广西壮族自治区气象科学研究所广西南宁530022 崇左市气象局广西崇左532200 广西中气风云灾防科技有限公司广西南宁530022

通过研究不同时期广西甘蔗产量灾损风险,以期为甘蔗种植防灾减灾和区域发展规划提供重要科学支撑。利用1961~2021年广西甘蔗统计产量,采用趋势产量分离方法、产量灾损风险指数构建方法和GIS空间分析方法,分析不同时期P1(1961~1980年)、P... 详细信息

通过研究不同时期广西甘蔗产量灾损风险,以期为甘蔗种植防灾减灾和区域发展规划提供重要科学支撑。利用1961~2021年广西甘蔗统计产量,采用趋势产量分离方法、产量灾损风险指数构建方法和GIS空间分析方法,分析不同时期P1(1961~1980年)、P2(1981~2000年)和P3(2001~2021年)3个时段内平均减产率、减产率变异系数、不同减产率风险概率以及产量灾损风险指数的空间分布,并讨论不同时期气象灾害与产量灾损风险指数的关系。结果表明:①各时期平均减产率大小为P1>P2>P3,空间上P1时期桂东偏高,P2时期桂北偏高,P3时期全区大部为低减产率;②各时期减产率变异系数大小为P2>P3=P1,P2时期以河池为主的桂北地区偏高,P1和P3时期全区大部为中或低变异系数;③各时期不同减产率风险概率大小为P1>P2>P3,P1和P2时期空间上主要呈东西差异,P3时期全区空间差异较小;④各时期产量灾损风险指数(R)大小为P1>P2>P3,P1时期R大部偏高,P2时期R以河池为主的桂北地区偏高,P3时期大部地区处于低或较低产量灾损风险,并明显低于P1和P2时期。研究结果表明当前气候与生产技术背景下,甘蔗产量灾损风险降低,广西甘蔗生产朝较好方向发展,但仍需注意防范桂西和桂中干旱、桂北低温霜冻等农业气象灾害对甘蔗生产的影响。

关键词：甘蔗产量灾损风险农业气象灾害

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High-spatial-resolution ultrafast framing imaging at 15 trillion frames per second by optical parametric amplification

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Advanced Photonics 2020年第5期2卷 53-63页

作者： xuanke Zeng Shuiqin Zheng Yi Cai Qinggang lin Jinyang liang Xiaowei Lu Jingzhen li Weixin Xie Shixiang Xu Shenzhen University College of Physics and Optoelectronic EngineeringShenzhen Key Lab of Micro-Nano Photonic Information TechnologyShenzhenChina Shenzhen University College of Electronic Information EngineeringShenzhenChina Institut National de la Recherche Scientifique CentreÉnergie Matériaux TélécommunicationsLaboratory of Applied Computational ImagingVarennesQuébecCanada

We report a framing imaging based on noncollinear optical parametric amplification(NCOPA),named FINCOPA,which applies NCOPA for the first time to single-shot ultrafast optical imaging.In an experiment targeting a laser-induced air plasma grating,FINCOPA achieved 50 fs-resolved optical imaging with a spatial resolution of^83 lp∕mm and an effective frame rate of 10 trillion frames per second(Tfps).It has also successfully visualized an ultrafast rotating optical field with an effective frame rate of 15 Tfps.FINCOPA has simultaneously a femtosecond-level temporal resolution and frame interval and a micrometer-level spatial resolution.Combining outstanding spatial and temporal resolutions with an ultrahigh frame rate,FINCOPA will contribute to high-spatiotemporal resolution observations of ultrafast transient events,such as atomic or molecular dynamics in photonic materials,plasma physics,and laser inertial-confinement fusion.

关键词： ultrafast imaging spatiotemporal resolution frame rate noncollinear optical parametric amplification

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燃料电池用碳纸的制备及其石墨化研究

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中国造纸 2023年第12期42卷 9-14页

作者：屈亮李艳军朱辉李保六董志军李轩科武汉科技大学化学与化工学院沥青基先进炭材料湖北省工程研究中心湖北武汉430081

以聚丙烯腈(PAN)基碳纤维无纺布为骨架,通过酚醛树脂乙醇溶液浸渍、模压和碳化,再经不同温度石墨化处理,制备了燃料电池用碳纸。通过现代分析仪器表征碳纸原纸的微观形貌、平面方向电阻率、孔隙分布、拉伸强度等指标,探讨石墨化温度对... 详细信息

以聚丙烯腈(PAN)基碳纤维无纺布为骨架,通过酚醛树脂乙醇溶液浸渍、模压和碳化,再经不同温度石墨化处理,制备了燃料电池用碳纸。通过现代分析仪器表征碳纸原纸的微观形貌、平面方向电阻率、孔隙分布、拉伸强度等指标,探讨石墨化温度对碳纸原纸各项性能的影响。结果表明,在石墨化处理过程中,大块聚集且杂乱无章的树脂炭能够逐渐收缩到碳纤维表面及碳纤维与碳纤维的交结点上,获得较完美的石墨晶体结构。石墨化温度需大于2000℃,才能获得具有较好性能且满足应用要求的碳纸原纸。当石墨化温度为2000℃时,碳纸原纸的平面方向电阻率为19.0 mΩ·cm,拉伸强度达17.8 MPa,孔隙率达79.15%。

关键词：燃料电池碳纤维无纺布碳纸石墨化

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Accurate reconstruction of electric field of ultrashort laser pulse with complete two-step phase-shifting

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High Power Laser Science and Engineering 2019年第1期7卷 92-98页

作者： Yi Cai Zhenkuan Chen Shuiqin Zheng Qinggang lin xuanke Zeng Ying li Jingzhen li Shixiang Xu Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology College of Electronic Science and TechnologyShenzhen University International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong ProvinceShenzhen University

This paper presents a complete two-step phase-shifting(TSPS) spectral phase interferometry for direct electric-field reconstruction(SPIDER) to improve the reconstruction of ultrafast optical fields. Here, complete TSPS acts as a balanced detection that can not only remove the effect of the dc term of the interferogram, but also reduce measurement noises,and thereby improve the capability of SPIDER to measure the pulses with narrow spectra or complex spectral structures.Some prisms are chosen to replace some environment-sensitive optical components, especially reflective optics to improve operating stability and improve signal-to-noise ratio further. Our experiments show that the available shear can be decreased to 1.5% of the spectral width, which is only about 1/3 compared with traditional SPIDER.

关键词： electric-field reconstruction shearing interferometry spectral phase ultrashort laser pulse

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