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Defect engineering of W^(6+)-doped nio for high-performance black smart windows

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Nano Research 2024年第4期17卷 3043-3052页

作者： Yingjun Xiao Xiang Zhang Dukang Yan Jianbo Deng Mingjun Chen Hulin Zhang Wenhai Sun Jiupeng Zhao Yao Li School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150001China

In this report,W^(6+)doping as a defect engineering strategy has been proposed to improve the electrochromic properties of nio film.Further research was conducted to explore the electrochromic properties and the modified mechanism of W-doped nio film.Compared to the pure nio,W-doped nio film exhibits improved electrochromic properties with significant optical modulation(61.56%at 550 nm),fast switching speed(4.42 s/1.40 s for coloring/bleaching),high coloration efficiency(45.41 cm^(2)·C-1)and outstanding cycling stability(no significant attenuation after 2000 cycles)in Li-based electrolytes.Density functional theory(DFT)calculations combined with the experimental results indicate that the improved electrochromic properties were due to enhanced the electronic conductivity and ion conductivity after the introduction of W^(6+).The charge capacity of W-doped nio has also been improved,and it can function with WO_(3) to achieve a high performance black electrochromic smart window(ECSW)by balancing charge.This work could advance the fundamental understanding of defect engineering as an effective strategy to boost the electrochromic properties of nio anodic material,manifesting a significant development as a candidate counter electrode in high-performance black smart windows.

关键词： nio defect engineering charge balance black electrochromic windows

无真空、低成本Mist-CVD外延制备高质量单晶nio/Ga_(2)O_(3)p-n异质结与器件

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Science China Materials 2024年第5期67卷 1646-1653页

作者：张泽雨林宋庆文刘丁赫闫奕如陈昊穆昌根陈大正冯倩张进成张玉明郝跃张春福 National Key Laboratory of Wide Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an710071China

在氧化镓(Ga_(2)O_(3))材料p型掺杂困难的背景下,Ga_(2)O_(3)p-n异质结器件在氧化镓器件的应用中起着重要作用.因此,寻找一种高效、经济的制备方法制备Ga_(2)O_(3)异质结对器件应用具有重要意义.在这项工作中,我们成功基于低成本、无真... 详细信息

在氧化镓(Ga_(2)O_(3))材料p型掺杂困难的背景下,Ga_(2)O_(3)p-n异质结器件在氧化镓器件的应用中起着重要作用.因此,寻找一种高效、经济的制备方法制备Ga_(2)O_(3)异质结对器件应用具有重要意义.在这项工作中,我们成功基于低成本、无真空的雾化学气相沉积(Mist-CVD)外延制备了单晶氧化镍(nio)和β-Ga_(2)O_(3)异质结.其中,nio(111)和β-Ga_(2)O_(3)(-201)的XRD摇摆曲线半高宽分别为0.077°和0.807°.nio与β-Ga_(2)O_(3)之间的能带表现为Ⅱ型异质结构.基于此异质结,我们制备了准垂直器件,器件具有明显的p-n结整流特性,反向击穿电压为117 V.本工作为β-Ga_(2)O_(3)异质p-n结的制备提供了一种低成本、高质量的方法.

关键词： β-Ga_(2)O_(3) heterojunction structure p-n junctions nio mist-CVD

基于β-Ga_(2)O_(3)/nio异质结日盲光电探测器性能研究

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电子元件与材料 2024年第5期43卷 528-537页

作者：关幼幼陈海峰郭天翔陆芹刘祥泰西安邮电大学电子工程学院陕西西安710121

采用原子层沉积法(ALD)在氧化硅衬底上沉积厚度为60 nm的氧化镓(Ga_(2)O_(3))薄膜,制备基于β-Ga_(2)O_(3)/nio异质结结构的日盲光电探测器,研究器件的电极间距(d)、薄膜退火温度和欧姆退火温度对其光电性能的影响。研究结果显示,随着d... 详细信息

采用原子层沉积法(ALD)在氧化硅衬底上沉积厚度为60 nm的氧化镓(Ga_(2)O_(3))薄膜,制备基于β-Ga_(2)O_(3)/nio异质结结构的日盲光电探测器,研究器件的电极间距(d)、薄膜退火温度和欧姆退火温度对其光电性能的影响。研究结果显示,随着d从30μm缩短至10μm时,器件的光电流(Iphoto)、暗电流(Idark)、光响应度(R)、外部量子效率(EQE)和比探测率(D^(*))增大,上升时间(τr)和下降时间(τd)缩短。随着薄膜退火温度从500℃升至900℃时,器件的Iphoto、Idark、R、 EQE和D^(*)增大,τr和τd缩短。随着欧姆退火温度从350℃升至550℃时,Iphoto、Idark、R和EQE增大,τr和τd缩短。研究表明器件的光电性能在d为10μm、薄膜退火温度为900℃且欧姆退火温度为550℃的条件下最优,在10 V偏压时对应的光暗电流比(PDCR)为1802.63,R为5.27×10^(2)A/W,EQE为257587.76%,D^(*)为5.45×10^(13)Jones。

关键词： β-Ga2O3 原子层沉积 nio 异质结光电探测器退火温度

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介孔nio的制备及其胺化苯制苯胺

合成化学 2024年

作者：林笑寒田宝郭明慧刘靖婷夏云生渤海大学化学与材料工程学院

传统的苯胺合成方法步骤多，条件苛刻，污染环境。选用草酸和硝酸镍为原料，通过一步直接热分解固体混合物过程，制得高比表面积的蠕虫孔状nio催化剂，采用XRD、 TEM、 SEM和N2吸-脱附技术表征了催化剂的物化性质，考察了以介孔nio为催... 详细信息

传统的苯胺合成方法步骤多，条件苛刻，污染环境。选用草酸和硝酸镍为原料，通过一步直接热分解固体混合物过程，制得高比表面积的蠕虫孔状nio催化剂，采用XRD、 TEM、 SEM和N2吸-脱附技术表征了催化剂的物化性质，考察了以介孔nio为催化剂、过氧化氢为氧化剂、氨水为胺化剂胺化苯一步合成苯胺。结果表明：热分解温度及原料配比影响介孔nio粒子的结构；等物质的量之比的草酸和硝酸镍在400 ℃分解制得的介孔nio催化剂（N4），在实验条件下可获得的苯胺最高收率为0.1%（5 mL原料苯制得4.7 mg苯胺），这与催化剂的高比表面积、发达的孔道结构和晶化物种的分散性有关。尽管苯胺收率不高，但介孔nio催化剂的制备方法简便且具有普适性，并在温和条件下一步合成了苯胺，为探索高效、绿色合成苯胺新方法提供参考。

关键词：介孔材料 nio 胺化苯苯胺

nio nanoparticles-decorated ZnO hierarchical structures for isopropanol gas sensing

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Rare Metals 2022年第3期41卷 960-971页

作者： Shi-Chao Wang Xiao-Hu Wang Gao-Qun Qiao Xiao-Yan Chen Xin-Zhen Wang Nan-Nan Wu Jian Tian Hong-Zhi Cui School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

In this paper,a three-dimensional(3D)hierar-chical ZnO structure consisting of nanosheets modified with ultrafine nio particles was synthesized via a facile two-step chemical precipitate method.Various techniques characterized the as-synthesized ZnO/nio composites and pure ZnO.The p-nio/n-ZnO junctions formed between adjacent ZnO and nio nanoparticles,improving the gas sensing performance.The ZnO/nio composite with the Ni:Zn atomic ratio of 7.42:100 exhibited the best iso-propanol sensing properties.Compared to pure ZnO,it showed high selectivity and sensitivity(R_(a)/R_(g)=221.3 toward 400×10^(-6)isopropanol),fast response rate(less than 10 s),short recovery time,and simultaneously low operating temperature.Also,the ZnO/nio composite exhibited a wide sensing range(1×10^(-6)-1000×10^(-6))to isopropanol and processed good long-term stability.The experimental results suggested the potential application in fabricating efficient isopropanol sensors using this ZnO/nio composite.The enhanced isopropanol sensing mech-anism is also discussed in charge transfer between heterojunctions,surface area,and surface defects.

关键词： ZnO nio Hierarchical structure Gas sensor Isopropanol

Ternary Metal–Organic Framework Derived 2D Fe_(2)O_(3)/Co_(3)O_(4)/nio/NC Heterostructured Nanosheets for Super Lithium Storage

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1376-1382页

作者： Yongjun Zheng Rui Sun Zhaoxia Qin Xinlong Liu Yufei Zhang Haibin Wang Haosen Fan School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China College of Civil Aviation Safety Engineering Civil Aviation Flight University of ChinaGuanghan 618307China

Fe_(2)O_(3)/Co_(3)O_(4)/nio/NC nanosheets have been successfully prepared via a two-step annealing process of ternary metal coordination polymer. Attributing to the synergistic effects of the multiple metal oxides and the unique 2D nanosheet structure, the improved electrical conductivity and effective electron/ion transfer enables Fe_(2)O_(3)/Co_(3)O_(4)/nio/NC electrode to exhibit excellent electrochemical properties with outstanding rate capacity and cycling stability. This work may pave the way to construct ternary metal oxide electrode material with an excellent electrochemical performance by introducing multiple metal oxides.

关键词： Nanosheets Ternary metal-organic framework Lithium-ion batteries Fe_(2)O_(3) Co_(3)O_(4) nio NC Ternary metal oxide

Hierarchical porous nio as a noble-metal-free cocatalyst for enhanced photocatalytic H_(2) production of nitrogen-deficient g-C_(3)N_(4)

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Rare Metals 2022年第2期41卷 396-405页

作者： Yu-Wei Liao Jing Yang Guo-Hong Wang Juan Wang Kai Wang Su-Ding Yan College of Chemistry and Chemical Engineering Hubei Normal UniversityHuangshi 435002China Hubei Key Laboratory of Pollutant Analysis and Reuse Technology Hubei Normal UniversityHuangshi 435002China

Graphitic carbon nitride with nitrogen vacancies(NV-g-C_(3)N_(4))as a photocatalyst has been studied in solardriven energy conversion.However,expensive and rare noble metal co-catalysts such as Pt or Pd are required in the photocatalytic H_(2)evolution.Consequently,the exploration of low-cost and high-performance co-catalysts to replace expensive and rare noble metals has received more and more attention.Herein,a novel hierarchical porous nio anchored on NV-g-C_(3)N_(4)is successfully fabricated.The NV-g-C_(3)N_(4)/nio photocatalysts exhibited outstanding H_(2)evolution rate under visible light irradiation in absence of noble metal cocatalysts.The optimized NV-g-C_(3)N_(4)/nio(the mass ratio of nio is*1.7%)achieved a maximum H2 evolution rate of 170.60 lmol·g^(-1)·h^(-1),exhibiting*8.3-fold enhancement as compared to that of NV-g-C3N4.nio as co-catalyst provided more active sites for photocatalytic H2 evolution.Moreover,on the interface of NV-g-C_(3)N_(4)/nio,an interface electric field is formed between nio and host nitrogen-vacated g-C3N4,facilitating the transfer of the photogenerated electrons from NV-g-C_(3)N_(4)to nio co-catalyst,resulting in significantly promoted migration and separation efficiency of the photogenerated charge carriers.

关键词： Graphitic carbon nitride Hierarchical porous nio Photocatalysis H_(2)evolution

An efficient electrocatalytic system composed of nickel oxide and nitroxyl radical for the oxidation of bio-platform molecules to dicarboxylic acids

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Journal of Energy Chemistry 2023年第5期80卷 58-67,I0003页

作者： Kai Zhang Zixiang Zhan Minzhi Zhu Haiwei Lai Xiangyang He Weiping Deng Qinghong Zhang Ye Wang State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsInnovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

Selective oxidation of biomass and its derivatives to dicarboxylic acids represents a promising route for biomass valorization.However,the co-presence of multiple functional groups in biomass molecules makes the selective oxidation of particular functional a challenging task.Here,we demonstrate an efficient electrocatalytic system consisting of nickel oxide(nio)and a nitroxyl radical,i.e.,2,2,6,6-tetrame thylpiperidine-1-oxyl(TEMPO)or 4-acetamido-TEMPO(ACT),for the selective oxidation of key bioplatform molecules including glucose,xylose and 5-hydroxymethylfurfural(HMF)into corresponding dicarboxylic acids,i.e.,glucaric acid,xylaric acid,and 2,5-furandicarboxylic acid(FDCA).nio is clarified as the active catalyst for the oxidation of aldehyde in bio-platform molecules to carboxylic acid,while TEMPO or ACT is responsible for the oxidation of primary alcohol to aldehyde.The combination of nio and TEMPO or ACT significantly accelerated the tandem oxidation of aldehyde and hydroxyl groups in glucose,xylose and HMF,thus achieving excellent yields(83%-99%)of dicarboxylic acids.Moreover,the combination catalyst enables the selective oxidation of glucose and xylose with high concentrations(e.g.,20 wt%),which offers a promising strategy for biomass valorization.

关键词： Biomass Electrocatalysis nio Nitroxyl radical Dicarboxylic acid

Low temperature conversion of methane to syngas using lattice oxygen over nio-MgO

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Chinese Chemical Letters 2022年第10期33卷 4687-4690页

作者： Junbu Wang Zeai Huang Ying Wang Jundao Wu Zhiqiang Rao Fang Wang Ying Zhou State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Institute of Carbon neutrality&School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China

The conversion of methane to syngas(H_(2) and CO)is an important route to produce high value-added products.Oxidize methane into syngas in the absence of gaseous oxidants is an economical route.In this work,nio-MgO composite is successfully synthesized via an impregnation method.At 764 K,methane is directly converted to syngas on the nio-MgO without gaseous oxidants.A synergistic effect of nio and MgO was observed,in which nio induced lattice oxygen of MgO mobility to oxidize methane and suppressed the formation of intermediates for side reaction.As a result,nio-MgO exhibited enhancement of catalytic activity with the H2 production rate of 1241.0µmol g^(-1) min^(-1),which was 3.4 times higher than that of pure MgO.This work provides a direct guidance to understand of methane oxidation via lattice oxygen under low temperature(<773 K).

关键词： Methane Lattice oxygen Syngas Hydrogen nio