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Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

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National Science Review 2020年第6期7卷 1059-1067页

作者： Ningsi Zhang Xin Wang Jianyong Feng huiting huang Yongsheng Guo Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Nanjing University Jiangsu Key Laboratory of Nano Technology Nanjing University

Although β-Fe2O3has a high theoretical solar-to-hydrogen efficiency because of its narrow band gap, the study of β-Fe2O3photoanodes for water splitting is elusive as a result of their metastable nature. Raman identification of β-Fe2O3is theoretically and experimentally investigated in this study for the first time, thus clarifying the debate about its Raman spectrum in the literature. Phase transformation of β-Fe2O3toα-Fe2O3was found to potentially take place under laser and electron irradiation as well as ***, phase transformation of β-Fe2O3to α-Fe2O3was inhibited by introduction of Zr doping, andβ-Fe2O3was found to withstand a higher annealing temperature without any phase transformation. The solar water splitting photocurrent of the Zr-doped β-Fe2O3photoanode was increased by 500% compared to that of the pure β-Fe2O3photoanode. Additionally, Zr-doped β-Fe2O3exhibited very good stability during the process of solar water splitting. These results indicate that by improving its thermal stability,metastable β-Fe2O3film is a promising photoanode for solar water splitting.

关键词： solar energy conversion metastable phase phase transformation iron oxide photoelectrochemical water splitting

Advancements in transition bimetal catalysts for electrochemical 5-hydroxymethylfurfural(HMF) oxidation

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Journal of Energy Chemistry 2024年第11期98卷 24-46页

作者： Yuwei Li huiting huang Mingkun Jiang Wanlong Xi Junyuan Duan Marina Ratova Dan Wu Key Laboratory of Green Chemical Engineering Process of Ministry of Education Hubei Key Laboratory of Plasma Chemistry and New MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205HubeiChina Faculty of Science and Engineering Manchester Metropolitan UniversityChester 12 StreetManchester M15GDUK

The electrochemical oxidation of 5-hydroxymethylfurfural(HMF) represents a significant avenue for sustainable chemical synthesis, owing to its potential to generate high-value derivatives from biomass feedstocks. Transition metal catalysts offer a cost-effective alternative to precious metals for catalyzing HMF oxidation, with transition bimetallic catalysts emerging as particularly promising candidates. In this review, we delve into the intricate reaction pathways and electrochemical mechanisms underlying HMF oxidation, emphasizing the pivotal role of transition bimetallic catalysts in enhancing catalytic efficiency. Subsequently, various types of transition bimetallic catalysts are explored, detailing their synthesis methods and structural modulation strategies. By elucidating the mechanisms behind catalyst modification and performance enhancement, this review sets the stage for upcoming advancements in the field, ultimately advancing the electrochemical HMF conversion and facilitating the transition towards sustainable chemical production.

关键词： HMF oxidation Transition metal catalysts Bimetallic catalysts Biomass valorization Electrocatalyst synthesis

Electrolyte manipulation on Cu-based electrocatalysts for electrochemical CO_(2) reduction

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Journal of Energy Chemistry 2024年第12期99卷 201-222页

作者： Hexin Zhou Wanlong Xi Peng Yang huiting huang Jia Tian Marina Ratova Dan Wu Key Laboratory of Green Chemical Engineering Process of Ministry of Education Hubei Key Laboratory of Plasma Chemistry and New MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205HubeiChina Faculty of Science and Engineering Manchester Metropolitan UniversityChester 12 StreetManchester M15GDUK

Electrocatalytic reduction of CO_(2)is crucial for environmental sustainability and renewable energy storage,with Cu-based catalysts excelling in producing high-value C_(2+)***,a comprehensive analysis of how specific electrolyte influences Cu-based catalysts is *** review addresses this gap by focusing on how electrolytes impact surface reconstruction and the CO_(2) reduction process on Cu-based electrocatalysts,identifying specific electrolyte compositions that enhance the density and stability of active sites,and providing insights into how different electrolyte environments modulate the selectivity and efficiency of C_(2+)product *** review begins by exploring how electrolytes induce favorable surface reconstruction in Cu-based catalysts,affecting surface roughness through dissolution-redeposition of Cu species and interactions with halogens and molecular *** also covers changes in crystalline facets of Cu and Cu_(2)O,and oxidation states,highlighting transitions from Cu^(0) to Cu^(δ+)and the stabilization of Cu^(+).The role of electrolytes in the C–C coupling process is examined,emphasizing their effects in modulating mass and charge transfer,CO_(2) adsorption,intermediate evolution,and product ***,the mechanisms by non-aqueous electrolytes,including organic solvents,ionic liquids,and mixed electrolytes,affecting CO_(2) reduction are analyzed,highlighting the unique advantages and challenges of each *** review concludes by addressing current challenges,proposing solutions,and research directions,such as optimizing electrolyte composition by integrating diverse cations and anions and employing advanced in-situ characterization *** insights can significantly enhance CO_(2)reduction performance on Cu-based electrocatalysts,advancing efficient and sustainable green energy technologies.

关键词： CO_(2)reduction reaction Cu-based catalyst Electrolyte Surface reconstruction Intermediates evolution

Exploring facile strategies for high-oxidation-state metal nitride synthesis: carbonate-assisted one-step synthesis of Ta_3N_5 films for solar water splitting

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Science Bulletin 2018年第21期63卷 1404-1410页

作者： Tao Fang huiting huang Jianyong Feng Yingfei Hu Yongsheng Guo Shiying Zhang Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State Microstructures Department of Physics Nanjing University College of Engineering and Applied Sciences Nanjing University Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha University

Metal nitrides are widely studied due to their outstanding physical properties, including high hardness,high thermal and chemical stability, low electrical resistivity etc. Generally, metal nitrides can be obtained from the direct reaction of metal and ammonia/nitrogen. However, some of the metal nitrides,such as Ta_3N_5, cannot be synthesized by direct nitridation of metals. To achieve Ta_3N_5, high-oxidationstate Ta precursors like Ta_2O_5, NaTaO_3, TaS_3, K_6Ta_(10.8)O_(30), Ta(N(CH_3)_2)_5 and TaCl_5 have to be employed,which is a time-consuming and laborious process with the possibility of introducing undesirable impurities. Here taking Ta_3N_5 as an example, a facile carbonate-assisted one-step nitridation method is proposed, which enables the direct synthesis of high-oxidation-state metal nitride films from metal precursors under ammonia flow. The mechanism of the nitridation process has been studied, which carbon dioxide released from carbonates decomposition reacts with metallic Ta and assists the one-step conversion of metallic Ta to Ta_3N_5. The as-prepared Ta_3N_5 film, after modified with NiFe layered double hydroxide, exhibits promising water splitting performance and stability. This method avoids the preoxidation process of metal precursors in high-oxidation-state metal nitride synthesis, and may facilitate the direct fabrication of other important metal nitrides besides Ta_3N_5.

关键词： Metal nitrides Carbonate-assisted One-step conversion Ta3N5 films Photoelectrochemical Solar water splitting

Reactive Inorganic Vapor Deposition of Perovskite Oxynitride Films for Solar Energy Conversion

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Research 2019年第1期2019卷 242-250页

作者： Tao Fang huiting huang Jianyong Feng Yingfei Hu Qinfeng Qian Shicheng Yan Zhentao Yu Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresDepartment of PhysicsNanjing University22 Hankou RoadNanjing 210093China College of Engineering and Applied Sciences Nanjing University22 Hankou RoadNanjing 210093China Jiangsu Key Laboratory for Nano Technology Nanjing University22 Hankou RoadNanjing 210093China

The synthesis of perovskite oxynitrides,which are promising photoanode candidates for solar energy conversion,is normally accomplished by high-temperature ammonolysis of oxides and carbonate precursors,thus making the deposition of their planar films onto conductive substrates ***,we proposed a facile strategy to prepare a series of perovskite oxynitride *** SrTaO_(2)N as a prototype,we prepared SrTaO_(2)N films on Ta foils under NH_(3) flow by utilizing the vaporized SrCl_(2)/SrCO_(3) eutectic *** SrTaO_(2)N films exhibit solar water-splitting photocurrents of 3.0 mA cm^(-2) at 1.23 V ***(reversible hydrogen electrode),which increases by 270%compared to the highest photocurrent(1.1 mA cm^(-2) at 1.23 V ***)of SrTaO_(2)N reported in the *** strategy may also be applied to directly prepare a series of perovskite oxynitride films on conductive substrates such as ATaO_(2)N(A=Ca,Ba)and ANbO_(2)N(A=Sr,Ba).

关键词： perovskite utilizing reversible

Organics challenge inorganics for efficient photoelectrochemical water oxidation

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Science Bulletin 2022年第3期67卷 226-228页

作者： huiting huang Jianyong Feng Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresJiangsu Key Laboratory for Nano TechnologyCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China School of Physics Nanjing UniversityNanjing 210093China

Artificial photosynthesis provides a sustainable approach toward a carbon–neutral or net-zero economy[1].Photoelectrochemical(PEC)water splitting is one of the artificial photosynthesis techniques that directly convert intermittent sunlight into clean and storable H2 fuel[2].Due to the complex 4e-/4H+process coupled with O–O bond formation step,it is widely acknowledged that the oxidation half-reaction is the efficiency-limiting factor in water splitting[3].Therefore,developing highly efficient and robust water-oxidation photoanodes is crucial for realizing practical solar fuel production.

关键词： artificial 光电化学 splitting

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基于EPR的手机逆向物流空间分析

北京大学学报（自然科学版） 2018年第5期54卷 1085-1094页

作者：黄慧婷王涛童昕北京大学城市与环境学院北京100871

以废弃手机为例,通过实地访谈,总结目前手机逆向物流的3种典型模式。以广东省为例,采用保有量系数法,估算全省2020年手机废弃量将达到1662万台,再利用Gompertz模型预测全省废弃手机的空间分布。在此基础上,采用市场区划分方法,分别计算... 详细信息

以废弃手机为例,通过实地访谈,总结目前手机逆向物流的3种典型模式。以广东省为例,采用保有量系数法,估算全省2020年手机废弃量将达到1662万台,再利用Gompertz模型预测全省废弃手机的空间分布。在此基础上,采用市场区划分方法,分别计算通过城市废物收集系统集中后再运往规范处理厂的环保化回收成本与通过消费者直接寄回的环保化回收成本,发现前者成本高于后者,考虑到以二手销售为主要目标的互联网回收模式的净收益,后者的盈利水平明显更高。目前手机的全生命周期管理需要从产业发展和环境保护的双重目标出发,有效地整合不同回收模式,在鼓励二手再利用市场发展的同时,设计合理的机制,保证产品最终废弃后的环保化处理。基于生产者责任延伸制度,品牌企业应发挥龙头作用,将多种回收模式整合进企业的逆向供应链系统,实现产品整个生命周期的有效管理。

关键词：生产者责任延伸制度逆向物流商业模式空间分析

数字化转型背景下高职数字素养与技能课程的现状及实施路径

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教育与职业 2024年第6期1054卷 38-45页

作者：黄慧婷北京师范大学职业与成人教育研究所北京100875

当前我国高职数字素养和技能以学科核心素养为主,与业务融合的专业领域数字素养和技能的培养目标、标准、方式尚不完善。国外高职阶段开设的数字素养和技能课程以职业资格框架和信息技术能力等级框架为依据,开设形式和评价方式与国内并... 详细信息

当前我国高职数字素养和技能以学科核心素养为主,与业务融合的专业领域数字素养和技能的培养目标、标准、方式尚不完善。国外高职阶段开设的数字素养和技能课程以职业资格框架和信息技术能力等级框架为依据,开设形式和评价方式与国内并无明显差异。高职数字素养与技能课程,应基于已有信息技术素养课程标准完善开设依据,以基于数字生产方式梳理的蕴含数字素养和技能的工作任务为教学载体,基于新一代信息技术开设数字素养及技能术培养的通识课程,借鉴物理工作场景营造虚实结合的混合式学习空间,将丰富的数字资源与专业课程有机整合,以及通过评估学习者数字工作任务的完成度来实施数字素养与技能的整体评价。

关键词：信息技术数字素养技能数字化转型课程

人地互动视角:三江源生态移民研究的跨学科理论框架

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青海社会科学 2023年第2期 28-39页

作者：黄慧婷田明北京师范大学社会发展与公共政策学院

三江源生态移民社区在“人”(语言文化、生产技能不匹配非农产业)和“地”(迁入区发展水平低,存在环境退化的二次风险)的制约下,移民非农转型的目标实现难度较大,依靠补助的脱贫模式不可持续,影响乡村振兴战略的顺利实施。从人地互动视... 详细信息

三江源生态移民社区在“人”(语言文化、生产技能不匹配非农产业)和“地”(迁入区发展水平低,存在环境退化的二次风险)的制约下,移民非农转型的目标实现难度较大,依靠补助的脱贫模式不可持续,影响乡村振兴战略的顺利实施。从人地互动视角,以改进后的人地关系地域系统理论为分析框架,梳理了关于三江源生态移民的历史与现在、所处地理与社会环境、能动性要素和人地关系调节的研究进展,整理移民适应困境的现状,提炼出主体元素“人”“地”“业”互动的核心概念,构建了三江源生态移民研究的跨学科理论框架。目的是从移民适应困境的根本原因(人地互动平衡的打破)和正向人地互动关系的建立两方面出发,为促进三江源113个移民社区可持续发展的后续研究提供研究视角和分析框架,为类似的少数民族移民问题提供研究思路。

关键词：三江源生态移民反贫困人地关系理论框架