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Nickel-iron in the second coordination shell boost single-atomicsite iridium catalysts for high-performance urea electrooxidation

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Nano Research 2024年第5期17卷 3919-3926页

作者： Xiaoyu Chen jiawei wan Jing Chai Liang Zhang Fang Zhang Qinghua Zhang Lin Gu Lirong Zheng Ranbo Yu Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Biochemical Engineering Key Laboratory of Biopharmaceutical Preparation and DeliveryChinese Academy of SciencesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center for Combustion Energy School of Vehicle and MobilityState Key Laboratory of Intelligent Green Vehicle and MobilityTsinghua UniversityBeijing 100084China Analysis and Testing Center Beijing Institute of TechnologyBeijing 100081China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Single-atom catalysts(SACs)with high catalytic activity as well as great stability are demonstrating great promotion in electrocatalytic energy conversion,which is also a big challenge to achieve.Herein,we proposed a facile synthetic strategy to construct nickel-iron bimetallic hydroxide nanoribbon stabilized single-atom iridium catalysts(Ir-NiFe-OH),where the nickel-iron hydroxide nanoribbon not only can serve as good electronic conductor,but also can well stabilize and fully expose single-atom sites.Adopted as catalyst for urea oxidation reaction(UOR),it exhibited excellent UOR performance that it only needed a low operated potential of 1.38 V to achieve the current density of 100 mA·cm^(-2).In-situ Fourier transform infrared spectroscopy,X-ray absorption spectrum,and density functional theory calculations proved that Ir species are active centers and the existence of both Ni and Fe in the local structure of Ir atom can optimize the d-band center of Ir species,promoting the adsorption of intermediates and desorption of products for UOR.The hydrogen evolution reaction(HER)/UOR electrocatalytic cell demanded voltages of 1.46 and 1.50 V to achieve 50 and 100 mA·cm^(-2),respectively,which demonstrated a higher activity and better stability than those of conventional catalysts.This work opens a new avenue to develop catalysts for UORs with boosted activity and stability.

关键词： single-atom iridium coordinate structure nanoribbon urea electrooxidation

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Engineering single atomic ruthenium on defective nickel vanadium layered double hydroxide for highly efficient hydrogen evolution

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Nano Research 2023年第4期16卷 4612-4619页

作者： Xiaoyu Chen jiawei wan Meng Zheng Jin wang Qinghua Zhang Lin Gu Lirong Zheng Xianzhu Fu Ranbo Yu College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing InstitutionBeijing 100083China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Fabricating single-atom catalysts(SACs)with high catalytic activity as well as great stability is a big challenge.Herein,we propose a precise synthesis strategy to stabilize single atomic ruthenium through regulating vanadium defects of nickel vanadium layered double hydroxides(NiV-LDH)ultrathin nanoribbons support.Correspondingly,the isolated atomically Ru doped NiV-LDH ultrathin nanoribbons(NiVRu-R)were successfully fabricated with a super-high Ru load of 12.8 wt.%.X-ray absorption spectrum(XAS)characterization further confirmed atomic dispersion of Ru.As catalysts for electrocatalytic hydrogen evolution reaction(HER)in alkaline media,the NiVRu-R demonstrated superior catalytic properties to the commercial Pt/C.Moreover,it maintained exceptional stability even after 5,000 cyclic voltammetry cycles.In-situ XAS and density functional theory(DFT)calculations prove that the Ru atomic sites are stabilized on supports through forming the Ru-O-V structure,which also help promote the catalytic properties through reducing the energy barrier on atomic Ru catalytic sites.

关键词： hydrogen evolution reaction layered double hydroxide ruthenium atomic site ultrathin nanoribbons

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Characteristics and dynamic analysis of the February 2021 long-runout disaster chain triggered by massive rock and ice avalanche at Chamoli, Indian Himalaya

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 296-308页

作者： Tiantian Zhang Yueping Yin Bin Li Xiaojie Liu Meng wang Yang Gao jiawei wan Kaushal Raj Gnyawali Institute of Geomechanics Chinese Academy of Geological SciencesBeijing100081China China Institute of Geological Environment Monitoring China Geological SurveyBeijing100081China College of Geology Engineering and Geomatics Chang’an UniversityXi’an710100China Sichuan Geological Survey Institute Chengdu610081China Natural Hazards Section Himalayan Risk Research Institute(HRI)Bhaktapur44800Nepal

A massive rock and ice avalanche occurred on the western slope of the Ronti Gad valley in the northern part of Chamoli,Indian Himalaya,on 7 February 7,2021.The avalanche on the high mountain slope at an elevation of 5600 m above sea level triggered a long runout disaster chain,including rock mass avalanche,debris avalanche,and flood.The disaster chain had a horizontal travel distance of larger than 17,600 m and an elevation difference of 4300 m.In this study,the disaster characteristics and dynamic process were analyzed by multitemporal satellite imagery.The results show that the massive rock and ice avalanche was caused by four large expanding discontinuity planes.The disaster chain was divided into five zones by satellite images and field observation,including source zone,transition zone,dynamic entrainment zone,flow deposition zone,and flood zone.The entrainment effect and melting water were recognized as the main causes of the long-runout distance.Based on the seismic wave records and field videos,the time progress of the disaster was analyzed and the velocity of frontal debris at different stages was calculated.The total analyzed disaster duration was 1247 s,and the frontal debris velocity colliding with the second hydropower station was approximately 23 m/s.This study also carried out the numerical simulation of the disaster by rapid mass movement simulation(RAMMS).The numerical results reproduced the dynamic process of the debris avalanche,and the mechanism of long-runout avalanche was further verified by parametric study.Furthermore,this study discussed the potential causes of disaster and flood and the roles of satellite images and seismic networks in the monitoring and early-warning.

关键词： Rock and ice avalanche Disaster chain Long-runout Entrainment Flood

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Multishelled CuO/Cu_(2)O induced fast photo-vapour generation for drinking water

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Nano Research 2022年第5期15卷 4117-4123页

作者： Xuanbo Chen Ping Li Jiao wang jiawei wan Nailiang Yang Bo Xu Lianming Tong Lin Gu Jiang Du Jianjian Lin(✉) Ranbo Yu Dan wang Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Biochemical Engineering Key Laboratory of Science and Technology on Particle MaterialsChinese Academy of SciencesBeijing 100190China Key Laboratory of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Henan Province Industrial Technology Research Institute of Resources and Materials Green Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou 450001China University of Chinese Academy of Sciences Beijing 100049China Center for Nano-chemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Solar thermal interfacial water evaporation is proposed as a promising route to address freshwater scarcity,which can reduce energy consumption and have unlimited application scenarios.The large semiconductor family with controllable bandgap and good chemo-physical stability are considered as good candidates for photo-evaporation.However,the evaporation rate is not satisfactory because the rational control of nano/micro structure and composition is still in its infancy stage.Herein,by systemically analyzing the photo-thermal evaporation processes,we applied the hollow multishelled structure(HoMS)into this application.Benefiting from the multishelled and hierarchical porous structure,the light absorption,thermal regulation,and water transport are simultaneously optimized,resulting in a water evaporation rate of 3.2 kg·m^(-2)·h^(-1),which is among the best performance in solar-vapour generation.The collected water from different water resources meets the World Health Organization standard for drinkable water.Interestingly,by using the CuO/Cu_(2)O system,reactive oxygen species were generated for water disinfection,showing a new route for efficient solar-vapour generation and a green way to obtain safe drinking water.

关键词： multishelled structure hollow structure water evaporation nano/micro structure

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Identification of strained black phosphorous by Raman spectroscopy

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Journal of Semiconductors 2017年第4期38卷 10-13页

作者： jiawei wan Junhong Guo Fangren Hu School of Optoelectronic Engineering and Gruenberg Research Centre Nanjing University of Posts and TelecommunicationsNanjing 210023China

Phosphorene has a very high hole mobility and can be a tuned band structure,and has become an ideal material for electronic devices.For this new type of two-dimensional material,in the applied strain,black phosphorus（BP） can be changed into an indirect band gap and metallic materials from the direct band gap semiconductor material,which greatly affect its inherent physical characteristics.How to identify strained micro structure changes becomes an important problem.The calculated Raman spectra disclose that the Ag-2 mode and B（2g） mode will split and the Raman spectra appear,while the Ag-1 mode is shifted to low-frequency region.The deformation induced by strain will effectively change the Raman mode position and intensity,this can be used to identify phosphorus changes.

关键词： black phosphorus strain Raman scattering DFT

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考虑拆解故障的退役产品人机混流线插单调度

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湖南大学学报（自然科学版） 2024年第4期51卷 153-160页

作者：任莹晖万家伟匡增彧谢晖湖南大学机械与运载工程学院湖南长沙410082

多源异构退役3C产品服役阶段产生的结构变形可能引发自动拆解设备故障,性能漂移失效会扰动拆解工艺规划和生产调度.以退役3C产品人机混流拆解线为研究对象,研究退役产品拆解故障导致的插单调度问题.构建量化不确定性拆解序列和拆解深度... 详细信息

多源异构退役3C产品服役阶段产生的结构变形可能引发自动拆解设备故障,性能漂移失效会扰动拆解工艺规划和生产调度.以退役3C产品人机混流拆解线为研究对象,研究退役产品拆解故障导致的插单调度问题.构建量化不确定性拆解序列和拆解深度的AND/OR节点网络模型.以最大化工位利用率为优化目标,拆解故障产品缓存搬运阈值为变量,建立人机混流线插单调度模型.采用二维实数编码方式编码,选用遗传算法求解.选取58种品系退役智能手机的人机混流聚类拆解产线数据实例验证.结果表明,构建的人机混流线插单调度模型能有效制定工位利用率最大的阈值插单调度方案.实例聚类的3类混流拆解线优化后的最大工位利用率分别为80.3%、73.2%、81.3%.

关键词：回收利用退役产品拆解故障插单调度 AND/OR节点模型

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基于双进度变量的非预混火焰NO生成大涡模拟研究

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工程热物理学报 2024年第1期45卷 295-302页

作者：万佳伟魏正昀蒋旭东郭军军柳朝晖华中科技大学能源与动力工程学院煤燃烧国家重点实验室武汉430074 Clean Combustion Research Center King Abdullah University of Science and TechnologyThuwal 23955Saudi Arabia

本文基于火焰面/进度变量(FPV)模型框架,提出了一种双进度变量NO输运修正模型。将该模型与大涡模拟相结合,对Sandia非预混甲烷射流火焰开展了数值模拟。结果表明,该模型对于NO浓度的预测精度相比于文献中结果显著提升。进一步详细分析... 详细信息

本文基于火焰面/进度变量(FPV)模型框架,提出了一种双进度变量NO输运修正模型。将该模型与大涡模拟相结合,对Sandia非预混甲烷射流火焰开展了数值模拟。结果表明,该模型对于NO浓度的预测精度相比于文献中结果显著提升。进一步详细分析了具有火焰不稳定性的Sandia火焰F的NO生成特性,当雷诺数从22400升高至44800时,火焰F相比于火焰D,中心轴线处的NO峰值下降约28%。模拟结果成功捕捉到了雷诺数升高导致的强局部熄火现象,以及该条件下火焰温度降低,NO生成受到抑制的趋势。

关键词：火焰不稳定性大涡模拟火焰面/进度变量模型 NO生成

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Efficient sequential harvesting of solar light by heterogeneous hollow shells with hierarchical pores

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National Science Review 2020年第11期7卷 1638-1646页

作者： Yanze Wei jiawei wan Nailiang Yang Yu Yang Yanwen Ma Songcan wang Jiangyan wang Ranbo Yu Lin Gu Lianhui wang Lianzhou wang Wei Huang Dan wang State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing University of Chinese Academy of Sciences Chinese Academy of Sciences School of Materials Science and Engineering Nanjing University of Posts and Telecommunications School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of Queensland Department of Materials Science andEngineering Stanford University Institute of Physics Chinese Academy of Sciences

In nature, sequential harvesting of light widely exists in the old life entity, i.e. cyanobacteria, to maximize the light absorption and enhance the photosynthesis efficiency. Inspired by nature, we propose a brand new concept of temporally-spatially sequential harvesting of light in one single particle, which has purpose-designed heterogeneous hollow multi-shelled structures (HoMSs) with porous shells composed of nanoparticle subunits. Structurally, Ho MSs consist of different band-gap materials outside-in, thus realizing the efficient harvesting of light with different wavelengths. Moreover, introducing oxygen vacancies into each nanoparticle subunit can also enhance the light absorption. With the benefit of sequential harvesting of light in Ho MSs, the quantum efficiency at wavelength of 400 nm is enhanced by six times compared with the corresponding nanoparticles. Impressively, using these aforementioned materials as photocatalysts,highly efficient photocatalytic water splitting is realized, which cannot be achieved by using the nanoparticle counterparts. This new concept of temporally-spatially sequential harvesting of solar light paves the way for solving the ever-growing energy demand.

关键词： light harvesting hollow structures multi-shelled solar energy conversion

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雅鲁藏布江大峡谷则隆弄高位冰岩崩灾害链动力学特征

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工程地质学报 2024年第3期32卷 996-1009页

作者：高少华殷跃平李滨高杨万佳威张田田高浩源中国地质科学院地质力学研究所机构北京100081 中国地质环境监测院北京100081 自然资源部活动构造与地质安全重点实验室北京100081

雅鲁藏布江下游冰川分布广泛,曾发生多次高位冰岩崩事件,引发灾害链,如泥石流或碎屑流,危害巨大。本文通过野外现场调查,结合多时相卫星图像及无人机数据,以则隆弄沟为例,分析了高位灾害的地貌特征及运动动力学效应。研究表明:(1)则隆... 详细信息

雅鲁藏布江下游冰川分布广泛,曾发生多次高位冰岩崩事件,引发灾害链,如泥石流或碎屑流,危害巨大。本文通过野外现场调查,结合多时相卫星图像及无人机数据,以则隆弄沟为例,分析了高位灾害的地貌特征及运动动力学效应。研究表明:(1)则隆弄沟高位灾害垂向落差大,不同海拔区段微地貌形态各有差异,具有典型的垂直分带性,根据地貌展布特征及形态可划分为高陡冰蚀地形、弯曲型沟谷地形、堆积河谷地形,独特的地貌条件和地质环境使高位灾害与中低海拔地区有显著区别。(2)高位冰岩崩灾害链经历冰岩崩、碎屑流运动、堆积堵江、洪水溃决4个阶段,形成高位远程地质灾害链,运动过程中表现出复杂的动力学效应,包括冲击解体效应、散体成拱效应、动力侵蚀效应、碎屑堆积效应,为研究碎颗粒流动行为及动力学过程提供信息。(3)则隆弄冰舌处冰碛物富集,冰舌前缘及后缘分布有大量裂缝,随时间推移内部裂纹扩展累积,应力拱承载力下降而破坏致灾。未来在气候变化及强烈的构造活动影响下,雅鲁藏布江下游高位冰岩崩灾害风险极高,引发次生堵江-洪水灾害危害极大,应加强这类流域性灾害的预警及风险防范。

关键词：高位冰岩崩灾害链地貌垂直分带性动力学效应雅鲁藏布江

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Eliminating Hysteresis of Perovskite Solar Cells with Hollow CO_(2) Mesoporous Electron Transport Layer

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Chemical Research in Chinese Universities 2022年第1期38卷 117-122页

作者： HAN Wensheng wanG Yongling wan jiawei wanG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Graduate School of Science and Technology Gunma University 1-5-1 Tenjin-choKiryuGunma 376-8515Japan

Current density-voltage(J-V) hysteresis issue caused by unbalanced charge transport has greatly limited the improvement of power conversion efficiency(PCE) of halide perovskite solar cells(PSCs). Herein, hollow TiO2 mesoporous electron transport layer(ETL) was used to fabricate PSCs. The structure-dependent charge collection as well as its effect on PCE and hysteresis impactor(HI) of PSC were investigated. The results demonstrate that TiO2 hollow spheres in a size of around 50 nm (HS-50) can form a high quality perovskite/ETL interface with a less trap density. Moreover, the hollow TiO2 with the thin shell can help promote the extraction of electrons from perovskite layer to ETL, so as to reduce the charge accumulation and recombination at the perovskite/ETL interface and alleviate the hysteresis behavior. As a result, PSCs with HS-50 TiO2 delivered a champion PCE of 16.81% with a small HI of 0.0297, indicating a better performance than the commercial P25(PCE of 15.87%, HI of 0.2571).

关键词： Hollow structure Titanium dioxide Hysteresis Halide perovskite solar cell Charge collection

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