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Surface engineering of 1D nanocatalysts for value-added selective electrooxidation of organic chemicals

Nano Research 2024年第3期17卷 1327-1336页

作者： Yongping Yang Chuhao liu Tinglu Song mufan li Zipeng Zhao Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Electrolytic water splitting by renewable energy is a technology with great potential for producing hydrogen(H_(2))without carbon emission,but this technical route is hindered by its huge energy(electricity)cost,which is mainly wasted by the anode oxygen evolution reaction(OER)while the value of the anode product(oxygen)is very *** the high-energy-cost OER with a selective organic compound electrooxidation carried out at a relatively lower potential can reduce the electricity cost while producing value-added ***,H_(2) generation coupled with synthesis of value-added organic compounds faces the challenge of low selectivity and slow generation rate of the anodic ***-dimensional(1D)nanocatalysts with a unique morphology,well-defined active sites,and good electron conductivity have shown excellent performance in many electrocatalytic *** rational design and regulation of 1D nanocatalysts through surface engineering can optimize the adsorption energy of intermediate molecules and improve the selectivity of organic electrooxidation ***,we summarized the recent research progress of 1D nanocatalysts applied in different organic electrooxidation reactions and introduced several different fabrication strategies for surface engineering of 1D ***,we focused on the relationship between surface engineering and the selectivity of organic electrooxidation reaction ***,future challenges and development prospects of 1D nanocatalysts in the coupled system consisting of organic electrooxidation and hydrogen evolution reactions are briefly outlined.

关键词： hydrogen generation organic compound electrooxidation one-dimensional(1D)nanocatalysts surface engineering selectivity

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Stability of dimensionally stable anode for chlorine evolution reaction

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Nano Research 2024年第3期17卷 949-959页

作者： Ziliang Deng Shuying Xu Chuhao liu Xueqiang Zhang mufan li Zipeng Zhao Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Laser Micro/Nano-Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 10081China

Chlorine(Cl2)is one of the most important chemicals produced by the electrolysis of brine solutions and is a key raw material for many areas of industrial *** nearly half a century,dimensionally stable anode(DSA)made from a mixture of RuO_(2) and TiO_(2) solid oxides coated on Ti substrate has been the most widely used electrode for chlorine evolution reaction(CER).In harsh operating environments,the stability of DSAs remains a major challenge greatly affecting their *** deactivation of DSAs significantly increases the cost of the chlor-alkali industry due to the corrosion of Ru and the formation of the passivation layer TiO_(2).Therefore,it is urgent to develop catalysts with higher activity and stability,which requires a thorough understanding of the deactivation mechanism of DSA *** paper reviews existing references on the deactivation mechanisms of DSA catalysts,including both experimental and theoretical *** on how CER selectivity affects electrode stability are also ***,studies on the effects of the preparation process,elemental composition,and surface/interface structures on the DSA stability and corresponding improvement strategies are *** development of other non-DSA-type catalysts with comparable stability is also reviewed,and future opportunities in this exciting field are also outlined.

关键词： chlorine evolution reaction(CER) dimensionally stable anode(DSA) RuO_(2)-TiO_(2) metal oxide anode stability

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In situ development of highly concave and compositionconfined PtNi octahedra with high oxygen reduction reaction activity and durability

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Nano Research 2016年第1期9卷 149-157页

作者： Enbo Zhu Yongjia li Chin-Yi Chiu Xiaoqing Huang mufan li Zipeng Zhao Yuan liu Xiangfeng Duan Yu Huang Department of Materials Science and Engineering University of California Los Angeles CA 90095 USA Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA California NanoSystems Institute University of California Los Angeles CA 90095 USA

Controlled syntheses of PtNi metal nanocrystals with unique structures for catalyzing oxygen reduction reactions （ORRs） have attracted great interest. Here, we report the one-step synthesis of single-crystal PtNi octahedra with in situ-developed highly concave features and self-confined composition that are optimal for ORR. Detailed studies revealed that the Pt-rich seeding, subsequent Pt/Ni co-reduction, and Pt-Ni interfusion resulted in uniform single-crystal PtNi octahedra, and that the combination of Ni facet segregation and oxygen etching of a Ni-rich surface led to the concavity and confined Ni content. The concave PtNi nanocrystals exhibited much higher ORR performance than the commercially available Pt/C catalyst in terms of both specific activity （29.1 times higher） and mass activity （12.9 times higher） at 0.9 V （vs. reversible hydrogen electrode （RHE））. The performance was also higher than that of PtNi octahedra without concavity, confirming that the higher activity was closely related to its morphology. Moreover, the concave octahedra also exhibited remarkable stability in ORR （93% mass activity remained after 10,000 cycles between 0.6 and 1.1 V vs. RHE） owing to the passivation of the unstable sites.

关键词： PtNi alloy concave oxygen reduction reaction

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Uptake of Heterologous or Homologous COVID-19 Booster Dose and Related Adverse Events Among Diabetic Patients:A Multicenter Cross-Sectional Study—China,2022

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China CDC weekly 2023年第1期5卷 5-10,I0004页

作者： Fan Zhang Yaxin Zhu Zhong He Xinquan Lan Moxin Song Xi Chen mufan li Jianzhou Yang Junjie Xu Department of Endocrinology Peking University Shenzhen HospitalPeking UniversityShenzhen CityGuangdong ProvinceChina Institute for International Health Professions Education and Research China Medical UniversityShenyang CityLiaoning ProvinceChina Clinical Research Academy Peking University Shenzhen HospitalPeking UniversityShenzhen CityGuangdong ProvinceChina School of Health Management China Medical UniversityShenyang CityLiaoning ProvinceChina School of Epidemiology and Public Health Shanxi Medical UniversityTaiyuan CityShanxi ProvinceChina Department of Public Health and Preventive Medicine Changzhi Medical CollegeChangzhi CityShanxi ProvinceChina

Summary What is already known about this topic?Although a third coronavirus disease 2019(COVID-19)vaccination(booster)dose is highly recommended for diabetic patients,the vaccination behaviors and related adverse events are unclear among diabetic patients with a COVID-19 booster *** is added by this report?Diabetic patients with higher postprandial blood glucose,worrying about the safety of the booster dose were less likely to get the vaccine.

关键词： Diabetic vaccination patients

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Sulfur-doped graphene anchoring of ultrafine Au25 nanoclusters for electrocatalysis

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Nano Research 2021年第10期14卷 3509-3513页

作者： mufan li Bei Zhang Tao Cheng Sunmoon Yu Sheena Louisia Chubai Chen Shouping Chen Stefano Cestellos-Blanco William AGoddard III Peidong Yang Department of Chemistry University of CaliforniaBerkeleyCalifornia 94720USA Department of Materials Science and Engineering University of CaliforniaBerkeleyCalifornia 94720USA Chemical Science Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Kavli Energy NanoScience Institute BerkeleyCalifornia 94720USA Materials and Process Simulation Center California Institute of TechnologyPasadenaCalifornia 91125USA

The biggest challenge of exploring the catalytic properties of under-coordinated nanoclusters is the issue of *** demonstrate herein that chemical dopants on sulfur-doped graphene(S-G)can be utilized to stabilize ultrafine(sub-2 nm)Au_(25)(PET)18 clusters to enable stable nitrogen reduction reaction(NRR)without significant structural *** Au_(25)@S-G exhibits an ammonia yield rate of 27.5μgNH_(3)·mgAu^(-1)·h^(-1)at-0.5 V with faradic efficiency of 2.3%.More importantly,the anchored clusters preserve~80%NRR activity after four days of continuous operation,a significant improvement over the 15%remaining ammonia production rate for clusters loaded on undoped graphene tested under the same *** labeling experiments confirmed the ammonia was a direct reaction product of N2 feeding gas instead of other chemical ***-situ X-ray photoelectron spectroscopy and X-ray absorption near-edge spectroscopy of post-reaction catalysts reveal that the sulfur dopant plays a critical role in stabilizing the chemical state and coordination environment of Au atoms in *** ReaxFF molecular dynamics(RMD)simulation confirmed the strong interaction between Au nanoclusters(NCs)and *** substrate-anchoring process could serve as an effective strategy to study ultrafine nanoclusters’electrocatalytic behavior while minimizing the destruction of the under-coordinated surface motif under harsh electrochemical reaction conditions.

关键词： gold nanoclusters sulfur-doped graphene nitrogen reduction reaction electrocatalysis anchoring effect

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Reduced graphene oxide/silicon nanowire hetero- structures with enhanced photoactivity and superior photoelectrochemical stability

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Nano Research 2015年第9期8卷 2850-2858页

作者： Xing Zhong Gongming wang Benjamin Papandrea mufan li Yuxi Xu Yu Chen Chih-Yen Chen Hailong Zhou Teng Xue Yongjia li Dehui li Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles California 90095 USA Department of Materials Science and Engineering University of California Los Angeles California 90095 USA California Nanosystems Institute University of California Los Angeles California 90095 USA

Silicon nanowires （SiNWs） have been widely studied as light harvesting antennas in photocatalysts due to their ability to absorb broad-spectrum solar radiation, but they are typically limited by poor photoelectrochemical stability. Here, we report the synthesis of reduced graphene oxide-SiNW （rGO-SiNW） heterostructures to achieve greatly improved photocatalytic activity and stability. The SiNWs were synthesized through a metal-assisted electroless etching process and functionalized with reduced graphene oxide （rGO） flakes through a chemical absorption process. Here, the rGO not only functions as a physical protection layer to isolate the SiNWs from the harsh electrochemical environment but also serves as a charge mediator to facilitate the charge separation and transport processes. Furthermore, the rGO may also function as a redox catalyst to ensure efficient utilization of photo-carriers for the desired chemical reactions. Photocatalytic dye degradation studies show that the photoactivity of the heterostructures can be significantly enhanced with an initial activation process and maintained without apparent decay over repeated reaction cycles. Electrochemical and photo- electrochemical studies indicate that the enhanced photoactivity and photostability can be attributed to the more efficient separation of photoexcited charge carriers in SiNWs and the reduced self-oxidation of the surface of the SiNWs during the photocatalytic dye degradation process. The ability to significantly improve the photocatalytic activity and stability in rGO-SiNW heterostructures can not only lead to more opportunities for the application of silicon-based photocatalysts/ photoelectrodes for solar energy harvesting but also provide new insights into the stabilization of other unstable photocatalytic

关键词： graphene,silicon nanowire,photocatalyst,photoactivity,stability

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Ultrathin wavy Rh nanowires as highly effective electrocatalysts for methanol oxidation reaction with ultrahigh ECSA

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Nano Research 2019年第1期12卷 211-215页

作者： Xiaoyang Fu Zipeng Zhao Chengzhang Wan Yiliu Wang Zheng Fan Frank Song Bocheng Cao mufan li Wang Xue Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA Department of Materials Science and Engineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA California Nanosystems Institute University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA

Direct methanol fuel cells (DMFCs) have received tremendous research interests because of the facile storage of liquid methanol ***,the DMFC today is severely plagued by the poor kinetics and rather high overpotential in methanol oxidation reaction (MOR).Here we report the investigation of the ultrathin Rh wavy nanowires as a highly effective MOR *** show that ultrathin wavy Rh nanowires can be robustly synthesized with 2-3 nm *** studies show a current peak at the potential of 0.61 V *** hydrogen electrode (RHE),considerably lower than that of Pt based catalysts (~ 0.8-0.9 V ***).Importantly,with ultrathin diameters and favorable charge transport,the Rh nanowires catalysts exhibit an ultrahigh electrochemically active surface area determined from CO-stripping (ECSAco) of 144.2 m2/g,far exceeding that of the commercial Rh black samples (20 m2/g).Together,the Rh nanowire catalysts deliver a mass activity of 722 mA/mg at 0.61 V,considerably higher than many previously reported electrocatalysts at the same *** chronoamperometry studies also demonstrate good stability and CO-tolerance compared with the Rh black control sample,making ultrathin Rh wavy nanowires an attractive electrocatalyst for MOR.

关键词： rhodium nanowires electrocatalysis methanol oxidation reaction (MOR)

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Pt-Ni alloy catalysts for highly selective anti-Markovnikov alkene hydrosilylation

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Science China Materials 2018年第10期61卷 1339-1344页

作者： Qiang li Shufang Ji mufan li Xiangfeng Duan College of Science Beijing Forestry UniversityBeijing 100083China Department of Chemistry Tsinghua UniversityBeijing 100084China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA

Alkene hydrosilylation with homogeneous catalysts is an industrially important reaction for the preparation of organosilicon compounds such as silicone-based release coatings, surfactants, adhesives and molding products [1,2]. Moreover, alkene hydrosilylation is used for cross- linking of silicone polymers, and for coupling of silanes and siloxanes to organic polymers. For decades, noble metal based catalysts （e.g., Pt [3-7], Pd [8], Rh [9], etc. [10]） have been widely used in this dass of reactions. However, the use of precious metals catalysts with a re- latively low turn-over number （TON） represents a critical barrier to industrial applications.

关键词：硅氢加成反应铂基催化剂镍合金烯烃高选择性工业化应用英文硅烷偶联剂

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五声性调式和声在中国诗词艺术歌曲伴奏中的应用

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皖西学院学报 2021年第2期37卷 117-121,130页

作者：童锐李慕凡铜陵学院文学与艺术传媒学院安徽铜陵244000 新疆农业大学体育教学部新疆乌鲁木齐830052

作为中国专业音乐的代表性音乐体裁,中国诗词艺术歌曲同时具备专业性、音乐性、文学性和历史性的特点,其伴奏的编配同样服从于这些属性。五声性调式和声的探索与应用,为该音乐体裁提供了全面且切合内涵的创作选择。以三度结构和声方法... 详细信息

作为中国专业音乐的代表性音乐体裁,中国诗词艺术歌曲同时具备专业性、音乐性、文学性和历史性的特点,其伴奏的编配同样服从于这些属性。五声性调式和声的探索与应用,为该音乐体裁提供了全面且切合内涵的创作选择。以三度结构和声方法、纵合结构和声方法和四、五度结构和声方法为主流的和弦应用,极大地深化了该音乐体裁的表演性和欣赏性。

关键词：中国诗词艺术歌曲伴奏五声性调式和声和声方法

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五声性和声在哈萨克族民歌伴奏中的应用探究

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宿州学院学报 2022年第7期37卷 58-63页

作者：童惠李暮凡安徽艺术职业学院音乐学院安徽合肥230033 新疆农业大学中国语言文学与艺术学院新疆乌鲁木齐830052

哈萨克族民歌作为中国少数民族音乐的重要载体,自新中国成立后就不断有作曲家对其进行改编并编配伴奏,将其民族性、专业性和欣赏性极大提升。哈萨克族民歌有个性的音乐形态对于五声性调式和声在伴奏中的配置虽具难度但更显多彩。从中国... 详细信息

哈萨克族民歌作为中国少数民族音乐的重要载体,自新中国成立后就不断有作曲家对其进行改编并编配伴奏,将其民族性、专业性和欣赏性极大提升。哈萨克族民歌有个性的音乐形态对于五声性调式和声在伴奏中的配置虽具难度但更显多彩。从中国民族音乐与五声性和声的关系、哈萨克族民族的音乐形态特征以及五声性和声在哈萨克族民歌伴奏中的实践应用三大角度,探寻该音乐形式的伴奏编配构思,总结其运用规律,以便在音乐创作与哈萨克族民歌演唱中更好地解析与运用。

关键词：哈萨克族民歌音乐形态伴奏五声性和声

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