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CO2 electrolysis at industrial current densities using anion exchange membrane based electrolyzers

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Science China Chemistry 2020年第12期63卷 1711-1715页

作者： Pengfei wei Hefei Li Long Lin Dunfeng Gao Xiaomin Zhang Huimin Gong Guangyan Qing Rui Cai Guoxiong Wang xinhe Bao State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Significant progress on electrocatalytic CO2 reduction reaction (CO2RR) has been achieved in recent ***,the research and development of electrolyzer device for CO2RR is *** we use anion exchange membrane to develop zerogap electrolyzers for *** electrochemical properties of the electrolyzers with Pd/C and Cu cathodes are *** Pd/C cathode shows a current density of 200 mA cm^-2with CO Faradaic efficiency of 98%and energy efficiency of 48.8%,while the Cu cathode shows a current density of 350 mA cm^-2with total CO2RR Faradaic efficiency of 81.9%and energy efficiency of 30.5%.This work provides a promising demonstration of CO2 electrolyzer using anion exchange membrane for CO2 electrolysis at industrial current densities.

关键词： CO2 electrolysis electrolyzer industrial current density anion exchange membrane energy efficiency Pd/C catalyst Cu catalyst

Interface-controlled synthesis of CeO_2(111) and CeO_2(100) and their structural transition on Pt(111)

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Chinese Journal of Catalysis 2019年第2期40卷 204-213页

作者： Yi Zhang wei Feng Fan Yang xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908SichuanChina University of Chinese Academy of Sciences Beijing 100049China

Ceria-based catalytic materials are known for their crystal-face-dependent catalytic *** obtain a molecular-level understanding of their surface chemistry,controlled synthesis of ceria with well-defined surface structures is *** have thus studied the growth of CeOx nanostructures(NSs)and thin films on Pt(111).The strong metal-oxide interaction has often been invoked to explain catalytic processes over the Pt/CeOx ***,the Pt-CeOx interaction has not been understood at the atomic *** show here that the interfacial interaction between Pt and ceria could indeed affect the surface structures of ceria,which could subsequently determine their catalytic *** ceria on Pt(111)typically exposes the CeO2(111)surface,we found that the structures of ceria layers with a thickness of three layers or less are highly dynamic and dependent on the annealing temperatures,owing to the electronic interaction between Pt and CeOx.A two-step kinetically limited growth procedure was used to prepare the ceria film that fully covers the Pt(111)*** a ceria film of^3–4 monolayer(ML)thickness on Pt(111),annealing in ultrahigh vacuum(UHV)at 1000 K results in a surface of CeO2(100),stabilized by a c-Ce2O3(100)buffer *** oxidation at 900 K transforms the surface of the CeO2(100)thin film into a hexagonal CeO2(111)surface.

关键词： Interfacial interaction Pt/CeOx catalyst CeO2(111) CeO2(100) c-Ce2O3(100)

Interface-enhanced thermoelectric output power in CrN/SrTiO_(3-x) heterostructure

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Journal of Energy Chemistry 2022年第1期31卷 16-22,I0002页

作者： Xueying Wan Xiaowei Lu Lin Sun Mingyu Chen Na Ta wei Liu Qi Chen Liwei Chen Jian He Peng Jiang xinhe Bao State Key Laboratory of Catalysis CAS Center for Excellence in NanoscienceDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123jiangsuChina Department of Physics and Astronomy Clemson UniversityClemson 29634-0978USA

Thermoelectric devices enable direct conversion between thermal and electrical *** studies have indicated that the thin film/substrate heterostructure is effective in achieving high thermoelectric performance via decoupling the Seebeck coefficient and electrical conductivity otherwise adversely inter-dependent in homogenous bulk ***,the mechanism underlying the thin film/substrate heterostructure thermoelectricity remains *** addition,the power output of the thin film/substrate heterostructure is limited to the nanowatt scale to date,falling short of the practical application ***,we fabricated the CrN/SrTiO_(3-x) heterostructures with high thermoelectric output power and outstanding thermal *** varying the CrN film thickness and the reduction degree of CrN/SrTiO_(3-x) substrate,the optimized power output and the power density have respectively reached 276μWand 10^(8) mW/cm^(2) for the 30 nm CrN film on a highly reduced surface of CrN/SrTiO_(3-x) under a temperature difference of 300 *** performance enhancement is attributed to the CrN/CrN/SrTiO_(3-x) heterointerface,corroborated by the band bending as revealed by the scanning Kelvin probe *** results will stimulate further research efforts towards interface thermoelectrics.

关键词： SrTi0_(3-x) CrN Heterostructure Interface thermoelectrics Thin film

Visualizing nonlinear resonance in nanomechanical systems via single-electron tunneling

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Nano Research 2021年第4期14卷 1156-1161页

作者： xinhe Wang Lin Cong Dong Zhu Zi Yuan Xiaoyang Lin weisheng Zhao Zaiqiao Bai Wenjie Liang Ximing Sun Guang-wei Deng Kaili Jiang Fert Beijing Research Institute School of Microelectronics&Beijing Advanced Innovation Centre for Big Data and Brain Computing(BDBC)Beihang UniversityBeijing 100191China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics and Tsinghua-Foxconn Nanotechnology Research CenterTsinghua UniversityBeijing 100084China Key Laboratory of Quantum Information CASUniversity of Science and Technology of ChinaHefei 230026China Department of Physics Beijing Normal UniversityBeijing 100875China Institute of Physics Chinese Academy of SciencesBeijing 100080China Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Numerous reports have elucidated the importance of mechanical resonators comprising quantum-dot-embedded carbon nanotubes(CNTs)for studying the effects of single-electron ***,there is a need to investigate the single-electron transport that drives a large amplitude into a nonlinear ***,a CNT hybrid device has been investigated,which comprises a gate-defined quantum dot that is embedded into a mechanical resonator under strong actuation *** Coulomb peak positions synchronously oscillate with the mechanical vibrations,enabling a single-electron Chopper*1 ***,the vibration amplitude of the CNT versus its frequency can be directly visualized via detecting the time-averaged single-electron tunneling *** understand this phenomenon,a general formula is derived for this time-averaged single-electron tunneling current,which agrees well with the experimental *** using this visualization method,a variety of nonlinear motions of a CNT mechanical oscillator have been directly recorded,such as Duffing nonlinearity,parametric resonance,and double-,fractional-,mixed-frequency *** approach opens up burgeoning opportunities for investigating and understanding the nonlinear motion of a nanomechanical system and its interactions with electron transport in quantum regimes.

关键词： carbon nanotube mechanical resonator quantum dot nonlinear coupling

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火龙果生长支撑架改良与优化设计

热带农业工程 2024年第2期48卷 162-165页

作者：韦良宇莫华东卢新和杨佳豪唐琳玲赖沛衡广西农业职业技术大学广西南宁530007

本文介绍了一种以不锈钢为主要材料的新型火龙果生长支撑架,具有高强度、耐腐蚀、使用寿命长等优点。该支撑架能方便调整支撑支杆的臂展维度,以适应火龙果不同生长阶段的需求,并具有遮阳防虫功能。相较于传统木质、竹制支架,该不锈钢支... 详细信息

本文介绍了一种以不锈钢为主要材料的新型火龙果生长支撑架,具有高强度、耐腐蚀、使用寿命长等优点。该支撑架能方便调整支撑支杆的臂展维度,以适应火龙果不同生长阶段的需求,并具有遮阳防虫功能。相较于传统木质、竹制支架,该不锈钢支架提供了更可靠的支撑,提高了火龙果的生长质量和产量,改善了农业景观。此外,该支撑架还可适用于葡萄、百香果等藤蔓作物,具有广泛的园艺、农业、生态修复、家庭园艺和商业种植应用前景。这一创新设计为农业生产和生态环境修复提供了更灵活、耐用的植物支撑解决方案。

关键词：火龙果支撑架遮阳防虫

Photoexcited Carrier Dynamics within Alloyed CdSeTe Colloidal Quantum Dots and at the CdSeTe/TiO2 Interface

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Photoexcited Carrier Dynamics within Alloyed CdSeTe Colloida...

Interfacial Carrier Transport Property of Gallium Nitride Epilayer/Quantum Dot Hybrid Structure

第八届新型太阳能材料科学与技术学术研讨会

作者： Huiyun wei Peng Qiu xinhe Zheng School of Mathematics and Physics University of Science and Technology Beijing

Alloying strategy in quantum dots(QDs) has shown great advantages in regulating photophysical properties and improving the performance of photovoltaic devices. Typically, CdSeTe alloy QD is proved to be a superior photosensitizer, and has presented great potential in constructing high-efficient quantum dot solar cells. However, systematic analysis for the carrier dynamics is still lacking. The carrier dynamics within CdSeTe colloidal QDs and at the TiO/CdSeTe interface has been studied in detail by transient absorption(TA) spectroscopy and photoluminescence(PL) spectroscopy. TA results show that the gradient component of CdSeTe QDs leads to different electronic transition properties distinct from those of their parent binary components. Temperature-dependent time-resolved PL spectra for the CdSeTe/TiO demonstrate that PL lifetime decreases from 13.54 to 3.08 ns with increasing temperature from 10 to 300 K. Moreover, the electron transfer rate increases more quickly when temperature exceeds 250 K. In addition, it is confirmed that the crystallization characteristics of TiO have a significant impact on the interfacial carrier dynamics. A faster electron transfer from CdSeTe QDs to rutile TiO(R-TiO) has been obtained than that to anatase TiO(5.65×108/s vs 3.21×108/s). Both QDs adsorption and electron transfer properties closely dependent on the crystal orientation of R-TiO single crystal. CdSeTe QDs attached to the(100) R-TiO single crystal surface achieve the fastest electron transfer rate than other R-TiO orientations of(111),(110) and(001).

关键词： alloyed CdSeTe quantum dot carrier dynamics transient absorption

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Interfacial Carrier Transport Property of Gallium Nitride Ep...

Electrochemical synthesis of catalytic materials for energy catalysis

第九届新型太阳能材料科学与技术学术研讨会

作者： Huiyun wei Peng Qiu xinhe Zheng School of Mathematics and Physics University of Science and Technology Beijing

Although the existing ETLs such as TiO, ZnO and SnO have been widely used to fabricate high performance solar cells, they still suffer from several inherent drawbacks such as low electron mobility and poor chemical stability. Therefore, exploring other novel and effective electron transport materials is of great importance. Gallium nitride(Ga N) as emerging candidate with excellent optoelectronic properties attracts our attention, especially its significantly higher electron mobility and similar conduction band position to TiO. Here, we mainly focus on the investigation of interfacial carrier transport properties of Ga N epilayer/quantum dot hybrid structure. Benefiting from the quantum effects of QDs, suitable energy level arrangements have formed between the GaN and CdSe QDs. It is revealed that the Ga N epilayer exhibits better electron extraction ability and faster interfacial electron transfer than that of the rutile TiO single crystal. Moreover, the corresponding electron transfer rates of 4.44×10 s and 8.98×10 s have been calculated, respectively. This work preliminarily shows the potential application of Ga N in QDSCs. Carefully tailoring the structure and optoelectronic properties of Ga N, especially realizing the low-temperature deposition of high-quality Ga N on various substrates will significantly promote the construction of high-efficient GaN-ETL based QDSCs.

关键词： Quantum dot GaN electron transport layer carrier transfer

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Chinese Journal of Catalysis 2022年第4期43卷 1001-1016页

作者： Dunfeng Gao Hefei Li Pengfei wei Yi Wang Guoxiong Wang xinhe Bao State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Electrocatalysis is a process dealing with electrochemical reactions in the interconversion of chemical energy and electrical *** synthesis of catalytically active nanostructures is one of the key challenges that hinder the practical application of many important energy‐related electrocatalytic *** with conventional wet‐chemical,solid‐state and vapor deposition synthesis,electrochemical synthesis is a simple,fast,cost‐effective and precisely controllable method for the preparation of highly efficient catalytic *** this review,we summarize recent progress in the electrochemical synthesis of catalytic materials such as single atoms,spherical and shaped nanoparticles,nanosheets,nanowires,core‐shell nanostructures,layered nanomaterials,dendritic nanostructures,hierarchically porous nanostructures as well as composite *** aspects of electrochemical synthesis and several main electrochemical synthesis methods are ***‐performance correlations between electrochemically synthesized catalysts and their unique electrocatalytic properties are exemplified using selected *** offer the reader with a basic guide to the synthesis of highly efficient catalysts using electrochemical methods,and we propose some research challenges and future opportunities in this field.

关键词： Catalytic material Electrochemical synthesis Electrocatalytic reaction Electrodeposition Cathodic corrosion Nanostructure

Mild Hyperthermia-Enhanced Enzyme-Mediated Tumor Cell Chemodynamic Therapy

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Mild Hyperthermia-Enhanced Enzyme-Mediated Tumor Cell Chemod...