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Heterogeneous Catalysis of CO2 Hydrogenation to C2＋ Products

物理化学学报 2018年第8期34卷 858-872页

作者： gao yunnan LIU Shizhen ZHAO Zhenqing TAO Hengcong SUN Zhenyu State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing 100029 R R. China.

The increasing anthropogenic emission of CO_2 leads to global warming, to address which three strategies can be considered: (1) decrease fossil fuel consumption through increased utilization efficiency and lower per capita consumption; (2) replace fossil fuels with renewable energy sources like wind, tidal, solar, and biomass energies; (3) utilize CO_2 efficiently. Despite efforts to reduce energy use and increase the use of carbon-neutral biofuels, it seems that fossil fuels will continue to be a major energy source for the next few decades. Tremendous effort is therefore being focused on developing effective technologies for CO_2 capture and transformation. In particular, the transformation of CO_2 into fuels and chemicals via reduction with renewable hydrogen is a promising strategy for mitigating global warming and energy supply problems. The hydrogenation of CO_2, especially to C_(2+) hydrocarbons and oxygenates, has sparked growing interest. The C_(2+) species can be used as entry platform chemicals for existing value chains, thus providing more advantages than C_1 compounds. However, optimizing catalyst design by integrating multifunctionalities for both CO_2 activation and C-C coupling remains an ongoing challenge. Here, we provide a timely review on the recent progress that has been made in the hydrogenation of CO_2 to higher-order alkanes, olefins, and alcohols by various heterogeneous catalysts. The thermodynamics and kinetics, as well as possible reaction pathways for CO_2 hydrogenation, are discussed. The hydrogenation of CO_2 to hydrocarbons usually involves the initial generation of CO via a reverse water-gas shift (RWGS) reaction followed by hydrogenation of the CO intermediate. The RWGS reaction proceeds through a redox route and an associative pathway. “CH_x” insertion (carbide-type) and “CO” insertion are two proposed mechanisms for this Fischer-Tropsch-like synthesis. Fe- or Co-based catalysts have been widely used to catalyze the hydrogenation o

关键词：全球变暖环境保护化学分析发展现状

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Design Principles and Mechanistic Understandings of Non-Noble-Metal Bifunctional Electrocatalysts for Zinc-Air Batteries

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Nano-Micro Letters 2024年第9期16卷 13-48页

作者： yunnan gao Ling Liu Yi Jiang Dexin Yu Xiaomei Zheng Jiayi Wang Jingwei Liu Dan Luo Yongguang Zhang Zhenjia Shi Xin Wang Ya‑Ping Deng Zhongwei Chen Power Battery and Systems Research Center State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023People’s Republic of China Department of Chemical Engineering University of WaterlooWaterlooON N2L 3G1Canada Institute of Carbon Neutrality Zhejiang Wanli UniversityNingbo 315100People’s Republic of China College of Materials and Chemistry China Jiliang UniversityHangzhou 310018People’s Republic of China

Zinc-air batteries(ZABs)are promising energy storage systems because of high theoretical energy density,safety,low cost,and abundance of ***,the slow multi-step reaction of oxygen and heavy reliance on noble-metal catalysts hinder the practical applications of ***,feasible and advanced non-noble-metal elec-trocatalysts for air cathodes need to be identified to promote the oxygen catalytic *** this review,we initially introduced the advancement of ZABs in the past two decades and provided an overview of key developments in this ***,we discussed the work-ing mechanism and the design of bifunctional electrocatalysts from the perspective of morphology design,crystal structure tuning,interface strategy,and atomic *** also included theoretical studies,machine learning,and advanced characterization technologies to provide a comprehensive understanding of the structure-performance relationship of electrocatalysts and the reaction pathways of the oxygen redox ***,we discussed the challenges and prospects related to designing advanced non-noble-metal bifunctional electrocatalysts for ZABs.

关键词： Zinc-air batteries Bifunctional electrocatalysts Design principles Mechanistic understandings

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电极和相关材料的干法制备技术

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稀有金属 2023年第12期47卷 1705-1715页

作者：李庆盈罗丹高云楠王新李新陈忠伟华南师范大学信息光电子科技学院广东广州510006 中国科学院大连化学物理研究所辽宁大连116023 肇庆市华师大光电产业研究院广东肇庆526238 肇庆理士电源技术有限公司广东肇庆526238

锂离子电池(LIBs)的出现推动了可再生能源技术和电动汽车的普及,但传统的LIBs电极制造仍受到经济和环境成本的制约。使用无溶剂的干法电极制造技术取代传统湿法涂布工艺有望提高LIBs的稳定循环寿命并实现优异的电化学性能。概述了以干... 详细信息

锂离子电池(LIBs)的出现推动了可再生能源技术和电动汽车的普及,但传统的LIBs电极制造仍受到经济和环境成本的制约。使用无溶剂的干法电极制造技术取代传统湿法涂布工艺有望提高LIBs的稳定循环寿命并实现优异的电化学性能。概述了以干法工艺LIBs制备电极、固态电解质等的研究进展,阐明了包括粘合剂纤维化、粉末喷涂沉积、干粉压片和气相沉积法等一系列干法制备技术的特点,并对比分析了这些技术相对于传统湿法制备技术的优势。值得注意的是,这些干法制备策略通过增加活性材料负载、优化离子/电子传输动力学和减轻副反应明显改善了电化学性能和循环稳定性。尽管实现完全商业化仍存在挑战,但干法电极技术在实现更环保、更具成本效益的高能量密度LIBs制造方面展现出了非凡的潜力,突显了干法制备工艺这一新兴领域进行持续研发的必要性。

关键词：锂离子电池(LIBs) 干法电池材料制备工艺粘结剂纤维化

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Efficient photocatalytic H2 evolution over tubular mesoporous carbon nitride with N-vacancy by microwave-assisted synthesis

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Science China Chemistry 2025年

作者： Yuanlong Pan Qiang Zhang Guangzheng Huang Yannan Luo Honglin gao School of Materials and Energy National Center for International Research on Photoelectric and Energy MaterialsYunnan University

Modifying the microstructure of photocatalysts while simultaneously introducing vacancies has shown significant potential in enhancing their performance for hydrogen production. Herein, a novel tubular mesoporous carbon nitride（TMCN） with nitrogen vacancies was fabricated using a microwave-assisted synthesis strategy, employing melamine-cyanuric acid supramolecular（MC-S） as the precursor. The optimized TMCN exhibited an outstanding H2production rate, approximately 29 times higher than that of pristine g-C3N4. The N-vacancies serve as sites for reactant adsorption and activation, leading to enhanced delocalization of HOMO-LUMO. Furthermore, the porous structures of TMCN facilitate the reactant diffusion, while its tubular architectures promote the oriented transfer of charge carriers. Crucially, the markedly improved photocatalytic performance of TMCN can be predominantly attributed to the synergistic effects arising from its superior structure and N-vacancy defects. This work opens new possibilities for the simultaneous formation of surface defect states as photocatalytic reaction sites and distinctive structures conducive to charge carrier transport.

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The new model of fitting the spectral energy distributions of Mrk 421 and Mrk 501

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Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 173-176页

作者： gao XiaoYan1,WANG JianCheng1 & YANG JianPing1,2 1 National Astronomical Observatories/yunnan Observatory,key Laboratory for the structure and Evolcetion of Celestical Objects,Chinese Academy of Sciences,Kunming 650011,China 2 yunnan Agricultural University,Kunming 650201,China 1. National Astronomical Observatories/yunnan Observatory key Laboratory for the structure and Evolcetion of Celestical Objects Chinese Academy of Sciences Kunming 650011 China2. Yunnan Agricultural University Kunming 650201 China

The spectral energy distribution(SED) of TeV blazars has a double-humped shape that is usually interpreted as a Synchrotron Self Compton(SSC) *** one zone SSC model is used broadly but cannot fit the high energy tail of SED very *** needs a bulk Lorentz factor which is in conflict with the ***,a one zone SSC model cannot explain the entire *** propose a new model where the high energy emission is produced by the accelerated protons in the blob with a small size and high magnetic field,and the low energy radiation comes from the electrons in the expanded *** the high and low energy photons are not produced at the same time,the requirement of a large Doppler factor from pair production is *** present the fitting results of the SEDs for Mrk 501 during April 1997 and Mrk 421 during March 2001.

关键词： GN blazar jet SPB model SSC

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A cyclic behavior of CME accelerations for accelerating and decelerating events

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Research in Astronomy and Astrophysics 2009年第10期9卷 1165-1172页

作者： Peng-Xin gao Ke-Jun Li National Astronomical Observatories / yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

We investigate the cyclic evolutionary behavior of CME accelerations for accelerating and decelerating CME events in cycle 23 from 1997 January to 2007 December. It is found that the absolute values of semiannual mean accelerations of both accelerating and decelerating CME events roughly wax and wane in a cycle, delaying the sunspot cycle in time phase. We also investigate the semiannual number of CMEs with positive and neg- ative acceleration and find that there are more decelerating CME events than accelerating CME events during the maximum period of a cycle （about three years）, but there are more accelerating CME events than decelerating CME events during the rest of the time interval of the cycle. Our results seem to suggest that the different driving mechanisms may be acting accelerate and decelerate CME events; for accelerating CME events, the propelling force （Fp） statistically seems to play a significant role in pushing CMEs outward; for decelerating CME events, the drag （Fd） statistically seems to play a more effective role in determining CME kinematic evolution in the outer corona. During the maximum period of a cycle, because of the V^2 dependence, Fd is generally stronger; because of the magnetic field dependence, Fp is also generally stronger. Thus, the absolute values of both the negative and positive accelerations are generally larger during that time. Because of the V^2 dependence, Fd may be more effective during the maximum period of a cycle. Hence, there are more decelerating CME events than accelerating CME events during that time. During the minimum time interval of a cycle, CMEs have relatively small speeds, and Fp may be more effective. Therefore, there are more accelerating CME events than decelerating CME events during that time.

关键词： Sun corona -- Sun coronal mass ejections (CMEs)

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The Attenuation Law of Horizontal Peak Acceleration on the Rock Site in yunnan Area

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Earthquake Research in China 1994年第4期8卷 112-119页

作者： Xiang Jianguang and gao DongSeismological Bureau of yunnan Province,Kunming 650041,China

In this paper,we select 131 accelerograms observed in the yunnan area and cite 114 accelerograms from western *** statistical regression analysis,we get two separate acceleration attenuation formulations based on the data of yunnan and those of both yunnan and western *** analyzing and comparing the above results with the result deprived from intensity-earthquake ground motion,this paper proposes the formula below,which may show the acceleration attenuation feature of the yunnan area:Ap=1291.07e0.5275Ms(R+15)-t.

关键词： The attenuation of peak acceleration Rock site yunnan area

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高等学校行政主体地位初探

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思想战线 2002年第5期28卷 133-136页

作者：高崇慧云南民族学院人文学院云南昆明650031

长期以来 ,高等学校的法律地位模糊不清 ,学校仅具有民事主体资格。重新界定高等学校在新体制下的行政法律地位 ,即“公务法人”地位 ,运用法人制度来处理高等学校与政府、教师、学生和社会的关系 ,是实现“以法治教”

关键词：高等学校行政主体地位 “公务法人”

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Theoretical Study on the Dehydrogenation Reaction of H2S by VS+ （3Σ-）

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Chinese Journal of Structural Chemistry 2005年第10期 1111-1116+1101页

作者： gao Shu-Lina LIU Zheng-Meib XIE Xiao-Guanga a(Department of Chemistry, yunnan University, Kunming 650091, China) b(School of Physics and Chemistry, Guizhou Normal University, Guiyang 550001, China)

The dehydrogenation reaction of H2S by the 3∑- ground state of VS+: VS+ + H2S → VS2+ + H2 has been studied by using Density Functional Theory (DFT) at the B3LYP/DZVP level. It is found that the reaction proceeds along two possible pathways (A and B) yielding two isomer dehydrogenation products VS2+-1 (3B2) and VS2+-2 (3A1), respectively. For both pathways, the reaction has a two-step-reaction mechanism that involves the migration of two hydrogen atoms from S2 to V+, respectively. The migration of the second hydrogen via TS3 and that of the first via TS4 are the rate-determining steps for pathways A and B, respectively. The activation energy is 17.4 kcal/mol for pathway A and 22.8 kcal/mol for pathway B relative to the reactants. The calculated reaction heat of 9.9 kcal/mol indicates the endothermicity of pathway A and that of –11.9 kcal/mol suggests the exothermicity of pathway B.

关键词： density functional theory cationic transition metal sulfide dehydrogenation reaction reaction mechanism

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历史民族学多学科整合研究规范的初步探索——以史载“佯黄”族属考辨为例

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思想战线 2002年第1期28卷 57-62页

作者：高发元刘锋云南大学云南昆明650091

对于跨民族史料的梳理和应用 ,前人多从史学的角度进行探索研究。由于史料的性质所限 ,往往会遇到许多难以克服的障碍 ;而运用多学科整合研究 ,立足于历史民族学的理论视野 ,用史学、语言学、民族学相结合的方法 ,则可拓宽视野、更新思... 详细信息

对于跨民族史料的梳理和应用 ,前人多从史学的角度进行探索研究。由于史料的性质所限 ,往往会遇到许多难以克服的障碍 ;而运用多学科整合研究 ,立足于历史民族学的理论视野 ,用史学、语言学、民族学相结合的方法 ,则可拓宽视野、更新思路 ,以此对历史上“佯黄”的共时态状况和历时态演化脉络进行分析 ,可以证明 :明代以前的“佯黄”是一个多民族集合称谓 ,而清代和当代所称的“佯黄”则是指毛南族的一个支系。

关键词： “佯黄” 历史民族学多学科整合研究

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