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Regulating single-atom Mn sites by precisely axial pyridinic-nitrogen coordination to stabilize the oxygen reduction

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Journal of Energy Chemistry 2023年第5期80卷 542-552,I0012页

作者： Yuan Qin chaozhong guo Zihao Ou Chuanlan Xu Qi Lan Rong Jin Yao Liu Yingchun Niu Quan Xu Yujun Si Honglin Li Chongqing Key Laboratory of Materials Surface&Interface Science Chongqing University of Arts and SciencesChongqing 402160China School of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing 400054China College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Biogas Upgrading UtilizationChina University of Petroleum-BeijingBeijing 102249China College of Chemistry and Environmental Engineering Sichuan University of Science and EngineeringZigong 643000SichuanChina School of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China

Designing single-atom catalysts for oxygen reduction reaction(ORR)are fashionable but challenging to boost the zinc-air battery *** enhanced ORR activity by manganese(Mn)singleatom catalysts can be achieved by accurately regulating the coordination number of isolated Mn *** calculations indicate that the single Mn-N5sites possess lower free energy barrier and higher oxygen adsorption performance than single Mn-N4sites to accelerate the ORR *** to it,here we synthesize an atomically dispersed Mn-N5catalyst by precisely axial coordination of pyridinic-N doped into two-dimensional(2D)porous nanocarbon sheets(~3.56 nm thickness),which reveals outstanding catalytic activity and ultrahigh stability for the ORR in zinc-air battery owing to the inhomogeneous charge distribution of Mn-N5sites compared to the conventional single-site Mn-N4catalyst and Pt/*** work gives a new strategy for in situ regulating the electronic structure of metal single-atoms and further promoting the overall ORR performance in energy systems.

关键词： Single-atom manganese catalyst Mn-N5 active moiety Oxygen reduction reaction,Coordination number Axial pyridinic-nitrogen coordination

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Research progress of voltage delay in magnesium battery

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Chinese Science Bulletin 2014年第17期59卷 1936-1941页

作者： Lin Chen Changguo Chen chaozhong guo College of Chemistry and Chemical Engineering Chongqing University College of Material and Chemical Engineering Sichuan University of Science and Engineering

Research on magnesium battery has three primary fields as follows:changing the metallurgical factors of the magnesium electrode material to improve discharge performance,identifying inhibitors to form a protective film to reduce self-corrosion of magnesium alloys,and improving the electrochemical properties of the electrolyte to improve discharge *** the research and development of the magnesium battery,the voltage delay that occurs in the discharge process is a critical issue because it limits the application of Mg/*** paper provides an overview of the relationship between the voltage delay of magnesium primary battery and magnesium anode ***,the factors affecting the voltage delay were analyzed,and the existing problems in the study of the voltage delay of magnesium battery were identified.

关键词：电池电压镁电池延迟电化学性能放电性能冶金因素电极材料放电过程

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The structural changes of blood pyropolymers and their beneficial electrocatalytic activity toward oxygen reduction

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Chinese Science Bulletin 2013年第23期58卷 3698-3703页

作者： guo chaozhong CHEN Changguo LUO ZhongLi College of Chemistry and Chemical Engineering Chongqing University College of Basic Medical Sciences Molecular Medicine and Cancer Research CenterChongqing Medical University

There is a growing interest in designing more effective fuel cell cathode catalyst *** the partial pyrolysis of animal bloods has been used to produce the blood pyropolymers,which are an intermediate substance between a polymer and carbonaceous *** pyropolymers were yielded by carbonization process below 600°*** structural changes in the pyropolymers were characterized by X-ray diffraction,and their formation was checked by micro-IR spectra,thermogravimetric and differential thermal *** potential electrocatalytic properties were evaluated using the linear sweep voltammetry in the O2-saturated KOH *** is found that the process of pyropolymer formation began about 200°C and completed around500°*** change of particle phase depends on the formation of the pyropolymers,but has no effect to their internal carbon structures which are controlled by pyrolysis process ***,it is confirmed that the crystalline phases in the pyropolymers can exist at the surface of heat-treated *** can be also found that the carbon materials are active toward oxygen reduction and their activity is associated with the carbonization *** study will stimulate the designers to design the highly active catalysts by using native blood pyropolymers as the precursors.

关键词：电催化活性动物血液结构变化氧还原线性扫描伏安法催化剂前体 X-射线衍射高活性催化剂

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Preliminary report of coseismic surface rupture(part)of Türkiye's M_(W)7.8 earthquake by remote sensing interpretation

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Earthquake Research Advances 2024年第1期4卷 4-13页

作者： Yali guo Haofeng Li Peng Liang Renwei Xiong chaozhong Hu Yueren Xu Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingChina Earthquake AdministrationBeijing100036China

Both M_(W) 7.8 and M_(W) 7.5 earthquakes occurred in southeastern Türkiye on February 6,2023,resulting in numerous buildings collapsing and serious *** the distribution of coseismic surface ruptures and secondary disasters surrounding the epicentral area is important for post-earthquake emergency and disaster ***-resolution Maxar and GF-2 satellite data were used after the events to extract the location of the rupture surrounding the first epicentral *** results show that the length of the interpreted surface rupture zone(part of)is approximately 75 km,with a coseismic sinistral dislocation of 2-3 m near the epicenter;however,this reduced to zero at the tip of the southwest section of the East Anatolia Fault ***,dense soil liquefaction pits were triggered along the rupture *** events are in the western region of the Eurasian Seismic Belt and result from the subduction and collision of the Arabian and African Plates toward the Eurasian *** western region of the Chinese mainland and its adjacent areas are in the eastern section of the Eurasian Seismic Belt,where seismic activity is controlled by the collision of the Indian and Eurasian *** China and Türkiye have independent tectonic histories.

关键词： 2023 Türkiye M_(w)7.8 earthquake Coseismic surface rupture East anatolian fault zone Eurasian seismic zone Remote sensing interpretation

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Barium charge transferred doped carbon dots with ultra-high quantum yield photoluminescence of 99.6% and applications

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Chinese Chemical Letters 2021年第2期32卷 861-865页

作者： Yao Liu Jianfei Wei Xiang Yan Ming Zhao chaozhong guo Quan Xu Chongqing Key Laboratory of Materials Surface&Interface Science College of Materials Science and EngineeringChongqing University of Arts and SciencesChongqing 402160China School of Materials Designing and Engineering Beijing Institute of Fashion TechnologyBeijing 100029China School of Materials Science and Engineering Boise UniversityBaise 533000China State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Biogas Upgrading UtilizationChina University of Petroleum-BeijingBeijing 102249China

Long-emission carbon dots(CDs) is triggering immense enthusiasm on account of their intrinsic merits of high chemical stability and excellent optical *** this study,a facile and rapid approach was developed for the preparation of barium-doped carbon dots(Ba-CDs) with yellow fluo rescence emission and high quantum *** chemistry and the chemical architecture of the Ba-CDs was revealed under various spectroscopic *** work provides more insights into the effects of charge transfer caused by Ba heteroatoms,which is considered as the most challenging step in the investigation on luminescence ***,the prepared Ba-CDs were successfully applied as fluorescent probes in the detection of trace water in organic solvents(ethanol,isopropanol,acetone,tetrahydrofuran).Comparing with traditional fluorescent probes for water detection in organic solvents,Ba-CDs detection provides a more sensitive,much faster and more economical approach.

关键词： Ba-doped Carbon dots Quantum yield Charge transfer Fluorescent sensors

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Coprinus comatus-derived nitrogen-containing biocarbon electrocatalyst with the addition of self-generating graphene-like support for superior oxygen reduction reaction

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Science Bulletin 2016年第12期61卷 948-958页

作者： chaozhong guo Wenli Liao Zhongbin Li Lingtao Sun Haibo Ruan Qingshan Wu Qinghong Luo Jie Huang Changguo Chen Research Institute for New Materials Technology Chongqing University of Arts and Sciences School of Chemistry and Chemical Engineering Chongqing University School of Materials and Chemical Engineering Chongqing University of Arts and Sciences

The development of nitrogen-rich biomassderived carbon catalysts provides an attractive perspective to substitute for Pt-based electrocatalysts for oxygen reduction reaction(ORR). We here report a facile strategy for synthesis of a nitrogen-doped biocarbon/graphene-like composite electrocatalyst by pyrolyzing a solid-state mixture of coprinus comatus biomass and melamine under nitrogen protection. The graphtic carbon nitride formed by polycondensation of melamine at 600 °C acts as a selfsacrificing template to generate the nitrogen-doped graphene-like sheet, which can function as an inserting agent and self-generating support. The composite catalyst exhibits the most promising catalytic activity towards the fourelectron ORR with a half-wave potential of around 0.83 V(vs. RHE), and more excellent stability and tolerance to methanol/ethanol compared to the commercial Pt/C catalyst. It is interestingly found that both a higher content of nitrogen and a larger ratio of graphitic-nitrogen species,which may derive from self-addition of graphene-like support into the catalyst, can effectively improve the electrocatalytic activity. The planar N group may be the nitrogen functionality that is most responsible for maintaining the ORR activity in alkaline medium. This study can largely encourage the exploration of high-performance carbon-based catalysts from economical and sustainable fungus biomass.

关键词：电催化剂氧还原反应生物质炭类石墨鸡腿菇含氮电催化活性 Pt/C催化剂

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国产6061-T6铝合金的修正塑性本构模型

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同济大学学报（自然科学版） 2024年第7期52卷 1079-1088页

作者：郭小农宗绍晗张超众成张佳宁同济大学土木工程学院上海200092 上海宝冶集团有限公司上海200941

铝合金材料已广泛地应用于各种工程结构中。能准确描述铝合金在复杂应力状态下的塑性本构关系,对铝合金结构在复杂工况下的分析和设计具有重要意义。传统的von Mises屈服准则忽略了应力状态对金属塑性的影响,并不适用于复杂应力状态下... 详细信息

铝合金材料已广泛地应用于各种工程结构中。能准确描述铝合金在复杂应力状态下的塑性本构关系,对铝合金结构在复杂工况下的分析和设计具有重要意义。传统的von Mises屈服准则忽略了应力状态对金属塑性的影响,并不适用于复杂应力状态下的铝合金材料。通过试验证明了应力三轴度和Lode角均会对6061-T6铝合金的塑性行为产生影响,并在此基础上提出了适用于国产6061-T6铝合金在复杂应力状态下的塑性本构模型,并校准了全过程硬化规律和新屈服准则。通过试验和数值结果对比可知,该塑性本构模型可以精确地模拟国产6061-T6铝合金在复杂应力状态下的弹塑性行为。

关键词：铝合金塑性本构模型应力三轴度 Lode角

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Numerical analysis of aluminum alloy reticulated shells with gusset joints under fire conditions

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Frontiers of Structural and Civil Engineering 2023年第3期17卷 448-466页

作者： Shaojun ZHU Zhangjianing CHENG chaozhong ZHANG Xiaonong guo College of Civil Engineering Tongji UniversityShanghai 200092China

In this study,a numerical analysis was conducted on aluminum alloy reticulated shells(AARSs)with gusset joints under fire ***,a thermal-structural coupled analysis model of AARSs considering joint semirigidity was proposed and validated against room-temperature and fire *** proposed model can also be adopted to analyze the fire response of other reticulated structures with semi-rigid ***,a parametric analysis was conducted based on the numerical model to explore the buckling behavior of K6 AARS with gusset joints under fire *** results indicated that the span,height-to-span ratio,height of the supporting structure,and fire power influence the reduction factor of the buckling capacity of AARSs under fire *** contrast,the reduction factor is independent of the number of element divisions,number of rings,span-to-thickness ratio,and support ***,practical design formulae for predicting the reduction factor of the buckling capacity of K6 AARSs were derived based on numerical analysis results and machine learning techniques to provide a rapid evaluation ***,further numerical analyses were conducted to propose practical design suggestions,including the conditions of ignoring the ultimate bearing capacity analysis of K6 AARS and ignoring the radiative heat flux.

关键词： aluminum alloy reticulated shell gusset joint numerical analysis fire resistance

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PPy@PU纳米纤维膜的制备及其电磁屏蔽和应变传感性能

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上海纺织科技 2022年第3期50卷 10-14,29页

作者：周玉嫚郭朝忠廖焕如齐琨欧康康喻红芹中原工学院河南省新型纺织材料与纺织品国际联合实验室河南郑州450007 中原工学院河南省功能性纺织材料重点实验室河南郑州450007

利用静电纺丝技术制备了聚氨酯(PU)纳米纤维膜材料,通过原位液相聚合在PU纳米纤维表面形成连续的聚吡咯(PPy)导电网络,构建了柔性PPy@PU纳米纤维导电膜材料,系统研究了聚合PPy前后PU纳米纤维形貌的变化、吡咯(Py)单体在纤维表面的最佳... 详细信息

利用静电纺丝技术制备了聚氨酯(PU)纳米纤维膜材料,通过原位液相聚合在PU纳米纤维表面形成连续的聚吡咯(PPy)导电网络,构建了柔性PPy@PU纳米纤维导电膜材料,系统研究了聚合PPy前后PU纳米纤维形貌的变化、吡咯(Py)单体在纤维表面的最佳聚合条件以及PPy@PU纳米纤维膜的电磁屏蔽和应变传感性能。结果表明:PPy能够较好地聚合在PU纳米纤维表面,且当聚合时间为6 h、Py单体浓度为0.15 mol/L、膜厚为0.124 mm时,PPy@PU纳米纤维膜具有较好的柔性,电导率为722 S/m,在X波段(8.2~12.4 GHz)的电磁屏蔽效能为25.02 d B;同时在该条件下,PPy@PU纳米纤维膜具有优异的应变传感性能,在伸长率为50%时,电阻变化率为94.6%,最大拉伸应变系数可达326.3。说明构建的PPy@PU纳米纤维膜材料可以应用于具有电磁屏蔽和应变传感功能的可穿戴电子设备领域。

关键词：纳米纤维聚氨酯聚吡咯电磁屏蔽应变传感

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N,Cr共掺锐钛矿TiO_2电子结构和光学性质的第一性原理研究

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功能材料 2015年第23期46卷 23075-23079页

作者：孙凌涛郭朝中伏春平石东平重庆文理学院新材料技术研究院重庆402160

采用第一性原理的平面波赝势方法研究了N、Cr单一掺杂及共掺杂锐钛矿TiO_2的能带结构、态密度和光学性质。结果表明,N单一掺杂体系中N2p杂质轨道交叠在费米能级上;Cr单一掺杂体系中杂质能级主要由O2p和Cr3d轨道杂化贡献;N、Cr共掺杂致... 详细信息

采用第一性原理的平面波赝势方法研究了N、Cr单一掺杂及共掺杂锐钛矿TiO_2的能带结构、态密度和光学性质。结果表明,N单一掺杂体系中N2p杂质轨道交叠在费米能级上;Cr单一掺杂体系中杂质能级主要由O2p和Cr3d轨道杂化贡献;N、Cr共掺杂致使导带及价带相对费米能级明显下降,同时在原禁带基础上形成了新的杂质能级、禁带宽度减小,锐钛矿TiO_2的光吸收带红移,其吸收系数增大、能量损失缩小,有效增强了锐钛矿TiO_2的光催化效率。

关键词：锐钛矿TiO2 N+Cr共掺杂电子结构光学性质

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