Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201912044
Ding Shaosong, Y. Tong, Wang Xingpu, Gao Jian’an, Z. Ying
: The electroreduction of CO 2 into value-added chemicals and fuels has garnered a broad interest by using renewable clean energy, due to both alleviating global warming and completing the carbon cycle. Herein, a high-performance Ni-N doped porous carbon catalyst was prepared through pyrolysis of hydrogen containing peptone, NiCl 2 , and NaCl made by a freeze dry method. The Ni-N-doped porous carbon catalyst displayed an excellent performance of CO 2 electroreduction with a Faraday efficiency of 92.0% at − 0.66 V ( vs . RHE), 550 mV overpotential ， and 2.5 mA · cm − 2 current density. The catalytic performances were attributed to the Ni-N active sites and porous structures. In addition, CO 2 electroreduction to CO was performed continuously by using solar energy, which may provide a valuable reference for carbon cycle in future.
通过使用可再生清洁能源，将二氧化碳电还原成增值化学品和燃料已引起广泛的兴趣，因为它既可以缓解全球变暖，又可以完成碳循环。本文以冻干法制备的蛋白胨、NiCl 2和NaCl为原料，通过热解制备了高性能的Ni-N掺杂多孔碳催化剂。在−0.66 V (vs)下，ni - n掺杂多孔碳催化剂具有良好的CO 2电还原性能，法拉第效率为92.0%。RHE)， 550 mV过电位和2.5 mA·cm−2电流密度。催化剂的催化性能主要取决于Ni-N活性位点和多孔结构。此外，利用太阳能连续电还原co2为CO，可为未来碳循环提供有价值的参考。
{"title":"Ni-N Doped Porous Carbon for Electrocatalytic Reduction of CO2 into CO Driven by Solar Energy","authors":"Ding Shaosong, Y. Tong, Wang Xingpu, Gao Jian’an, Z. Ying","doi":"10.3866/pku.dxhx201912044","DOIUrl":"https://doi.org/10.3866/pku.dxhx201912044","url":null,"abstract":": The electroreduction of CO 2 into value-added chemicals and fuels has garnered a broad interest by using renewable clean energy, due to both alleviating global warming and completing the carbon cycle. Herein, a high-performance Ni-N doped porous carbon catalyst was prepared through pyrolysis of hydrogen containing peptone, NiCl 2 , and NaCl made by a freeze dry method. The Ni-N-doped porous carbon catalyst displayed an excellent performance of CO 2 electroreduction with a Faraday efficiency of 92.0% at − 0.66 V ( vs . RHE), 550 mV overpotential ， and 2.5 mA · cm − 2 current density. The catalytic performances were attributed to the Ni-N active sites and porous structures. In addition, CO 2 electroreduction to CO was performed continuously by using solar energy, which may provide a valuable reference for carbon cycle in future.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70220707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202002043
Xianyong Lu
{"title":"Catalysts for Establishing an Interesting Class of Element Chemistry","authors":"Xianyong Lu","doi":"10.3866/pku.dxhx202002043","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002043","url":null,"abstract":"","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202002035
Yanping Zeng, Ming Li, Hong Lin, Qilin Huang
{"title":"Application of Blended Teaching in Classroom Teaching of Organic Chemistry Experiment","authors":"Yanping Zeng, Ming Li, Hong Lin, Qilin Huang","doi":"10.3866/pku.dxhx202002035","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002035","url":null,"abstract":"","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202002037
Z. Tao, Shuyong Zhang
: The discrepancies for calculating condensation temperature and boiling temperature for droplet and small bubble using Kelvin equation were discussed. The discrepancies can be ascribed to the neglect of variation of the vapor pressure of curved surface to plain surface with temperature, and the misusing of Kelvin equation for small bubble during boiling. The way to reduce the discrepancy is introduced while the applicability of Kelvin equation is discussed.
{"title":"Analysis of the Temperature Deviation for Boiling of Liquid and Condensation of Vapor Using Kelvin Equation","authors":"Z. Tao, Shuyong Zhang","doi":"10.3866/pku.dxhx202002037","DOIUrl":"https://doi.org/10.3866/pku.dxhx202002037","url":null,"abstract":": The discrepancies for calculating condensation temperature and boiling temperature for droplet and small bubble using Kelvin equation were discussed. The discrepancies can be ascribed to the neglect of variation of the vapor pressure of curved surface to plain surface with temperature, and the misusing of Kelvin equation for small bubble during boiling. The way to reduce the discrepancy is introduced while the applicability of Kelvin equation is discussed.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70221520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202003012
LIShan YUANYuan, He Juan, Li Kai
: At the beginning of the New Year in 2020, Corona Virus Disease 2019 (COVID-19) suddenly swept across the country. In order to prevent the infection caused by crowd, “Suspended classes but not stop teaching and learning” was proposed by the Ministry of Education. Students in local colleges and universities show obvious variations in self-discipline, consciousness and initiative. Such a practical situation brings us a great challenge to effectively carry out the online teaching for chemistry major. Taking the online teaching of “Materials Chemistry” as an example, this paper introduces the process of online teaching of chemistry major in the local universities. In view of the problems encountered in the teaching process and the solutions adopted, this paper summarizes the issues needing attention during the online teaching. It is hoped that this paper can provide some useful reference for the online teaching of chemistry major in local colleges and universities.
{"title":"A Preliminary Study on the Online Teaching of Materials Chemistry","authors":"LIShan YUANYuan, He Juan, Li Kai","doi":"10.3866/pku.dxhx202003012","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003012","url":null,"abstract":": At the beginning of the New Year in 2020, Corona Virus Disease 2019 (COVID-19) suddenly swept across the country. In order to prevent the infection caused by crowd, “Suspended classes but not stop teaching and learning” was proposed by the Ministry of Education. Students in local colleges and universities show obvious variations in self-discipline, consciousness and initiative. Such a practical situation brings us a great challenge to effectively carry out the online teaching for chemistry major. Taking the online teaching of “Materials Chemistry” as an example, this paper introduces the process of online teaching of chemistry major in the local universities. In view of the problems encountered in the teaching process and the solutions adopted, this paper summarizes the issues needing attention during the online teaching. It is hoped that this paper can provide some useful reference for the online teaching of chemistry major in local colleges and universities.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202004025
Minhui Cao, Wei Shi, Honghu Jiang, Shen Xu
Under the case of novel coronavirus (COVID 19), and in response to the Ministry of Education’s call for “postponement of school without suspension of learning”, online teaching should be equivalent to the real class teaching. Based on Chinese University MOOC platform, this paper establishes SPOC on campus with the open online course Organic Chemistry as the online learning resource. Before class, students learn online video and self-testing. The teacher will answer questions and interact with students through live broadcasting. The student will practice and consolidate after school. “One-stop” solves the learning needs of the three stages of online flipped classroom and demonstrates online flipped classroom teaching effect.
{"title":"A One-Stop Organic Chemistry Online Flipped Classroom Teaching Practice Based on MOOC","authors":"Minhui Cao, Wei Shi, Honghu Jiang, Shen Xu","doi":"10.3866/pku.dxhx202004025","DOIUrl":"https://doi.org/10.3866/pku.dxhx202004025","url":null,"abstract":"Under the case of novel coronavirus (COVID 19), and in response to the Ministry of Education’s call for “postponement of school without suspension of learning”, online teaching should be equivalent to the real class teaching. Based on Chinese University MOOC platform, this paper establishes SPOC on campus with the open online course Organic Chemistry as the online learning resource. Before class, students learn online video and self-testing. The teacher will answer questions and interact with students through live broadcasting. The student will practice and consolidate after school. “One-stop” solves the learning needs of the three stages of online flipped classroom and demonstrates online flipped classroom teaching effect.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202003050
Ying Ma, Heng Zhang, Qi-Long Song, Qi-Gao Hu
: Due to the outbreak of the COVID-19 epidemic, the new semester has been postponed. But in order to continue teaching and student training work, teachers from colleges are efficiently utilizing internet education resources, and actively carry out online teaching. This paper uses one of the virtual simulation experiment projects at Shandong University, as an example. It introduces how to conduct online laboratory training and teaching in inorganic and analytical chemistry laboratory by utilizing the combination of virtual simulation experiment projects and online resources, and help student learn the theory and operation of iodometry titration.
{"title":"Virtual Simulation Experimental System in Online Teaching of the Laboratory Course","authors":"Ying Ma, Heng Zhang, Qi-Long Song, Qi-Gao Hu","doi":"10.3866/pku.dxhx202003050","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003050","url":null,"abstract":": Due to the outbreak of the COVID-19 epidemic, the new semester has been postponed. But in order to continue teaching and student training work, teachers from colleges are efficiently utilizing internet education resources, and actively carry out online teaching. This paper uses one of the virtual simulation experiment projects at Shandong University, as an example. It introduces how to conduct online laboratory training and teaching in inorganic and analytical chemistry laboratory by utilizing the combination of virtual simulation experiment projects and online resources, and help student learn the theory and operation of iodometry titration.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202004064
Shuang Mao
: Owing to the control and prevention of novel coronavirus, “online teaching” is generally suggested. The online teaching quality depends on teaching skills and students’ enthusiasm. The teaching practice of structural chemistry based on teaching and research activities, electronic records, group sharing and course ideology are introduced.
{"title":"Teaching Practice of Structural Chemistry under the Novel Coronavirus: Combining Teaching and Research to Improve Learning Enthusiasm","authors":"Shuang Mao","doi":"10.3866/pku.dxhx202004064","DOIUrl":"https://doi.org/10.3866/pku.dxhx202004064","url":null,"abstract":": Owing to the control and prevention of novel coronavirus, “online teaching” is generally suggested. The online teaching quality depends on teaching skills and students’ enthusiasm. The teaching practice of structural chemistry based on teaching and research activities, electronic records, group sharing and course ideology are introduced.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70223093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Focus on the Water Quality of Yangtze River: Social Practice of “Trace of the Green Line”","authors":"Yiping Zhang, Shuqin Zhang, Zirun Zhao, Zhiheng Xu, Songyang Wang, Yuhang Zhang, M. Yang, Xuanlin Yu, Yaxian Zhu","doi":"10.3866/pku.dxhx202004075","DOIUrl":"https://doi.org/10.3866/pku.dxhx202004075","url":null,"abstract":"","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70223113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the device for phase diagram development experiment has been modified, which can be used to measure the boiling point and dew point of vapor-liquid equilibrium system simultaneously. In addition, the vapor-liquid phase diagrams of cyclohexane-ethanol under the conditions of no heat preservation, heat preservation and temperature compensation are drawn and compared. Results show that there is a great difference between the temperatures of boiling point and dew point both for the vapor-liquid equilibrium system with the simple heat preservation or without the heat preservation, and the vapor-phase lines based on the boiling point temperature are seriously distorted. With the temperature compensation for the system, the two vapor-phase lines according to the boiling point and the dew point temperature are in good agreement, which means the problem of vapor-phase fractionation effect has been solved.
{"title":"Temperature Compensation Method to Solve the Fractionation Effect in the Experiment of Binary Vapor-Liquid Equilibrium System Phase Diagram","authors":"Liping Song, Yating Wang, Ou Zheng, Shuting Wu, Shuying Zhu, Jianzhong Chen","doi":"10.3866/pku.dxhx201905002","DOIUrl":"https://doi.org/10.3866/pku.dxhx201905002","url":null,"abstract":"In this paper, the device for phase diagram development experiment has been modified, which can be used to measure the boiling point and dew point of vapor-liquid equilibrium system simultaneously. In addition, the vapor-liquid phase diagrams of cyclohexane-ethanol under the conditions of no heat preservation, heat preservation and temperature compensation are drawn and compared. Results show that there is a great difference between the temperatures of boiling point and dew point both for the vapor-liquid equilibrium system with the simple heat preservation or without the heat preservation, and the vapor-phase lines based on the boiling point temperature are seriously distorted. With the temperature compensation for the system, the two vapor-phase lines according to the boiling point and the dew point temperature are in good agreement, which means the problem of vapor-phase fractionation effect has been solved.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70215292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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