Article
Materials Science, Multidisciplinary
Lijuan Yang, Hui Ding, Guancheng Xu, Li Zhang, Bei Wei
Summary: Transition metal nitrogen-doped carbon catalysts have been explored as potential alternatives to Pt-based electrocatalysts for oxygen reduction reaction. This study successfully synthesized porous cobalt N-doped carbon materials with a core-shell nanostructure, which exhibited superior ORR performance compared to commercial Pt/C catalysts. By replacing 5% Zn with Co in the precursor, the Co-5-N-C-900 catalyst showed higher half-wave potential and diffusion-limited current density, as well as enhanced long-time stability.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Applied
Giorgiana Denisa Bisag, Silvia Ruggieri, Mariafrancesca Fochi, Luca Bernardi
Summary: Stabilised sulfur ylides reacted with salicylaldehydes under catalyst- and substrate-dependent conditions, forming either 2H-chromenes or dihydrobenzofurans. Unusual mechanisms were investigated, leading to the proposal of two unique reaction routes involving two ylide units. These pathways were validated by selective switches achieved through modifying the nucleophilicity of the sulfur ylide and adjusting the loading of the Bronsted acid catalyst.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Minju Kim, Miroslaw Dygas, Yaroslav Sobolev, Wiktor Beker, Qiang Zhuang, Tomasz Klucznik, Guillermo Ahumada, Juan Carlos Ahumada, Bartosz A. Grzybowski
Summary: The tethering of organometallic catalysts onto nanoparticles, with the use of gating ligands, allows for control of substrate selectivity and site selectivity. The strategy of self-assembling macromolecular environments on nanoparticles can enhance the selectivity of catalysts, and should be guided by theoretical models.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Polymer Science
Ying Leng, Kai Jin, Tian Wang, Hui Sun
Summary: A facile preparation strategy is proposed to prepare nitrogen-doped carbon sponge loaded with fine cobalt nanoparticles by the direct pyrolysis of the cobalt ions adsorbed polymeric precursor. The resulting Co/CoO@NCS exhibits promising catalytic activity toward oxygen reduction reaction, making it a potential candidate for efficient electrocatalysis.
Article
Chemistry, Physical
Jin Yan, Xiangjun Zheng, Chaohui Wei, Zhihui Sun, Kai Zeng, Liwei Shen, Jiawen Sun, Mark H. Rummeli, Ruizhi Yang
Summary: The study demonstrated the synthesis of nitrogen-doped hollow carbon polyhedrons with exceptional ORR electrocatalytic activity and long-term stability, providing a new approach for designing high-performance electrocatalysts.
Article
Nanoscience & Nanotechnology
Xuanzhao Lu, Zhuo Liu, Jian-Rong Zhang, Yang Zhou, Linlin Wang, Jun-Jie Zhu
Summary: The challenge in designing bio-chemical hybrid catalysts is the inability to maintain the initial catalytic performance of bio-catalysts or chemical catalysts. We report a general method for synthesizing bio-chemical hybrid catalysts using a natural enzyme scaffold-confined metal nanocluster. The enzyme-confined metal nanocluster hybrid catalyst shows improved catalytic performance due to the synergistic effect.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Melina Zysler, Enrique Carbo-Argibay, Paulo J. Ferreira, David Zitoun
Summary: This paper presents a solvothermal method for synthesizing carbon-supported octahedral PtCu NPs and analyzes the relationship between their structure and durability. It is found that using a specific capping agent and synthesis duration can enhance the stability of the material.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Lu Yang, Haifu Zhang, Peipei Tao, Xinhuan Lu, Xixi Li, Chenlong Wang, Beibei Wang, Fanfan Yue, Dan Zhou, Qinghua Xia
Summary: The synthesis of spherical bimetal ZnCo-MOF materials was achieved using a hydrothermal rotacrystallization method, with their catalytic activity on air epoxidation of mixed biolefins enhanced by microwaves. Among the synthesized catalysts, Zn0.1Co1-MOF-H-150 rpm exhibited the highest acidic content and strongest acidity, showing the best performance in the epoxidation reaction. The Zn0.1Co1-MOF catalyst could be recycled six times without significant loss of catalytic activity, demonstrating its stability under microwave conditions.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Ali Raza, Shanza Rauf Khan, Sarmed Ali, Saba Jamil, Shamsa Bibi
Summary: A microgel catalytic system loaded with bimetallic nanoparticles was synthesized to reduce organic dyes and nitro compounds. The hybrid microgel was characterized using various techniques, revealing an average size of 139 nm and a polydispersity index of 0.313, indicating homogeneous dispersion of nanoparticles within the microgel. The synthesized hybrid microgels were used as catalysts for the reduction of various compounds, with CV, CR, and EBT showing the highest apparent rate constants.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Organic
Steven M. Langdon, Michel Gravel
Summary: A route for the synthesis of 1,2,4-triazolium salts via oxidation of a thione precursor is demonstrated, with overall yields of 20-63%. Isolation and purification of the salts are simplified compared to traditional synthetic routes, and a variety of salts can be synthesized by late-stage selection of the counterion. These salts exhibit an appreciable counterion effect in both Stetter and cross-benzoin reactions.
Article
Chemistry, Applied
Hyunwoo Ha, Changsoo Lee, Joon Sik Park, Choong-Heui Chung, Sangyeob Lee, Graeme Henkelman, Hyun You Kim, Kihyun Shin
Summary: We investigated the potential application of graphene-encapsulated monometallic and bimetallic catalysts in Li-air batteries. The Co@C system was identified as the most exceptional monometallic catalyst, while the FeCo@C catalyst showed unparalleled activity in both monometallic and bimetallic systems. This study emphasizes the importance of considering individual potential differences for developing efficient catalysts in Li-air battery applications.
Article
Chemistry, Physical
Jae-Hyeok Park, Kyusung Kim, Xiaoyang Wang, Miftakhul Huda, Yasuyuki Sawada, Yutaka Matsuo, Nagahiro Saito, Masaya Kawasumi
Summary: Graphene encapsulation of PtFe core-shell catalyst synthesized by the solution plasma (SP) process improves both catalytic performance and durability of polymer electrolyte fuel cells (PEFCs), suggesting a novel and attractive catalyst synthesis method.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Taylor L. Soucy, Yingshuo Liu, Jonah B. Eisenberg, Charles C. L. McCrory
Summary: Incorporating graphite powder into polymer-encapsulated cobalt phthalocyanine was found to enhance the activity for the electrochemical reduction of CO2. The activity increased with GP loading at low levels, but plateaued at higher GP loadings due to sufficiently fast charge transfer. Axial coordination remains important for the activity, even in the presence of graphite powder support.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Dan Zhang, Carlos Jarava-Barrera, Sebastien Bontemps
Summary: The selective dimerization of CO2 into glycolaldehyde is achieved in a one-pot two-step process via formaldehyde as a key intermediate. The hybrid organometallic/organic catalytic system shows good reactivity under mild conditions and low catalytic loadings, resulting in a promising overall yield of glycolaldehyde. The study demonstrates the potential of glycolaldehyde in various reactions, including dimerization and a tri-component reaction generating C-N and C-C bonds.
Article
Chemistry, Physical
Gongshu Wang, Zhuang Hu, Zhangpei Chen, Jiwei Wang, Jianshe Hu, Xiaoxu Xu
Summary: Developing efficient and recoverable palladium catalysts is important. In this study, nitrogen-doped macroporous chitosan carbon microspheres (MCM) were prepared using emulsion polymerization, and core-shell structured MCM@Pd@COF catalysts were developed. These catalysts efficiently catalyzed Suzuki coupling reactions and the reduction of 4-nitrophenol, and showed high stability and photocatalytic properties under visible light irradiation. Mechanistic investigation revealed the efficient production of radical species under visible light, driving the photocatalytic degradation of organic dyes. The catalytic activity of MCM@Pd@COF remained unchanged after multiple uses.
APPLIED SURFACE SCIENCE
(2023)