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1,847 results on '"Wang, Jianji"'

156. Tuning d‐Band Structure of CuII in Coordinated Polymer via d–π Conjugation for Improving CO2 Electroreduction Selectivity toward C2 Products.

Author

Zhang, Fengtao, Wang, Peng, Zhao, Runyao, Wang, Yiding, Wang, Jianji, Han, Buxing, and Liu, Zhimin

Subjects
RESEARCH & development, CONJUGATED polymers, POLYMERS, COPPER chlorides, COUPLING reactions (Chemistry), STANDARD hydrogen electrode, COORDINATION polymers
Abstract

Copper‐coordinated catalysts are reported to be effective for electrocatalytic CO2 reduction reaction (CO2RR) to C2 products but suffer from low selectivity. Herein a strategy was developed to tune the d‐band structure of CuII via coordinating with aromatic ligands to form Cu‐based conjugated polymers for CO2RR to C2 chemicals. The catalysts derived from copper chloride coordinating with tetraminobenzoquinone (TABQ) and with 1,2,4,5‐benzenetetramine possessed high‐density and compact Cu single‐atom sites and displayed high activity for CO2RR to C2 products. Especially, Cu‐TABQ exhibited a maximum C2 faradaic efficiency of 63.2 % with a current density of 423 mA cm−2 at −1.17 V (vs. reversible hydrogen electrode). Density functional theory calculations indicated that the TABQ linker possessing C=O groups significantly widened the d‐band of coordinated CuII, which facilitated binding of *CO intermediate on the catalyst and thus enhanced C−C coupling. This work provides mechanistic insight into the CuII‐coordinated polymers for CO2RR with high selectivity toward C2 products. [ABSTRACT FROM AUTHOR]

Published
2022
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178. Designing covalent organic frameworks with Co-O4 atomic sites for efficient CO2 photoreduction.

Author

Zhang, Qian, Gao, Shuaiqi, Guo, Yingying, Wang, Huiyong, Wei, Jishi, Su, Xiaofang, Zhang, Hucheng, Liu, Zhimin, and Wang, Jianji

Subjects
PHOTOREDUCTION, ELECTRON-hole recombination, VISIBLE spectra, SINGLE molecules, ELECTRON affinity, ORGANIC dyes, OXYGEN reduction
Abstract

Cobalt coordinated covalent organic frameworks have attracted increasing interest in the field of CO2 photoreduction to CO, owing to their high electron affinity and predesigned structures. However, achieving high conversion efficiency is challenging since most Co related coordination environments facilitate fast recombination of photogenerated electron-hole pairs. Here, we design two kinds of Co-COF catalysts with oxygen coordinated Co atoms and find that after tuning of coordination environment, the reported Co framework catalyst with Co-O4 sites exhibits a high CO production rate of 18000 µmol g−1 h−1 with selectivity as high as 95.7% under visible light irradiation. From in/ex-situ spectral characterizations and theoretical calculations, it is revealed that the predesigned Co-O4 sites significantly facilitate the carrier migration in framework matrixes and inhibit the recombination of photogenerated electron-hole pairs in the photocatalytic process. This work opens a way for the design of high-performance catalysts for CO2 photoreduction. A class of inexpensive aminoanthraquinone organic dyes are shown to facilitate visible-light-driven CO2 reduction. Overall reaction efficiencies were found to be optimal when both electron donating and accepting groups were on a single dye molecule. [ABSTRACT FROM AUTHOR]

Published
2023
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191. Development of a Commercial Process for Deucravacitinib, a Deuterated API for TYK2 Inhibition

Author

Treitler, Daniel S., primary, Soumeillant, Maxime C., additional, Simmons, Eric M., additional, Lin, Dong, additional, Inankur, Bahar, additional, Rogers, Amanda J., additional, Dummeldinger, Michael, additional, Kolotuchin, Sergei, additional, Chan, Collin, additional, Li, Jun, additional, Freitag, Adam, additional, Lora Gonzalez, Federico, additional, Smith, Michael J., additional, Sfouggatakis, Chris, additional, Wang, Jianji, additional, Benkovics, Tamas, additional, Deerberg, Joerg, additional, Simpson, James H., additional, Chen, Ke, additional, and Tymonko, Steven, additional

Published
2022
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193. Ag Single Atoms Anchored on CeO2with Interfacial Oxygen Vacancies for Efficient CO2Electroreduction

Author

Liang, Yubo, Wu, Cailing, Meng, Songjie, Lu, Zhansheng, Zhao, Runyao, Wang, Huiyong, Liu, Zhimin, and Wang, Jianji

Abstract

Ag single-atom catalysts (SACs) have great potential in selective electrocatalysis of the CO2reduction reaction (CO2RR) to CO, while it is still a challenge to achieve high current density and high atom efficiency simultaneously. Here, we present a new and simple in situadsorption–reduction method to prepare Ag SACs supported on CeO2(Ag1/CeO2). It is found that Ag single atoms are anchored on CeO2through strong metal–support interaction (SMSI), and each Ag atom is accompanied with three interfacial oxygen vacancies. This Ag1/CeO2exhibits high performance in the electrocatalytic CO2RR with a high CO faradaic efficiency (FE) of >95% under a wide potential range. The turnover frequency (TOF) value can reach 50,310 h–1at FECO= 99.5% in H-cells. Notably, Ag1/CeO2achieves an industrial-grade current density of 403 mA cm–2with a high FECOof 97.2% in flow cells. Experimental results combined with density functional theory calculation revealed that this superior performance was mainly ascribed to the existence of interfacial oxygen vacancies, which lead to the formation of Ag–O–Ce3+atomic interfaces, and activates the Ce3+–O structures as the synergistic active center of Ag, thus promoting CO2adsorption and activation and reducing the reaction potential barrier of *COOH-to-*CO.

Published
2023
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