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Your search keyword '"Zhao, Chengyao"' showing total 16 results
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16 results on '"Zhao, Chengyao"'

5. Defect‐Driven Oxidation Enabled V2CTx MXene with Ultralong‐Cycling and High‐Rate Capability in Aqueous K+ Storage.

Author

Liu, Yujing, Liu, Qi, Zhao, Chengyao, Liu, Liping, Liu, Zhongqiu, Ying, Anguo, Pang, Zhibin, Sun, Xuping, Chen, Pu, and Chen, Guang

Subjects
IONIC liquids, LEWIS bases, AMORPHOUS carbon, ENERGY storage, PASSIVATION
Abstract

Owing to the adverse influences of irreversible oxidation, the development of MXene‐based materials, especially those with satisfactory performance and longevity for aqueous energy storage, continues to suffer severe challenges. Herein, the strategy of targeted passivation‐supported defect‐lock‐oxygen is conceived, whereby engineered the V2CTx material for controllable partial oxidation with enhanced regioselectivity. When the material works, inside the intrinsic defects, the outward diffusion of oxidation is confined by the Lewis bases around the defects, which allows for the controllable progress of oxidation. The defect‐locked oxygen oxidizes the exposed carbon, thus forming sufficient amorphous carbons for enhancing the capacitive‐type adsorption of K‐ions. Then the oxidized defects enabled the fast kinetics via the cross‐layer transport of K‐ions. Benefiting from the strategy, the electrode assembly V2CTx‐RTIL (V2CTx equipped with room temperature ionic liquid) exhibits high capacity, good rate capability, and ultra‐longevity compared with those of the MXene materials so far reported. This work presents the first strategy of targeted passivation‐supported defect‐lock‐oxygen for high‐rate capability and super long‐cycling aqueous K+ storage and hopefully would provide the inspiration for the future design of novel electrodes. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Polystyrene-supported phosphoric-acid catalyzed atroposelective construction of axially chiral N-aryl benzimidazoles

Author

Zhao, Chengyao, Liao, Jingyuan, Zhu, Yuxiang, Zhang, Yiying, Zhai, Lianjie, Huang, Junrong, and You, Hengzhi

Abstract

The significance of axial chiral compounds in asymmetric organic catalysis, functional materials, and pharmaceutical useful molecules has encouraged advancements in the atroposelective synthesis of such compounds. Herein, we report the first atroposelective construction of axially chiral N-aryl benzimidazoles catalyzed by a polymer-supported chiral phosphoric acid. A varied library of atropisomers has been synthesized in 30%-96% yield with 58%-98% enantiomeric excess (ee) under a straightforward reaction setup (without the use of molecular sieves). Notably, even after 12 cycles, the immobilized catalyst maintained its reactivity and selectivity (TON > 540).

Published
2024
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16. Optimal PID controller design in PMSM based on Improved Genetic Algorithm

Author

Ren Yu and Zhao Chengyao

Subjects
Engineering, Fitness function, business.industry, Crossover, PID controller, Control engineering, Servomechanism, Optimal control, law.invention, Control theory, law, Control system, Genetic algorithm, Algorithm design, business
Abstract

A novel PID controller design method based on Improved Genetic Algorithm is proposed in the paper for PMSM Servo system. By using real-coded chromosomes scheme, and strategies of protecting the best individual, accepting immigrations, as well as employing adaptive crossover and mutation operators, meanwhile, choose output-overshoot, rise time and steady error of the system as the fitness function to weight the system performance. The global searching ability and the convergence speed of the IGA are significantly improved, and the performance of the PID controller is optimized to satisfaction. Experiment results show that the novel PID controller design method can achieve a faster Motor response, better traceability and markedly improved control results.

Published
2010
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