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623 results on '"Hao, Qingli"'

135. High Efficient Catalyst of N‐doped Carbon Modified Copper Containing Rich Cu−N−C Active Sites for Electrocatalytic CO2 Reduction.

Author

Sun, Yingxin, Jing, Haiyan, Wu, Zongdeng, Yu, Jia, Gao, Haiwen, Zhang, Yuehua, He, Guangyu, Lei, Wu, and Hao, Qingli

Subjects
ELECTROLYTIC reduction, CATALYSTS, COPPER, STANDARD hydrogen electrode, MELAMINE, CARBON dioxide reduction
Abstract

The synthesis of multi‐carbon products through electrochemical CO2 reduction reactions has attracted great interest from researchers. Herein, nitrogen‐ and carbon‐doped copper nanocatalyst (NC−Cu) containing abundant Cu−N−C active sites was prepared by thermal decomposition of the complexes containing copper and melamine. The NC−Cu catalyst exhibited an ideal current density of 22 mA cm−2 at −0.93 V versus reversible hydrogen electrode (vs. RHE) in CO2‐saturated 0.5 M KHCO3 medium, with ethanol as the predominant product at −0.93 V (vs. RHE) and a maximum Faraday efficiency of 31 %. The current density of the catalyst remained almost unchanged after 20 h of electrolysis, indicating its excellent stability. The excellent catalytic ability is attributed to the abundant Cu−N−C active sites of NC−Cu with 3D porous microstructure. [ABSTRACT FROM AUTHOR]

Published
2022
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141. Electrodeposited molybdenum-doped Co3O4 nanosheet arrays for high-performance and stable hybrid supercapacitors.

Author

Shen, Honglong, Yang, Xiaoqiang, Song, Juanjuan, Gao, Haiwen, Wu, Zongdeng, Yu, Jia, Lei, Wu, Yang, Jiazhi, He, Guangyu, and Hao, Qingli

Subjects
TRANSITION metal oxides, SUPERCAPACITORS, BAND gaps, POWER density
Abstract

Long-cycle stability and high-energy density are big challenges for developing high-performance hybrid supercapacitor (HSC) electrode materials. In this work, molybdenum-doped Co3O4 nanosheets arrays on nickel foam (noted as MoxCo1.5−xO/NF) are successfully prepared via facile one-step electrodeposition followed by annealing for hybrid supercapacitors. The experimental and calculated results indicate that the band gap modification and conductivity enhancement of MoxCo1.5−xO lead to excellent capacitive performance due to the doping of Mo into Co3O4. The as-prepared Mo0.25Co1.25/NF electrode demonstrates a high specific capacity of 128.2 mAh g−1 (923 F g−1) at 1 A g−1 (60% higher than the undoped Co3O4) and superior cycle stability with 95.2% capacity retention after 10,000 cycles at 10 A g−1. The assembled HSC delivers high-energy density of 64.3 Wh kg−1 at the power density of 794.1 W kg−1 and with 87.7% capacity retention after 10,000 cycles. This work can present a new strategy to fabricate the three-dimensional high-performance integrated electrode materials by a facile electrodeposition for heteroatom-doped transition metal oxide for high-performance supercapacitors. [ABSTRACT FROM AUTHOR]

Published
2022
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148. Defect-rich walnut-like copper-doped Ni(PO3)2 catalyst towards ammonia borane electrooxidation reaction with high performance.

Author

Yu, Jia, Jing, Haiyan, Zhao, Peng, Lu, Keren, Song, Juanjuan, Wu, Zongdeng, Wu, Haoxuan, Liu, Boyuan, Lei, Wu, and Hao, Qingli

Abstract

Ammonia borane (NH3BH3, AB), a carbon-free-energy material, has attracted enormous attention not only as the hydrogen storage source but also as the anodic fuel for direct AB fuel cells (DABFCs). The rational design of electrocatalysts for AB oxidation reaction (ABOR) is the key to improve the electrochemical performance of DABFCs. Herein, copper-doped nickel metaphosphates (Cu–Ni(PO3)2) with modulated electronic structure and abundant lattice defects through tuning dopant ratios are synthesized and applied towards ABOR for the first time. The optimal Cu–Ni(PO3)2 catalyst shows excellent electrocatalytic performance with an onset potential of −0.282 V versus the reversible hydrogen electrode (vs. RHE) which is superior to the published noble-metal and other transition metal electrocatalysts. And the density functional theory (DFT) computations verified that the active sites in the Cu–Ni(PO3)2 towards ABOR are the dopant Cu ions, the optimized Ni ions, and the induced lattice distortions, which indicates that the doping of Cu ions can indeed improve the electrocatalytic activity of the host catalyst Ni(PO3)2. This work provides a new candidate for the electrocatalyst of ABOR. [ABSTRACT FROM AUTHOR]

Published
2022
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