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Your search keyword '"Bian, Xiaofei"' showing total 6 results
Start Over Author "Bian, Xiaofei" Journal applied surface science
6 results on '"Bian, Xiaofei"'

5. Fabrication of WO3/RGO/Ni:FeOOH heterostructure for synergistically enhancing photoelectrochemical water oxidation

Author

Wenjian Wu, Xiaofan Zhang, Bian Xiaofei, and Haitao Xu

Subjects
Photocurrent, Fabrication, Materials science, Kinetics, General Physics and Astronomy, Heterojunction, Surfaces and Interfaces, General Chemistry, Electrolyte, Condensed Matter Physics, Surfaces, Coatings and Films, Chemical engineering, Water splitting, Ternary operation, Faraday efficiency
Abstract

The instability and low activity of WO3 is the hot-topic for photoelectrochemical (PEC) water splitting, which is decreased by a sluggish interfacial kinetics and incomplete water oxidation. Aiming at such issues, we designed a ternary WO3/RGO/Ni:FeOOH photoanode, which exhibits 2.05 times larger photocurrent (1.32 mA cm−2) than the WO3 NFs in 0.5 M Na2SO4 electrolyte solution, accompanied with 83 mV cathodic shift of onset potential. These results demonstrates PEC response can occurs only in Ni:FeOOH but not FeOOH. Therefore, Ni:FeOOH acting as bi-functional modifier, can not only increase light absorption but also promote charge transfer process by forming p-n heterojunction with the WO3 NFs. Besides, RGO forming a continuously conducting network can further improve charge separation process. Owing to their synergistic effects, the Faradaic efficiency and stability are both improved compared to its counterparts and the bare WO3 NFs. This work may inspire the PEC application in other co-catalyst decorated systems.

Published
2021

6. Single-crystal nanoporous high-entropy (oxy)hydroxides nanosheets for electrocatalysis: Structure and electronic dual enhancement.

Author

Xu, Haitao, Hu, Yixuan, Lin, Xiaorong, Liu, Dan, Liang, Junfei, Bian, Xiaofei, Madhav Reddy, Kolan, and Qiu, Hua-Jun

Subjects
*OXYGEN evolution reactions, *ELECTRONIC structure, *ELECTROCATALYSIS, *METALS, *HYDROXIDES, *CRYSTAL growth, *NANOSTRUCTURED materials, *ENTROPY
Abstract

[Display omitted] • Single-crystal high-entropy (oxy)hydroxides were prepared through multication exchange. • The import of Al in a multicomponent (oxy)hydroxides would induce the formation of nanoporous structure. • The mixing of Ru with other metallic elements moderates the electronic structure for better OER performance. • This dynamic crystal growth strategy could extend to fabricate diversiform (oxy)hydroxides. High-entropy materials are new-fashioned electrocatalysts due to their interesting "cocktail effect". However, it is still a great challenge to synthesize single-crystal high-entropy nanomaterials such as (oxy)hydroxides due to the different crystal growth mode for different elements. Herein, we design a dynamic crystal growth strategy by multi-cation exchange to fabricate single-crystal high-entropy (oxy)hydroxides nanosheets. Nanoporous morphology can be achieved by incorporating Al ion into the multicomponent (oxy)hydroxides system after a reversible Al insertion-dissolution process. When adopted as potential electrocatalysts for oxygen evolution reaction (OER), we find that the seven-component ZnVNiCoFeAlRu-OHs single-crystal nanoporous nanosheets display a significantly improved OER performance with a low overpotential of 229 mV at 10 mA cm−2 and a shallow Tafel slope of 39.3 mV dec−1. Both XPS and DFT calculation reveal that Ru acted an electron dedicator could effectively moderate the overall electronic structures for better OER performance. This work develops an entropy and enthalpy driven multi-cation exchange strategy for synthesizing a library of single-crystal high-entropy (oxy)hydroxides for various applications. [ABSTRACT FROM AUTHOR]

Published
2023
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