التفاصيل البيبلوغرافية
| العنوان: |
In-situ formed NiS/Ni coupled interface for efficient oxygen evolution and hydrogen evolution. |
| المؤلفون: |
Yan, Chaoyi, Huang, Jianwen, Wu, Chunyang, Li, Yaoyao, Tan, Yuchuan, Zhang, Luying, Sun, Yinghui, Huang, Xiaona, Xiong, Jie |
| المصدر: |
Journal of Materials Science & Technology; Apr2020, Vol. 42, p10-16, 7p |
| مصطلحات موضوعية: |
HYDROGEN evolution reactions, PLATINUM nanoparticles, OXYGEN evolution reactions, X-ray photoelectron spectroscopy, SURFACE analysis, ACTIVATION energy, CHARGE exchange |
| مستخلص: |
• NiS nanocrystals were in situ prepared on the surface of Ni nanoparticles via fast and controllable sulfurizing. • The strongly coupled NiS/Ni interface strengthens the electron transfer between Ni and NiS. • Electro-enriched S sites boost the catalytic activity of HER. • NiS/Ni interface facilitates the formation of Ni oxyhydroxide for OER. High-performance electrocatalysts for water splitting are desired due to the urgent requirement of clean and sustainable hydrogen production. To reduce the energy barrier, herein, we adopt a facile in-situ surface modification strategy to develop a low-cost and efficient electrocatalyst for water splitting. The synthesized mulberry-like NiS/Ni nanoparticles exhibit excellent catalytic performance for water splitting. Small overpotentials of 301 and 161 mV are needed to drive the current density of 10 mA cm−2 accompanying with remarkably low Tafel slopes of 46 and 74 mV dec−1 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. Meanwhile, a robust electrochemical stability is demonstrated. Further high-resolution X-ray photoelectron spectroscopy analyses reveal that the intrinsic HER activity improvement is attributed to the electron-enriched S on the strongly coupled NiS and Ni interface, which simultaneously facilitates the important electron transfer, consistent with the electrochemical impedance results. The post characterizations demonstrate that surface reconstructed oxyhydroxide contributes to the OER activity and NiS/Ni is an OER precatalyst. This structure construction with in-situ formation of active interface provides an effective way to design efficient electrocatalysts for energy conversion. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Materials Science & Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Supplemental Index |
