Efficient synthesis of PdIr nanocatalysts with controllable surface composition for electrochemical oxidation of methanol.
Saved in:
| Title: | Efficient synthesis of PdIr nanocatalysts with controllable surface composition for electrochemical oxidation of methanol. |
|---|---|
| Authors: | Fu, Ce1 (AUTHOR), Wang, Pan1 (AUTHOR), Zhang, Rong-Hua1 (AUTHOR) rhzhang@ctgu.edu.cn, Yan, Luo-Yi1 (AUTHOR), Cheng, Zheng1 (AUTHOR), Zhang, Xin1 (AUTHOR), Zhou, Xin-Wen1 (AUTHOR) xwzhou@ctgu.edu.cn |
| Source: | Fuel (0016-2361). Jan2023:Part 1, Vol. 332, pN.PAG-N.PAG. 1p. |
| Subjects: | Ethylene oxide, Structure-activity relationships, Catalyst structure, Oxidation of methanol, Electronic structure, Electrocatalysis, Polyethylene oxide |
| Abstract: | • The 3D PdIr uniform alloy with KI showed enhanced MOR activity and stability, confirmed with the theoretical calculation. • The KI can be used to regulate the structure and surface composition of PdIr catalysts. • The 3D structure, bifunctional mechanism, synergistic catalytic and electronic structure of Ir are the main reasons for the enhanced MOR performance. Pure iridium (Ir) is easy to produce OH adsorbent species and has a wide range of applications in electrocatalysis. The structure–activity relationship between controlled synthesis and surface regulation of Ir-based alloys and their properties needs further study. When P123(poly (ethylene oxide)-poly (ethylene oxide)-poly (ethylene oxide)(PEO 20 -PPO 70 -PEO 20) is used as reducing agent and protective agent, the ir-rich core–shell structure PdIr@Ir catalyst can be obtained by the solution thermal method without adding KI, and the PdIr alloy can be obtained after the addition of KI. The complexation ability of KI can change the reduction rate of the precursor and regulate the surface composition of the catalyst. After optimizing the dose of KI, the PdIr-4 shows the highest methanol oxidation reaction (MOR) activity and anti-CO toxicity. The PdIr-2 catalysts with rich Ir on the surface showed high stability, possibly due to the gradual activation of Ir on the surface by PdIr inside. The results of experimental characterization and theoretical calculations show that the main reasons for the performance improvement of PdIr series catalysts are the special three-dimensional structure of PdIr, the bifunctional mechanism between Pd and Ir, especially the synergistic catalytic action of Ir and the effect of regulating the electron structure. The experimental results of this paper are expected to provide some ideas and guidance for Ir-based catalysts with high activity and high stability. [ABSTRACT FROM AUTHOR] |
| Copyright of Fuel (0016-2361) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. 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.) | |
| Database: | Engineering Source |
Be the first to leave a comment!
