Strong Electronic Interaction between Amorphous MnO_2 Nanosheets and Ultrafine Pd Nanoparticles toward Enhanced Oxygen Reduction and Ethylene Glycol Oxidation Reactions

Ying Wang; Jiali Liu; Hongjie YuanFan LiuTianjun HuBenqun Yang

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Strong Electronic Interaction between Amorphous MnO_2 Nanosheets and Ultrafine Pd Nanoparticles toward Enhanced Oxygen Reduction and Ethylene Glycol Oxidation Reactions

机译：Strong Electronic Interaction between Amorphous MnO_2 Nanosheets and Ultrafine Pd Nanoparticles toward Enhanced Oxygen Reduction and Ethylene Glycol Oxidation Reactions

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摘要

Strengthening the interface interaction between metal and support is an efficient strategy to improve the intrinsic activity and reduce the amount of noble metal. Amorphization of support is an effective approach for enhancing the metal-support interaction due to the numerous surface defects in amorphous structure. In this work, a Pd/a-MnO_2 electrocatalyst containing ultrafine and well-dispersive Pd nanoparticles and amorphous MnO_2 nanosheets is successfully synthesized via a simple and rapid wet chemical method. Differing from the crystal counterpart (Pd/c-MnO_2), the flexible structure of amorphous support can be more favorable to electron transfer and further enhance the metal-support interaction. The synergism between Pd and amorphous MnO_2 results in the downshift of the d-band center, which is beneficial for the desorption of critical intermediates both in oxygen reduction reaction (ORR) and in ethylene glycol oxidation (EGOR). Due to the lower ☆.OH desorption energy of Pd/a-MnO_2 surface, the rapid dissociation of ☆OH from Pd facilitates the formation of H_2O in ORR, thus demonstrating superior ORR performance comparable to Pt/C. For EGOR, the presence of amorphous MnO_2 promotes the formation of adsorbed OH species, which accelerates the desorption of intermediate CO from Pd sites, and thus exhibits excellent EGOR activity and stability.

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来源
《Advanced functional materials》 |2023年第21期|2211909.1-2211909.10|共10页
作者
Ying Wang; Jiali Liu; Hongjie YuanFan LiuTianjun HuBenqun Yang;
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作者单位

Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education & School of Chemistry and Materials Science of Shanxi Normal University TaiYuan 030032, China;

College of Chemical Engineering and Technology Tianshui Normal University TianShui 741001, China;

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amorphous oxide; ethylene glycol oxidation; oxygen reduction reaction; synergetic effects;

Strong Electronic Interaction between Amorphous MnO_2 Nanosheets and Ultrafine Pd Nanoparticles toward Enhanced Oxygen Reduction and Ethylene Glycol Oxidation Reactions

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