High-entropy type Fe-Ni-P-O-C amorphous Nanospheres: Remarkable Fe-ion migration induced efficient surface reconstruction for oxygen evolution reaction

High-entropy type Fe-Ni-P-O-C amorphous Nanospheres: Remarkable Fe-ion migration induced efficient surface reconstruction for oxygen evolution reaction

Amorphous transition metal compounds (a-TMC) become one of the most promising pre-catalysts toward oxygen evolution reaction (OER) due to their high-entropy nature and flexible self-reconstruction to highly active derivatives. However, the loosen bonds inside the amorphous structure make it an elect...

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Bibliographic Details
Main Authors: Shiliu Yang, Xinhe Liu, Xunlu Wang, Yan Lin, Sina Cheng, Hongyang Gao, Fan Zhang, Li Li, Jiabiao Lian, Ulla Lassi, Ruguang Ma
Format: Article
Language:English
Published: KeAi Communications Co. Ltd. 2025-10-01
Series:Advanced Powder Materials
Subjects:
High-entropy pre-catalysts
Amorphous nanospheres
Surface reconstruction
Oxygen evolution reaction
Zn-air batteries
Online Access:http://www.sciencedirect.com/science/article/pii/S2772834X2500065X
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Summary:Amorphous transition metal compounds (a-TMC) become one of the most promising pre-catalysts toward oxygen evolution reaction (OER) due to their high-entropy nature and flexible self-reconstruction to highly active derivatives. However, the loosen bonds inside the amorphous structure make it an electronic insulator with unstable structure. Here, monodispersed Ni2+-phytate nanospheres implanted by Fe3+ ions (NSFeNiPA) were firstly prepared and subsequently transferred into homogeneous high-entropy type Fe-Ni-P-O-C amorphous nanospheres (CNSFeNiPO). It is shown that the CNSFeNiPO presents robust structure and remarkable Fe ions migration during potential-driven activation process, which benefits efficient surface reconstruction and spherical morphology preservation. The CNSFeNiPO with low mass loading of 0.1 ​mg/cm2 could deliver small overpotential of 270 ​mV at 10 ​mA ​cm−2 and almost 100% retention of the initial current density after 10 ​h test. The improved electrocatalytic activity is attributed to the boosted electron transfer from Ni sites to O-containing intermediates by introduction of Fe and P atoms. Moreover, rechargeable Zn-air battery with CNSFeNiPO ​+ ​Pt/C could achieve lower charge potential platform and better cycling performance than that with commercial RuO2+Pt/C. This work provides new insights into the design and understanding of high-entropy amorphous pre-catalysts toward OER.
ISSN:2772-834X

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