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Facile sol-gel preparation of high-entropy multielemental electrocatalysts for efficient oxidation of methanol and urea

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Abstract

High-entropy multi-elemental (HEM) electrocatalysts present superior catalytic performance due to the efficient synergism of their components. HEM electrocatalysts are usually prepared through hydrothermal reactions or calcination, which could generate undesired heterogeneous structures that hinder the exploration of the structure-property relationship of these HEM electrocatalysts. Herein, we report a sol-gel method to synthesize homogeneous HEM electrocatalysts for electro-oxidation of methanol and urea (methanol oxidation reaction (MOR) and urea oxidation reaction (UOR)), through an acid-catalyzed gelation at room temperature. With Ni as the primary component for MOR and UOR, Co can reduce the overpotentials, while Fe can increase the catalytic activities and durability. Borate and phosphate can tune the charge distribution in active sites and speed up the reaction kinetics through fast proton transfer. Thus, the optimal Ni2Fe0.5Co0.5-BP HEM catalyst demonstrates superior catalytic activity together with good durability and great resistance to CO poisoning. In addition, a direct methanol fuel cell with Ni2Fe0.5Co0.5-BP electrode can not only provide power, but also produce formic acid with high yield and high Faraday efficiency. This work presents a simple strategy to prepare high-performance HEM electrocatalysts for fuel cells and production of value-added chemicals.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21778052 and 21975240) and by the Fundamental Research Funds for the Central Universities (No. WK2060190102).

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Authors and Affiliations

  1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China

    Talifhani Mushiana, Mustafa Khan, Muhammad Imran Abdullah & Mingming Ma

  2. School of Biology, Food and Environment, Hefei University, Hefei, 230022, China

    Ning Zhang

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  1. Talifhani Mushiana
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  2. Mustafa Khan
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  4. Ning Zhang
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Mushiana, T., Khan, M., Abdullah, M.I. et al. Facile sol-gel preparation of high-entropy multielemental electrocatalysts for efficient oxidation of methanol and urea. Nano Res. 15, 5014–5023 (2022). https://doi.org/10.1007/s12274-022-4186-9

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