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Nano Research 2022, 15(6): 5014-5023 https://doi.org/10.1007/s12274-022-4186-9
Research Article | Issue | Published: 17 March 2022

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

Show Author's Information Talifhani Mushiana1,  Mustafa Khan1,  Muhammad Imran Abdullah1,  Ning Zhang2( ),  Mingming Ma1( )
Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
School of Biology, Food and Environment, Hefei University, Hefei 230022, China
Keywords:
sol-gel, formic acid, catalytic oxidation reaction, high-entropy multi-elemental electrocatalysts
Topics:
Electrocatalysis
Cite this article:
Mushiana T, Khan M, Abdullah MI, et al. Facile sol-gel preparation of high-entropy multielemental electrocatalysts for efficient oxidation of methanol and urea. Nano Research, 2022, 15(6): 5014-5023. https://doi.org/10.1007/s12274-022-4186-9
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Abstract Full text Electronic supplementary material About this article

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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Electronic supplementary material
About this article

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

Show Author's information Talifhani Mushiana1, Mustafa Khan1, Muhammad Imran Abdullah1, Ning Zhang2( ), Mingming Ma1( )
Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
School of Biology, Food and Environment, Hefei University, Hefei 230022, China

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.

Keywords: sol-gel, formic acid, catalytic oxidation reaction, high-entropy multi-elemental electrocatalysts

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Publication history
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Acknowledgements

Publication history

Received: 24 November 2021
Revised: 21 January 2022
Accepted: 24 January 2022
Published: 17 March 2022
Issue date: April 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

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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