Volume 21, Issue 9 2410848
Research Article

Advanced Functional NiCo2S4@CoMo2S4 Heterojunction Couple as Electrode for Hydrogen Production via Energy-Saving Urea Oxidation

Njemuwa Nwaji

Corresponding Author

Njemuwa Nwaji

Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B Str., Warsaw, 02–106 Poland

E-mail: [email protected]; [email protected]; [email protected]

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Boka Fikadu

Boka Fikadu

Department Chemistry, Chungnam National University, Daejeon, 34134 South Korea

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Magdalena Osial

Magdalena Osial

Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B Str., Warsaw, 02–106 Poland

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Magdalena Warczak

Magdalena Warczak

Faculty of Chemical Technology and Engineering, Bydgoszcz University of Science and Technology, Seminaryjna 3 street, Bydgoszcz, 85–326 Poland

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Zahra Moazzami Goudarzi

Zahra Moazzami Goudarzi

Laboratory of Polymers and Biomaterials, Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B, Warsaw, 02–106 Poland

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Marianna Gniadek

Marianna Gniadek

Faculty of Chemistry, University of Warsaw, Pasteura 1 Str., Warsaw, 02–093 Poland

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Sohrab Asgaran

Sohrab Asgaran

Helmaco Sp. Z o.o. Company, Ostrobramska 101/335K, Warszawa, 04–041 Poland

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Jaebeom Lee

Corresponding Author

Jaebeom Lee

Department Chemistry, Chungnam National University, Daejeon, 34134 South Korea

Department Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134 South Korea

E-mail: [email protected]; [email protected]; [email protected]

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Michael Giersig

Corresponding Author

Michael Giersig

Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B Str., Warsaw, 02–106 Poland

E-mail: [email protected]; [email protected]; [email protected]

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First published: 14 January 2025
Citations: 3

Abstract

The urea oxidation reaction (UOR) is characterized by a lower overpotential compared to the oxygen evolution reaction (OER) during electrolysis, which facilitates the hydrogen evolution reaction (HER) at the cathode. Charge distribution, which can be modulated by the introduction of a heterostructure, plays a key role in enhancing the adsorption and cleavage of chemical groups within urea molecules. Herein, a facile all-room temperature synthesis of functional heterojunction NiCo2S4/CoMo2S4 grown on carbon cloth (CC) is presented, and the as-prepared electrode served as a catalyst for simultaneous hydrogen evolution and urea oxidation reaction. The Density Functional Theory (DFT) study reveals spontaneous transfer of charge at the heterointerface of NiCo2S4/CoMo2S4, which triggers the formation of localized electrophilic/nucleophilic regions and facilitates the adsorption of electron donating/electron withdrawing group in urea molecules during the UOR. The NiCo2S4/CoMo2S4// NiCo2S4/CoMo2S4 electrode pair required only a cell voltage of 1.17 and 1.18 V to deliver a current density of 10 and 100 mA cm−2 respectively in urea electrolysis cell and display very good stability. Tests performed in real urine samples show similar catalytic performance to urea electrolytes, making the work one of the best transition metal-based catalysts for UOR applications, promising both efficient hydrogen production and urea decomposition.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this work are available from the corresponding author upon reasonable request.

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