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Updated: May 13, 2025
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Interfacial Electronic Interactions Induced by Self-Assembled Amorphous RuCo Bimetallenes/MXene Heterostructures for
Qi Zhang1, Jing Zhou1, Cheng-Wei Kao2
1College of Materials Science and Engineering, Hunan University, Changsha, Hunan, 410082, China.
Abstract:
Electrocatalytic nitrate reduction to ammonia (NO3RR) is an attractive green route to generate valuable ammonia and remove nitrates in industrial processes. However, under the intense competition of hydrogen evolution reactions (HER), it is a key challenge to improve the selectivity and reduce the energy consumption of the nitrate reduction reaction. Herein, a unique amorphous RuCo Bimetallenes confined on Ti3C2Tx-MXene (RuCo/Ti3C2Tx) is reported as a highly efficient NO3RR catalyst, showing a remarkable Faradaic efficiency for ammonia of 94.7% at -0.2 V versus reversible hydrogen electrode (RHE), with the corresponding high ammonia yield rate of 98.8 mg h-1 mgcat -1 at -0.6 V versus RHE. Significantly, the RuCo/Ti3C2Tx heterostructures are able to operate stably at 1 A cm-2 for over 100 h under membrane electrode assembly (MEA) conditions with a stabilized NH3 Faraday efficiency. In-depth theoretical and operando spectroscopic investigations unveil that the in situ generation of heterojunction via interfacial Ru/Co─O bridges can induce charge redistribution through Ru/Co─O-Ti structure and modulate the electronic structure of RuCo Bimetallenes, significantly promoting *H production and the adsorption and activation of reactants/intermediates, while suppressing HER, thereby boosting NO3RR performance. This study offers a new insight the metal-support interaction for the development of high-performance electrocatalysts.
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