Dichalcogenides as Emerging Electrocatalysts for Efficient Ammonia Synthesis: A Focus on Mechanisms and Theoretical Potentials

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract Developing sustainable technologies for ammonia production through electrochemical reactions offers a promising alternative by leveraging renewable energy sources to produce under ambient conditions. These methods include nitrogen reduction reaction (NRR), nitric oxide (NORR), nitrite (NO 2 RR), and nitrate 3 RR). Optimizing efficiency (EE) in synthesis has become increasingly crucial as commercialization approaches. Herein, this work comprehensive study of system EE improvements the theoretical voltage calculations based on pH expansion bifunctional catalysts like transition metal dichalcogenides (TMDs), which can efficiently catalyze oxygen evolution (OER) synthesis. The review summarizes pH‐dependent redox potential Pourbaix diagrams NRR, NO RR, offering insights into potential‐pH regions where oxides are reduced NH . Incorporating design enables researchers minimize losses better improve overall performance. Finally, wraps up exploring roles TMD different mechanisms identifying areas improvement. broader impact lies its transform alignment with global efforts reduce greenhouse gas emissions.

Language: Английский

Unraveling the Structural Evolution of Cobalt Sulfides in Electrocatalytic NO₃RR: the Inescapable Influence of Cl^–

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Electrochemical nitrate reduction (NO3RR) to ammonia is an attractive approach for mitigating NO3- pollution and producing valuable NH3. Cobalt-sulfur compounds are widely considered be potential electrocatalysts NO3RR. However, there still a lack of research on the probable structural evolution, long-term stability, reactive sites cobalt-based sulfides during catalysis. Herein, we have employed three cobalt (CoSx, where x = 8/9, 2, 1.097) with different sulfur contents as catalysts electrocatalytic NO3RR under alkaline conditions. At -0.8 V vs RHE, all these CoSx show promising performances that Faradaic efficiencies >80% high yield >1780 mmol h-1 gcat-1 NH3 production achieved. Through combination X-ray diffraction (XRD), transmission electron microscopy (TEM), other characterizations, it revealed easily converted into hydroxide This phenomenon seemingly contradictory thermodynamic prediction that, according Pourbaix diagram, should stable even catalytic condition. We suggest this due presence Cl- ions in electrolyte promote transformation toward Co(OH)2. Chloride commonly found both industrial settings natural water bodies challenging remove. The evolved Co(OH)2 species proposed responsible catalyzing NO3RR, especially process. study highlights inevitable evolution current conditions, offering theoretical guidance judicious selection design future catalysts.

Language: Английский

Atomic-level partial replacement of Co in cubic Co3O4 with Cu for effective and stable nitrate electroreduction

Electrochimica Acta, Journal Year: 2025, Volume and Issue: unknown, P. 146119 - 146119

Published: March 1, 2025

Language: Английский