Two-Dimensional Ti3C2 MXene Supported RuCo Catalyst for Improving the NH3 Yield of Electrocatalytic Nitrate Reduction Reaction

Abstract

To enhance the electrochemical synthesis of ammonia performance by accelerating the reaction kinetics of electrocatalytic Nitrate reduction reaction (NO₃⁻RR), it is crucial to develop electrocatalysts with high acitiity and selectivity of NO₃⁻RR. Herein, a Ru-doped Co-Ti₃C₂ catalyst was prepared for NO₃⁻RR in this work. In 0.1 M KOH & 0.1 M KNO₃ electrolyte, the Ru doped Co-Ti₃C₂ (nRu:nCo = 2:8, RuCo-Ti₃C₂-2:8) achieved a Faraday efficiency (FE) of 96.48% and an ammonia yield of 2261.99 µg cm⁻² h⁻¹ at −0.4 V vs. RHE. Compared with the Co-MXene catalyst and the Ru doped Co-Ti₃C₂ catalysts of other compositions, RuCo-Ti₃C₂-2:8 exhibited better ammonia yield and high FE. Moreover, the RuCo-Ti₃C₂-2:8 catalyst exhibited excellent stability of electrocatalytic NO₃⁻RR.