A modified carbonaceous nanocomposite was prepared using Nile blue (NB)–functionalized reduced graphene oxide (rGO) (rGO-NB) decorated by copper nanoparticles (CuNPs@rGO-NB). This unique graphene oxide-based electrocatalyst was cast on a copper plate electrode and used for efficient conversion of CO₂ to valuable products via electrochemical reduction in term of energy saving. The application of the represented electrocatalyst increased the electroactivity of the substrate toward the production of multicarbon species with higher selectivity. The CuNPs@rGO-NB nanocomposite was optimized for rGO, NB, and Cu nanoparticle compositions as well as the applied potential for the highest CO₂ electroreduction faradaic efficiency. The modified electrocatalyst was able to reduce CO₂ to value-added products (ethanol, acetic acid, formic acid, CO, and methane) with a total faradaic efficiency of about 86%. The evaluation of gas and liquid products was carried out by gas analyzer–gas chromatography, chemical oxygen demand, and gas chromatography–mass spectrometry techniques. The best results were observed at the potential of −1.0 V vs. Ag/AgCl, rGO amount of 0.5 mg mL⁻¹, NB and a copper concentration of 15 and 10 mM, respectively. The outstanding electroactivity of the nanocomposite could be promising in terms of electroconversion of CO₂ to useful products and facing environmental challenges.

使用由铜纳米颗粒（CuNPs @ rGO-NB）装饰的尼罗蓝（NB）功能化的还原氧化石墨烯（rGO）（rGO-NB）制备了改性的碳纳米复合材料。这种独特的基于氧化石墨烯的电催化剂浇铸在铜板电极上，可通过电化学还原将CO ₂有效转化为有价值的产品，以节省能源。代表的电催化剂的应用提高了底物对具有更高选择性的多碳物质生产的电活性。CuNPs @ rGO-NB纳米复合材料针对rGO，NB和Cu纳米颗粒的组成进行了优化，并为最高的CO ₂电还原法拉第效率提供了应用潜力。改性电催化剂能够还原CO ₂增值产品（乙醇，乙酸，甲酸，CO和甲烷）的总法拉第效率约为86％。气体和液体产品的评估是通过气体分析仪–气相色谱法，化学需氧量和气相色谱–质谱法进行的。在相对于Ag / AgCl的-1.0 V电位，rGO量为0.5 mg mL ^-1，NB和铜浓度分别为15和10 mM的条件下观察到最佳结果。就将CO ₂电转化为有用的产品并面临环境挑战而言，纳米复合材料出色的电活性可能很有希望。