Selective electroreduction of CO2 into CO over Ag and Cu decorated carbon nanoflakes†

IF 3.2 Q2 CHEMISTRY, PHYSICAL Energy advances Pub Date : 2024-08-06 DOI:10.1039/D4YA00462K
Ahmad Faraz, Waheed Iqbal, Shayan Gul, Fehmida K. Kanodarwala, Muhammad Nadeem Zafar, Guobao Xu and Muhammad Arif Nadeem
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Abstract

The electrocatalytic CO2 reduction reaction (eCO2RR) has the potential to effectively cut carbon emission. However, the activity and selectivity of eCO2RR catalysts are topical due to the intricacy of the reaction components and mechanism. Herein, we have decorated silver and copper nanoparticles over carbon nanoflakes to achieve an Ag–Cu NPs/C system that enables selective reduction of CO2 into CO. The catalyst is prepared by incorporating Ag nanoparticles into a Cu-BTC MOF (HKUST-1) and subsequent carbonization that alters the surface composition, with improved activity and faradaic efficiency (FE) towards selective CO2 reduction. The evaluation of electrocatalytic performance reveals that the synthesized catalyst exhibits enhanced electrocatalytic activity and selectivity with a FECO of ∼ 90% at −0.79 VRHE and a current density (j) of 44.15 mA cm−2 compared to Ag-NPs and Cu/C. The durability test over 40 h confirms the outstanding stability of Ag–Cu NPs/C. The lower Tafel slope value of only 75 mV dec−1 corresponds to the fast reaction kinetics on the surface of Ag–Cu NPs/C. The synthetic protocol in this work offers an easy approach to the betterment of a cost-effective electrocatalyst with improved FE.

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在银和铜装饰的纳米碳片上选择性地将 CO2 电还原成 CO
电催化二氧化碳还原反应(eCO2RR)具有有效减少碳排放的潜力。然而,由于反应组分和机理的复杂性,eCO2RR 催化剂的活性和选择性一直是个难题。在此,我们将银纳米颗粒和铜纳米颗粒装饰在纳米碳片上,得到了一种银-铜 NPs/C 系统,该系统可将 CO2 选择性地还原成 CO。该催化剂的制备方法是将银纳米颗粒加入铜-四氯化碳 MOF(HKUST-1),然后进行碳化,从而改变其表面成分,从而提高了选择性还原 CO2 的活性和法拉第效率(FE)。电催化性能评估结果表明,与 Ag-NPs 和 Cu/C 相比,合成催化剂的电催化活性和选择性均有所提高,在 -0.79 VRHE 条件下的 FECO 为 90%,电流密度 (j) 为 44.15 mA cm-2。超过 40 小时的耐久性测试证实了 Ag-Cu NPs/C 的出色稳定性。仅为 75 mV dec-1 的较低 Tafel 斜坡值与 Ag-Cu NPs/C 表面的快速反应动力学相吻合。这项工作中的合成方案提供了一种简便的方法,可以更好地改进具有成本效益的电催化剂,并提高其 FE。
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Correction: Steady states and kinetic modelling of the acid-catalysed ethanolysis of glucose, cellulose, and corn cob to ethyl levulinate. Back cover Fabrication methods, pseudocapacitance characteristics, and integration of conjugated conducting polymers in electrochemical energy storage devices Inside back cover Back cover
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