Ternary PdNiO nanocrystals-ornamented porous CeO2/onion-like carbon for electrooxidation of carbon monoxide: unveiling the effect of supports and electrolytes

Adewale K. Ipadeola; Aderemi B. Haruna; Aboubakr M. Abdullah

摘要

Porous ternary Pd-based catalysts are highly promising for various electrocatalytic applications, due to their low Pd mass, high surface area, accessible active sites, and tunable electronic structure; however, their activity for CO oxidation (CO_(oxid)) in different electrolytes is yet to be reported. Herein, ternary PdNiO nanocrystals supported on porous CeO2/onion-like carbon nanostructures (PdNiO-CeO2/OLC) were prepared by the sol-gel and impregnation approaches for electrochemical CO_(oxid) in different electrolytes at room temperature. Notably, porous CeO2/OLC acts as a support and nanoreactor for supporting the growth of PdNiO without the need for reducing agents or surfactants. The as-obtained PdNiO-CeO2/OLC had a porous sponge-like structure composed of ultra-small PdNiO nanocrystals (8 ± 1 nm) distributed on porous flower-like CeO2 and OLC, which possessed unique merits of multifunctional structure, clean surface, low mass of Pd (10 wt%), porosity (0.30 cm~3 g~(-1)), and high surface area (155.66 m2 g~(-1)). The CO_(oxid) activity of PdNiO-CeO2/OLC was higher than those of PdNiO/OLC, PdNiO-CeO2, and commercial Pd/C catalyst, owing to the electronic interaction of PdNiO with CeO2/OLC support, which eases CO adsorption/activation alongside activation/dissociation of H2O to generate active oxygenated species (i.e., OH) needed for accelerating CO_(oxid) kinetics. The CO_(oxid) activity of PdNiO-CeO2/OLC in acidic electrolyte (HClO4) was better than those in alkaline (KOH) and neutral (NaHCO3) electrolytes. This study may open new doorways for understanding the effect of electrolytes and supports on the CO_(oxid)d activity of porous ternary Pd-based catalysts.

机译：多孔三元Pd-based催化剂是高度承诺为各种electrocatalytic应用程序中,由于其低Pd质量,高表面积,活跃的网站,和可调电子结构;活动对CO氧化(CO_(氧化物))不同电解质尚未报道。在此,三元PdNiO纳米晶体支持多孔CeO2 /剥离出碳纳米结构(PdNiO-CeO2 /共同体)被溶胶-凝胶法和准备电化学浸渍方法CO_(氧化物)在不同电解质在房间温度。支持和nanoreactor支持增长减少代理或PdNiO的不需要表面活性剂。多孔海绵状结构组成的超薄PdNiO纳米晶体(8±1海里)分布在多孔如花似玉CeO2共同体,它拥有多功能的独特优点吗结构、表面清洁,低质量的Pd (10wt %)、孔隙度(0.30厘米~ 3 g ~(1)),和高面积(155.66平方米g ~(1))。活动PdNiO-CeO2 /共同体是高于PdNiO /共同体、PdNiO-CeO2和商业Pd / C催化剂,由于电子的相互作用PdNiO CeO2 /共同体支持,缓解有限公司吸附/激活与激活/ H2O离解生成活动含氧物种(例如,哦)所需加速CO_(氧化物)动力学。活动PdNiO-CeO2 /共同体在酸性电解液(高氯酸)比在碱性(KOH)和中性电解质(NaHCO3)。打开新门口对理解的影响电解质和支持CO_(氧化物)d多孔三元Pd-based催化剂的活性。

Ternary PdNiO nanocrystals-ornamented porous CeO2/onion-like carbon for electrooxidation of carbon monoxide: unveiling the effect of supports and electrolytes

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