材料科学
石墨烯
电化学
催化作用
吸附
纳米颗粒
可逆氢电极
格式化
氢
氧化还原
化学气相沉积
分析化学(期刊)
法拉第效率
电极
铜
纳米技术
物理化学
工作电极
化学
冶金
生物化学
有机化学
色谱法
作者
Zhipeng Ma,Constantine Tsounis,Priyank V. Kumar,Zhaojun Han,Roong Jien Wong,Cui Ying Toe,Yingtang Zhou,Nicholas M. Bedford,Lars Thomsen,Yun Hau Ng,Rose Amal
标识
DOI:10.1002/adfm.201910118
摘要
Abstract Defective 3D vertical graphene (VG) with a relatively large surface area, high defect density, and increased surface electrons is synthesized via a scalable plasma enhanced chemical vapor deposition method, together with a postsynthesis Ar‐plasma treatment (VG‐Ar). Subsequently, Cu@Cu x O nanoparticles are deposited onto VG‐Ar (Cu/VG‐Ar) through a galvanostatic pulsed electrodeposition method. These Cu@Cu x O nanocatalyst systems exhibit a superior electrochemical CO 2 reduction performance when compared to Cu‐based catalysts supported on commercial graphene paper or pristine VG without postsynthesis Ar‐plasma treatment. The Cu/VG‐Ar achieves the highest CO 2 reduction Faradaic efficiency of 60.6% (83.5% of which are attributed to liquid products, i.e., formate, ethanol, and n‐propanol) with a 5.6 mA cm −2 partial current density at −1.2 V versus reversible hydrogen electrode (RHE). The improved CO 2 reduction performance of Cu/VG‐Ar originates from the well‐dispersed Cu@Cu x O nanoparticles deposited on the defective VG‐Ar. The intrinsic carbon defects on VG‐Ar can suppress the hydrogen evolution reaction as well as tune the interaction between VG and Cu@Cu x O, thus impeding the excessive oxidation of Cu 2 O species deposited on VG‐Ar. The defective VG‐Ar and stabilized Cu@Cu x O enhances CO 2 adsorption and promotes electron transfer to the adsorbed CO 2 and intermediates on the catalyst surface, thus improving the overall CO 2 reduction performance.
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