Composition control of alloy nanoparticles consisting of bulk-immiscible Au and Rh metals via an ionic liquid/metal sputtering technique for improving their electrocatalytic activity
Composition control of alloy nanoparticles consisting of bulk-immiscible Au and Rh metals via an ionic liquid/metal sputtering technique for improving their electrocatalytic activity
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DOI：
10.1039/d2cp01461k
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发表时间：
2022-09-30
影响因子：
3.3
通讯作者：
Torimoto，Tsukasa
中科院分区：
文献类型：
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作者：
Akiyoshi，Kazutaka;Watanabe，Yumezo;Torimoto，Tsukasa
以N，N-二乙基-N-甲基-N-（2-甲氧基乙基）四氟硼酸铵（DEME-BF 4）为室温离子液体（RTIL），通过同时溅射Au和Rh的方法制备了AuRh纳米合金。在RTIL中形成尺寸为1- 2nm的双金属AuRh合金NP。通过改变溅射靶Au和Rh板的表面积，可以控制合金成分。将由此获得的AuRh NPs负载在炭黑（CB）粉末上使AuRh NPs的尺寸增加至约100 μ m。2-8 nm，取决于Au/Rh比率。AuRh纳米粒子负载CB催化剂的氧还原电催化活性与其组成呈火山型关系，其中Au表面覆盖率为62%的AuRh纳米粒子具有最佳的氧还原活性，比活性约为1000。比纯Rh NPs高5倍。
AuRh bimetallic alloy nanoparticles (NPs) were successfully prepared by simultaneous sputtering of Au and Rh in a room-temperature ionic liquid (RTIL) of N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate (DEME-BF4). Bimetallic AuRh alloy NPs of 1–2 nm in size were formed in the RTIL. The alloy composition was controllable by changing the surface areas of Au and Rh plates used as sputtering targets. Loading thus-obtained AuRh NPs on carbon black (CB) powders increased the size of AuRh NPs to ca. 2–8 nm, depending on the Au/Rh ratio. The electrocatalytic activity for oxygen reduction reaction (ORR) of AuRh NP-loaded CB catalysts showed a volcano-type dependence on their composition, in which AuRh NPs with Au surface coverage of 62% exhibited the optimal ORR activity, the specific activity being ca. 5 times higher than that of pure Rh NPs.