For the large-scale commercialization of direct methanol fuel cells, developing Pt-alternative anode electrocatalysts with low cost and high activity plays an important role. In this work, a one-pot hydrothermal method has been developed for the direct synthesis of the Rh nanosheets (Rh-NSs) on reduced graphene oxide (RGO). The newly prepared Rh-NSs/RGO hybrids have great electrocatalytic activity for the methanol oxidation reaction (MOR) in alkaline media, much better than single-component Rh nanoparticles (Rh-NPs) and Rh nanoparticles/RGO (Rh-NPs/RGO) hybrids, originating from the two-dimensional structure of Rh nanosheets and excellent physical/chemical property of the RGO. Very importantly, cyclic voltammetry (CV) measurements show the onset oxidation potential of the MOR at the Rh-NSs/RGO hybrids negatively shift ca. 120 mV compared to the commercial Pt/C electrocatalyst. Meanwhile, CV measurements show that the MOR current at the Rh-NSs/RGO hybrids is 3.6 times bigger than that at the commercial Pt/C electrocatalyst at 0.61 V potential. Additionally, chronoamperometry measurement shows the Rh-NSs/RGO hybrids have excellent stability for the MOR. These electrochemical data demonstrate that the Rh-NSs/RGO hybrids are a highly promising Pt-alternative anode electrocatalyst for the MOR in alkaline media.

中文翻译：

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铑纳米片减少的氧化石墨烯杂化物：碱性介质中甲醇氧化反应的高活性铂替代电催化剂

为了直接甲醇燃料电池的大规模商业化，开发低成本和高活性的Pt替代阳极电催化剂起着重要的作用。在这项工作中，开发了一种一锅法水热方法，用于在还原氧化石墨烯（RGO）上直接合成Rh纳米片（Rh-NSs）。新制备的Rh-NSs / RGO杂化物对碱性介质中的甲醇氧化反应（MOR）具有良好的电催化活性，远优于单组分Rh纳米颗粒（Rh-NPs）和Rh纳米颗粒/ RGO（Rh-NPs / RGO）杂化物，源自Rh纳米片的二维结构和RGO的优异物理/化学性质。非常重要的是，循环伏安法（CV）的测量表明MOR在Rh-NSs / RGO杂种上的起始氧化电势负向移动约ca。与商用Pt / C电催化剂相比为120 mV。同时，CV测量显示，Rh-NSs / RGO杂化体的MOR电流是商用Pt / C电催化剂在0.61 V电位下的MOR电流的3.6倍。此外，计时电流法测量显示，Rh-NSs / RGO杂化物对MOR具有出色的稳定性。这些电化学数据表明，Rh-NSs / RGO杂化物是在碱性介质中用于MOR的极有希望的Pt替代阳极电催化剂。