In this study, a simple and environmentally amicable synthesis procedure for support-free silver–rhodium (Ag–Rh) bimetallic network-like nanoalloy was used to catalyze an oxygen reduction reaction in an alkaline medium. The support-free network-like morphology of Ag–Rh nanoalloy exhibits a higher electrochemical surface area (ECSA) of 65.6 m2/g than carbon (VC) supported Ag–Rh (23.8 m2/g). In comparison to the reported benchmark Ag-based electrocatalysts, it presents an improved mass and specific activity of 971.1 mA/mg and 1.45 mA/cm2, respectively. Based on the durability test, the support-free Ag–Rh catalyst retains ∼70% of its initial ECSA after 7000 potential cycles, and Ag–Rh/VC possesses only 20% after 5000 potential cycles due to the surface oxidation of carbon support. Hence, the superior electrocatalytic performance attributed to the support-free morphology and alloy formation with Rh was clearly demonstrated, which could potentially be the choice of the cathodic electrocatalyst for alkaline fuel cells.

中文翻译：

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提高Ag-Rh网络状纳米合金作为碱性燃料电池中氧还原的无载体电催化剂的活性和稳定性

在这项研究中，一种简单且环境友好的无载体银铑（Ag-Rh）双金属网络状纳米合金的合成方法用于在碱性介质中催化氧还原反应。Ag-Rh 纳米合金的无支撑网络状形态表现出比碳 (VC) 支撑的 Ag-Rh (23.8 m2/g) 更高的电化学表面积 (ECSA)，为 65.6 m2/g。与报道的基准 Ag 基电催化剂相比，它的质量和比活性分别提高了 971.1 mA/mg 和 1.45 mA/cm2。根据耐久性测试，无载体的 Ag-Rh 催化剂在 7000 次电位循环后保留其初始 ECSA 的约 70%，而由于碳载体的表面氧化，Ag-Rh/VC 在 5000 次电位循环后仅保留 20%。因此，