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Improved activity and stability of Ag–Rh network-like nanoalloy as support-free electrocatalyst for oxygen reduction in alkaline fuel cells
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.
Improved activity and stability of Ag–Rh network-like nanoalloy as support-free electrocatalyst for oxygen reduction in alkaline fuel cells
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.
Improved activity and stability of Ag–Rh network-like nanoalloy as support-free electrocatalyst for oxygen reduction in alkaline fuel cells
Bhuvanendran, Narayanamoorthy (author) / Balaji, Subramanian (author) / Zhang, Weiqi (author) / Xu, Qian (author) / Pasupathi, Sivakumar (author) / Su, Huaneng (author)
2020-07-01
9 pages
Article (Journal)
Electronic Resource
English
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