Promises of engineering Rh-based nanostructures for advanced electrocatalysis

Li, Le; Shang, Yangyang; Zhu, Qianyi; Han, Meijun; Tu, Xiaobin

doi:10.1016/j.ijhydene.2023.07.267

Cited by 5 publications

(1 citation statement)

References 152 publications

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“…Rhodium (Rh) is a chemically inert transition metal with excellent catalytic properties for various applications in electrocatalysis [5]. That also involves the application of Rhbased catalysts for electrochemical energy conversion reactions [6][7][8][9], including oxygen reduction [10,11].…”

Section: Introductionmentioning

confidence: 99%

Study of Oxygen Reduction Reaction on Polycrystalline Rhodium in Acidic and Alkaline Media

Golubović,

Varničić,

Štrbac

2024

Catalysts

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This study examines the kinetics and mechanism of the oxygen reduction reaction (ORR) on a polycrystalline rhodium electrode (Rh(poly)) in acidic and alkaline media, using rotating disc electrode measurements. This study found that the ORR activity of the Rh(poly) electrode decreases in the order of 0.1 M NaOH > 0.1 M HClO4 > 0.05 M H2SO4 concerning the half-wave potentials. The Tafel slopes for ORR on Rh(poly) in the cathodic direction are 60 and 120 mV dec−1 at low and high overpotentials, respectively, in perchloric acid and alkaline solutions. However, strongly adsorbed sulfate anions hinder the ORR on Rh(poly) in sulfuric acid, leading to higher Tafel slopes. The highest ORR activity of Rh(poly) in an alkaline media suggests the promoting role of the specifically adsorbed OH− anions and RhOH. In all cases, ORR on Rh(poly) proceeds through the 4e-series reaction pathway.

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