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Interface‐ and Surface‐Engineered PdO−RuO 2 Hetero‐Nanostructures with High Activity for Hydrogen Evolution/Oxidation Reactions
Author(s) -
Samanta Rajib,
Mishra Ranjit,
Barman Sudip
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100200
Subject(s) - tafel equation , catalysis , chemistry , base (topology) , kinetics , exchange current density , hydrogen , electrolyte , chemical engineering , inorganic chemistry , nanotechnology , materials science , electrochemistry , electrode , organic chemistry , mathematical analysis , physics , mathematics , quantum mechanics , engineering
Active catalysts for HER/HOR are crucial to develop hydrogen‐based renewable technologies. The interface of hetero‐nanostructures can integrate different components into a single synergistic hybrid with high activity. Here, the synthesis of PdO−RuO 2 −C with abundant interfaces/defects was achieved for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR). It exhibited a current density of 10 mA cm −2 at 44 mV with a Tafel slope of 34 mV dec −1 in 1 m KOH. The HER mass activity was 3 times higher in base and comparable to Pt/C in acid. The stability test confirmed high HER stability. The catalyst also exhibited excellent HOR activity in both media; in alkaline HOR it outperformed Pt/C. The exchange current density i 0,m of PdO−RuO 2 /C was 522 mA mg −1 in base, which is 58 and 3.4 times higher than those of Pd/C and Pt/C. The HOR activity of PdO−RuO 2 /C was 22 and 300 times higher than those of PdO/C in acid and base. Improvement of HER/HOR kinetics in different alkaline electrolytes was observed in the order K +