Journal
CHEMSUSCHEM
Volume 14, Issue 9, Pages 2112-2125Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100200
Keywords
Defects; electrocatalysis; hydrogen evolution; interface; nanostructures
Funding
- Department of Atomic Energy (DAE), India Funding Source: Medline
- NISER Funding Source: Medline
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The synthesis of PdO-RuO2-C resulted in a catalyst with abundant interfaces/defects, showing high HER and HOR activity in alkaline conditions. It exhibited excellent stability and outperformed Pt/C in alkaline HOR activity. Improvement of HER/HOR kinetics was observed in different alkaline electrolytes.
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-RuO2-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-RuO2/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-RuO2/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+
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