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IrO2 modified Crystalline-PdO nanowires based bi-functional electro-catalyst for HOR/HER in acid and base

Author

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  • Samanta, Rajib
  • Mishra, Ranjit
  • Manna, Biplab Kumar
  • Barman, Sudip

Abstract

Development of active HOR/HER electro-catalyst is crucial for development of next-generation PEM-and-AEM based renewable technologies. Here, IrO2-modified PdO-nanostructures/carbon-composite with plenty of surface defects was synthesized for HER/HOR applications. The ECSA of IrO2–PdO/C is found to be 449 m g−1 which is ∼9-fold higher than Pt/C in acid. The HER of IrO2–PdO/C are 1.15-and 2.35-fold higher than Pt/C in acid and base. The stability test shows excellent stability of this catalyst. It also shows superior HOR activity. The i0,m of IrO2–PdO/C is ∼647 and 376 mA/mgmetal in acid and base that are 1.78-and 3.63-times higher in compared to commercial Pt/C. Small amount of IrO2 in IrO2–PdO/C enhances its HOR/HER activity ∼300 times as compared to PdO/C. The IrO2 or defects of the catalyst absorb OHad that reacts with neighboring Had at defect sites or interfaces leading to increase HER/HOR performance through bifunctional mechanism. We demonstrate volcano relationship between exchange current and H∗/OH∗ binding energy confirming that HBE and OHBE are equal descriptors for HOR/HER in base. The HOR/HER in different electrolyte and increasing Li+ ions suggests [(H2O)x-M+-OHad ] in double layer influences the HOR/HER in base. This work could lead to the development of Pt-free electrocatalysts for renewable energy technologies.

Suggested Citation

  • Samanta, Rajib & Mishra, Ranjit & Manna, Biplab Kumar & Barman, Sudip, 2022. "IrO2 modified Crystalline-PdO nanowires based bi-functional electro-catalyst for HOR/HER in acid and base," Renewable Energy, Elsevier, vol. 191(C), pages 151-160.
    • Handle: RePEc:eee:renene:v:191:y:2022:i:c:p:151-160
    DOI: 10.1016/j.renene.2022.04.028
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