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

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IrO2 modified Crystalline-PdO nanowires based bi-functional electro-catalyst for HOR/HER in acid and base
Renewable Energy ( IF 9.0 ) Pub Date : 2022-04-13 , DOI: 10.1016/j.renene.2022.04.028
Rajib Samanta _{1,

2} , Ranjit Mishra _{1,

2} , Biplab Kumar Manna _{1,

2} , Sudip Barman _{1,

2}

Affiliation

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.

中文翻译：

IrO2改性结晶PdO纳米线基双功能电催化剂，用于酸碱中HOR/HER

活性 HOR/HER 电催化剂的开发对于开发下一代基于 PEM 和 AEM 的可再生技术至关重要。在这里，合成了具有大量表面缺陷的 IrO2 修饰的 PdO 纳米结构/碳复合材料，用于 HER/HOR 应用。发现 IrO 的 ECSA 2-PdO/C 为 449 m g-1，比酸中的 Pt/C 高 ∼9 倍。IrO2-PdO/C 的 HER 在酸和碱中分别比 Pt/C 高 1.15 倍和 2.35 倍。稳定性试验表明该催化剂具有优异的稳定性。它还显示出卓越的 HOR 活性。IrO2-PdO/C 的 i0，m 在酸和碱中的体积分别为 ∼647 和 376 mA/mgmetal，分别是商业 Pt/C 的 1.78 倍和 3.63 倍。与 PdO/C 相比，IrO2-PdO/C 中少量的 IrO2 将其 HOR/HER 活性提高了 ∼300 倍。催化剂的 IrO2 或缺陷吸收了与缺陷位点或界面处相邻 Had 反应的 OHad，从而通过双功能机制提高 HER/HOR 性能。我们证明了交换电流与 H∗/OH∗ 结合能之间的火山关系，证实 HBE 和 OHBE 是碱中 HOR/HER 的相等描述符。不同电解质中的 HOR/HER 和增加的 Li+ 离子表明双电层中的 [（H2O）x-M+-OHad ] 会影响碱中的 HOR/HER。这项工作可能导致用于可再生能源技术的无 Pt 电催化剂的开发。

更新日期：2022-04-13

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