Highly active and stable amorphous IrOx/CeO2 nanowires for acidic oxygen evolution

作者：Gou, Wangyan; Xia, Zhaoming; Tan, Xiaohe; Xue, Qingyu; Ye, Fan; Dai, Sheng; Zhang, Mingkai; Si, Rui; Zou, Yong; Ma, Yuanyuan^*; Ho, Johnny C.^*; Qu, Yongquan^*

来源：Nano Energy, 2022, 104: 107960.

DOI：10.1016/j.nanoen.2022.107960

• Acidic oxygen evolution
• Amorphous structure
• Iridium oxide
• Ceria
• Electron buffer

Development of highly active and durable electrocatalysts for acidic oxygen evolution reaction (OER) remains an unresolved grand challenge. Here, we reported the amorphous IrOx/CeO2 nanowires as highly active and acidstable OER catalysts through a facile electro-spinning/calcination approach. The amorphous catalysts delivered a high mass activity of 167 A(gIr)(-1) at 1.51 V, a low overpotential of 220 mV at 10 mA cm(-2), and a stable performance for 300 h of continuous operation in acid. As revealed by complementary experimental and theoretical calculation results, the intimate nanoscale feature of IrOx/CeO2 creates abundant binary interfaces, at which CeO2 as an electron buffer regulates the adsorption of oxygen intermediates, lowers the activation barrier of OER, and suppresses the over-oxidation and dissolution of Ir, thereby significantly enhancing the OER activity and stability. This work provides a new strategy for designing highly active and acid-resistant OER catalysts.

• 单位
  清华大学; 华东理工大学; 西安交通大学; 西北工业大学