文献类型：期刊文献

英文题名：Lanthanides Regulated the Amorphization-Crystallization of IrO2 for Outstanding OER Performance

作者：Ma, Chenglong[1];Sun, Wei[2];Zaman, Waqas Qamar[3];Zhou, Zhenhua[1];Zhang, Hao[1];Shen, Qicheng[1];Cao, Limei[1];Yang, Ji[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Hainan Univ, Coll Ecol & Environm, Haikou 570228, Hainan, Peoples R China;[3]Natl Univ Sci & Technol NUST, Inst Environm Sci & Engn, Sch Civil & Environm Engn, Islamabad 44000, Pakistan

年份：2020

卷号：12

期号：31

起止页码：34980

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20203709163476);WOS:【SCI-EXPANDED(收录号:WOS:000558792700048)】；

基金：This work is supported by the National Natural Science Foundation of China (no. 51778229).

语种：英文

外文关键词：oxygen evolution reaction; electrocatalysis; iridium lanthanides composite; water splitting; crystalline-amorphous interface

摘要：Research has been focused on regulating the amorphous surface of Ir-based materials to achieve a higher oxygen evolution reaction (OER) activity. The IrOx amorphous layer is generally considered to be substantial enough to break the limitation created by the conventional adsorbate evolution mechanism (AEM) in acidic media. In this work, we used lanthanides to regulate IrOx amorphization-crystallization through inhibiting the crystallization of iridium atoms in the calcination process. The chosen route created abundant crystalline-amorphous (c-a) interfaces, which greatly enhanced the charge transfer kinetics and the stability of the materials. The mass activity of iridium in the synthesized IrO2@LuIr1-nOx(OH)(y) structure reached 128.3 A/g(Ir), which is 14.6-fold that of the benchmark IrO2. All the IrO2@LnIr(1-n)O(x)(OH)(y) (Ln = La-Lu) structures reflected 290-300 mV of overpotential at 10 mA/cm(geo)(2). We demonstrate that a highly active c-a interface possesses an efficient charge transfer capability and is conducive to the stability of the activated oxygen species. The surface-activated oxygen species and the tensile strain [IrO6] octahedron regulated by lanthanides are synergistically beneficial for increasing the intrinsic OER activity. Our research findings introduce c-a interface generation by the regulation of lanthanides as a new method for the rational design of robust OER catalysts.