Topologically Close-Packed Frank-Kasper C15 Phase Intermetallic Ir Alloy Electrocatalysts Enables High-Performance Proton Exchange Membrane Water Electrolyzer
发布时间：2024-12-29
点击次数：
- 论文类型：
- Research Article
- 第一作者：
- Qin,Zhuhuang
- 通讯作者：
- Li,Qing
- 合写作者：
- Huang, Yunhui,Yan, Pengfei,Cao, Rui,Lu, Gang, Shenzhou,Xie, Linfeng,Mao, Jialun,Lai, Jiaoyang,Liu, Xuan,Sathishkumar, Nadaraj,Wu, Qiyan,Li,Jinhui
- 发表刊物：
- Advanced Materials
- 所属单位：
- 华中科技大学
- 刊物所在地：
- 美国
- 文献类型：
- Article
- 卷号：
- 36
- 期号：
- 47
- 页面范围：
- 2412541
- ISSN号：
- 1521-4095
- 关键字：
- electrocatalysis; Frank-Kasper C15 phases; hydrogen evolution reaction; intermetallics; proton exchange membrane water electrolyzer
- DOI码：
- 10.1002/adma.202412541
- 发表时间：
- 2024-09-30
- 影响因子：
- 27.4
- 摘要：
- Chemical synthesis of unconventional topologically close-packed intermetallic nanocrystals (NCs) remains a considerable challenge due to the limitation of large volume asymmetry between the components. Here, a series of unconventional intermetallic Frank-Kasper C15 phase Ir2M (M = rare earth metals La, Ce, Gd, Tb, Tm) NCs is successfully prepared via a molten-salt assisted reduction method as efficient electrocatalysts for hydrogen evolution reaction (HER). Compared to the disordered counterpart (A1-Ir2Ce), C15-Ir2Ce features higher Ir-Ce coordination number that leads to an electron-rich environment for Ir sites. The C15-Ir2Ce catalyst exhibits excellent and pH-universal HER activity and requires only 9, 16, and 27 mV overpotentials to attain 10 mA cm−2 in acidic, alkaline, and neutral electrolytes, respectively, representing one of the best HER electrocatalysts ever reported. In a proton exchange membrane water electrolyzer, the C15-Ir2Ce cathode achieves an industrial-scale current density of 1 A cm−2 with a remarkably low cell voltage of 1.7 V at 80 °C and can operate stably for 1000 h with a sluggish voltage decay rate of 50 µV h−1. Theoretical investigations reveal that the electron-rich Ir sites intensify the polarization of *H2O intermediate on C15-Ir2Ce, thus lowering the energy barrier of the water dissociation and facilitating the HER kinetics.