铱
电解质
电解
膜
材料科学
硒
聚合物
化学工程
电解水
电化学
壳体(结构)
化学
无机化学
冶金
复合材料
电极
有机化学
生物化学
物理化学
工程类
催化作用
作者
Myeong‐Geun Kim,Hyun Ju Lee,Tae Kyung Lee,Gibaek Lee,Haneul Jin,Jaehyun Park,Se Youn Cho,Sungho Lee,Hyung Chul Ham,Sung Jong Yoo
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-05-22
卷期号:9 (6): 2876-2884
标识
DOI:10.1021/acsenergylett.4c00884
摘要
Low-Ir electrocatalysts are crucial for developing large-scale polymer-electrolyte-membrane water electrolysis (PEMWE) facilities, which are necessary to advance the hydrogen economy. However, the performance and durability of low-Ir electrocatalysts are unsatisfactory. To address this issue, we prepared selenium-modified Ir nanoparticles on high-crystalline-carbon (HCC) supports. The introduction of HCC supports effectively reduced Ir usage, and Se incorporation mitigated Ir degradation. Se nucleophiles suppressed the electrochemical oxidation of Ir, leading to the formation of a unique nanostructure featuring an ultrathin IrOxHySez shell and a crystalline Ir core. Theoretical calculations indicated that the electronic structure of Ir and its binding affinity with *O were modified, thereby enhancing the catalytic activities. Ir-IrOxHySez/HCC exhibited outstanding PEMWE performances (Ir-mass specific power of 23.69 kW·gIr–1; durability for 370 h) with a small amount of Ir (0.05 mg·cm–2). Thus, employing a carbon support and nucleophile-induced nanostructures can serve as a strategy to ensure long-term PEMWE performance while reducing Ir usage.
科研通智能强力驱动
Strongly Powered by AbleSci AI