Pt Dopant: Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media

被引:87
作者
Choi, Songa [1 ,2 ]
Park, Jongsik [1 ,2 ]
Kabiraz, Mrinal Kanti [3 ,4 ]
Hong, Youngmin [3 ,4 ]
Kwon, Taehyun [1 ,2 ]
Kim, Taekyung [1 ,2 ]
Oh, Aram [5 ]
Baik, Hionsuck [5 ]
Lee, Minseop [3 ,4 ]
Paek, Seung-Min [3 ,4 ]
Choi, Sang-Il [3 ,4 ]
Lee, Kwangyeol [1 ,2 ]
机构
[1] Korea Univ, Dept Chem, Seoul 02841, South Korea
[2] Korea Univ, Res Inst Nat Sci, Seoul 02841, South Korea
[3] Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea
[4] Kyungpook Natl Univ, Green Nano Mat Res Ctr, Daegu 41566, South Korea
[5] KBSI, Seoul 02841, South Korea
基金
新加坡国家研究基金会;
关键词
doping; electrocatalysts; iridium oxides; oxidation states; oxygen evolution reaction; X-RAY-ABSORPTION; ELECTRONIC-STRUCTURE; WATER OXIDATION; IRIDIUM; CATALYSTS; DISSOLUTION; METALS; SPECTROSCOPY; PERFORMANCE; STABILITY;
D O I
10.1002/adfm.202003935
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Dissolution of Ir oxides in Ir-based catalysts, which is closely linked to the catalyst activity and stability toward the oxygen evolution reaction (OER) in acidic media, is a critical unresolved problem in the commercialization of water electrolysis. Doping foreign elements into the Ir oxides can accomplish an optimal combination of Ir oxidation states that is conducive to the leaching-resistance of active catalytic sites. Here, it is reported that Pt doping into IrOx-based nanoframe is beneficial in both terms of activity and stability. The Pt-doped IrOx-based nanoframe achieves the mass activity of 0.644 A mg(Ir+Pt)(-1)at 1.53V(RHE), which is 15-fold higher than that of the commercial IrO2. During the accelerated durability test, the Ir-IV-to-Ir(III)ratio of 5 is maintained in the presence of Pt dopant to effectively mitigate the degradation of Ir catalyst, leading to the superb catalyst durability in acidic media.
引用
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页数:10
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