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Pt Dopant: Controlling the Ir Oxidation States toward Efficient and Durable Oxygen Evolution Reaction in Acidic Media
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-21 , DOI: 10.1002/adfm.202003935 Songa Choi 1 , Jongsik Park 1 , Mrinal Kanti Kabiraz 2 , Youngmin Hong 2 , Taehyun Kwon 1 , Taekyung Kim 1 , Aram Oh 3 , Hionsuck Baik 3 , Minseop Lee 2 , Seung‐Min Paek 2 , Sang‐Il Choi 2 , Kwangyeol Lee 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-21 , DOI: 10.1002/adfm.202003935 Songa Choi 1 , Jongsik Park 1 , Mrinal Kanti Kabiraz 2 , Youngmin Hong 2 , Taehyun Kwon 1 , Taekyung Kim 1 , Aram Oh 3 , Hionsuck Baik 3 , Minseop Lee 2 , Seung‐Min Paek 2 , Sang‐Il Choi 2 , Kwangyeol Lee 1
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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−1Ir+Pt at 1.53 VRHE, which is 15‐fold higher than that of the commercial IrO2. During the accelerated durability test, the IrIV‐to‐IrIII 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.
中文翻译：
铂掺杂剂：控制Ir氧化态在酸性介质中向高效持久的氧释放反应的方向
Ir催化剂中Ir氧化物的溶解与催化剂的活性以及在酸性介质中对氧释放反应（OER）的稳定性密切相关，是水电解商业化中一个尚未解决的关键问题。将异质元素掺杂到Ir氧化物中可以实现Ir氧化态的最佳组合，这有利于活性催化位点的耐浸出性。在这里，据报道，Pt掺杂到基于IrO x的纳米框架中在活性和稳定性方面都是有益的。基于Pt掺杂的IrO x的纳米框架在1.53 V RHE时可实现0.644 A mg -1 Ir + Pt的质量活性，这是商用IrO 2的15倍。在加速耐久性测试过程中，在Pt掺杂剂的存在下，Ir IV与Irr III的比率保持为5，以有效减轻Ir催化剂的降解，从而在酸性介质中实现极好的催化剂耐久性。
更新日期：2020-09-18
中文翻译：
铂掺杂剂：控制Ir氧化态在酸性介质中向高效持久的氧释放反应的方向
Ir催化剂中Ir氧化物的溶解与催化剂的活性以及在酸性介质中对氧释放反应（OER）的稳定性密切相关，是水电解商业化中一个尚未解决的关键问题。将异质元素掺杂到Ir氧化物中可以实现Ir氧化态的最佳组合，这有利于活性催化位点的耐浸出性。在这里，据报道，Pt掺杂到基于IrO x的纳米框架中在活性和稳定性方面都是有益的。基于Pt掺杂的IrO x的纳米框架在1.53 V RHE时可实现0.644 A mg -1 Ir + Pt的质量活性，这是商用IrO 2的15倍。在加速耐久性测试过程中，在Pt掺杂剂的存在下，Ir IV与Irr III的比率保持为5，以有效减轻Ir催化剂的降解，从而在酸性介质中实现极好的催化剂耐久性。
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