用铱掺杂剂激活惰性非贵金属钙钛矿以在酸性条件下实现高效析氧反应
Activating Inert, Nonprecious Perovskites with Iridium Dopants for Efficient Oxygen Evolution Reaction under Acidic Conditions.
作者信息
Liang Xiao, Shi Lei, Liu Yipu, Chen Hui, Si Rui, Yan Wensheng, Zhang Qi, Li Guo-Dong, Yang Li, Zou Xiaoxin
机构信息
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2019 Jun 3;58(23):7631-7635. doi: 10.1002/anie.201900796. Epub 2019 Mar 4.
Simultaneous realization of improved activity, enhanced stability, and reduced cost remains a desirable yet challenging goal in the search of oxygen evolution electrocatalysts in acid. Herein we report iridium-containing strontium titanates (Ir-STO) as active and stable, low-iridium perovskite electrocatalysts for the oxygen evolution reaction (OER) in acid. The Ir-STO contains 57 wt % less iridium relative to the benchmark catalyst IrO , but it exhibits more than 10 times higher catalytic activity for OER. It is shown to be among the most efficient iridium-based oxide electrocatalysts for OER in acid. Theoretical results reveal that the incorporation of iridium dopants in the STO matrix activates the intrinsically inert titanium sites, strengthening the surface oxygen adsorption on titanium sites and thereby giving nonprecious titanium catalytic sites that have activities close to or even better than iridium sites.
在寻找酸性析氧电催化剂的过程中，同时实现活性提高、稳定性增强和成本降低，仍然是一个理想但具有挑战性的目标。在此，我们报道了含铱钛酸锶（Ir-STO）作为用于酸性析氧反应（OER）的活性且稳定的低铱钙钛矿电催化剂。相对于基准催化剂IrO₂，Ir-STO的铱含量减少了57 wt%，但其对OER的催化活性高出10倍以上。它被证明是酸性条件下用于OER的最有效的铱基氧化物电催化剂之一。理论结果表明，在STO基体中掺入铱掺杂剂可激活本征惰性的钛位点，增强钛位点上的表面氧吸附，从而赋予非贵金属钛催化位点，其活性接近甚至优于铱位点。
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