Confined Ir single sites with triggered lattice oxygen redox: Toward boosted and sustained water oxidation catalysis
Confined Ir single sites with triggered lattice oxygen redox: Toward boosted and sustained water oxidation catalysis
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DOI：
10.1016/j.joule.2021.05.018
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发表时间：
2021-08-18
期刊：
影响因子：
39.8
通讯作者：
Ge, Junjie
中科院分区：
文献类型：
--
作者：
Shi, Zhaoping;Wang, Ying;Ge, Junjie
高效的酸析氧反应电催化剂是开发清洁能源的关键。晶格氧介导机制（LOM）通过触发晶格氧氧化还原来提高OER动力学。然而，由于OER期间的本体结构重建，促进的固有活性受到低稳定性的损害。在这里，我们证明了一个单一的网站Ir掺杂策略可以有效地解决这一挑战。由于仔细定义的螯合环境的Ir，增加Ir-O共价和从事晶格氧氧化已被观察到。更重要的是，局部触发的LOM在OER期间不引入结构演化。结果表明，Ir-MnO_2催化剂的质量活性是商品IrO_2催化剂的42倍以上，稳定性超过650 h，过电位仅增加15 mV。我们的工作开辟了一个可行的战略，以提高OER活动和稳定性同时进行。
Efficient electrocatalysts for oxygen evolution reaction (OER) in acid are critical to the development of clean energy conversion schemes. Lattice-oxygen-mediated mechanism (LOM) has been developed to boost OER kinetic via triggering lattice oxygen redox. However, the promoted intrinsic activity is compromised by low stability due to bulk structure reconstruction during OER. Here, we demonstrate that a single-site Ir-doping strategy can effectively address this challenge. Attributing to the carefully defined chelation environment of Ir, increased Ir-O covalency and engaged lattice oxygen oxidation have been observed. More importantly, locally triggered LOM introduces no structure evolution during OER. As a result, the constructed catalyst (Ir-MnO2) exhibited over 42 timesmoremass activity than that of commercial IrO2 as well as over 650 h stability with only a 15mV increase in overpotential. Our work opens up a feasible strategy to boost OER activity and stability simultaneously.