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谷物边界对表面的局部化学环境进行了定制,用于性电催化的进化

Liqiang Hou¹, Zijian Li², Haeseong Jang³

¹College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.

Angewandte Chemie (International ed. in English)

|December 27, 2023

概括

催化剂中的颗粒边界创造了一个独特的局部环境,通过促进水分离和溢出来增强性进化反应 (HER).

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

已知粒度边界 (GBs) 通过增加活性位点或修改结合能量来影响催化活性.
然而,GBs对催化剂表面局部化学环境的具体影响仍然不清楚.

研究的目的:

为了研究谷物边界对催化剂局部化学环境的影响.
阐明GBs增强性进化反应 (HER) 的机制.

主要方法:

合成谷物边界丰富的 (GB-Ir) 催化剂.
运行拉曼光谱,分析当地的化学环境.
密度函数理论 (DFT) 计算以了解反应机制.

主要成果:

GBs产生了电子丰富的表面,导致局部类似酸的环境,其中含有离子 (H3O+) 的中间体.
H3O+中间体降低了水解离能障碍,促进了溢出.
GB-Ir 催化剂对性 HER (10 mV @ 10 mA cm−2, 20 mV dec−1) 显示出高活性.

结论:

谷物边界在调整催化剂的局部化学环境方面发挥着至关重要的作用.
当地的酸性状况和溢出的协同效应显著增强了性HER活性.
这些发现为GB增强的电催化和表面科学提供了新的见解.

关键词:

性 HER 是一个性的 HER.谷物边界谷物边界 H3O+ 中介物的表面是的表面.当地化学环境当地化学环境

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