基于限阈空间制备Mn单原子催化剂及其电催化析氧性能

Mn single‑atom catalysts based on confined space:Fabrication and the electrocatalytic oxygen evolution reaction performance

采用一种简单的策略,以未去除模板剂的原粉介孔二氧化硅KIT-6(TOK)为载体,利用模板剂和二氧化硅壁之间的限阈空间来制备单原子催化剂(SACs)。通过固相研磨将含Mn前驱体引入TOK的固有限阈空间后,Mn SACs可在热处理过程中迅速生成。密度泛函理论计算和实验数据表明,Mn原子被载体上的Si—OH基团所锚定,并以Mn—O—Si的形式存在。将得到的Mn SACs应用于电催化析氧反应,实验结果显示,与在没有限阈空间载体中合成的对比样品相比,Mn SACs表现出更出色的催化性能。

A simple strategy was adopted to prepare single-atom catalysts(SACs)using mesoporous silica KIT-6(TOK)without templating agent removal as a carrier and utilizing the confined space between the templating agent and the silica wall.After the Mn-containing precursor was introduced into the confined space of TOK by solid-phase milling,Mn SACs can be rapidly generated during the calcination.Density functional theory calculations and experi-mental data indicate that the Mn atoms are anchored by Si—OH groups on the carriers and exist as Mn—O—Si.The obtained Mn SACs were applied to the electrocatalytic oxygen evolution reaction,and the experimental results show that the Mn SACs exhibit better catalytic performance than the comparison samples synthesized in a carrier without confined space.