A simple and scalable route to synthesis CoxCu1-xCo2O4@CoyCu1-yCo2O4 yolk-shell microspheres, high performance catalyst of hydrolyze ammonia borane for hydrogen production
A simple and scalable route to synthesis CoxCu1-xCo2O4@CoyCu1-yCo2O4 yolk-shell microspheres, high performance catalyst of hydrolyze ammonia borane for hydrogen production
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一种简单且可扩展的合成CoxCu1-xCo2O4@CoyCu1-yCo2O4蛋黄壳微球的路线，高性能水解氨硼烷制氢催化剂
作者：
Dongsheng Lu;Junhao Li;Chaohui Lin;Jinyun Liao;Yufa Feng;Zitian Ding;Zhiwei Li;Quanbing Liu;Hao Li
蛋黄壳结构的微纳米材料由于其独特的空间构型在不同领域有着广泛而重要的应用。在这项研究中，蛋黄壳结构的Co3O4@Co3O4是使用一个简单的和可扩展的水热反应，然后通过煅烧过程制备。然后，以Co3O4@Co3O4为前驱体，通过吸附和煅烧工艺合成了CoxCu 1 −xCo2O4@CoyCu1− yCo 2 O 4微球。根据表征结果，提出了蛋黄-壳结构的可能形成机制，这与以往研究中的蛋黄-壳结构不同。首次研究了卵黄壳结构催化剂在氨硼烷（AB）水解中的催化活性。发现蛋黄壳结构的CoxCu 1-xCo2O4@CoyCu1-yCo 2 O 4微球表现出高性能，转换频率（TOF）为81.8 molhydrogenmin-1 molcat-1。这是文献中报道的无贵金属催化剂的最高TOF值之一。此外，蛋黄壳结构的CoxCu 1 −xCo2O4@CoyCu1− yCo 2 O 4微球具有高度稳定性和可重复使用性。这些具有蛋黄-壳结构的CoxCu 1 −xCo2O4@CoyCu1− yCo 2 O 4微球具有优良的催化性能和较低的成本，是AB水解反应中很有希望的催化剂候选物。
Yolk–shell structured micro/nano‐sized materials have broad and important applications in different areas due to their unique spatial configurations. In this study, yolk–shell structured Co3O4@Co3O4is prepared using a simple and scalable hydrothermal reaction, followed by a calcination process. Then, CoxCu1−xCo2O4@CoyCu1−yCo2O4microspheres are synthesized via adsorption and calcination processes using the as‐prepared Co3O4@Co3O4as the precursor. A possible formation mechanism of the yolk–shell structures is proposed based on the characterization results, which is different from those of yolk–shell structures in previous study. For the first time, the catalytic activity of yolk–shell structured catalysts in ammonia borane (AB) hydrolysis is studied. It is discovered that the yolk–shell structured CoxCu1−xCo2O4@CoyCu1−yCo2O4microspheres exhibit high performance with a turnover frequency (TOF) of 81.8 molhydrogenmin−1molcat−1. This is one of the highest TOF values reported for a noble‐metal‐free catalyst in the literature. Additionally, the yolk–shell structured CoxCu1−xCo2O4@CoyCu1−yCo2O4microspheres are highly stable and reusable. These yolk–shell structured CoxCu1−xCo2O4@CoyCu1−yCo2O4microsphere is a promising catalyst candidate in AB hydrolysis considering the excellent catalytic behavior and low cost.