不同磷酸银晶面选控丙烯室温高产率电化学氧化制环氧丙烷

电化学能源科学与技术 2022-02-21
567 字丨阅读本文需 4 分钟

不完全氧化不好做。

看到这种文章,有美学感受,但总让人疑惑,反应是否有可能发生在点、线而不是在面上呢?

能否合成不同大小的纳米晶或者大面积单晶证否一下?

磷酸银不导电,竟然可以做电催化剂完成电荷分离和转移,令人惊讶。

温度调变会怎样?

都是在水溶液中实现,环氧丙烷的应用是否需要分离?

Facet-dependent electrooxidation of propylene into propylene oxide over Ag3PO4 crystals

Jingwen Ke,

Jiankang Zhao,

Mingfang Chi,

Menglin Wang,

Xiangdong Kong,

Qixuan Chang,

Weiran Zhou,

Chengxuan Long,

Jie Zeng &

Zhigang Geng

Nature Communications volume 13, Article number: 932 (2022)

Abstract

The electrooxidation of propylene into propylene oxide under ambient conditions represents an attractive approach toward propylene oxide. However, this process suffers from a low yield rate over reported electrocatalysts. In this work, we develop an efficient electrocatalyst of Ag3PO4 for the electrooxidation of propylene into propylene oxide. The Ag3PO4 cubes with (100) facets exhibit the highest yield rate of 5.3 gPO m−2 h−1 at 2.4 V versus reversible hydrogen electrode, which is 1.6 and 2.5 times higher than those over Ag3PO4 rhombic dodecahedra with (110) facets and tetrahedra with (111) facets, respectively. The theoretical calculations reveal that the largest polarization of propylene on Ag3PO4 (100) facets is beneficial to break the symmetric π bonding and facilitate the formation of C-O bond. Meanwhile, Ag3PO4(100) facets exhibit the lowest adsorption energies of *C3H6 and *OH, inducing the lowest energy barrier of the rate-determining step and thus accounting for the highest catalytic performance.

室温调变反应物浓度或反应物种类就可以生产三种不同暴露晶面的磷酸银。

具有择优晶面取向的XRD图

反应产物的差异

反应能垒不同

耿志刚

纳米材料的可控合成、微结构设计及其在非极性小分子电化学转化方面的催化反应研究。


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