Porous calcium-manganese oxide microspheres for electrocatalytic oxygen reduction with high activity

被引：169

作者：

Han, Xiaopeng ^{[1
]}

Zhang, Tianran ^{[1
]}

Du, Jing ^{[1
]}

Cheng, Fangyi ^{[1
,2
]}

Chen, Jun ^{[1
,2
]}

机构：

[1] Nankai Univ, Coll Chem, Inst New Energy Mat Chem, Tianjin 300071, Peoples R China

[2] Nankai Univ, Coll Chem, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China

来源：

CHEMICAL SCIENCE | 2013年 / 4卷 / 01期

关键词：

REACTION ORR; CATALYSTS; NANOPARTICLES; O-2; REQUIREMENTS; MECHANISM; OXIDATION; ELECTRODE; PLATINUM; GRAPHENE;

D O I：

10.1039/c2sc21475j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of calcium-manganese oxides (Ca-Mn-O) were prepared through thermal decomposition of carbonate solid-solution precursors and investigated as electrocatalysts for oxygen reduction reaction (ORR). The synthesized crystalline Ca-Mn-O compounds, including perovskite-type CaMnO3, layered structured Ca2Mn3O8, post-spinel CaMn2O4 and CaMn3O6, presented similar morphologies of porous microspheres with agglomerated nanoparticles. Electrochemical results, surface analysis, and computational studies revealed that the catalytic activities of Ca-Mn-O oxides, in terms of onset potential, reduction current, and transferred electron number, depended strongly on both the surface Mn oxidation state and the crystallographic structures. Remarkably, the as-synthesized CaMnO3 and CaMn3O6 exhibited considerable activity and enabled an apparent quasi 4-electron oxygen reduction with low yield of peroxide species in alkaline solutions, suggesting their potential applications as cheap and abundant ORR catalysts.

引用

页码：368 / 376

页数：9

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