Nanocast Mixed Ni-Co-Mn Oxides with Controlled Surface and Pore Structure for Electrochemical Oxygen Evolution Reaction

被引:31
作者
Priamushko, Tatiana [1 ]
Guillet-Nicolas, Remy [1 ]
Yu, Mingquan [2 ]
Doyle, Matthew [1 ]
Weidenthaler, Claudia [2 ]
Tueysuez, Harun [2 ]
Kleitz, Freddy [1 ]
机构
[1] Univ Vienna, Dept Inorgan Chem Funct Mat, Fac Chem, A-1090 Vienna, Austria
[2] Max Planck Inst Kohlenforsch, Dept Heterogeneous Catalysis, D-45470 Mulheim, Germany
来源
ACS APPLIED ENERGY MATERIALS | 2020年 / 3卷 / 06期
关键词
electrocatalysts; OER; mesoporous materials; nanocasting; non-noble metals; mixed metal oxides; spinel; MESOPOROUS COBALT OXIDE; METAL-OXIDES; BIFUNCTIONAL ELECTROCATALYST; CO3O4; NANOPARTICLES; ENERGY-STORAGE; EFFICIENT; CARBON; OXIDATION; REDUCTION; CATALYSTS;
D O I
10.1021/acsaem.0c00544
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanocasting or hard-templating is a versatile method to produce ordered mesoporous mixed transition metal oxides (MTMOs) with promising potential for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, a comprehensive investigation was conducted on various NixCoyMnzO4 replicated from large pore KIT-6 silica. The materials were calcined at different temperatures to study the influence of the oxide formation and the resulting pore structure ordering, as well as surface properties, on the electrochemical activity and stability of the catalysts. After a comprehensive characterization, electrocatalytic performances of the materials were investigated in detail for OER to find a structure-activity relationship. In OER, a correlation was established between calcination temperature, pore and surface properties, and the overall efficiency and stability. The best sample, NixCoyMnzO4 calcined at 300 degrees C, provided a reasonable current density (25 mA/cm(2) at 1.7 V vs RHE) and an overpotential of 400 mV at 10 mA/cm(2), and demonstrated increased current density (above 200 mA/cm(2) at 1.7 V vs RHE) once loaded into a Ni foam compared to the bare foam. This sample also remained stable over 15 h. Our results indicate that the calcination temperature greatly affects the porosity, crystalline structure, phase composition, and the activity of the catalysts toward OER.
引用
收藏
页码:5597 / 5609
页数:13
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