Tailoring Pore Size and Catalytic Activity in Cobalt Iron Layered Double Hydroxides and Spinels by Microemulsion-Assisted pH-Controlled Co-Precipitation

被引：5

作者：

Rabe, Anna ^{[1
,2
,3
]}

Jaugstetter, Maximilian ^{[4
]}

Hiege, Felix ^{[4
]}

Cosanne, Nicolas ^{[3
]}

Ortega, Klaus Friedel ^{[3
]}

Linnemann, Julia ^{[4
]}

Tschulik, Kristina ^{[4
]}

Behrens, Malte ^{[1
,2
,3
,5
]}

机构：

[1] Univ Duisburg Essen, Fac Chem, Univ Str 7, D-45141 Essen, Germany

[2] Ctr Nanointegrat Duisburg Essen CENIDE, Univ Str 7, D-45141 Essen, Germany

[3] Christian Albrechts Univ Kiel, Inst Inorgan Chem, Max Eyth Str 2, D-24118 Kiel, Germany

[4] Ruhr Univ Bochum, Fac Chem & Biochem, Analyt Chem 2, D-44801 Bochum, Germany

[5] Gwangju Inst Sci GIST, Ertl Ctr Electrochem & Catalysis, 123 Cheomdan gwagiro Oryang dong, Gwangju 500712, South Korea

来源：

CHEMSUSCHEM | 2023年 / 16卷 / 10期

关键词：

cobalt iron spinel; microemulsion-assisted co-precipitation; layered double hydroxides; structure-activity relationships; water splitting; OXYGEN; EVOLUTION; CO3O4; NANOPARTICLES; ELECTROCATALYSTS; NANOSTRUCTURES; DECOMPOSITION; MORPHOLOGY; LDH; STABILITY;

D O I：

10.1002/cssc.202202015

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cobalt iron containing layered double hydroxides (LDHs) and spinels are promising catalysts for the electrochemical oxygen evolution reaction (OER). Towards development of better performing catalysts, the precise tuning of mesostructural features such as pore size is desirable, but often hard to achieve. Herein, a computer-controlled microemulsion-assisted co-precipitation (MACP) method at constant pH is established and compared to conventional co-precipitation. With MACP, the particle growth is limited and through variation of the constant pH during synthesis the pore size of the as-prepared catalysts is controlled, generating materials for the systematic investigation of confinement effects during OER. At a threshold pore size, overpotential increased significantly. Electrochemical impedance spectroscopy (EIS) indicated a change in OER mechanism, involving the oxygen release step. It is assumed that in smaller pores the critical radius for gas bubble formation is not met and therefore a smaller charge-transfer resistance is observed for medium frequencies.

引用

页数：14