期刊
CHEMSUSCHEM
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202202015
关键词
cobalt iron spinel; microemulsion-assisted co-precipitation; layered double hydroxides; structure-activity relationships; water splitting
A computer-controlled microemulsion-assisted co-precipitation method is established to control the pore size of catalysts for the electrochemical oxygen evolution reaction. It is found that when the pore size reaches a certain threshold, the overpotential increases significantly and the oxygen release mechanism changes. These findings are of great importance for the development of better catalysts.
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.
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