NiMn layered double hydroxide nanosheets/NiCo2O4 nanowires with surface rich high valence state metal oxide as an efficient electrocatalyst for oxygen evolution reaction
Artikel i vetenskaplig tidskrift, 2018

High valence transition metal oxide is significant for anode catalyst of proton membrane water electrolysis technique. Herein, we demonstrate NiMn layered double hydroxide nanosheets/NiCo 2 O 4 nanowires hierarchical nanocomposite catalyst with surface rich high valence metal oxide as an efficient catalyst for oxygen evolution reaction. A low overpotential of 310 mV is needed to drive a 10 mA cm −2 with a Tafel slope of 99 mV dec −1 , and a remarkable stability during 8 h is demonstrated in a chronoamperometry test. Theoretical calculation displays the change in the rate-determining step on the nanocomposite electrode in comparison to NiCo 2 O 4 nanowires alone. It is found high valence Ni and Mn oxide in the catalyst system can efficiently facilitate the charge transport across the electrode/electrolyte interface. The enhanced electrical conductivity, more accessible active sites and synergistic effects between NiMn layered double hydroxide nanosheets and NiCo 2 O 4 nanowires can account for the excellent oxygen evolution reaction. The catalytic performance is comparable to most of the best non-noble catalysts and IrO 2 noble catalyst, indicating the promising applications in water-splitting technology. It is an important step in the development of hierarchical nanocomposites by surface valence state tuning as an alternative to noble metals for oxygen evolution reaction.

Layered double hydroxide

Water electrolysis

Charge transport

Oxygen evolution reaction

High valence metal oxide

Författare

Liting Yang

Yangzhou University

Lin Chen

Chalmers, Fysik, Kemisk fysik

Dawen Yang

Yangzhou University

Xu Yu

Yangzhou University

Huaiguo Xue

Yangzhou University

Ligang Feng

Yangzhou University

Journal of Power Sources

0378-7753 (ISSN)

Vol. 392 23-32

Ämneskategorier

Materialkemi

Annan kemiteknik

Annan kemi

DOI

10.1016/j.jpowsour.2018.04.090