Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 269, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118782
Keywords
LDH nanocages; Pt nanocluster; Co-Pt-OH; Electronic pump; Oxygen evolution reaction
Funding
- National Natural Science Foundation of China [21976066, U1662109]
- Program of Introducing Talents of Discipline to Universities of China (111 program) [B17019]
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The acceleration of electron transfer through the regulation of coordination environment of active sites is an effective way to improve reaction performances. Herein, cobalt layered double hydroxide decorated with sub-1 nm platinum clusters (Pt/Co-LDH) were synthesized for oxygen evolution reaction (OER). The integration of platinum unexpectedly induced unique nanocage structures assembled by ultra-thin LDH nanosheets via an insitu redox process. The as-prepared Pt/Co-LDH nanocages exhibit high OER activity with a low overpotential of 265 mV at 10 mA cm(-2). Experiments and density functional theory calculations indicate the high catalytic activity is mainly attributed to the strong interactions between Pt and Co-LDH, which can regulate the local coordination environment and electronic structures of cobalt. The well-defined Co-Pt - OH structures could help promote the adsorption energy of water molecules and reduce the energy barrier of rate-limiting step, benefiting from the enhanced electron transfer during the electrocatalytic process, playing the role of electronic pump. Furthermore, the novel in-situ redox synthetic strategy also presents a facile universality to obtain metal-doped (Pt, Au, Pd) Co-LDH nanocage structures.
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