Well-Defined Co2 Dual-Atom Catalyst Breaks Scaling Relations of Oxygen Reduction Reaction
The 4-electron oxygen reduction reaction (ORR) under alkaline conditions is central to the development of non-noble metal-based hydrogen fuel cell technologies. However, the kinetics of ORR are constrained by scaling relations, where the adsorption free energy of *OOH is intrinsically linked to that of *OH with a nearly constant difference larger than the optimal value. In this study, a well-defined binuclear Co2 complex was synthesized and adsorbed onto carbon black, serving as a model dual-atom catalyst. This catalyst achieved a record half-wave potential of 0.972 V versus the reversible hydrogen electrode in an alkaline electrolyte. Density functional theory simulations and in situ infrared spectroscopy revealed that the dual-atom site stabilizes the *OOH intermediate through bidentate coordination, thereby reducing the free energy gap between *OOH and *OH. By altering the adsorption configuration of *OOH on the dual-atom site, the scaling relations are effectively disrupted, leading to a significant enhancement in ORR activity.
WOS:001375004500001
EPFL
EPFL
2024-12-11
146
51
REVIEWED
EPFL
| Funder | Funding(s) | Grant Number | Grant URL |
National Natural Science Foundation of China (NSFC) | 22272073;22179058 | ||
Shenzhen Science and Technology Program | JCYJ20210324104414039, JCYJ20220818100410023, KCXST20221021111207017 | ||
Guangdong Grants | 2021ZT09C064 | ||
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