Authors
Hui Wei, Changmin Zhu, Xu Zhang, Yan Xu, Hanwen Tang, Jing Li, Xiaoyong Xu
Published in
Dalton transactions (Cambridge, England : 2003). Jul 27, 2026. Epub Jul 27, 2026.
Abstract
The electrochemical synthesis of hydrogen peroxide via the two-electron oxygen reduction reaction (2e- ORR) represents a sustainable alternative to the energy-intensive anthraquinone process. Its viability hinges on developing cost-effective catalysts with high activity and selectivity. Here, we report a rationally designed multi-dimensional heterostructure Ni-MoxC, composed of zero-dimensional Ni and MoxC nanoparticles and two-dimensional carbon sheets. By systematically tuning the Mo/Ni atomic ratio, we identify a volcano-type dependence of the 2e- ORR performance on catalyst composition. The optimal Ni-MoxC-10 catalyst exhibits exceptional selectivity for H2O2 (>93%) and remarkable stability over 27 hours of operation. Mechanistic investigations reveal that the performance apex arises from a synergistic interfacial effect induced by the precise stoichiometry. The optimal Mo/Ni ratio maximizes the formation of an active Ni-MoxC heterointerface, which collectively optimizes the adsorption energy of the *OOH intermediate, suppresses H2O2 decomposition, and facilitates rapid proton/electron transfer. This work highlights the critical role of compositional tuning in maximizing interfacial synergy within complex heterostructures, providing a guiding principle for the design of advanced electrocatalysts for on-demand H2O2 production.
PMID:
42504579
Bibliographic data and abstract were imported from PubMed on 27 Jul 2026.
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