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Synergistic engineering of architecture and composition in NiCoMoO@CoMoO nanobrush arrays towards efficient overall water splitting electrocatalysis. | LitMetric

AI Article Synopsis

  • A new approach using molybdenum-based compounds on activated nickel foam enhances electrocatalyst efficiency for water splitting.
  • The resulting structure, NiCoMoO@CoMoO, features a unique 3D hierarchical design that integrates one-dimensional and two-dimensional components for improved surface reactions.
  • With low overpotentials and robust stability, this technique highlights the potential for innovative nanostructures and compositional tweaks to create better materials for renewable energy applications.

Article Abstract

Implementing the hierarchical structures of non-noble-metal-based electrocatalysts and modulating their composition can help accelerate surface reactions and fulfill the promise of renewable energy devices via water splitting. Herein, molybdenum-based compounds are constructed on activated nickel foam (act-NF) by a one-step hydrothermal growth. The product generated on the act-NF is NiCoMoO@CoMoO, with a novel 3D hierarchical heterostructure, wherein the one-dimensional CoMoO nanorods are hierarchically integrated with the two-dimensional NiCoMoO nanosheets (NCMO@CMO/act-NF). The formation of NiCoMoO@CoMoO attributes to the release and diffusion of Ni from act-NF. Heterogeneous NiCoMoO@CoMoO has compositional differences, and synergistic interaction between cobalt and nickel results in the modulated electronic states. Meanwhile, the hierarchical structure facilitates the exposure of active sites. Combining these two advantages, NCMO@CMO/act-NF presents a low η value of 61 and 180 mV in 1.0 M KOH for the HER and OER, respectively, and it shows a low cell voltage of 1.46 V for overall water splitting with robust stability. DFT calculations reveal that Ni doping leads to the charge depletion of Co, which further optimizes the d-band center of metal sites and tunes the adsorption of adsorbates to facilitate the water splitting reaction. Thus, a promising strategy of incorporating the nanostructure design with compositional modulation is presented to develop functional materials for energy conversion.

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Source
http://dx.doi.org/10.1039/c9nr08281fDOI Listing

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