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Synergistic engineering of architecture and composition in [email protected] nanobrush arrays towards efficient overall water splitting electrocatalysis.

Authors
  • Li, Zekun1
  • Zheng, Mingyue2
  • Zhao, Xian2
  • Yang, Jun3
  • Fan, Weiliu1
  • 1 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China. [email protected] , (China)
  • 2 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China. , (China)
  • 3 Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. , (China)
Type
Published Article
Journal
Nanoscale
Publisher
The Royal Society of Chemistry
Publication Date
Dec 21, 2019
Volume
11
Issue
47
Pages
22820–22831
Identifiers
DOI: 10.1039/c9nr08281f
PMID: 31750494
Source
Medline
Language
English
License
Unknown

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 [email protected], with a novel 3D hierarchical heterostructure, wherein the one-dimensional CoMoO4 nanorods are hierarchically integrated with the two-dimensional NixCo1-xMoO4 nanosheets ([email protected]/act-NF). The formation of [email protected] attributes to the release and diffusion of Ni2+ from act-NF. Heterogeneous [email protected] 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, [email protected]/act-NF presents a low η10 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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