期刊
NANOSCALE
卷 9, 期 42, 页码 16256-16263出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr05867e
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资金
- National Natural Science Foundation of China [21631004, 21371053, 21573062]
- Science Fund for Distinguished Young Scholars of Heilongjiang University [JCL201501]
- Fundamental Research Funds for the Heilongjiang University of Heilongjiang Province of China [HDRCCX-2016Z02]
Manipulating the electrical conductivity and morphology of Co-based (hydr) oxides is significant for optimizing energy conversion in the oxygen evolution reaction (OER). Herein, 2D CoSex nanocrystallinedotted porous CoCo layered double hydroxide nanosheets (Co-Se NSs) were designed and synthesized via a modified in situ reduction and interface-directed assembly in an inert atmosphere. During the synchronous reduction/precipitation reaction between Co2+-oleylamine and NaHSe at the toluene-water interface, the hydrated Co-O and Co-Se clusters are generated and sequentially assemble under strong extrusion driven by the interfacial tension. Owing to the enriched vacancies on the lateral surfaces, the obtained loose and porous Co-Se NS presents low crystallinity. Moreover, electrons could spontaneously transfer from the CoCo LDH to the neighboring CoSex nanocrystallites due to the stronger electron-withdrawing capability of metallic CoSex, and thus more Co atoms in the CoCo layered double hydroxide (LDH) present a high oxidation state. This synergistic manipulation in the structure, component, and electron configuration of the Co-Se NS can increase the density of the OER active-sites, improve the electrical conductivity, and also offer a large accessible surface area and permeable channels for ion adsorption and transport. As a result, the resulting Co-Se NSs feature high catalytic activity towards OER, in particular a low onset potential of 1.48 V and an overpotential of only 290 mV at a current density of 10 mA cm(-2) for the Co-Se-2 NS, as well as good stability in an accelerated durability test. The strategy developed here provides a reliable and valid way to synthesize multicomponent NSs, and is able to be extended to other areas of application.
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