4.8 Article

Pseudo-Periodically Coupling Ni-O Lattice with Ce-O Lattice in Ultrathin Heteronanowire Arrays for Efficient Water Oxidation

期刊

SMALL
卷 17, 期 32, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202101727

关键词

Ce; -O; -Ni interface; charge injection; lattice coupling; oxygen evolution reaction; ultrathin nanowires

资金

  1. National Key R&D Program of China [2020YFA0406104, 2020YFA0406101]
  2. National MCF Energy R&D Program of China [2018YFE0306105]
  3. Innovative Research Group Project of the National Natural Science Foundation of China [51821002]
  4. National Natural Science Foundation of China [51725204, 21771132, 51972216, 52041202]
  5. Natural Science Foundation of Jiangsu Province [BK20190041]
  6. Key-Area Research and Development Program of GuangDong Province [2019B010933001]
  7. Collaborative Innovation Center of Suzhou Nano Science Technology
  8. 111 Project

向作者/读者索取更多资源

A unique dual metal oxides lattice coupling strategy was proposed to fabricate NiO/CeO2 nanowires arrays, which exhibited excellent electrochemical performance as a precatalyst for oxygen evolution reaction (OER), showing low overpotential and impressive cycle durability. The atomic coupling of CeO2 was found to significantly promote the generation of oxygen vacancies, expedite the phase transformation of NiO, and effectively inhibit the aggregation of NiOOH nanodomains, optimizing the reaction free energy towards oxygen-containing intermediates.
Transition metal oxides (TMOs) have been under the spotlight as promising precatalysts for electrochemical oxygen evolution reaction (OER) in alkaline media. However, the slow and incomplete self-reconstruction from TMOs to (oxy)hydroxides as well as the formed (oxy)hydroxides with unmodified electronic structure gives rise to the inferior OER performance to the noble metal oxide ones. Herein, a unique dual metal oxides lattice coupling strategy is proposed to fabricate carbon cloth-supported ultrathin nanowires arrays, which are composed of pseudo-periodically welded NiO with CeO2 nanocrystals (NiO/CeO2 NW@CC). When served as an OER precatalyst in 1.0 m KOH, the NiO/CeO2 NW@CC shows an ultralow overpotential of 330 mV at 50 mA cm(-2), along with an impressive cycle durability of more than 3 days even at 50 mA cm(-2), surpassing CC-supported NiO and commercial IrO2 catalysts. The combined experimental and theoretical investigations unveil that the atomic coupling of CeO2 can not only appreciably trigger the generation of oxygen vacancies and expedite phase transformation of NiO into active NiOOH, but also in situ create a chemical bond with the formed NiOOH and enable the electron injection, thus effectively inhibiting the aggregation of the accessible NiOOH nanodomains and optimizing their reaction free energy towards oxygen-containing intermediates.

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