The regulation mechanism of V-shaped 103 nano-twin grain boundary on OER performance of rutile RuO2

作者：Wu, Jingjing; Zhao, Huining; Tang, Xin^*

来源：Applied Surface Science, 2022, 578: 151900.

DOI：10.1016/j.apsusc.2021.151900

• Nano-twin grain boundary
• Oxygen evolution reaction
• First-principles calculation

During the oxygen evolution reaction (OER), surface oxygen adsorption plays a crucial role in electrocatalysis. The stability of surface adsorption is closely related to the surface morphology of the catalyst. As one of the Vshaped nanotwins, 103 nano-twin grain boundary (103-TGB) has a special roof structure, which results in the presence of double dangling-O atoms at the junction of 103-TGB with (110) surface. In contrast to the ideal RuO2, the d-band center of Ru atoms located on the surface of 103-TGB is shifted to the Fermi level by 1.66 eV. Moreover, the key intermediates, namely *OH, *O, and *OOH, have suitable adsorption energies, providing a lower overpotential of OER (I(over cap)center dot(OER)), via adsorbate evolving mechanism (AEM), of just 0.45 eV. Therefore, the OER via AEM is strongly focused on site 02 with double dangling-O atoms, revealing a synergistic effect due to the presence of both the 103-TGB defect and (110) surface.

• 单位
  桂林理工大学