TY - JOUR
T1 - Surface-Reconstructed Ru-Doped Nickel/Iron Oxyhydroxide Arrays for Efficient Oxygen Evolution
AU - Kim, Daekyu
AU - Park, Sumin
AU - Choi, Juhyung
AU - Piao, Yuanzhe
AU - Lee, Lawrence Yoon Suk
N1 - Funding Information:
D.K. and S.P. contributed equally to this work. The authors acknowledge the support from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (Grant No. 20215710100170), the Hong Kong Polytechnic University (Q‐CDAG and 1‐ZVST), and the Research Grants Council of the Hong Kong SAR (Grant No. PolyU15217521). This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. NRF‐2022R1A6A3A01085806). D.K. acknowledges the award of the Hong Kong Ph.D. Fellowship.
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/9/19
Y1 - 2023/9/19
N2 - The generation of an active phase through dynamic surface reconstruction is a promising strategy for improving the activity of electrocatalysts. However, studies investigating the reconstruction process and its impact on the intrinsic properties of the catalysts are scarce. Herein, the surface reconstruction of NiFe2O4 interfaced with NiMoO4 (Ru–NFO/NMO) facilitated by Ru doping is reported. The electrochemical and material characterizations demonstrate that Ru doping can regulate the electronic structure of NFO/NMO and induce the high-valence state of Ni3.6+δ, facilitating the surface reconstruction to highly active Ru-doped NiFeOOH/NiOOH (SR-Ru–NFO/NMO). The optimized SR-Ru–NFO/NMO exhibits promising performance in the oxygen evolution reaction, displaying a low overpotential of 229 mV at 10 mA cm−2 and good stability at varying current densities for 80 h. Density functional theory calculations indicate that Ru doping can increase the electron density and optimize intermediate adsorption by shifting the d-band center downward. This work provides valuable insights into the tuning of electrocatalysts by surface reconstruction and offers a rational design strategy for the development of highly active oxygen evolution reaction electrocatalysts.
AB - The generation of an active phase through dynamic surface reconstruction is a promising strategy for improving the activity of electrocatalysts. However, studies investigating the reconstruction process and its impact on the intrinsic properties of the catalysts are scarce. Herein, the surface reconstruction of NiFe2O4 interfaced with NiMoO4 (Ru–NFO/NMO) facilitated by Ru doping is reported. The electrochemical and material characterizations demonstrate that Ru doping can regulate the electronic structure of NFO/NMO and induce the high-valence state of Ni3.6+δ, facilitating the surface reconstruction to highly active Ru-doped NiFeOOH/NiOOH (SR-Ru–NFO/NMO). The optimized SR-Ru–NFO/NMO exhibits promising performance in the oxygen evolution reaction, displaying a low overpotential of 229 mV at 10 mA cm−2 and good stability at varying current densities for 80 h. Density functional theory calculations indicate that Ru doping can increase the electron density and optimize intermediate adsorption by shifting the d-band center downward. This work provides valuable insights into the tuning of electrocatalysts by surface reconstruction and offers a rational design strategy for the development of highly active oxygen evolution reaction electrocatalysts.
KW - electronic structure modulation
KW - heterostructures
KW - oxygen evolution reaction
KW - ruthenium doping
KW - surface reconstruction
UR - http://www.scopus.com/inward/record.url?scp=85171444666&partnerID=8YFLogxK
U2 - 10.1002/smll.202304822
DO - 10.1002/smll.202304822
M3 - Journal article
AN - SCOPUS:85171444666
SN - 1613-6810
VL - 20
JO - Small
JF - Small
IS - 5
M1 - 2304822
ER -
