TY - JOUR
T1 - Iridium single atoms coupling with oxygen vacancies boosts oxygen evolution reaction in acid media
AU - Xi, Pinxian
AU - Huang, Bolong
AU - Yin, Jie
AU - Jin, Jing
AU - Lu, Min
AU - Zhang, Hong
AU - Peng, Yong
AU - Yan, Chun Hua
N1 - Funding Information:
We acknowledge support from the National Natural Science Foundation of China (No. 21931001, 21922105, 51771085, and 51801088) as well as The Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province (2019ZX-04) and the 111 Project (B20027). B.H. acknowledges the support of the Natural Science Foundation of China (NSFC) (No. 21771156) and the Early Career Scheme (ECS) fund (Grant PolyU 253026/16P) from the Research Grant Council (RGC) in Hong Kong. J.Y. acknowledges the support of the National Postdoctoral Program for Innovative Talents (BX20200157).
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/10/28
Y1 - 2020/10/28
N2 - Simultaneous realization of improved activity, enhanced stability, and reduced cost remains a desirable yet challenging goal in the search of electrocatalysis oxygen evolution reaction (OER) in acid. Herein, we report a novel strategy to prepare iridium single-atoms (Ir-SAs) on ultrathin NiCo2O4 porous nanosheets (Ir-NiCo2O4 NSs) by the co-electrodeposition method. The surface-exposed Ir-SAs couplings with oxygen vacancies (VO) exhibit boosting the catalysts OER activity and stability in acid media. They display superior OER performance with an ultralow overpotential of 240 mV at j = 10 mA cm-2 and long-term stability of 70 h in acid media. The TOFs of 1.13 and 6.70 s-1 at an overpotential of 300 and 370 mV also confirm their remarkable performance. Density functional theory (DFT) calculations reveal that the prominent OER performance arises from the surface electronic exchange-andtransfer activities contributed by atomic Ir incorporation on the intrinsic VO existed NiCo2O4 surface. The atomic Ir sites substantially elevate the electronic activity of surface lower coordinated Co sites nearby VO, which facilitate the surface electronic exchange-and-transfer capabilities. With this trend, the preferred H2O activation and stabilized ∗O have been reached toward competitively lower overpotential. This is a generalized key for optimally boosting OER performance.
AB - Simultaneous realization of improved activity, enhanced stability, and reduced cost remains a desirable yet challenging goal in the search of electrocatalysis oxygen evolution reaction (OER) in acid. Herein, we report a novel strategy to prepare iridium single-atoms (Ir-SAs) on ultrathin NiCo2O4 porous nanosheets (Ir-NiCo2O4 NSs) by the co-electrodeposition method. The surface-exposed Ir-SAs couplings with oxygen vacancies (VO) exhibit boosting the catalysts OER activity and stability in acid media. They display superior OER performance with an ultralow overpotential of 240 mV at j = 10 mA cm-2 and long-term stability of 70 h in acid media. The TOFs of 1.13 and 6.70 s-1 at an overpotential of 300 and 370 mV also confirm their remarkable performance. Density functional theory (DFT) calculations reveal that the prominent OER performance arises from the surface electronic exchange-andtransfer activities contributed by atomic Ir incorporation on the intrinsic VO existed NiCo2O4 surface. The atomic Ir sites substantially elevate the electronic activity of surface lower coordinated Co sites nearby VO, which facilitate the surface electronic exchange-and-transfer capabilities. With this trend, the preferred H2O activation and stabilized ∗O have been reached toward competitively lower overpotential. This is a generalized key for optimally boosting OER performance.
UR - http://www.scopus.com/inward/record.url?scp=85094933104&partnerID=8YFLogxK
U2 - 10.1021/jacs.0c05050
DO - 10.1021/jacs.0c05050
M3 - Journal article
C2 - 32955265
AN - SCOPUS:85094933104
SN - 0002-7863
VL - 142
SP - 18378
EP - 18386
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 43
ER -