TY - JOUR
T1 - Balancing Activity and Stability in Spinel Cobalt Oxides through Geometrical Sites Occupation towards Efficient Electrocatalytic Oxygen Evolution
AU - An, Li
AU - Zhang, Hong
AU - Zhu, Jiamin
AU - Xi, Shibo
AU - Huang, Bolong
AU - Sun, Mingzi
AU - Peng, Yong
AU - Xi, Pinxian
AU - Yan, Chun Hua
N1 - Funding Information:
We acknowledge support from the National Natural Science Foundation of China (No. 22201111, 21922105, 21931001, and 22271124), the National Key R&D Program of China (2021YFA1501101), and the National Natural Science Foundation of Gansu Province (22JR5RA470), the Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province (2019ZX‐04) and the 111 Project (B20027). We also acknowledge support from the Fundamental Research Funds for the Central Universities (lzujbky‐2021‐sp62). 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.
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2023/1/16
Y1 - 2023/1/16
N2 - Designing active and stable oxygen evolution reaction (OER) catalysts are vitally important to various energy conversion devices. Herein, we introduce elements Ni and Mn into (Co)tet(Co2)octO4 nanosheets (NSs) at fixed geometrical sites, including Mnoct, Nioct, and Nitet, to optimize the initial geometrical structure and modulate the CoCo2O4 surface from oxygen-excess to oxygen-deficiency. The pristine (Ni,Mn)-(Co)tet(Co2)octO4 NSs shows excellent OER activity with an overpotential of 281.6 mV at a current density of 10 mA cm−2. Moreover, without damaging their initial activity, the activated (Act)-(Ni,Mn)-(Co)tet(Co2)octO4 NSs after surface reconstruction exhibit long-term stability of 100 h under 10 mA cm−2, 50 mA cm−2, or even 100 mA cm−2. The optimal balance between electroactivity and stability leads to remarkable OER performances, providing a pivotal guideline for designing ideal electrocatalysts and inspiring more works to focus on the dynamic change of each occupation site component.
AB - Designing active and stable oxygen evolution reaction (OER) catalysts are vitally important to various energy conversion devices. Herein, we introduce elements Ni and Mn into (Co)tet(Co2)octO4 nanosheets (NSs) at fixed geometrical sites, including Mnoct, Nioct, and Nitet, to optimize the initial geometrical structure and modulate the CoCo2O4 surface from oxygen-excess to oxygen-deficiency. The pristine (Ni,Mn)-(Co)tet(Co2)octO4 NSs shows excellent OER activity with an overpotential of 281.6 mV at a current density of 10 mA cm−2. Moreover, without damaging their initial activity, the activated (Act)-(Ni,Mn)-(Co)tet(Co2)octO4 NSs after surface reconstruction exhibit long-term stability of 100 h under 10 mA cm−2, 50 mA cm−2, or even 100 mA cm−2. The optimal balance between electroactivity and stability leads to remarkable OER performances, providing a pivotal guideline for designing ideal electrocatalysts and inspiring more works to focus on the dynamic change of each occupation site component.
KW - decoupled proton-electron transfer
KW - geometrical site occupation
KW - OER
KW - surface reconstruction
KW - well-balanced performance
UR - http://www.scopus.com/inward/record.url?scp=85143625088&partnerID=8YFLogxK
U2 - 10.1002/anie.202214600
DO - 10.1002/anie.202214600
M3 - Journal article
C2 - 36367220
AN - SCOPUS:85143625088
SN - 1433-7851
VL - 62
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 3
M1 - e202214600
ER -