TY - JOUR
T1 - Tuning the reversible chemisorption of hydroxyl ions to promote the electrocatalysis on ultrathin metal-organic framework nanosheets
AU - Yu, Hong
AU - Jing, Yao
AU - Du, Cheng Feng
AU - Wang, Jiong
N1 - Publisher Copyright:
© 2021 Science Press
PY - 2022/2
Y1 - 2022/2
N2 - Interfacial engineering to alter the configuration of active sites in heterogeneous catalysts is a potential strategy for activity enhancement, but it remains unelucidated for metal-organic frameworks (MOFs). Here, we demonstrate that the surface of two-dimensional Co-based MOF is modified by decorating Ag quantum dots (QDs) simply through in-situ reduction of Ag+ ions. Toward oxygen evolution reaction (OER), it reveals that the catalysis is mediated by the reversible redox of Co sites between Co3+ and Co4+ states coupling with transfer of OH− ions. The decoration of Ag QDs decreases the redox potential of Co sites, and thus effectively decreases the overpotential of OER. The TOFs of Co sites are increased by 77 times to reach 5.4 s−1 at an overpotential of 0.35 V. We attribute the activity enhancement to the tuning of the coupling process between Co sites and OH− ions during the redox of Co sites by Ag QDs decoration based on Pourbaix analysis.
AB - Interfacial engineering to alter the configuration of active sites in heterogeneous catalysts is a potential strategy for activity enhancement, but it remains unelucidated for metal-organic frameworks (MOFs). Here, we demonstrate that the surface of two-dimensional Co-based MOF is modified by decorating Ag quantum dots (QDs) simply through in-situ reduction of Ag+ ions. Toward oxygen evolution reaction (OER), it reveals that the catalysis is mediated by the reversible redox of Co sites between Co3+ and Co4+ states coupling with transfer of OH− ions. The decoration of Ag QDs decreases the redox potential of Co sites, and thus effectively decreases the overpotential of OER. The TOFs of Co sites are increased by 77 times to reach 5.4 s−1 at an overpotential of 0.35 V. We attribute the activity enhancement to the tuning of the coupling process between Co sites and OH− ions during the redox of Co sites by Ag QDs decoration based on Pourbaix analysis.
KW - 2D metal-organic frameworks
KW - Chemisorption of hydroxyl ions
KW - Interfacial engineering
KW - Oxygen evolution reaction
KW - Pourbaix analysis
UR - http://www.scopus.com/inward/record.url?scp=85107628790&partnerID=8YFLogxK
U2 - 10.1016/j.jechem.2021.05.029
DO - 10.1016/j.jechem.2021.05.029
M3 - 文章
AN - SCOPUS:85107628790
SN - 2095-4956
VL - 65
SP - 71
EP - 77
JO - Journal of Energy Chemistry
JF - Journal of Energy Chemistry
ER -