期刊
SMALL
卷 18, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103106
关键词
electrocatalysis; hollow superstructure; metal sulfide; metal-organic frameworks; Ti doping
类别
资金
- National Natural Science Foundation of China [NSFC 22075085, 21905092, 51908218]
- CAS/SAFEA International Partnership Program, Shanghai Science and Technology Foundation [19JC1412100]
- Fundamental Research Funds for the Central Universities
The unique pacman-like titanium-doped cobalt sulfide hollow superstructure (Ti-CoSx HSS) has been fabricated as an OER electrocatalyst using a prearranged metal-organic framework (MOF)-on-MOF heterostructure as a precursor treated by one-pot sulfidation. The Ti-CoSx HSS exhibits excellent OER performance with increased active site exposure, enhanced electron and mass transfer. This strategy enabled by MOF-on-MOF paves the way toward innovative MOF derivatives for various applications.
Transition-metal sulfides (TMSs) are attractive oxygen evolution reaction (OER) electrocatalysts. Developing new strategies to improve their electrochemical performance of TMSs is of great significance. Herein, a unique pacman-like titanium-doped cobalt sulfide hollow superstructure (Ti-CoSx HSS) is fabricated as an OER electrocatalyst. Using a prearranged metal-organic framework (MOF)-on-MOF heterostructure as a precursor treated by one-pot sulfidation, a sequential structural conversion process leads to the formation of Ti-CoSx HSS, which is assembled by interconnected Ti-doped CoSx nanocages around a cake-like cavity. Benefiting from the architecture and compositional advantages, Ti-CoSx HSS exhibits excellent OER performance with an overpotential of 249 mV at 10 mA cm(-2) and Tafel slope of 45.5 mV dec(-1) due to increased active site exposure, enhanced electron and mass transfer. This strategy enabled by MOF-on-MOF paves the way toward innovative MOF derivatives for various applications.
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