A Pacman-Like Titanium-Doped Cobalt Sulfide Hollow Superstructure for Electrocatalytic Oxygen Evolution

作者：Bao, Tong; Xia, Yi; Lu, Jingyi; Zhang, Chaoqi; Wang, Jing; Yuan, Ling; Zhang, Yunxia; Liu, Chao^*; Yu, Chengzhong^*

来源：Small, 2022, 18(4): 2103106.

DOI：10.1002/smll.202103106

• electrocatalysis
• hollow superstructure
• metal sulfide
• metal-organic frameworks
• Ti doping

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.

• 单位
  中国科学院