A Pacman‐Like Titanium‐Doped Cobalt Sulfide Hollow Superstructure for Electrocatalytic Oxygen Evolution. Issue 4 (10th November 2021)

• Record Type: Journal Article
• Authors: Bao, Tong; Xia, Yi; Lu, Jingyi; Zhang, Chaoqi; Wang, Jing; Yuan, Ling; Zhang, Yunxia; Liu, Chao; Yu, Chengzhong
• Is Part Of: Small. Volume 18:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-10
• Subjects: electrocatalysis -- hollow superstructure -- metal sulfide -- metal–organic frameworks -- Ti doping; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202103106
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 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. Abstract : A distinctive pacman‐like titanium‐doped cobalt sulfide hollow superstructure is reported, which is synthesized by using prearranged metal‐organic framework (MOF)‐on‐MOF hybrid as a precursor followed by sequential structural conversion process. Benefiting from the architectural and compositional merits, the intricate superstructure exhibits excellent performance for electrocatalytic oxygen evolution reaction.