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Utilizing the Space‐Charge Region of the FeNi‐LDH/CoP p‐n Junction to Promote Performance in Oxygen Evolution Electrocatalysis
Author(s) -
He Kai,
Tadesse Tsega Tsegaye,
Liu Xi,
Zai Jiantao,
Li XinHao,
Liu Xuejiao,
Li Wenhao,
Ali Nazakat,
Qian Xuefeng
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201905281
Subject(s) - hydroxide , electrocatalyst , oxygen evolution , heterojunction , electrode , oxygen , catalysis , chemistry , space charge , density functional theory , chemical engineering , materials science , electron , nanotechnology , inorganic chemistry , electrochemistry , physics , optoelectronics , computational chemistry , engineering , biochemistry , quantum mechanics , organic chemistry
The modulation of electron density is an effective option for efficient alternative electrocatalysts. Here, p‐n junctions are constructed in 3D free‐standing FeNi‐LDH/CoP/carbon cloth (CC) electrode (LDH=layered double hydroxide). The positively charged FeNi‐LDH in the space‐charge region can significantly boost oxygen evolution reaction. Therefore, the j at 1.485 V (vs. RHE) of FeNi‐LDH/CoP/CC achieves ca. 10‐fold and ca. 100‐fold increases compared to those of FeNi‐LDH/CC and CoP/CC, respectively. Density functional theory calculation reveals OH − has a stronger trend to adsorb on the surface of FeNi‐LDH side in the p‐n junction compared to individual FeNi‐LDH further verifying the synergistic effect in the p‐n junction. Additionally, it represents excellent activity toward water splitting. The utilization of heterojunctions would open up an entirely new possibility to purposefully regulate the electronic structure of active sites and promote their catalytic activities.