Integrating Rh Species with NiFe-Layered Double Hydroxide for Overall Water Splitting | Zendy

Bowei Zhang | Zendy; Chongqin Zhu | Zendy; Zishan Wu | Zendy; Eli Stavitski | Zendy; Yu Hui Lui | Zendy; TaeHoon Kim | Zendy; Huan Liu | Zendy; Ling Huang | Zendy; Xuechen Luan | Zendy; Lin Zhou | Zendy; Kun Jiang | Zendy; Wenyu Huang | Zendy; Shan Hu | Zendy; Hailiang Wang | Zendy; Joseph S. Francisco | Zendy

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Integrating Rh Species with NiFe-Layered Double Hydroxide for Overall Water Splitting

Author(s) -

Bowei Zhang,

Chongqin Zhu,

Zishan Wu,

Eli Stavitski,

Yu Hui Lui,

TaeHoon Kim,

Huan Liu,

Ling Huang,

Xuechen Luan,

Lin Zhou,

Kun Jiang,

Wenyu Huang,

Shan Hu,

Hailiang Wang,

Joseph S. Francisco

Publication year - 2019

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.9b03460

Subject(s) - overpotential , hydroxide , bifunctional , oxygen evolution , water splitting , catalysis , alkaline water electrolysis , electrolyte , inorganic chemistry , electrolysis , dopant , electrolysis of water , adsorption , metal , hydrogen , chemistry , materials science , chemical engineering , electrode , electrochemistry , metallurgy , doping , photocatalysis , organic chemistry , optoelectronics , engineering

NiFe-layered double hydroxide (LDH) is thought of as a promising bifunctional water-splitting catalyst, owing to its excellent performances for alkaline oxygen evolution reactions (OERs). However, it shows extremely poor activity toward hydrogen evolution reactions (HERs) due to the weak hydrogen adsorption. We demonstrated that the integration of Rh species and NiFe-LDH can dramatically improve its HER kinetics without sacrificing the OER performance. The Rh species were initially integrated into NiFe-LDH as oxidized dopants and metallic clusters (< 1 nm). In 1 M KOH electrolyte, an overpotential of 58 mV is needed to catalyze 10 mA cm -2 HER current density. Furthermore, this catalyst only requires 1.46 V to drive an electrolyzer at 10 mA cm -2 . A strong interaction between metallic Rh clusters and NiFe hydroxide during the HER process is revealed. The theoretical calculation shows the Rh ions replace Fe ions as the major active sites that are responsible for OERs.

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