Layered double hydroxide-based core-shell nanoarrays for efficient electrochemical water splitting

doi:10.1007/s11705-018-1719-6

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (3) : 537-554 https://doi.org/10.1007/s11705-018-1719-6

REVIEW ARTICLE

Layered double hydroxide-based core-shell nanoarrays for efficient electrochemical water splitting

Wenfu Xie, Zhenhua Li, Mingfei Shao(

), Min Wei

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

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Abstract

Electrochemical water splitting is an efficient and clean strategy to produce sustainable energy productions (especially hydrogen) from earth-abundant water. Recently, layered double hydroxide (LDH)-based materials have gained increasing attentions as promising electrocatalysts for water splitting. Designing LDHs into hierarchical architectures (e.g., core-shell nanoarrays) is one of the most promising strategies to improve their electrocatalytic performances, owing to the abundant exposure of active sites. This review mainly focuses on recent progress on the synthesis of hierarchical LDH-based core-shell nanoarrays as high performance electrocatalysts for electrochemical water splitting. By classifying different nanostructured materials combined with LDHs, a number of LDH-based core-shell nanoarrays have been developed and their synthesis strategies, structural characters and electrochemical performances are rationally described. Moreover, further developments and challenges in developing promising electrocatalysts based on hierarchical nanostructured LDHs are covered from the viewpoint of fundamental research and practical applications.

Keywords layered double hydroxides (LDHs) core-shell nanoarrays oxygen evolution reaction (OER) hydrogen evolution reaction (HER) photoelectrochemical water splitting (PEC)

Corresponding Author(s): Mingfei Shao

Just Accepted Date: 05 March 2018 Issue Date: 18 September 2018

Cite this article:

Wenfu Xie,Zhenhua Li,Mingfei Shao, et al. Layered double hydroxide-based core-shell nanoarrays for efficient electrochemical water splitting[J]. Front. Chem. Sci. Eng., 2018, 12(3): 537-554.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1719-6
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I3/537

Fig.1 (a) Schematic illustration of fabricating self-standing 3D core-shell Cu@NiFe-LDH electrocatalyst; (b) SEM and (c) TEM images of Cu@NiFe-LDH; (d) OER and (e) HER performances for Cu@NiFe-LDH in 1.0 mol?L^?¹KOH (Reprinted from Ref. [⁷⁸], with permission from Royal Society of Chemistry)

Fig.2 (a) Schematic illustration for the construction of NiCo₂O₄@NiFe-LDH nanoarray; (b) SEM image of NiCo₂O₄@NiFe-LDH nanoarray (reprinted from Ref. [⁸⁸], with permission from American Chemical Society); (c) schematic illustration for the formation process of NiCo₂O₄@NiFe-LDH nanoarray; (d) SEM image of NiCo₂O₄@NiFe-LDH nanoarray; (e) OER and (f) HER polarization curves conducted in 1.0 mol?L^?¹ KOH (Reprinted from Ref. [⁸⁹], with permission from Wiley)

Fig.3 (a) Preparation Procedure for NiCo₂O₄@FeCoNi-LDH nanoarray; (b) SEM and (c) TEM images of NiCo₂O₄@FeCoNi-LDH nanoarray; (d) OER and (e) HER polarization curves conducted in 1.0 mol?L^?¹ KOH (Reprinted from Ref. [⁹⁸], with permission from American Chemical Society); (f) schematic illustration of the hierarchical Co(OH)₂@NiCoFe-LDH nanoarray; (g) SEM image of the hierarchical Co(OH)₂@NiCoFe-LDH nanoarray; (h) OER polarization curves conducted in 1.0 mol?L^?¹ KOH (Reprinted from Ref. [⁹⁹], with permission from Royal Society of Chemistry)

Fig.4 (a) Schematic illustration for the fabrication of TiO₂@ZnFe-LDH; (b) SEM images of TiO₂@ZnFe-LDH (reprinted from Ref [¹⁰⁴], with permission from Elsevier); (c) schematic illustration for the fabrication of TiO₂/rGO@NiFe-LDH; (d) SEM image of TiO₂/rGO@NiFe-LDH; (e) current-voltage (J-V) curves; (f) calculated photoconversion efficiency as a function of applied voltage (Reprinted from Ref. [¹⁰⁵], with permission from Royal Society of Chemistry)

Fig.5 (a) Schematic illustration for the synthesis process of NiCo₂S₄@NiFe-LDH; (b) adsorption geometries of the intermediates *H and *OH on the surfaces of NiFe-LDH and NiCo₂S₄@NiFe-LDH, and interfacial electron transfers between NiCo₂S₄ and NiFe-LDH. Reprinted from Ref. [¹²⁰], with permission from American Chemical Society; (c) schematic illustration for the synthesis of Ni₃S₂@NiFe-LDH; SEM images of (d) Ni₃S₂ and (e) Ni₃S₂@NiFe-LDH; (f) OER polarization curves conducted in 1.0 mol?L^?¹ KOH (Reprinted from Ref. [¹²¹], with permission from Wiley)

Fig.6 (a) Synthetic strategy to prepare NiSe@NiFe-LDH; (b) OER polarization curves conducted in 1.0 mol?L^?¹ KOH (reprinted from Ref. [¹²²], with permission from American Chemical Society); (c) schematic illustration of designing (Ni,Co)_0.85Se and (Ni,Co)_0.85Se@NiCo-LDH; (d) SEM and (e) TEM of (Ni, Co)_0.85Se@NiCo-LDH; (f) OER polarization curves conducted in 1.0 mol?L^?¹ KOH and (g) the corresponding Tafel plots (Reprinted from Ref. [¹²³], with permission from Wiley)

Fig.7 SEM images of (a) NiFe-LDH and (b) NiFe-LDH@NiFeB; (c) OER polarization curves conducted in 0.1 mol?L^?¹ K-B_i and (d) the corresponding Tafel plots (reprinted from Ref. [¹²⁸], with permission from American Chemical Society); SEM images of (e) CoFe-LDH and (f) CoFe-LDH@CoFeB; (g) OER polarization curves conducted in 0.1 mol?L^?¹ K-B_i and (h) the corresponding Tafel plots (Reprinted from Ref. [¹²⁹], with permission from American Chemical Society)

Fig.8 (a) Schematic illustration for the formation of CNTs@NiCo-LDH; (b) SEM and (c) TEM image of CNTs@NiCo-LDH; (d) OER polarization curves conducted in 1.0 mol?L^?¹ KOH (reprinted from Ref. [¹⁵²], with permission from American Chemical Society); (e) illustration of the fabrication procedure for HPGC@NiFe-LDH; (f) SEM image of HPGC@NiFe-LDH; (g) OER polarization curves conducted in 1.0 mol?L^?¹ KOH (Reprinted from Ref. [¹⁴⁵], with permission from Royal Society of Chemistry)

Tab.1 Comparison studies for various LDH-based core-shell nanoarrays and their OER/HER performances

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