Mn-doped Co-Al LDHs and its Potential Use for Overall Water Splitting

doi:10.11901/1005.3093.2021.258

Chinese Journal of Materials Research

2022, Vol. 36

Issue (2): 140-146 DOI: 10.11901/1005.3093.2021.258

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Mn-doped Co-Al LDHs and its Potential Use for Overall Water Splitting

JI Jinpeng¹, LI Guohui¹^,²(

), GENG Fengxia¹

^1.College of Energy, Soochow University, Suzhou 215123, China
^2.School of Chemistry and Chemical Engineering, Zunyi Normal University, Zunyi 563006, China

Cite this article:

JI Jinpeng, LI Guohui, GENG Fengxia. Mn-doped Co-Al LDHs and its Potential Use for Overall Water Splitting. Chinese Journal of Materials Research, 2022, 36(2): 140-146.

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Abstract

The layered double-metal Co-Al hydroxide (CoAl LDH) was first prepared via reflux precipitation method with CoCl₂·6H₂O and AlCl₃·6H₂O as raw material, and then the heteroelement Mn doped layered double-metal Co-Al hydroxide (Mn-CoAl LDH) was acquired by the same means. When the current density reaches 10 mA·cm^-2, the fully hydrolyzable potential of Mn-CoAl LDH in 1 mol/L KOH alkaline electrolyte is 1.66 V, its performance is much better than that of undoped Co-Al layered bimetallic hydroxide (CoAl LDH), Ni_2/3S_1/3 /Nickel Foam (1.76 V) and commercial Pt/C (1.75 V). These results show that Mn-CoAl LDH catalyst has high activity of hydrogen evolution and oxygen evolution in alkaline environment, and is a kind of low cost and high performance bifunctional electric catalyst

Key words: inorganic non-metallic materials catalyst Mn doping hydrogen production oxygen evolution

Received: 21 April 2021

ZTFLH:

TQ116.2

Fund: National Natural Science Foundation of China(51772201);Key Laboratory of Materials Electrochemistry of Guizhou Province(KY2018004);Specialized Research Fund for the Doctoral Program of Higher Education(202013)

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	Jinpeng JI
	Guohui LI
	Fengxia GENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.258 OR https://www.cjmr.org/EN/Y2022/V36/I2/140

Fig.1 XRD patterns of CoAl LDH and Mn-CoAl LDH

Fig.2 SEM images of CoAl LDH

Fig.3 SEM images of Mn-CoAl LDH

Table 1 Atomic ratio of metal component in the sample

Fig.4 SEM images of Mn-CoAl LDH (a) and EDX mapping (Total, O, Al, Mn, Co) of Mn-CoAl LDH (b~f)

Fig.5 HER catalytic performance of Mn-CoAl LDH in 1 mol/L aqueous KOH electrolyte

Fig.6 OER catalytic performance of Mn-CoAl LDH in 1 mol/L aqueous KOH electrolyte

Fig.7 Cyclic voltammetry curves at different sweeping speeds from 2 to10 mV·s^-1 (a) CoAl LDH, (b) Mn-CoAl LDH and (c) the linear fitting line between the difference value of current density and sweep speed at the median value of CV voltage window, in which the slope of the fitting line represents the double-layer capacitance of the material

Fig.8 Polarization curves of overall water splitting for Mn-CoAl LDH electrode compared with CoAl LDH at a rate of 5 mV·s^-1 in 1.0 M aqueous KOH (a) and the constant current curve at the current density of 10 mA·cm^-2 (b)

Table 2 Comparison of catalytic activity toward overall water splitting in a two-electrode cell with some representative non-noble catalysts

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