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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

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Front Mater Sci    2012, Vol. 6 Issue (2) : 142-148    https://doi.org/10.1007/s11706-012-0162-8
RESEARCH ARTICLE
Cobalt-based layered double hydroxides as oxygen evolving electrocatalysts in neutral eletrolyte
Hong LIN1(), Ye ZHANG1, Gang WANG2, Jian-Bao LI1,3
1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. College of Chemical Engineering, Qinghai University, Xining 810016, China; 3. Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources, College of Materials Science and Chemical Engineering, Hainan University, Haikou 570228, China
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Abstract

Co–M (M= Co, Ni, Fe, Mn) layered double hydroxides (LDHs) were successfully fabricated by a hexamethylenetetramine (HMT) pyrolysis method. Composite electrodes were made using a self-assembly fashion at inorganic/organic surface binder-free and were used to catalyze oxygen evolution reaction. Water oxidation can take place in neutral electrolyte operating with modest overpotential. The doping of other transitional metal cations affords mix valences and thus more intimate electronic interactions for reversible chemisorption of dioxygen molecules. The application of employing LDH materials in water oxidation process bodes well to facilitate future hydrogen utilization.
Keywords layered double hydroxide (LDH)      oxygen evolution reaction      neutral      cobalt catalyst     
Corresponding Author(s): LIN Hong,Email:hong-lin@tsinghua.edu.cn   
Issue Date: 05 June 2012
 Cite this article:   
Hong LIN,Ye ZHANG,Gang WANG, et al. Cobalt-based layered double hydroxides as oxygen evolving electrocatalysts in neutral eletrolyte[J]. Front Mater Sci, 2012, 6(2): 142-148.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-012-0162-8
https://academic.hep.com.cn/foms/EN/Y2012/V6/I2/142
Fig.1  XRD patterns of the Co-based LDH powder samples.
Fig.2  TEM image of Co–Ni LDH platelets. HRTEM images of Co–Ni LDH platelets and Co–Co LDH platelets (Insert in (c): the corresponding SAED pattern).
Fig.3  Typical SEM images revealing different morphologies of Co–Ni LDH and Co–Fe LDH.
Fig.4  Cyclic voltammograms of the electrodes made by the Co–M LDH platelets at a scan rate of 50 mV·s.
CatalystOER onset/VEa/VEc/VEstimated TOF/(mol·mol-1·s-1)Reference
Co–Ni LDH1.021.130.90.0004This work
Co–Fe LDH1.04–0.30.0001This work
Co–Co LDH1.021.20.850.0003This work
Co–Mn LDH1.251.05-0.00008This work
FTO1.4---This work and Ref. [27]
SBA-15/Co3O4---1140Ref. [15]
Co–Pi1.040.920.730.0007 ( = 410 mV)Ref. [4]
MnO2---0.013 ( = 440 mV)Ref. [28]
[Co4(H2O)2(PW9O34)2]10-1.07--1.2Ref. [26]
Tab.1  Summary of the parameters of the fabricated Co–M LDHs and previous reported catalysts during water oxidation (All measurements were reported against Ag/AgCl)
Fig.5  
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