FeCoNiB@Boron-doped vertically aligned graphene arrays: A self-supported electrocatalyst for overall water splitting in a wide pH range

•A novel strategy has designed for the fabrication of efficient self-supported bifunctional electrocatalysts consist of vertically aligned boron doped graphene (B-VG) integrated with different compositions of iron-based metal borides nanoparticles (IMBs@B-VG) for overall water splitting.•Ternary iro...

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Bibliographic Details
Published in:Electrochimica acta 2021-08, Vol.386, p.138459, Article 138459
Main Authors: Jiang, Bin, Liang, Keming, Yang, Zujin, Guo, Kaiming, Shaik, Firdoz, Zheng, Jianbin
Format: Article
Language:English
Subjects:
Arrays
Boron-doped
Electrocatalyst
Electrocatalysts
Electroless plating
Electrolytes
FeCoNiB
Graphene
Hydrogen evolution reactions
Nanoalloys
Nanoparticles
Overall water splitting
Oxidation
Oxygen evolution reactions
Sulfuric acid
Technical services
Vertically aligned graphene arrays
Water splitting
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Summary:•A novel strategy has designed for the fabrication of efficient self-supported bifunctional electrocatalysts consist of vertically aligned boron doped graphene (B-VG) integrated with different compositions of iron-based metal borides nanoparticles (IMBs@B-VG) for overall water splitting.•Ternary iron-based metal borides exhibited enhanced catalytic activity compared with monometallic and bimetallic borides.•FeCoNiB@B-VG exhibited excellent electrocatalytic activity for overall water splitting in a wide pH range, especially in alkaline conditions. The development of efficient, cost-effective, bifunctional and self-supported electrocatalysts for overall water splitting in a wide pH range is highly desirable. A novel and highly efficient electrocatalyst for overall water splitting in a wide pH range was synthesized via the electroless plating of FeCoNiB alloy nanoparticles on B-doped vertically aligned graphene arrays (FeCoNiB@B-VG). FeCoNiB@B-VG exhibited excellent electrocatalytic performances with a low overpotential of 31 mV in 1.0 M KOH and 148 mV in 0.5 M H2SO4 for hydrogen evolution reaction (HER), and an overpotential of 387 mV in 1.0 M KOH for oxygen evolution reaction (OER). It also exhibited a quite low Tafel slope value of 30 mV dec−1 and 51 mV dec−1 for HER and OER in 1.0 M KOH respectively. In addition, FeCoNiB@B-VG also exhibited good long-term stabilities in acidic and alkaline electrolytes as a self-supported bifunctional electrocatalyst. This work may provide theoretical and technical support for design of cost-effective bifunctional electrocatalysts for overall water splitting in a wide pH range. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.138459