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Synthesis of nickel hydroxide/reduced graphene oxide composite thin films for water splitting application
Author(s) -
Babar Pravin T.,
Pawar Bharati S.,
Ahmed Abu Talha Aqueel,
Sekar Sankar,
Lee Sejoon,
Sankapal Babasaheb R.,
Im Hyunsik,
Kim Jin Hyeok,
Pawar Sambhaji M.
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5627
Subject(s) - tafel equation , overpotential , graphene , materials science , oxygen evolution , electrocatalyst , chemical engineering , nickel , oxide , composite number , hydroxide , water splitting , electrode , electrochemistry , dip coating , hydrogen production , amorphous solid , coating , catalysis , nanotechnology , composite material , metallurgy , chemistry , organic chemistry , photocatalysis , engineering
Summary Facile synthesis of highly efficient and low‐cost electrocatalyst for oxygen evolution reaction (OER) is important for large‐scale hydrogen production. Herein, nickel hydroxide/reduced graphene oxide (Ni(OH) 2 /rGO) composite thin film was fabricated using dip‐coating followed by electrodeposition method on Ni foam substrate at room temperature. The deposited composite film shows amorphous nature with ultra‐thin Ni(OH) 2 nanosheets vertically coated on rGO surface, which provides large electrochemical surface area and abundant catalytically active sites. It exhibits a low overpotential of 260 mV @10 mA cm −2 as compared to the pristine electrodes and excellent long‐term stability up to 20 hours in 1 M KOH solution. The electrochemical active surface area and Tafel slope of the composite electrode are 20.2 mF cm −2 and 35 mV dec −1 , respectively. The superior water oxidation performance is a result of high catalytically active sites and improved conductivity of the composite electrode.