Design and application of a polyoxometalate-ionic liquid-graphene oxide hybrid nanomaterial: New electrocatalyst for water oxidation

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2022-01, Vol.632, p.127812, Article 127812
• Main Authors: Shahsavarifar, Samaneh, Masteri-Farahani, Majid, Ganjali, Mohammad Reza
• Format: Article
• Language: English
• Subjects: Electrocatalyst; Graphene oxide; Ionic liquid; Polyoxometalate; Water oxidation
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2021.127812

Design of a new hybrid nanomaterial, CoW12−IL−GO, is reported for utilization as an electrocatalyst for water oxidation reaction for oxygen evolution at neutral pH conditions. The desired electrocatalyst was prepared by covalent attachment of ionic liquid (IL) species to graphene oxide for preparing IL−GO and then electrostatic interaction of supported imidazolium cations with Keggin type [CoW12O40]6- polyanions. After confirming the construction of CoW12−IL−GO with different physicochemical techniques, its electrochemical properties was evaluated. The CoW12 −IL−GO exhibited a low onset potential of 1.3 V vs. NHE and low overpotential of 269 mV at 10 mA.cm−2 with a low Tafel slope of 92 mV.dec−1 at neutral pH. Eventually, the electrocatalytic activity of prepared CoW12−IL−GO was studied in water oxidation reaction which revealed its outstanding stability over 14 h and retention of catalytic activity even after 900 catalytic cycles. Design f a new hybrid nanomaterial is reported for utilization as an electrocatalyst for water oxidation reaction. The prepared hybrid nanomaterial was based on the interaction of polyoxometalate and graphene oxide. The prepared hybrid nanomaterial exhibited high efficiency in water oxidation for a prolonged−time span in neutral pH. [Display omitted] •Design of a new hybrid nanomaterial is reported for utilization as an electrocatalyst for water oxidation reaction.•The hybrid nanomaterial was based on the interaction of polyoxometalate and ionic liquid modified reduced graphene oxide.•The prepared hybrid nanomaterial exhibited high efficiency in water oxidation for a prolonged-time span in neutral pH.