Microwave-assisted synthesis of ZIF-9@xGO composites as cooperative electrocatalysts for electro-oxidation of benzyl alcohols coupled with H2 production
Literature Information
Sayantan Chongdar, Anirban Ghosh, Asim Bhaumik
Selective electrochemical oxidation of alcohols to their corresponding aldehydes or acids utilizing water as the oxygen source is not only considered a green and sustainable approach to synthesize value added chemicals but also economically demanding as the overall process is coupled with green H2 production. However, restricted production due to low current density and the use of expensive noble-metal-based electrocatalysts has limited its industrial viability. On the other hand microwave-assisted synthesis enables a rapid, economical and effective way to fabricate various advanced porous materials. In this regard, herein we report microwave assisted rapid synthesis of a metal–organic framework materials ZIF-9 nanocrystals and ZIF-9@xGO composites by varying the wt% of graphene oxide (GO). Remarkably, upon GO loading the current density increases significantly from 75 mA cm−2 to 204 mA cm−2 at 1.6 V vs. RHE in an alkaline solution with 0.1 M benzyl alcohol, thereby imparting direct impact towards benzoic acid yield (∼84%) and faradaic efficiency (∼88%) of the process. Moreover, the optimised electrocatalyst (i.e. ZIF-9@10GO) exhibits a H2 evolution rate of 273 mmol g−1 h−1 in the presence of benzyl alcohol. Our results indicate that in situ generated Co(OH)2/CoOOH hybrid species over the ZIF-9 surface plays an active role in this electrocatalysis. Additionally, this electrocatalytic system shows good functional group tolerance, exhibiting wide scope for different substrates with high faradaic efficiency.
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