CoO-Co Heterojunction Covered with Carbon Enables Highly Efficient Integration of Hydrogen Evolution and 5-Hydroxymethylfurfural Oxidation

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2023 Apr 13

PMID 37049803

Authors

Lei Zhao

Shichao Du

Rui Gong

Wanqi Jia

Zhimin Chen

Zhiyu Ren

Affiliations

Soon will be listed here.

Abstract

The renewable-energy-driven integration of hydrogen production and biomass conversion into value-added products is desirable for the current global energy transition, but still a challenge. Herein, carbon-coated CoO-Co heterojunction arrays were built on copper foam (CoO-Co@C/CF) by the carbothermal reduction to catalyze the hydrogen evolution reaction (HER) coupled with a 5-hydroxymethylfurfural electrooxidation reaction (HMFEOR). The electronic modulation induced by the CoO-Co heterojunction endows CoO-Co@C/CF with a powerful catalytic ability. CoO-Co@C/CF is energetic for HER, yielding an overpotential of 69 mV at 10 mA·cm and Tafel slope of 58 mV·dec. Meanwhile, CoO-Co@C/CF delivers an excellent electrochemical activity for the selective conversion from HMF into 2,5-furandicarboxylic acid (FDCA), achieving a conversion of 100%, FDCA yield of 99.4% and faradaic efficiency of 99.4% at the lower oxidation potential, along with an excellent cycling stability. The integrated CoO-Co@C/CF||CoO-Co@C/CF configuration actualizes the HO-HMF-coupled electrolysis at a satisfactory cell voltage of 1.448 V at 10 mA·cm. This work highlights the feasibility of engineering double active sites for the coupled electrolytic system.

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