The electrooxidation of 5-hydroxymethylfurfural (HMF)
into 2,5-furandicarboxylic
acid (FDCA) demonstrated its unique superiority, not only in reducing
overpotential and improving energy conversion efficiency for green
hydrogen production but also in utilizing abundant biomass resources
and producing high-value-added chemicals. However, designing highly
efficient electrocatalysts for HMF electrooxidation (HMF-EOR) with
low cost and high performance for large-scale production remained
a huge challenge. Herein, we introduced an easy one-step activation
process to produce P-doped porous biochar loaded with multiple crystal
surfaces exposed to CoP2O6 catalysts (CoP2O6@PC), which exhibited outstanding electrooxidation
performance. To achieve a current density of 50 mA cm–2, only a low overpotential of 200 mV was needed for the electrooxidation
of HMF in 1.0 M KOH + 10 mM HMF. This performance far surpassed that
of other similar materials. CoP2O6@PC exhibited
outstanding HMF-EOR performance with high conversion (nearly 100%),
selectivity (97.1%), faradaic efficiency (95.3%), and robust stability.
This work represents a promising strategy to fabricate macroscale
and low-cost HMF-EOR electrocatalysts and achieve potential industrial
applications of HMF-EOR.