ABSTRACT Electrocatalytically hydrogen evolution (HER) offers a promising route for low‐cost hydrogen production; however, most catalysts are powders requiring polymer binders that block active sites. Herein, an eco‐friendly, waste‐derived, binder‐free, self‐supporting CoMo/ME‐ITO/SCG electrode was fabricated via hydrothermal treatment and calcination. The spent coffee grounds (SCG)‐derived carbon framework enhances mechanical robustness, enables uniform dispersion of CoMo species, and improves catalytic activity while promoting sustainability through biomass valorization. Meanwhile, melamine‐derived nitrogen and conductive indium tin oxide (ITO) synergistically regulate the electronic structure and accelerate charge transfer. The formation of Co/Mo 2 C and Mo 2 C/MoC heterojunctions further optimizes hydrogen adsorption and HER kinetics. As a result, the catalyst achieves low overpotentials of 36 (acidic) and 25 mV (alkaline) at 10 mA·cm −2 , outperforming reported biomass‐derived non‐noble metal catalysts. Moreover, the binder‐free structure ensures excellent durability, retaining high activity after 1000 CV cycles. This work presents a green, low‐cost strategy for advanced self‐supporting HER electrodes.
Liu et al. (Fri,) studied this question.