Abstract
Electrocatalytic oxygen reduction reaction (ORR) provides an attractive alternative to anthraquinone process for H
2
O
2
synthesis. Rational design of earth-abundant electrocatalysts for H
2
O
2
synthesis via a two-electron ORR process in acids is attractive but still very challenging. In this work, we report that nitrogen-doped carbon nanotubes as a multi-functional support for CoSe
2
nanoparticles not only keep CoSe
2
nanoparticles well dispersed but alter the crystal structure, which in turn improves the overall catalytic behaviors and thereby renders high O
2
-to-H
2
O
2
conversion efficiency. In 0.1 M HClO
4
, such CoSe
2
@NCNTs hybrid delivers a high H
2
O
2
selectivity of 93.2% and a large H
2
O
2
yield rate of 172 ppm·h
−1
with excellent durability up to 24 h. Moreover, CoSe
2
@NCNTs performs effectively for organic dye degradation via electro-Fenton process.