(FeSe2 + CoSe2) Nanoparticles Anchored on 3D Porous Ultrathin Carbon Nanosheets for High-Activity Oxygen Evolution Reaction

作者：Li, Hui; Xie, Haonan; Wang, Xixi; Liu, Enzuo; Kang, Jianli; Shi, Chunsheng; Sha, Junwei; Ma, Liying^*

来源：ACS Applied Nano Materials, 2023, 6(11): 9598-9607.

DOI：10.1021/acsanm.3c01262

• oxygen evolution reaction
• (FeSe2 + CoSe2)
• ultrafine nanoparticles
• 3D porous ultrathincarbon nanosheets
• high active sites

Since the sluggish kinetics of the oxygen evolution process(OER)at the anode of water splitting remains to be a crucial bottleneckfor hydrogen production, it is imperative to develop low-cost OERelectrocatalysts with high efficiency. Here, (FeSe2 + CoSe2) nanoparticles loaded on nitrogen-doped three-dimensionalporous carbon nanosheets (referred to as (FeSe2 + CoSe2)/N-3DCN) were prepared by freeze-drying, heat treatment andselenization. The favorable affinity and large surface area of N-3DCNenabled the synthesis of the ultrafine (FeSe2 + CoSe2) nanoparticles with a diameter of 10 nm, which were highlydispersed on carbon nanosheets and provided a significant number ofactive sites. The density functional theory (DFT) calculation demonstratedthat the free energy of oxygen-containing intermediates during OERwas optimized by coupling FeSe2 with CoSe2.The overpotential of (FeSe2 + CoSe2)/N-3DCNis 312 mV at 10 mA cm(-2), which is superior to thoseof (FeSe2 + CoSe2) (390 mV), CoSe2/N-3DCN (377 mV), RuO2 (320 mV), and FeSe2/N-3DCN(479 mV). Additionally, after the 80 h stability test, the overpotentialof (FeSe2 + CoSe2)/N-3DCN can still be maintainedat 316 mV.

• 单位
  天津大学