Work

FeSe2-BiSe2-CoSe2 Ternary Heterojunction for Efficient Hydrogen Evolution Reaction Under pH-Universal

Year: 2026

Type: article

Abstract: The construction of heterostructures has been recognized as an effective strategy for enhancing material activity and stability. Herein, a ternary heterojunction FeSe2-BiSe2-CoSe2 was synthesized via a hydrothermal selenidation reaction. The significant electronegativity difference between Bi and Fe/Co triggers charge transfer within the FeSe2-BiSe2-CoSe2 lattice. Furthermore, the abundant pore structure of FeSe2-BiSe2-CoSe2 provides efficient pathways for electron diffusion, significantly enhancing the HER catalytic kinetics. Results demonstrate that FeSe2-BiSe2-CoSe2 exhibits outstanding HER activity in both acidic and alkaline media. In 0.5 M H2SO4, it exhibits an overpotential of only 44 mV with a Tafel slope of 108 mV dec−1. In 1 M KOH, the corresponding overpotential is 188 mV, with a Tafel slope of 45 mV dec−1 at 10 mA cm−2. This study constructs electron-rich active sites through electronic structure regulation, providing valuable insights for designing low-cost, high-performance transition metal selenide HER catalysts.

Source: Materials

DOI: 10.3390/ma19020430

Authors: Lili Guo, Yang Cui, Qiusheng He, Kankan Liu

Institutions: Taiyuan University of Science and Technology, North University of China

Language: English

Topic: Electrocatalysts for Energy Conversion

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,137