Rational Assembly of Hierarchically Porous Co_xFe_1–xS₂@Carbon Superparticles for Efficient Hydrogen Evolution

Electrochemical water splitting is a highly promising strategy to produce high purity hydrogen. To reduce costs, it is critical to develop non-precious-metal catalysts displaying high catalytic activity toward the hydrogen evolution reaction (HER). Here, we develop a flexible approach to synthesize hierarchically porous Co_xFe_1–xS₂@carbon (x ≈ 0.36) superparticles with mesopores, macropores, and carbon shell structures. Co_xFe_1–xS₂@carbon superparticles exhibited excellent HER activity and catalytic stability.