1P-409 Hierarchical structure of few-layers Ni_xP_y nanoparticles as highly efficient electrocatalyst for hydrogen evolution reaction = 1P-409 Hierarchical structure of few-layers Ni_xP_y nanoparticles as highly efficient electrocatalyst for hydrogen evolution reaction

다국어 초록 (Multilingual Abstract)

Highly active Ni_xP_y catalysts for HER are prepared using modified thermal decomposition method. In this process, nickel oxide (NiO) powder reduced to Ni_xP_y by phosphine gas (PH₃) produced from sodium hypophosphite (NaH₂PO₂). Unlike conventional method, NiO is phosphidized from bi-located P source (NaH₂PO₂). Synthesized Ni_xP_y catalysts had multi-phase crystalline structure (Ni₂P, Ni₅P₄ and NiP₂) and the Ni_xP_y with higher P content exhibited the smaller crystallite size. (Ni_2P＜50, _Ni5P₄~10, NiP₂~2 nm). Consequently, Ni₅P₄ and NiP₂ nanoparticles with higher HER activity are supported on micro-scaled Ni₂P with better conductivity. The Ni_xP_y catalysts showed exceptionally higher HER activity in acidic media than single-phased Ni₂P or Ni₅P₄. Therefore, modified phosphidation method and hierarchical structure of Ni_xP_y catalyst provide new instruction for designing excellent HER catalysts.