Sub-3-nm High-Entropy Metal Sulfide Nanoparticles with Synergistic Effects as Promising Electrocatalysts for Enhanced Oxygen Evolution Reaction
Fengqi Li, Yujie Ma, Hao Wu, Qingxi Zhai, Jingyuan Zhao, Hurong Ji, Shaochun Tang, Xiangkang Meng
Abstract
Both high-entropy materials and metal–organic frameworks (MOFs) can be used as efficient catalysts for oxygen evolution, but it remains a challenge to combine their advantages to further improve the oxygen evolution reaction (OER). Herein, MOFs are served as precursors to prepare the high-entropy metal sulfide (HEMS) (MnFeCoNiCu)S2 nanoparticles based on the maximized configurational entropy theory, exhibiting ultra-efficient OER performance. The strong synergistic effect among Mn, Fe, Co, Ni, and Cu builds a stable electronic structure and provides a favorable local coordination environment, which enhance the catalytic performance greatly. In addition, the appropriate doping of sulfur source contributes to modulate the electronic structure, which promotes the formation of single-phase HEMS nanoparticles with the dimeter of sub-3 nm. The (MnFeCoNiCu)S2 nanoparticles display the best OER performance (a low overpotential of 221 mV at 10 mA cm–2 in 1 M KOH solution) and good stability (remains to be 97.6% after 12 h by chronoamperometry). This work provides a potential application for high-entropy materials based on MOF precursors as OER catalysts.