Ultralow Pt0 loading on MIL-88A(Fe) derived polyoxometalate-Fe3O4@C micro-rods with highly-efficient electrocatalytic hydrogen evolution

• Published in: Journal of coordination chemistry 2020-09, Vol.73 (17-19), p.2422-2436
• Main Authors: Wang, Ming-Liang, Yin, Di, Cao, Yun-Dong, Gao, Guang-Gang, Pang, Tao, Ma, Lulu, Liu, Hong
• Format: Article
• Language: English
• Subjects: Catalysts; Chemical synthesis; Coordination compounds; Electrocatalysts; Functional materials; hierarchical; hydrogen evolution reaction; Hydrogen evolution reactions; Hydrogen production; Iron oxides; metal-organic frameworks; Nanoparticles; Polyoxometalate; Polyoxometallates; Pt nanoparticles; Rods; Synergistic effect
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958972.2020.1809656

Synthesis of catalysts with high activity for hydrogen evolution reaction (HER) has been a hot topic in electrocatalysis. In this paper, using MIL-88A(Fe) metal-organic complex, polyoxometalate (POM) and H 2 PtCl 6 as starting materials, hierarchic and low Pt 0 -loading micro-rods (denoted as Pt-POMFe, i.e. Pt-PW 12 Fe or Pt-PMo 12 Fe) have been synthesized, in which the Pt 0 nanoparticles can be stabilized by POM. The Pt-PW 12 Fe micro-rod containing [PW 12 O 40 ] 3- polyoxoanion component (0.30% Pt 0 -loading) which retains the spindle structure of its parent MIL-88A(Fe) exhibits a low overpotential of 28 mV at current density of 10 mA·cm −2 for HER that is close to the electrocatalytic effect of commercial Pt/C (ca. 20% Pt 0 -loading). Such high electrocatalytic reactivity is mainly caused by the synergistic effect of the three components of POM, Pt 0 , and Fe 3 O 4 @C. The structure effectively increases the active sites of the catalyst and improves its conductivity and stability. The Pt-POMFe catalyst extends a new family of MOF-POM functional materials and provides a new concept to the design and synthesis of highly-efficient and low-cost electrocatalyst for hydrogen production.