Design of Trimetallic NiMoFe Hollow Microspheres with Polyoxometalate‐Based Metal‐Organic Frameworks for Enhanced Oxygen Evolution Reaction

Abstract

Design of efficient and inexpensive oxygen evolution reaction (OER) catalysts is the key to realizing the wide application of water electrolysis in industrial production. Herein, we synthesized trimetallic hollow microspheres composed with FeNi nanoparticles and nitrogen-doped carbon-based Ni 2 Mo 3 N (Ni-MoFe@NC700) using a "PBA@POMOF" strategy. In order to synthesize the precursor with ideal morphology and structure in the least steps, a polyoxometalate based metal-organic framework (POMOF) is used as a substrate to grow a NiÀ Febased Prussian blue analogue (NiFePBA) on it. Benefiting from the hollow sphere structure formed by stacking flakes, better charge transfer performance and the synergistic effect between Ni 2 Mo 3 N and Fe 0.64 Ni 0.36 , the final product, NiMoFe@NC700, exhibits low overpotentials of 288 and 360 mV to achieve current densities of 10 and 50 mA cm À 2 for OER in 1 M KOH, respectively, which is superior to the benchmark IrO 2 catalyst. This work proposes a facile and effective strategy to synthetize carbon-based polymetallic OER electrocatalysts based on PBA@POMOF.

Elucidating Catalytic Sites Governing the Performance toward the Hydrogen Evolution Reaction in Ternary Nitride Electrocatalysts

“…The mere fact that the synthesis of single-phase Fe x Ni 2– x Mo 3 N ( x = 0–1.25) proceeds without any issues could be because Ni 3 Mo 3 N does not form. ,, Therefore, there was no phase segregation as in the case of Co 2 Mo 3 N due to the formation of Co 3 Mo 3 N. The simplicity of Ni 2 Mo 3 N formation made it a popular choice as an electrocatalyst in alkaline conditions. ,− However, relevant to PEM electrolysis acidic conditions, only a single work reports the electrocatalytic performance of Ni 2 Mo 3 N which reached 10 mA cm –2 at a relatively high overpotential of 320 mV in 0.5 M H 2 SO 4 …”

Magnetic Field‐Enhanced Electrocatalytic Oxygen Evolution on a Mixed‐Valent Cobalt‐Modulated LaCoO3 Catalyst

“…With the energy supply and ecological pressures gradually increasing, searching for clean alternative sustainable energies to replace fossil energy has received significant attention. [1][2][3] Molecular hydrogen (H 2 ) is regarded as a promising alternative fuel owing to its clean, renewable and high energy density nature, which can be availably generated by sustainable electrochemical water splitting route. [4,5] The oxygen evolution reaction (OER) as a critical half-reaction in water electrolysis seriously limits the mass production of H 2 due to the sluggish kinetics arising from the complex multistep four-electron oxidation reaction.…”

“…The massive utilization of traditional fossil fuels accelerates the development of world‐wide economy, but it also led to severe energy crisis and environmental pollution. With the energy supply and ecological pressures gradually increasing, searching for clean alternative sustainable energies to replace fossil energy has received significant attention [1–3] . Molecular hydrogen (H 2 ) is regarded as a promising alternative fuel owing to its clean, renewable and high energy density nature, which can be availably generated by sustainable electrochemical water splitting route [4,5] .…”