Figure 28.

Schematic illustration of the synthesis of trimetallic clusters. (a) Space-filling representation of the structure of polyoxometalates (POMs). (b) Self-assembly of POMs and ethylenediamine-grafted C₆₀ (EDA-C₆₀) driven by electrostatic interactions. (c) Schematic structure of the POMs/EDA-C₆₀ composites after freeze-drying. (d) Trimetallic clusters on a carbonic support. O, gray; Co/Fe, violet; W, red; P, yellow. (e) OER polarization curves of BNMP and TMNP catalysts loaded on gold foam (scan rate of 5 mV s^–1 without iR correction). (f) Current density vs time for 3-CoFeW loaded on gold foam for 30 h at a constant applied potential of 1.46 V vs RHE for the OER. Adapted from ref (361). Copyright 2018 American Chemical Society.