Polyoxometalate-decorated graphene nanosheets and carbon nanotubes, powerful electrocatalysts for hydrogen evolution reaction

Synergistic amplification of catalytic hydrogen generation by a thin-film conducting polymer composite

“…The nano-Ni/rGO and PEDOT/nano-Ni/rGO samples (with and without illumination) were, however, dominated by processes at intermediate frequencies (10 1-1.5 Hz), which are more typical of interfacial and solution catalytic charge transfer processes, like adsorption. 57 High frequency components at 10 3-4 Hz were not observed (Figure 8(a) inset). It can be concluded that catalytic hydrogen generation by nano-Ni/rGO and PEDOT/nano-Ni/rGO (with and without light illumination) was kinetically controlled and involved the same catalytic sites.…”

“…Accordingly, we modelled the EIS data using the equivalent circuit depicted in Figure 8(b), as used previously. [57][58][59][60][61][62][63] The modelled data is shown as the solid lines in Figure 8(a). As can be seen, there is an excellent match between the measured data and the modelled data.…”

POM & MOF‐based Electrocatalysts for Energy‐related Reactions

“…[117,118] The first report involved the decoration of polydiallyldimethylammonium multiwalled carbon nanotubes (PDDA-CNT)a nd PDDA-reduced graphene oxide (PDDA-rGO) with [PW 11 NiO 39 ] 5À .T hen, the [PW 11 Pt-NiO 39 ]@PDDA-CNT and [PW 11 Pt-NiO 39 ]@PDDA-rGO were obtained through the decoration with Pt nanoclusters. [118] The electrocatalysts showed h 10 = À0.034 Va nd À0.054 Vv s. RHE and TSs of 60 and 65 mV dec À1 forthe first and second composite, respectively.T he good HER activities were attributed to the Pt loading as the corresponding nanocomposites without Pt presented poor activity.I nt he last year,t he authors demonstrated the HER properties of [PW 11 MO 39 ]@Ru-rGO (M = Co, Ni, Cu) composites in both acidic and alkaline media. [117] Results showedt hat, in alkaline medium (2.0 mol dm À3 KOH),t he HER activity increased in the order Cu < Ni < Co which was due to the presence of more unpairedo rbitals of Co.…”

“…Enfasi and co‐workers have also reported the HER electrocatalytic properties of different Keggin‐type POMs immobilized onto rGO and CNT . The first report involved the decoration of polydiallyldimethylammonium multiwalled carbon nanotubes (PDDA‐CNT) and PDDA‐reduced graphene oxide (PDDA‐rGO) with [PW 11 NiO 39 ] 5− .…”

“…The first report involved the decoration of polydiallyldimethylammonium multiwalled carbon nanotubes (PDDA‐CNT) and PDDA‐reduced graphene oxide (PDDA‐rGO) with [PW 11 NiO 39 ] 5− . Then, the [PW 11 Pt‐NiO 39 ]@PDDA‐CNT and [PW 11 Pt‐NiO 39 ]@PDDA‐rGO were obtained through the decoration with Pt nanoclusters . The electrocatalysts showed η 10 =−0.034 V and −0.054 V vs. RHE and TSs of 60 and 65 mV dec −1 for the first and second composite, respectively.…”