3 years ago

Boosting Electrocatalytic Activity of Binary Ag-Fe-doped Co2P Nanospheres as Bifunctional Electrocatalysts for Overall Water Splitting

Boosting Electrocatalytic Activity of Binary Ag-Fe-doped Co2P Nanospheres as Bifunctional Electrocatalysts for Overall Water Splitting
The binary Ag-Fe-doped Co2P (Ag-Fe-Co2P) nanospheres have been prepared as bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) using Ag-Fe-Co hydroxides nanospheres as precursors. XRD and XPS confirm the formation of Ag-Fe-Co2P. SEM and TEM demonstrate that Ag-Fe-Co2P has uniform nanospherical morphology composed of vertical nanosheets, which imply the more exposed active sites for water splitting. For HER measurements in 1M KOH, Ag-Fe-Co2P with the overpotential of only 41mV to drive current density of 10mAcm−2. Remarkably, to achieve current density of 100mAcm−2 for OER, Ag-Fe-Co2P requires overpotential of 220mV, which is obviously less than that of Fe-Co2P. Furtherly, when Ag-Fe-Co2P was used as the electrocatalyst for both cathode and anodic, a cell voltage of 1.53V was able to reach 100mAcm−2 in 1.0M KOH, outperforming most reported nonprecious electrocatalysts. The obvious enhancement in activity of Ag-Fe-Co2P for HER and OER derived from its high conductivity, electron-donating ability and augmented accessibility of active sites. Therefore, designing multiple metal doped transition metal phosphides with unique nanostructure may be a promising way for efficient overall water splitting.

Publisher URL: www.sciencedirect.com/science

DOI: S0013468617316213

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