Polyoxometalates Decorated Gheraphene Nanosheets and Carbon Nanotubes, Effective Electrocatalysts for Hydrogen Evolution Reaction, 361. Ali A. Ensafi, E. Heydari-Soureshjani, M. Jafari-Asl, B. Rezaei, , Carbon, 2016, 99, 398-406.
The present study is an attempt to prepare new nanocomposites based on Pt-modiﬁed [PW11NiO39] 5 @reduced graphene oxide (rGO) and Pt-modiﬁed [PW11NiO39] 5 @multiwall carbon nanotubes (CNT). For this purpose, poly diallyldimethylammonium chloride (PDDA) modiﬁed-rGO and PDDA-CNT are prepared, the surfaces of which are then decorated with polyoxometalate ([PW11NiO39] 5 ). Finally, [PW11NiO39] 5 @PDDA-rGO and [PW11NiO39] 5 @PDDA-CNT are decorated with platinum nanoparticles to fabricate [PW11Pt e NiO39] @PDDA-CNT/GCE and [PW11Pt e NiO39] e @PDDA-rGO/GCE. The amounts of the noble metal required for the modiﬁcation of the electrodes is reduced by using the replacement reaction, as a simple and effective method. Polarization measurement, cyclic voltammetry and electrochemical impedance spectroscopy are used to investigate the electrochemical properties of [PW11Pt e NiO39] @PDDA-rGO and [PW11Pt e Nio] @PDDA-CNT in a solution of 0.5 mol L1 H2SO4. The nanocomposites are then characterized in detail using scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction pattern, Brunauer e Emmett e Teller surface area analysis and infrared spectroscopy. It is found that the nanocomposites exhibit a high catalytic activity for hydrogen evolution reaction with low overpotentials,high current densities and long-term stability.