Intermetallic PdZn nanoparticles loaded on deficient TiO₂ nanosheets as a support: a bifunctional electrocatalyst for oxygen reduction in PEMFCs and the glycerol oxidation reactions

Abstract

Exploring simple and flexible methods to synthesize oxygen reduction reaction (ORR) catalyst with high catalytic activity is of great significance for the large-scale application of fuel cells. Here we developed...

Bifunctional intermetallic PdZn nanoparticle-loaded deficient TiO2 nanosheet electrocatalyst for electrochemical water splitting

“…Electrochemically active surface area (ECSA) of palladium cannot be accurately obtained through the redox of adsorbed atomic hydrogen due to the hydrogen absorption in palladium. 29 Therefore, the ECSA of Pd-based catalysts is determined by using the charge ( Q R ) required for the reduction of the surface oxide, PdO, and using the next relation, 29 ECSA = Q R / Q ref where Q ref is the theoretical charge (424 μC cm −2 ) for the reduction of the PdO monolayer. 29…”

“…29 Therefore, the ECSA of Pd-based catalysts is determined by using the charge ( Q R ) required for the reduction of the surface oxide, PdO, and using the next relation, 29 ECSA = Q R / Q ref where Q ref is the theoretical charge (424 μC cm −2 ) for the reduction of the PdO monolayer. 29…”

“…Electrochemical active surface area (ECSA) of palladium cannot be accurately obtained through the redox of adsorbed atomic hydrogen due to the hydrogen absorption in the palladium. 29 Therefore, the ECSA of Pd-based catalysts are determined by using the charge (QR) required for the reduction of the surface oxide, PdO, and using the next relation, 29 ECSA = QR/Qref (1) where Qref is a theoretical charge (424 µC cm -2 ) for the reduction of the PdO monolayer. 29 To evaluate HER and OER activity of catalyst-coated electrodes, hydrodynamic voltammograms (HVs) with a rotating disk electrode (RDE) were recorded at 5 mV s -1 from 0.1 to -0.5 V vs. RHE for HER and 1.2 to 1.9 V vs. RHE for OER in an Ar-saturated 0.5 M H2SO4 or 1 M KOH aqueous solution.…”

“…29 Therefore, the ECSA of Pd-based catalysts are determined by using the charge (QR) required for the reduction of the surface oxide, PdO, and using the next relation, 29 ECSA = QR/Qref (1) where Qref is a theoretical charge (424 µC cm -2 ) for the reduction of the PdO monolayer. 29 To evaluate HER and OER activity of catalyst-coated electrodes, hydrodynamic voltammograms (HVs) with a rotating disk electrode (RDE) were recorded at 5 mV s -1 from 0.1 to -0.5 V vs. RHE for HER and 1.2 to 1.9 V vs. RHE for OER in an Ar-saturated 0.5 M H2SO4 or 1 M KOH aqueous solution. Each RDE was rotated at 1600 rpm in order to eliminate the effects of gas bubbles during the HV measurement.…”

Pt nanoparticles anchored on Ti3C2 MXene‐derived TiO2 nanosheets for enhanced hydrogen evolution reaction

“…[10,11,14,18] Among numerous strategies, the Ti 3 C 2 MXene derived TiO 2 /Ti 3 C 2 composites exhibit good potentials in synthesizing the effective HER catalysts, because of the synergy effects of TiO 2 and Ti 3 C 2 MXene as well as the good 3D nanostructure. [19][20][21][22][23] In this paper, based on 2D Ti 3 C 2 MXene, the in situ Ti 3 C 2 MXene-derived TiO 2 NSs were fabricated and used as the support, and then Pt NPs were uniformly dispersed and anchored on their surface to obtain high-performance Pt/TiO 2 / Ti 3 C 2 composite catalyst. In this way, the adverse effects caused by multilayer Mxene stacking are minimized, and the more active sites of Pt NPs can be exposed on the surface to the greatest extent, thereby enhancing the HER activity.…”