One-pot production of a sea urchin-like alloy electrocatalyst for the oxygen electro-reduction reaction

Abstract

Designing a cost-effective catalyst with high performance towards oxygen electro-oxidation reaction (ORR) is of key interest for the development of green energy storage and conversion technologies. We report herein a...

Mixed-oxide-containing composite-supported MoPt with ultralow Pt content for accelerating hydrogen evolution performance

“…1d illustrates the deconvoluted Pt 4f XPS spectra with two doublet peaks assigned to a Pt 0 state (Pt 4f 7/2 (70.99 eV) and Pt 4f 5/2 (74.20 eV)) and Pt 2+ species (Pt 4f 7/2 (71.89 eV) and Pt 4f 5/2 (75.59 eV)), indicating the coexistence of metallic and oxidized Pt with the dominance of the metallic Pt 0 state. The observed binding energies in the Pt 4f XPS of the MoPt/Ti 0.9 Ir 0.1 O 2 –C catalyst were slightly changed to energy lower than those of the Pt/C catalyst, 13 strongly confirming the electronic effect between the three compounds, Pt, Mo, and Ti 0.9 Ir 0.1 O 2 –C. Fig.…”

“…1d illustrates the deconvoluted Pt 4f XPS spectra with two doublet peaks assigned to a Pt 0 state (Pt 4f 7/2 (70.99 eV) and Pt 4f 5/2 (74.20 eV)) and Pt 2+ species (Pt 4f 7/2 (71.89 eV) and Pt 4f 5/2 (75.59 eV)), indicating the coexistence of metallic and oxidized Pt with the dominance of the metallic Pt 0 state. The observed binding energies in the Pt 4f XPS of the MoPt/ Ti 0.9 Ir 0.1 O 2 -C catalyst were slightly changed to energy lower than those of the Pt/C catalyst, 13 strongly confirming the electronic effect between the three compounds, Pt, Mo, and Ti 0.9 Ir 0.1 O 2 -C. Fig. 1e depicts the deconvoluted Mo 5d XPS spectra with the presence of multi-valence states, including Mo 6+ (Mo 5d 5/2 of 232.46 eV, and Mo 5d 3/2 of 235.48 eV), Mo 4+ (Mo 5d 5/2 of 229.54 eV and Mo 5d 3/2 of 234.10 eV), and Mo 0 (231.15 eV), which agrees with previous studies of PtMo nanoalloy.…”

One-step pyrolysis synthesis of ternary (P,S,N)-doped graphene as an efficient metal-free electrocatalyst for the oxygen reduction reaction

“…So far, platinum (Pt) and Pt-based alloys have been considered as the most excellent catalysts during the ORR process due to the low overpotential and high current response. [7][8][9][10] However, the high cost and the weak durability of platinum (Pt) and Pt-based alloy catalysts severely limit their further commercialization. Therefore, seeking high activity and durability and low cost catalysts for the ORR has attracted great attention to solving the above problem.…”

Integrating Low Pt-Based Ternary NiRuPt Nanoalloy on Hybrid TiO2-Based Oxide–Carbon Composite for Enhanced Ethanol Oxidation

“…The Pt 0 content was calculated to be 81.13%, revealing the metallic Pt is the main chemical state of the Pt element on the as-obtained catalyst. Comparing the Pt/C catalyst, the Pt 4f 7/2 binding energy of the NiRuPt/Ti 0.9 Ir 0.1 O 2 –C was negatively shifted by 0.46 eV, suggesting the formation of the electronic effect. This was attributable to the electron transfer from the adjacent Ni, Ru, and Ti 0.9 Ir 0.1 O 2 –C to Pt that can promote the back-donation from the Pt 5d-orbital to the 2π*-orbital of CO, thereby reducing the CO-intermediate chemisorption and enhancing the CO tolerance of the as-made catalyst. , Figure panels g–i display TEM and HR-TEM images of the NiRuPt/Ti 0.9 Ir 0.1 O 2 –C, which demonstrated the existence of small-size nanoparticles with the different interplanar spacings of the rutile structure (∼3.20 Å) and crystal facets (∼2.20 Å of (110) and ∼1.96 Å of (200)) of the fcc Pt.…”

“…The Pt 0 content was calculated to be 81.13%, revealing the metallic Pt is the main chemical state of the Pt element on the as-obtained catalyst. Comparing the Pt/C catalyst, 18 the Pt 4f 7/2 binding energy of the NiRuPt/ Ti 0.9 Ir 0.1 O 2 −C was negatively shifted by 0.46 eV, suggesting the formation of the electronic effect. This was attributable to the electron transfer from the adjacent Ni, Ru, and Ti 0.9 Ir 0.1 O 2 −C to Pt that can promote the back-donation from the Pt 5d-orbital to the 2π*-orbital of CO, thereby reducing the CO-intermediate chemisorption and enhancing the CO tolerance of the as-made catalyst.…”