Anchoring ultrafine Pt electrocatalysts on TiO2-C via photochemical strategy to enhance the stability and efficiency for oxygen reduction reaction

Wang, Jingyu; Xu, Min; Zhao, Jianquan; Fang, Huaifang; Huang, Qingzhu; Xiao, Weiping; Li, Tao; Wang, Deli

doi:10.1016/j.apcatb.2018.05.085

Cited by 94 publications

(62 citation statements)

References 54 publications

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“…The presence of Pd in the non‐electrochemically and electrochemically stabilized Ti/Pt−Pd/GNR nanocomposites favored the transfer of electrons from the catalyst to the metal support; in other words, it contributed to Pd oxidation. This result is contrary to the effect of strong metal‐support interaction (SMSI), which leads to the transfer of electrons from the support to the catalyst …”

Section: Resultsmentioning

confidence: 78%

Ti/Pt−Pd‐Based Nanocomposite: Effects of Metal Oxides on the Oxygen Reduction Reaction

2020

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Over the last few years, there has been an intensive search for stable and highly active electrocatalysts, which are intended to be applied in oxygen reduction reaction (ORR) preferably without the use of noble metals or with the application of a very small quantity of these metals in the process. Electrocatalysts that satisfy these conditions can be composed of Ti and other metals, supported or not by carbonaceous materials. The present work reports the application of synthesized threedimensional Ti/PtÀ Pd nanoparticles with highly rough surfaces supported on graphene nanoribbons (Ti/PtÀ Pd/GNR nanocomposite) by a single one-pot reaction, and applied in ORR. Unlike the effect of strong metal-support interaction (SMSI), which favors electrons transfer from the metal support to the catalyst, the mechanism employed in this study favored the transfer of electrons from the catalyst to the metal support; in other words, the mechanism led to the oxidation of Pt and Pd. Pt, which exhibited PtÀ Pd type alloy features, was found to be more externally distributed at the rough surface of the metallic structures. Additionally, Ti, which presented oxide features, was found to be even more externally distributed at the surface of PtÀ Pd on non-electrochemically and electrochemically stabilized Ti/PtÀ Pd/GNR nanocomposite electrodes. Since all these metals have great amounts of different oxides (i. e. are highly oxidized), the oxides are found to be energetically responsible for the improvement in ORR electrocatalytic activity and stability of Ti/PtÀ Pd/GNR/GC electrodes in comparison with the ORR responses for PtC TKK/GC and PtÀ Pd/GNR/GC modified electrodes. To Ti-containing catalysts, the high activity is attributable to enhancing the intrinsic activity and the high selectivity to 4-electron ORR is due to the fact that presence of Ti contributes to oxygen-binding energy of these nanocomposites shifts toward more positive values (weakening oxygen bonding).[a] G.

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Section: Resultsmentioning

confidence: 78%

Ti/Pt−Pd‐Based Nanocomposite: Effects of Metal Oxides on the Oxygen Reduction Reaction

2020

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“…Generally, the reaction rates that are normalized to the active sites allow the direct comparison of intrinsic reactivity on different catalysts 47–49 . For the catalytic system employing same catalyst, the reaction rate appears to be independent of the loading amount of catalyst after normalization to the same amount 50,51 . In this regard, the porous HCP-TiO 2 -FG photocatalyst possesses equivalent catalytic active sites to TiO 2 /HCP-FG due to the same content of TiO 2 photocatalyst.…”

Section: Resultsmentioning

confidence: 99%

Porous hypercrosslinked polymer-TiO2-graphene composite photocatalysts for visible-light-driven CO2 conversion

et al. 2019

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Significant efforts have been devoted to develop efficient visible-light-driven photocatalysts for the conversion of CO2 to chemical fuels. The photocatalytic efficiency for this transformation largely depends on CO2 adsorption and diffusion. However, the CO2 adsorption on the surface of photocatalysts is generally low due to their low specific surface area and the lack of matched pores. Here we report a well-defined porous hypercrosslinked polymer-TiO2-graphene composite structure with relatively high surface area i.e., 988 m2 g−1 and CO2 uptake capacity i.e., 12.87 wt%. This composite shows high photocatalytic performance especially for CH4 production, i.e., 27.62 μmol g−1 h−1, under mild reaction conditions without the use of sacrificial reagents or precious metal co-catalysts. The enhanced CO2 reactivity can be ascribed to their improved CO2 adsorption and diffusion, visible-light absorption, and photo-generated charge separation efficiency. This strategy provides new insights into the combination of microporous organic polymers with photocatalysts for solar-to-fuel conversion.

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“…Compared with MgO, the special structure of cobalt porphyrins, in which the Co atoms were strongly coordinated with N atoms, can effectively immobilize the cobalt atoms on the carbon layer, thus the Co species can be retained. As shown in Figures 4D,E, the HRTEM images of M-Co-N-C and M-Co-N-C-6 revealed the lattice fringe space value of 0.24 and 0.29 nm, which might be in good agreement with (111) facet of MgO and (220) facet of crystalline Co 3 O 4 (Jin et al, 2015; Yan et al, 2016; Yang et al, 2016a; Wang et al, 2018). The result was in good agreement with the XRD analysis.…”

Section: Resultsmentioning

confidence: 71%

The Co-N-C Catalyst Synthesized With a Hard-Template and Etching Method to Achieve Well-Dispersed Active Sites for Ethylbenzene Oxidation

et al. 2019

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Biomass obtained from organic residues gradually becomes one of the optimal renewable feedstock of value added chemicals. Herein, the Co-N-C catalyst was prepared via a hard-template and etching method using the casein as C and N sources, magnesium oxide as the template, and cobalt porphyrin as the metal precursor. The obtained Co-N-C catalyst exhibited excellent catalytic performance for selective oxidation of ethylbenzene with a conversion rate of 96.5% under mild conditions. Moreover, the catalysts were investigated by techniques such as BET, XRD, Raman, transmission electron microscopic (TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that the etching progress could improve the dispersion of Co and the exposure of active sites. Herein, the efficient oxidation of ethylbenzene was attributed to the well-dispersed Co-N species and the increased specific surface area.

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Anchoring ultrafine Pt electrocatalysts on TiO2-C via photochemical strategy to enhance the stability and efficiency for oxygen reduction reaction

Cited by 94 publications

References 54 publications

Ti/Pt−Pd‐Based Nanocomposite: Effects of Metal Oxides on the Oxygen Reduction Reaction

Ti/Pt−Pd‐Based Nanocomposite: Effects of Metal Oxides on the Oxygen Reduction Reaction

Porous hypercrosslinked polymer-TiO2-graphene composite photocatalysts for visible-light-driven CO2 conversion

The Co-N-C Catalyst Synthesized With a Hard-Template and Etching Method to Achieve Well-Dispersed Active Sites for Ethylbenzene Oxidation

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