Halide ion-induced formation of single crystalline mesoporous PtPd bimetallic nanoparticles with hollow interiors for electrochemical methanol and ethanol oxidation reaction

Qiu, Pengtao; Lian, Shaomin; Yang, Guang; Yang, Shengchun

doi:10.1007/s12274-016-1367-4

Cited by 50 publications

(35 citation statements)

References 62 publications

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“…To enhance the electrochemical performance of DMFCs, enormous attempts have been made earlier on the development of highly efficient MOR electrocatalysts . So far, the state‐of‐the‐art MOR catalysts are Pt‐based materials; however, their large‐scale application remains a big challenge, mainly related with the high cost, limited resources, poor stability, and decreasing activity toward poisoning . Alternatively, Pd‐based materials have emerged as potential replacements of Pt catalysts used in DMFCs for its relatively high abundance, reasonable MOR activity, and stability .…”

Section: Introductionmentioning

confidence: 99%

Galvanic Replacement–Mediated Synthesis of Ni‐Supported Pd Nanoparticles with Strong Metal–Support Interaction for Methanol Electro‐oxidation

Lei

Sun

et al. 2019

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as oxygen reduction reaction (ORR). [2][3][4] In contrast, the DMFCs performed in an alkaline medium exhibit inherent advantages, including: i) improved MOR and ORR kinetics, [5] ii) broad practicality of precious metal-free electrocatalysts, [6] and iii) low cost, [7] and thus have attracted more attention. To enhance the electrochemical performance of DMFCs, enormous attempts have been made earlier on the development of highly efficient MOR electrocatalysts. [8][9][10] So far, the state-of-the-art MOR catalysts are Pt-based materials; [11][12][13][14] however, their large-scale application remains a big challenge, mainly related with the high cost, limited resources, poor stability, and decreasing activity toward poisoning. [15,16] Alternatively, Pd-based materials have emerged as potential replacements of Pt catalysts used in DMFCs for its relatively high abundance, reasonable MOR activity, and stability. [17][18][19] However, the MOR electroactivity of Pd-based materials is still inferior to those of Pt catalysts, which inspires further investigation on advanced Pd-based catalysts with improved activity and durability.Typically, there are two approaches to accomplish this target. One efficient way is nanoengineering of the catalyst to build 3D porous architectures. Such a nanoporous structure not only ensures the efficient utilization of precious Pd with high active surface areas and rich active sites, but also offers fast and efficient transport pathways to enable a favorable reaction kinetics. [20,21] Nevertheless, structure construction alone is not enough, as the single Pd catalysts are vulnerable toward poisoning by MOR intermediate products such as CO. [22] An important strategy for this issue is to combine nanostructured Pd with other supporting materials to improve the intrinsic activity and stability, for instance, transition metals Ni, [23,24] Cu, [20,25] or metal oxides such as Cu 2 O, [26] TiO 2 , [27] and CeO 2 . [28] It was demonstrated that the enhancement was attributed to the bifunctional mechanism and electronic effect, [4,10] that worked together to promote the MOR. These oxophilic metals and more oxygen-rich groups within the catalyst structure can effectively capture OH − species in alkaline media to weaken the adsorption of CO and thus decrease its poisoning on the active sites. [26,29] However, in this regard, the synthesis of Pd-based materials with strong interactions between the highly dispersed Pd and Herein, well-defined Pd nanoparticles (NPs) developed on Ni substrate (Pd NPs/Ni) are synthesized via a facile galvanic replacement reaction (GRR) route performed in ethaline-based deep eutectic solvent (DES). For comparison, a Pd NPs/Ni composite is also prepared by the GRR method conducted in an aqueous solution. The Pd NPs/Ni obtained from the ethaline-DES is catalytically more active and durable for the methanol electro-oxidation reaction (MOR) than those of the counterpart derived from conventional aqueous solution and commercial Pd/C under alkaline media. Detailed kinetic analysi...

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Section: Introductionmentioning

confidence: 99%

Galvanic Replacement–Mediated Synthesis of Ni‐Supported Pd Nanoparticles with Strong Metal–Support Interaction for Methanol Electro‐oxidation

Lei

Sun

et al. 2019

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“…More significantly, these branched cube subunits clearly present well defined, continuous fringes with an orientation along [001] zone axis. No obvious grain boundary can be observed, which evidences a good crystallinity of the nanocrystals . The measured d‐spacing of lattices is ∼1.92 Å, which is slightly smaller than (200) planes of the face‐centered cubic (fcc) Pt (1.96 Å).…”

Section: Figurementioning

confidence: 90%

Ternary PtPdCu Multicubes as a Highly Active and Durable Catalyst toward the Oxygen Reduction Reaction

Zhao

Wang

et al. 2018

ChemElectroChem

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It has been reported that a Pt‐based concave‐convex structure offers good electrocatalytic activity toward the oxygen reduction reaction (ORR). Herein, we synthesize ternary PtPdCu multicubes with a hierarchical trepanning concave‐convex structure by a facile solvothermal co‐reduction method. By tailoring the elementary composition, the optimal Pt45Pd30Cu25/C catalyst results in a 2.35‐fold increase in ORR mass activity compared to commercial Pt/C and an excellent long‐term stability. Investigation reveals that the performance enhancement mechanism is mainly caused by the Pd and Cu jointly modified electronic structure of Pt, which facilitates the charge transfer rate as well as the increased number of active sites and improved mass transport by the unique porous multicube concave‐convex structure. Both experiment and theoretical calculations reveal that the three‐elements alloy catalyst and the unique structures play a critical role in high catalytic performance, thus offering guidance to design high‐performance electrocatalysts not only toward the ORR for practical applications in low‐temperature fuel cells, but also for other energy conversion systems rendering a universal significance.

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“…Similar reaction condition, in the absence of halide salts, afforded Pt NPs and TEM images show well dispersed Pt NPs with particle size of 3–8 nm (Figure d‐f). Reduction rate of Pt 2+ is lowered by Br − and Cl − ions and hence helps to growth such a high index facets . The effect of various amount of KCl on the shape and size of Pt TPs is depicted in Figure S1.…”

Section: Methodsmentioning

confidence: 99%

Bifunctional Platinum Tetrapods: High‐Performance Catalyst for Hydrogenation of Aromatic Nitro Compounds and Electrochemical Sensor for Hydrazine.

et al. 2019

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Precise engineering of platinum as nanostructured platinum tetrapods (Pt TPs) is achieved via a facile one‐step hydrothermal synthesis using KCl and KBr as structure directing agents. Heavily influenced by its size and shape, Pt TPs exhibits excellent catalytic activity, selectivity and recyclability in hydrogenation of nitroarenes and acts as an electrochemical sensor for hydrazine. This enhanced activity is attributed to the surface structure of Pt with high‐index facets.

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Halide ion-induced formation of single crystalline mesoporous PtPd bimetallic nanoparticles with hollow interiors for electrochemical methanol and ethanol oxidation reaction

Cited by 50 publications

References 62 publications

Galvanic Replacement–Mediated Synthesis of Ni‐Supported Pd Nanoparticles with Strong Metal–Support Interaction for Methanol Electro‐oxidation

Galvanic Replacement–Mediated Synthesis of Ni‐Supported Pd Nanoparticles with Strong Metal–Support Interaction for Methanol Electro‐oxidation

Ternary PtPdCu Multicubes as a Highly Active and Durable Catalyst toward the Oxygen Reduction Reaction

Bifunctional Platinum Tetrapods: High‐Performance Catalyst for Hydrogenation of Aromatic Nitro Compounds and Electrochemical Sensor for Hydrazine.

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