Engineering PtRu bimetallic nanoparticles with adjustable alloying degree for methanol electrooxidation: Enhanced catalytic performance

Zhang, Junming; Qu, Xi‐Ming; Han, Yu; Shen, Linfan; Yin, Shuhu; Li, Guang; Jiang, Yanxia; Sun, Shi‐Gang

doi:10.1016/j.apcatb.2019.118345

Cited by 155 publications

(78 citation statements)

References 64 publications

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“…2b, c). Obviously, compared with HEA-400, the HEA-700 has a lower d-band centers due to the compressive strain, which can regulate the adsorption/desorption capacities of activating reactant or intermediates and improve the electrocatalytic activity in MOR [36][37][38]. This result is consistent with the above XPS analysis of the Pt 4f XPS spectra.…”

Section: Articles Science China Materialssupporting

confidence: 83%

Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation

et al. 2021

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High-entropy alloys (HEAs) have been widely studied due to their unconventional compositions and unique physicochemical properties for various applications. Herein, for the first time, we propose a surface strain strategy to tune the electrocatalytic activity of HEAs for methanol oxidation reaction (MOR). High-resolution aberration-corrected scanning transmission electron microscopy (STEM) and elemental mapping demonstrate both uniform atomic dispersion and the formation of a face-centered cubic (FCC) crystalline structure in PtFeCoNiCu HEAs. The HEAs obtained by heat treatment at 700°C (HEA-700) exhibit 0.94% compressive strain compared with that obtained at 400°C (HEA-400). As expected, the specific activity and mass activity of HEA-700 is higher than that of HEA-400 and most of the state-of-the-art catalysts. The enhanced MOR activity can be attributed to a shorter Pt-Pt bond distance in HEA-700 resulting from compressive strain. The nonprecious metal atoms in the core could generate compressive strain and down shift d-band centers via electron transfer to surface Pt layer. This work presents a new perspective for the design of high-performance HEAs electrocatalysts.

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Section: Articles Science China Materialssupporting

confidence: 83%

Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation

et al. 2021

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“…This is in accordance with the HRTEM results. When compared with the PtNiNC‐NGA, the PtNiNF‐NGA shows positively shifted peaks, indicating a higher compressive strain and alloying degree in the PtNiNF‐NGA, which may be due to an atom rearrangement during the tert‐butanol‐assisted Ni leaching process [7c] . The composition and the valence state of the elements on the surface of the PtNiNF‐NGA, the PtNiNC‐NGA, and commercial Pt/C were characterized by XPS (Figures 2 c and d).…”

Section: Resultsmentioning

confidence: 99%

“…[3] To date,a greement has been reached on how to improve activity,w ith the general strategies being via increasing the number of active sites and improving the intrinsic activity of each site. [4] Regarding the electrocatalytic stability,t he construction of stabilized Pt alloys,s uch as alloys with Pt-rich surface, [1a,5] intermetallic phase, [6] and high alloying degree, [7] etc., has been proved to be an efficient way.H owever,t hese kinds of electrocatalysts often possess asolid morphology,and the inner Pt atoms are essentially wasted, [8] resulting in amoderate activity.Recently,t he combination of high-porosity one-dimensional Pt-rich surface structure and commercial carbon black (C) support has been demonstrated to be an effective strategy for the preparation of electrocatalysts with both high activity and excellent stability. [2d,9] Theas-developed bunched Pt-Ni alloy nanocages/C electrocatalysts exhibited asuperior activity and durability toward oxygen reduction reaction, even in fuel cell tests.…”

Section: Introductionmentioning

confidence: 99%

A Robust PtNi Nanoframe/N‐Doped Graphene Aerogel Electrocatalyst with Both High Activity and Stability

et al. 2021

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Insufficient catalytic activity and stability and high cost are the barriers for Pt‐based electrocatalysts in wide practical applications. Herein, a hierarchically porous PtNi nanoframe/N‐doped graphene aerogel (PtNiNF‐NGA) electrocatalyst with outstanding performance toward methanol oxidation reaction (MOR) in acid electrolyte has been developed via facile tert‐butanol‐assisted structure reconfiguration. The ensemble of high‐alloying‐degree‐modulated electronic structure and correspondingly the optimum MOR reaction pathway, the structure superiorities of hierarchical porosity, thin edges, Pt‐rich corners, and the anchoring effect of the NGA, endow the PtNiNF‐NGA with both prominent electrocatalytic activity and stability. The mass and specific activity (1647 mA mgPt−1, 3.8 mA cm−2) of the PtNiNF‐NGA are 5.8 and 7.8 times higher than those of commercial Pt/C. It exhibits exceptional stability under a 5‐hour chronoamperometry test and 2200‐cycle cyclic voltammetry scanning.

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“…The addition of a second metal to Pt could provide more sites to adsorb the oxygenated species and promotes the water activation, hence facilitates the oxidative removal of intermediate carbonaceous species (CO ads ) at lower potential and helpful in weakening the CO adsorption on the Pt surfaces 64,65 . Rh metal is one type of rare precious metal category in the same group with Ru recently attempted to alloy with Pt catalyst via a facile co‐reduction method using NaBH 4 at room temperature without any surfactant template.…”

Section: Class Of Dlfcmentioning

confidence: 99%

Progress and challenges: Review for direct liquid fuel cell

et al. 2021

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Summary Direct liquid fuel cell (DLFC) is one of the leading fuel cell types due to their great features of superior energy density, modest configuration, small size in fuel container, immediate boosting, and effortless storage and carriage. Commercially used liquid fuel types are prepared using alcohols, such as methanol or ethanol, glycol, and acids. DLFCs face great challenges although they are potentially far‐reaching depending on the expensive catalysts and the use of high‐loading catalyst. More questions that should be addressed to ensure excellent DLFC performance include cathode flooding, fuel crossover, numerous side yield production, fuel security, and unverified elongated‐duration robustness. Further studies need to be carried out to ensure the continuous improvement of the quality of DLFCs' performance and their penetration in the commercial market. To date, direct liquid fuel cells made of methanol and ethanol have been successfully produced in commercial scale, but other types of DLFCs are still under study. In this review, introduction to DLFC will be discussed by covering work and commercialization as well as recent progress and challenges encountered.

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Engineering PtRu bimetallic nanoparticles with adjustable alloying degree for methanol electrooxidation: Enhanced catalytic performance

Cited by 155 publications

References 64 publications

Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation

Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation

A Robust PtNi Nanoframe/N‐Doped Graphene Aerogel Electrocatalyst with Both High Activity and Stability

Progress and challenges: Review for direct liquid fuel cell

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