Efficient oxygen reduction catalysis by subnanometer Pt alloy nanowires

Jiang, Kezhu; Zhao, Dandan; Guo, Shaojun; Zhang, Xu; Zhu, Xing; Guo, Jun; Lü, Gang; Huang, Xiaoqing

doi:10.1126/sciadv.1601705

Cited by 344 publications

(245 citation statements)

References 64 publications

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“…Guo and X.Q. Huang et al found that subnanometer PtNi and PtNiCo nanowires show high ORR activity for the atomic level character and alloy effect, compared with no ORR activity in Pt alloy nanoparticles (less than 2 nm) [75]. As a result, catalytic activity usually shows a volcano-like trend as a function of the structural descriptors; this is shown in the third column in Fig.…”

Section: Tolerance Factor and E G -Electron Numbermentioning

confidence: 94%

Adsorption-energy-based activity descriptors for electrocatalysts in energy storage applications

Wang

Qiu

Song

et al. 2017

National Science Review

144

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Energy storage technologies, such as fuel cells, ammonia production and lithium-air batteries, are important strategies for addressing the global challenge of energy crisis and environmental pollution. Taking overpotential as a direct criterion, we illustrate in theory and experiment that the adsorption energies of charged species such as Li + +e − and H + +e − are a central parameter to describe catalytic activities related to electricity-in/electricity-out efficiencies. The essence of catalytic activity is revealed to relate with electronic coupling between catalysts and charged species. Based on adsorption energy, some activity descriptors such as d-band center, e g -electron number and charge-transfer capacity are further defined by electronic properties of catalysts that directly affect interaction between catalysts and charged species. The present review is helpful for understanding the catalytic mechanisms of these electrocatalytic reactions and developing accurate catalytic descriptors, which can be employed to screen high-activity catalysts in future high-throughput calculations and experiments.

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Section: Tolerance Factor and E G -Electron Numbermentioning

confidence: 94%

Adsorption-energy-based activity descriptors for electrocatalysts in energy storage applications

Wang

Qiu

Song

et al. 2017

National Science Review

144

View full text Add to dashboard Cite

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“…Another popular approach is tailoring the morphology or structure of a nanocrystal in combination with the decrease of its size . For this purpose, 1D Pt‐based ultrathin nanowires (NWs) have been developed with multiple advantages compared to their 0D counterparts, including inherent anisotropic structure, high flexibility, and outstanding conductivity . Besides, coupling Pt nanocrystals with an appropriate support, 2D materials in particular, is another attractive route to further boost the catalytic properties .…”

Section: Introductionmentioning

confidence: 99%

Coupling PtNi Ultrathin Nanowires with MXenes for Boosting Electrocatalytic Hydrogen Evolution in Both Acidic and Alkaline Solutions

Jiang

Yan

et al. 2019

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Developing an efficient electrocatalyst for the hydrogen evolution reaction (HER) working in both acidic and alkaline solutions is highly desirable, but still remains challenging. Here, PtxNi ultrathin nanowires (NWs) with tunable compositions (x = 1.42, 3.21, 5.67) are in situ grown on MXenes (Ti3C2 nanosheets), serving as electrocatalysts toward HER. Such PtxNi@Ti3C2 electrocatalysts exhibit excellent HER performance in both acidic and alkaline solutions, with the Pt3.21Ni@Ti3C2 being the best one. Specifically, Pt3.21Ni@Ti3C2 achieves record‐breaking performance in terms of lowest overpotential (18.55 mV) and smallest Tafel slope (13.37 mV dec−1) for HER in acidic media to date. Theory calculations and X‐ray photoelectron spectroscopy analyses demonstrate that the coupling of MXenes with the NWs not only approaches the Gibbs free energy for hydrogen adsorption close to zero through the electron transfer between them in acidic media, but also provides additional active sites for water dissociation in alkaline solution, both of them being beneficial to the HER performance.

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“…The morphologies of above catalysts before and after stability testing were also characterized using TEM and HRTEM, revealing that the Pd@PtNi NWs became incomplete hollow structures with the dissolution of Pd and maintained the 1D nanostructure after the stability test (Figures S6a,b and S7a,b, Supporting Information). In contrast, serious sintering and aggregation was observed for PdPtNi NPs/C (Figure S8, Supporting Information) and commercial Pt/C (Figure S9a,b, Supporting Information),therefore demonstrating that the unique 1D nanostructure is more effective at preventing dissolution, Ostwald ripening, and aggregation than nanoparticles during long term operation, and is beneficial for the enhancement of durability of Pt‐based catalysts.…”

Section: Resultsmentioning

confidence: 99%

High‐Indexed PtNi Alloy Skin Spiraled on Pd Nanowires for Highly Efficient Oxygen Reduction Reaction Catalysis

Zhao

Lü

Dang

et al. 2019

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The catalytic performance of Pt‐based catalysts for oxygen reduction reactions (ORR) can generally be enhanced by constructing high‐index exposed facets (HIFs). However, the synthesis of Pt alloyed high‐index skins on 1D non‐Pt surfaces to further improve Pt utilization and stability remains a fundamental challenge for practical nanocrystals. In this work, Pd nanowires (NWs) are selected as a rational medium to facilitate the epitaxial growth of Pt and Ni. Based on the different nucleation and growth habits of Pt and Ni, a continuous PtNi alloy skin bounded with HIFs spiraled on a Pd core can be obtained. Here, the as‐prepared helical Pd@PtNi NWs possess high HIF densities, low Pt contents, and optimized oxygen adsorption energies, demonstrating an enhanced ORR mass activity of 1.75 A mgPt−1 and a specific activity of 3.18 mA cm−2, which are 10 times and 12 times higher than commercial Pt/C catalysts, respectively. In addition, the 1D nanostructure enables the catalyst to be highly stable after 30 000 potential sweeping cycles. This work successfully extends bulky high‐indexed Pt alloys to core–shell nanostructures with the design of a new, highly efficient and stable Pt‐based catalyst for fuel cells.

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Efficient oxygen reduction catalysis by subnanometer Pt alloy nanowires

Abstract: Highly efficient oxygen reduction electrocatalysis was enabled by a new class of subnanometer Pt alloy nanowires.

Cited by 344 publications

References 64 publications

Adsorption-energy-based activity descriptors for electrocatalysts in energy storage applications

Adsorption-energy-based activity descriptors for electrocatalysts in energy storage applications

Coupling PtNi Ultrathin Nanowires with MXenes for Boosting Electrocatalytic Hydrogen Evolution in Both Acidic and Alkaline Solutions

High‐Indexed PtNi Alloy Skin Spiraled on Pd Nanowires for Highly Efficient Oxygen Reduction Reaction Catalysis

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