Microwave-assisted synthesis of multiply-twinned Au–Ag nanocrystals on reduced graphene oxide for high catalytic performance towards hydrogen evolution reaction

Qin, Yuchen; Dai, Xiaoping; Zhang, Xin; Huang, Xingliang; Sun, Hui; Gao, Daowei; Yu, Yanbing; Zhang, Pengfang; Jiang, Yan; Zhuo, Hongying; Jin, Axiang; Wang, Hai

doi:10.1039/c5ta10428a

Cited by 34 publications

(13 citation statements)

References 43 publications

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“…Note that the ratio of oxidized state (Pt 2+ + Pt 4+ ) of Pt in Pt–Cu–Mn PNFs and Pt–Cu–Mn UNFs is ≈41.8% and 33.9%, respectively. The high oxidized state confirms the as‐prepared products possess abundant twinned defects on the surface since twinned defects are easy to be oxidized in air, which is consistent with the aforementioned HRTEM results. Compared to Pt–Cu–Mn PNFs, the lower oxidized state of Pt in Pt–Cu–Mn UNFs may suggest the little fewer twinned defects exist on the surface.…”

Section: Resultssupporting

confidence: 86%

Fine‐Tuning Intrinsic Strain in Penta‐Twinned Pt–Cu–Mn Nanoframes Boosts Oxygen Reduction Catalysis

Qin

Zhang

Guo

et al. 2020

Adv Funct Materials

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118

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Tuning the intrinsic strain of Pt‐based nanomaterials has shown great promise for improving the oxygen reduction reaction (ORR) performance. Herein, reported is a tunable surface strain in penta‐twinned ternary Pt–Cu–Mn nanoframes (NFs). Pt–Cu–Mn ultrafine NFs (UNFs) exhibit ≈1.5% compressive strain compared to Pt–Cu–Mn pentagonal NFs (PNFs) and show the superior activity toward ORR in an alkaline environment. Specifically, the specific and mass activity of Pt–Cu–Mn UNFs are 3.38 mA cm−2 and 1.45 A mg−1, respectively, which is 1.45 and 1.71 times higher than that of Pt–Cu–Mn PNFs, demonstrating that compressive strain in NFs structure can effectively enhance the catalytic activity of ORR. Impressively, Pt–Cu–Mn UNFs exhibit 8.67 and 9.67 times enhanced specific and mass activity compared with commercial Pt/C. Theoretical calculations reveal that compression on the surface of Pt–Cu–Mn UNFs can weaken the bonding strengths and adsorption of oxygen‐containing intermediates, resulting in an optimal condition for ORR.

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Section: Resultssupporting

confidence: 86%

Fine‐Tuning Intrinsic Strain in Penta‐Twinned Pt–Cu–Mn Nanoframes Boosts Oxygen Reduction Catalysis

Qin

Zhang

Guo

et al. 2020

Adv Funct Materials

Self Cite

118

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show abstract

“…[1][2][3][4] Motivated by achieving additional properties that arise from combining monometallic constituents on the nanoscale, noble-metalbased bimetallic alloy nanoparticles (NPs) have gained much interest. [5][6][7][8] Furthermore,a lloying with other non-noblem etals, such as transition metals or base metals,g enerally lowers the cost. Therefore, many studies have focused on developing new methods for the fabrication of bimetallic alloys, such as chemical co-reduction methods [9] laser ablation alloy target in liquids, [10] andmicrowave irradiation.…”

Section: Introductionmentioning

confidence: 99%

Laser‐Irradiation‐Induced Melting and Reduction Reaction for the Formation of Pt‐Based Bimetallic Alloy Particles in Liquids

Han

Dai

et al. 2017

ChemPhysChem

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Laser melting in liquids (LML) is one of the most effective methods to prepare bimetallic alloys; however, despite being an ongoing focus of research, the process involved in the formation of such species remains ambiguous. In this paper, we prepared two types of Pt-based bimetallic alloys by LML, including Pt-Au alloys and Pt-iron group metal (iM=Fe/Co/Ni) alloys, and investigated the corresponding mechanisms of alloying process. Detailed component and structural characterizations indicate that laser irradiation induced a quite rapid formation process (not exceeding 10 s) of Pt-Au alloy nanospheres, and the crystalline structures of Pt-Au alloys is determined by the monometallic constituents with higher content. For Pt-iM alloys, we provide direct evidence to support the conclusion that FeO /CoO /NiO colloids can be reduced to elementary Fe/Co/Ni particles by ethanol molecules during laser irradiation, which then react with Pt colloids to form Pt-iM sub-microspheres. These results demonstrate that LML provides an optional route to prepare Pt-based bimetallic alloy particles with tunable size, components, and crystalline phase, which should have promising applications in biological and catalysis studies.

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“…In addition, fuel cells, which can obtain clean electricity from chemical energy stored in fuel through electrochemical processes, also play an important role in realizing energy sustainable development . However, the practical application of these technologies is still hindered by the sluggish kinetics of some crucial reactions, especially for electrochemical CO 2 reduction reaction (CO 2 RR), oxygen reduction reaction (ORR), formic acid oxidation reaction (FAOR) and hydrogen evolution reaction (HER) . Hence, rational design of efficient and durable electrocatalysts for the above‐mentioned reactions is of paramount importance to increase the efficiency of these energy conversion technologies.…”

Section: Introductionmentioning

confidence: 99%

Applications of Metal Nanocrystals with Twin Defects in Electrocatalysis

Yuan

Yao

et al. 2020

Chemistry An Asian Journal

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Electrocatalytic energy conversion is one of the most promising pathways to develop clean and renewable energy technologies, and the development of high-performance electrocatalysts to improve the energy conversion efficiency is of paramount importance. Metal nanocrystals with twin defects possess unique features, including lattice strain and high density of low-coordinated atoms at the twin boundary, endowing them with excellent catalytic performance in various electrocatalytic reactions. Herein, we briefly summarize recent advances in the synthesis of metal nanocrystals with various twin structures, recent breakthroughs related to electrocatalytic applications of twin metal nanocrystals are also overviewed. Finally, the major challenges and perspectives for future development of twin metal nanocrystals in electrochemical applications are proposed.

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Microwave-assisted synthesis of multiply-twinned Au–Ag nanocrystals on reduced graphene oxide for high catalytic performance towards hydrogen evolution reaction

Abstract: Multiply-twinned Au–Ag NCs/rGO are prepared by a one-pot method under microwave irradiation and exhibit excellent HER activity and stability.

Cited by 34 publications

References 43 publications

Fine‐Tuning Intrinsic Strain in Penta‐Twinned Pt–Cu–Mn Nanoframes Boosts Oxygen Reduction Catalysis

Fine‐Tuning Intrinsic Strain in Penta‐Twinned Pt–Cu–Mn Nanoframes Boosts Oxygen Reduction Catalysis

Laser‐Irradiation‐Induced Melting and Reduction Reaction for the Formation of Pt‐Based Bimetallic Alloy Particles in Liquids

Applications of Metal Nanocrystals with Twin Defects in Electrocatalysis

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