Oxide-derived nanostructured metallic-glass electrodes for efficient electrochemical hydrogen generation

Gao, Shenghan; Jia, Jingchun; Chen, Shuangqin; Luan, Hengwei; Shao, Yang; Yao, Kefu

doi:10.1039/c7ra02954c

Cited by 18 publications

(21 citation statements)

References 36 publications

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“…A similar self‐stabilizing behavior was also confirmed by Gao et al . in a Pd−Ni−Si−P metallic glass with hierarchical nanostructures . These results indicate that such unique self‐stabilization may be universal for metallic glassy catalysts.…”

Section: Functional Properties Of Metallic Glasses In Electrocatalysismentioning

confidence: 71%

“…By means of nanoimprinting, fine even hierarchical nanostructures can be fabricated on the surface of MGs (Figure A) . The embossing of these nanostructures largely increases the surface area and thus boosts the electrocatalytic performance of MGs in HER and fuel cells ,. Further surface modification can be realized by dealloying and constituent replacement at the nanoscale .…”

Section: Optimizing Metallic Glassy Catalystsmentioning

confidence: 99%

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Functional Applications of Metallic Glasses in Electrocatalysis

Sun

2019

ChemCatChem

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Metallic glasses (MGs), which are also known as amorphous metals, are formed by quenching the melts at a super high cooling rate (e. g. 106 K/s) to avoid crystallization. Compared with ordinary metals, there is no long‐range translational order and crystalline defects in MGs. Benefitting from this unique structural characteristic, MGs show many superior mechanical, physical and chemical properties and thus have been attracting intensive attentions in applications as structural materials. The investigations on the functional properties of MGs are still at the early stage, but immense potential in electrochemically functional applications has been demonstrated in recent years. In this Minireview, we aim to present an overview of the functional properties of this class of novel metallic glassy catalysts and some achievements obtained so far. We mainly focus on the applications of MGs in various electrochemical applications, like hydrogen evolution reaction and oxygen evolution reaction as well as fuel cells. The strategies for optimizing the performance of these amorphous catalysts are discussed as well, including high‐throughput screening and nano‐engineering. In the absence of crystalline ordering, the atomic‐scale structural mechanism of MGs in electrocatalysis may be unique and will be explored. Finally, we also give perspectives on how to design novel and superior electrocatalysts for future electrocatalysis applications.

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Section: Functional Properties Of Metallic Glasses In Electrocatalysismentioning

confidence: 71%

Section: Optimizing Metallic Glassy Catalystsmentioning

confidence: 99%

Functional Applications of Metallic Glasses in Electrocatalysis

Sun

2019

ChemCatChem

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“…MGs offer much greater range of solubility for alloying elements than crystalline alloys which could further extend electrochemical properties. [98] Cao et al [97] have experimentally shown that the flat Pd 40.5 Ni 40.5-Si 4.5 P 14.5 BMG plate, BMG nanowires and Pt/C electrodes achieved a current density of À10 mA cm À2 at overpotentials of 138, 63, and 32 mV during electrochemical hydrogen generation, as shown in Figure 16a. In addition to amorphous structure and complicated composition, the amount of surface area plays a very important role in electrochemical properties of MGs.…”

Section: Electrochemical Propertiesmentioning

confidence: 95%

“…[92] Therefore, the amorphous structure of MGs is regarded as ideal chemically homogeneous structure with respect to electrochemical corrosion and electrocatalysis. [91,96,97] High surface area supplied by MG nanowires fabricated by nanomolding method described above increases electrochemical surface area during fuel cell operation or hydrogen evolution reaction. [91] Investigation of metallic glassy ribbons, [90,93] electrodeposited amorphous alloys, [90,94] and BMGs [95] has confirmed the excellent electrochemical properties of MGs.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

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Fabrication and Properties of Micro‐ and Nanoscale Metallic Glassy Wires: A Review

2017

Adv Eng Mater

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A large number of metallic glasses (MGs) with high mechanical and functional performance that cannot be achieved by traditional metals in various alloy systems have been developed. At the same time, people realized that micro-and nanoscale wires can improve properties and extend functionality of bulk materials. Therefore, intensive effort has been made to fabricate micro-and nanoscale MG wires, and study their mechanical and physical behavior to achieve high performance. This article reviews fabrication, properties and applications of the wires, and presents technical and theoretical challenges, which must be tackled to achieve high-performance MG wire devices and understand physical mechanisms of mechanical and functional behaviors of the wires.

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Low‐Iridium‐Content IrNiTa Metallic Glass Films as Intrinsically Active Catalysts for Hydrogen Evolution Reaction

Wang

et al. 2019

Advanced Materials

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Although various catalytic materials have emerged for hydrogen evolution reaction (HER), it remains crucial to develop intrinsically effective catalysts with minimum uses of expensive and scarce precious metals. Metallic glasses (MGs) or amorphous alloys show up as attractive HER catalysts, but have so far limited to material forms and compositions that result in high precious‐metal loadings. Here, an Ir25Ni33Ta42 MG nanofilm exhibiting high intrinsic activity and superior stability at an ultralow Ir loading of 8.14 µg cm−2 for HER in 0.5 m H2SO4 is reported. With an overpotential of 99 mV for a current density of 10 mA cm−2, a small Tafel slope of 35 mV dec−1, and high turnover frequencies of 1.76 and 19.3 H2 s−1 at 50 and 100 mV overpotentials, the glassy film is among the most intrinsically active HER catalysts, outcompetes any reported MG, representative sulfides, and phosphides, and compares favorably with other precious‐metal‐containing catalysts. The outstanding HER performance of the Ir25Ni33Ta42 MG film is attributed to the synergistic effect of the novel alloy system and amorphous structure, which may inspire the development of multicomponent alloys for heterogeneous catalysis.

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Oxide-derived nanostructured metallic-glass electrodes for efficient electrochemical hydrogen generation

Abstract: Nanostructured materials with large surface areas are continuing to be at the forefront of catalytic applications.

Cited by 18 publications

References 36 publications

Functional Applications of Metallic Glasses in Electrocatalysis

Functional Applications of Metallic Glasses in Electrocatalysis

Fabrication and Properties of Micro‐ and Nanoscale Metallic Glassy Wires: A Review

Low‐Iridium‐Content IrNiTa Metallic Glass Films as Intrinsically Active Catalysts for Hydrogen Evolution Reaction

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