scholarly journals Amorphizing noble metal for single-atom-layer catalysis

2020 ◽  
Author(s):  
Yongmin He ◽  
Liren Liu ◽  
Chao Zhu ◽  
Prafful Golani ◽  
Bonhyeong Koo ◽  
...  
Keyword(s):  
Current Density ◽  
Noble Metals ◽  
Rational Design ◽  
High Current Density ◽  
Amorphous Layer ◽  
Industrial Applications ◽  
Atomic Scale ◽  
Utilization Efficiency ◽  
Single Atom ◽  
Atom Layer

Abstract Rational design of noble catalysts with a potential to leverage efficiency at the atomic scale is vital for industrial applications. Such an ultimate atom-utilization efficiency can be achieved when all noble atoms exclusively contribute to catalysis. Here, we demonstrate a scalable synthesis of freestanding amorphous PtSex (where 1.2 < x < 1.3) layers acting as single-atom-layer of Pt catalysts with an unprecedentedly high atom-utilization efficiency (~ 30 wt%) at the monolayer limit. The amorphous PtSex behaviors a fully-activated surface accessible to catalytic reactions. The catalytic performance of the amorphous layer is featured by a nearly 100% current density relative to a pure Pt surface and reliable production of sustained high-flux hydrogen over a 2-inch sized wafer sample as a proof-of-concept. Furthermore, an electrolyser using the PtSex amorphous layer as a cathode is demonstrated to generate a high current density of 1000 mA cm− 2. Such an amorphization strategy is potentially extendable to other noble metals, including Pd, Ir, Os, Rh, and Ru elements, demonstrating the universality of single-atom-layer catalysts.

Design of Aligned Porous Carbon Films with Single‐Atom Co–N–C Sites for High‐Current‐Density Hydrogen Generation

2021 ◽  
pp. 2103533
Author(s):  
Rui Liu ◽  
Zhichao Gong ◽  
Jianbin Liu ◽  
Juncai Dong ◽  
Jiangwen Liao ◽  
...  
Keyword(s):  
Current Density ◽  
Porous Carbon ◽  
Hydrogen Generation ◽  
High Current Density ◽  
Carbon Films ◽  
Single Atom ◽  
High Current

Rational design of low loading Pd-Alloyed Ag nanocorals for high current density CO2-to-CO electroreduction at elevated Pressure

2021 ◽  
pp. 100923
Author(s):  
Samah A. Mahyoub ◽  
Fahim A. Qaraah ◽  
Shenglin Yan ◽  
Abdo Hezam ◽  
Juhua Zhong ◽  
...  
Keyword(s):  
Current Density ◽  
Rational Design ◽  
High Current Density ◽  
Elevated Pressure ◽  
High Current

Corrosion and Alloy Engineering in Rational Design of High Current Density Electrodes for Efficient Water Splitting

2020 ◽  
Vol 10 (24) ◽  
pp. 1904020 ◽  
Author(s):  
Vasanth Rajendiran Jothi ◽  
Karuppasamy Karuppasamy ◽  
Thandavarayan Maiyalagan ◽  
Hashikaa Rajan ◽  
Chi‐Young Jung ◽  
...  
Keyword(s):  
Water Splitting ◽  
Current Density ◽  
Rational Design ◽  
High Current Density ◽  
High Current

Rational design of transition metal single-atom electrocatalysts: a simulation-based, machine learning-accelerated study

2020 ◽  
Vol 8 (37) ◽  
pp. 19290-19299
Author(s):  
Lianping Wu ◽  
Tian Guo ◽  
Teng Li
Keyword(s):  
Machine Learning ◽  
Transition Metal ◽  
Rational Design ◽  
Utilization Efficiency ◽  
Single Atom ◽  
Simulation Based ◽  
New Research

With maximum atom-utilization efficiency, single atom catalysts (SACs) are surging as a new research frontier in catalysis science.

scholarly journals Mechanistic insight into the active centers of single/dual-atom Ni/Fe-based oxygen electrocatalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenchao Wan ◽  
Yonggui Zhao ◽  
Shiqian Wei ◽  
Carlos A. Triana ◽  
Jingguo Li ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Rational Design ◽  
Reduction Reaction ◽  
Utilization Efficiency ◽  
Single Atom ◽  
Active Centers ◽  
Half Wave ◽  
Fe Sites ◽  
Dual Atom ◽  
Dual Site

AbstractSingle-atom catalysts with maximum metal utilization efficiency show great potential for sustainable catalytic applications and fundamental mechanistic studies. We here provide a convenient molecular tailoring strategy based on graphitic carbon nitride as support for the rational design of single-site and dual-site single-atom catalysts. Catalysts with single Fe sites exhibit impressive oxygen reduction reaction activity with a half-wave potential of 0.89 V vs. RHE. We find that the single Ni sites are favorable to promote the key structural reconstruction into bridging Ni-O-Fe bonds in dual-site NiFe SAC. Meanwhile, the newly formed Ni-O-Fe bonds create spin channels for electron transfer, resulting in a significant improvement of the oxygen evolution reaction activity with an overpotential of 270 mV at 10 mA cm−2. We further reveal that the water oxidation reaction follows a dual-site pathway through the deprotonation of *OH at both Ni and Fe sites, leading to the formation of bridging O2 atop the Ni-O-Fe sites.

scholarly journals Water Splitting: Corrosion and Alloy Engineering in Rational Design of High Current Density Electrodes for Efficient Water Splitting (Adv. Energy Mater. 24/2020)

2020 ◽  
Vol 10 (24) ◽  
pp. 2070107
Author(s):  
Vasanth Rajendiran Jothi ◽  
Karuppasamy Karuppasamy ◽  
Thandavarayan Maiyalagan ◽  
Hashikaa Rajan ◽  
Chi‐Young Jung ◽  
...  
Keyword(s):  
Water Splitting ◽  
Current Density ◽  
Rational Design ◽  
High Current Density ◽  
High Current ◽  
Energy Mater

Double-atom catalysts for energy-related electrocatalysis applications: a theoretical perspective

2022 ◽  
Author(s):  
Donghai Wu ◽  
Bingling He ◽  
Yuanyuan Wang ◽  
Peng Lv ◽  
Dongwei Ma ◽  
...  
Keyword(s):  
Rational Design ◽  
Synergetic Effect ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Atomic Scale ◽  
Theoretical Research ◽  
Single Atom ◽  
Research Attention ◽  
Wide Range ◽  
Electrocatalytic Reactions

Abstract Due to the excellent activity, selectivity, and stability, atomically dispersed metal catalysts with well-defined structures have attracted intensive research attention. As the extension of single-atom catalyst (SAC), double-atom catalyst (DAC) has recently emerged as a research focus. Compared with SAC, the higher metal loading, more complicated and flexible active site, easily tunable electronic structure, and the synergetic effect between two metal atoms could provide DACs with better catalytic performance for a wide range of catalytic reactions. This review aims to summarize the recent advance in theoretical research on DACs for diverse energy-related electrocatalytic reactions. It starts with a brief introduction to DACs. Then an overview of the main experimental synthesis strategies of DACs is provided. Emphatically, the catalytic performance together with the underlying mechanism of the different electrocatalytic reactions, including nitrogen reduction reaction, carbon dioxide reduction reaction, oxygen reduction reaction, and oxygen and hydrogen evolution reactions, are highlighted by discussing how the outstanding attributes mentioned above affect the reaction pathway, catalytic activity, and product selectivity. Finally, the opportunities and challenges for the development of DACs are prospected to shed fresh light on the rational design of more efficient catalysts at the atomic scale in the future.

Microstructure Development in a High Current Density NbTi Superconducting Composite

1985 ◽  
Vol 43 ◽  
pp. 186-189
Author(s):  
P. J. Lee ◽  
D. C. Larbalestier
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Cold Drawing ◽  
Heat Treatments ◽  
Grain Structure ◽  
Fine Grain ◽  
Boundary Film ◽  
Quantitative Basis ◽  
Cold Worked ◽  
Very High

Several features of the metallurgy of superconducting composites of Nb-Ti in a Cu matrix are of interest. The cold drawing strains are generally of order 8-10, producing a very fine grain structure of diameter 30-50 nm. Heat treatments of as little as 3 hours at 300 C (∼ 0.27 TM) produce a thin (1-3 nm) Ti-rich grain boundary film, the precipitate later growing out at triple points to 50-100 nm dia. Further plastic deformation of these larger a-Ti precipitates by strains of 3-4 produces an elongated ribbon morphology (of order 3 x 50 nm in transverse section) and it is the thickness and separation of these precipitates which are believed to control the superconducting properties. The present paper describes initial attempts to put our understanding of the metallurgy of these heavily cold-worked composites on a quantitative basis. The composite studied was fabricated in our own laboratory, using six intermediate heat treatments. This process enabled very high critical current density (Jc) values to be obtained. Samples were cut from the composite at many processing stages and a report of the structure of a number of these samples is made here.

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