Co single-atoms on ultrathin N-doped porous carbon via a biomass complexation strategy for high performance metal–air batteries

2020 ◽  
Vol 8 (4) ◽  
pp. 2131-2139 ◽  
Author(s):  
Yanqiu Wang ◽  
Baoying Yu ◽  
Kang Liu ◽  
Xuetao Yang ◽  
Min Liu ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Single Atom ◽  
Single Atoms ◽  
Air Battery ◽  
Cycle Efficiency

A scalable Co single-atom catalyst was fabricated by a biomass complexation strategy, and exhibits high cycle efficiency in a Zn–air battery.

Photoinduced Synergistic Catalysis on Zn Single-Atom-Loaded Hierarchical Porous Carbon for Highly Efficient CO2 Cycloaddition Conversion

2021 ◽  
Author(s):  
Lin Gong ◽  
Ji Sun ◽  
Yousong Liu ◽  
Guangcheng Yang
Keyword(s):  
Solar Energy ◽  
Porous Carbon ◽  
Single Atom ◽  
Hierarchical Porous Carbon ◽  
Reaction Conditions ◽  
Synergistic Catalysis ◽  
Single Atoms ◽  
Significant Challenge ◽  
Highly Efficient ◽  
Hierarchical Porous

The use of solar energy to drive efficient CO2 cycloaddition conversion under mild reaction conditions is highly desired but remains a significant challenge. In this communication, a Zn single-atoms-loaded N-doped...

Single-Atom Oxygen Reduction Reaction Electrocatalysts of Fe, Si, and N co-doped Carbon with 3D Interconnected Mesoporosity

2021 ◽  
Author(s):  
Hee Soo Kim ◽  
CHI HO LEE ◽  
Jue-Hyukk Jang ◽  
Min Seok Kang ◽  
Haneul Jin ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Reduction Reaction ◽  
Anion Exchange Membrane ◽  
Single Atom ◽  
Air Battery ◽  
Orr Activity ◽  
Exchange Membrane ◽  
Co Doped

Development of non Pt-based catalysts (non-PBCs) that show excellent oxygen reduction reaction (ORR) activity for high-performance Zn-air battery (ZAB) and anion exchange membrane fuel cell (AEMFC) is highly necessitated. Here,...

Anchoring Copper Single Atoms on Porous Boron Nitride Nanofiber to Boost Selective Reduction of Nitroaromatics

2021 ◽  
Author(s):  
Jianli Liang ◽  
Qianqian Song ◽  
Jianghua Wu ◽  
Qi Lei ◽  
Zhongming Huang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Performance ◽  
Selective Reduction ◽  
Dark Field ◽  
Single Atom ◽  
Single Atoms ◽  
Annular Dark Field ◽  
Cu Catalyst ◽  
Calcination Method ◽  
Turn Over Frequency

Abstract Single atom catalysts have received widespread attention for their fascinating performance in terms of metal atom efficiency as well as their unique catalysis mechanisms comparing to conventional catalysts. Here, we prepared a high-performance catalyst of single-Cu-atom-decorated boron nitride nanofibers (BNNF-Cu) via a facile calcination method for the first time. The as-prepared catalyst shows excellent catalytic activity and good stability for converting different nitro compounds into their corresponding amines both with and without photoexcitation. By combined studies using synchrotron radiation analysis, high-resolution high-angle annular dark-field transmission electron microscopy studies and DFT calculation, dispersion and coordination of Cu atoms as well as their catalytic mechanisms are explored. The BNNF-Cu catalyst is found to have a record high turn-over frequency comparing to previously reported nonprecious-metal-based catalysts. While the performance of the BNNF-Cu catalyst is only of the middle range level among the state-of-the-art precious-metal-based catalysts, due to the much lower cost of the BNNF-Cu catalyst, its cost-efficiency is the highest among these catalysts. This work provides a new choice of support material which can promote the development of single atoms catalysts.

Palladium single atoms supported by interwoven carbon nanotube and manganese oxide nanowire networks for enhanced electrocatalysis

2018 ◽  
Vol 6 (46) ◽  
pp. 23366-23377 ◽  
Author(s):  
Weikai Xiang ◽  
Yonghui Zhao ◽  
Zheng Jiang ◽  
Xiaopeng Li ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Manganese Oxide ◽  
High Performance ◽  
Cycling Stability ◽  
Single Atoms ◽  
Enhanced Activity ◽  
Air Battery ◽  
Nanowire Networks

The synergy between Pd atoms, CNT and MnO2 gives rises to significantly enhanced activity, selectivity and stability of Pd/MnO2–CNT for oxygen electrocatalysis. The assembled rechargeable metal air battery delivered high performance with enhanced cycling stability.

scholarly journals Nanowrinkled Carbon Aerogels Embedded with FeNx Sites as Effective Oxygen Electrodes for Rechargeable Zinc-Air Battery

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Ting He ◽  
Bingzhang Lu ◽  
Yang Chen ◽  
Yong Wang ◽  
Yaqiang Zhang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Rational Design ◽  
Single Atom ◽  
Carbon Aerogels ◽  
Highly Active ◽  
Structural Distortions ◽  
Oxygen Electrodes ◽  
A Minor ◽  
X Ray Absorption

Rational design of single-metal atom sites in carbon substrates by a flexible strategy is highly desired for the preparation of high-performance catalysts for metal-air batteries. In this study, biomass hydrogel reactors are utilized as structural templates to prepare carbon aerogels embedded with single iron atoms by controlled pyrolysis. The tortuous and interlaced hydrogel chains lead to the formation of abundant nanowrinkles in the porous carbon aerogels, and single iron atoms are dispersed and stabilized within the defective carbon skeletons. X-ray absorption spectroscopy measurements indicate that the iron centers are mostly involved in the coordination structure of FeN4, with a minor fraction (ca. 1/5) in the form of FeN3C. First-principles calculations show that the FeNx sites in the Stone-Wales configurations induced by the nanowrinkles of the hierarchically porous carbon aerogels show a much lower free energy than the normal counterparts. The resulting iron and nitrogen-codoped carbon aerogels exhibit excellent and reversible oxygen electrocatalytic activity, and can be used as bifunctional cathode catalysts in rechargeable Zn-air batteries, with a performance even better than that based on commercial Pt/C and RuO2 catalysts. Results from this study highlight the significance of structural distortions of the metal sites in carbon matrices in the design and engineering of highly active single-atom catalysts.

scholarly journals Isolated Ni single atoms in graphene nanosheets for high-performance CO2 reduction

2018 ◽  
Vol 11 (4) ◽  
pp. 893-903 ◽  
Author(s):  
Kun Jiang ◽  
Samira Siahrostami ◽  
Tingting Zheng ◽  
Yongfeng Hu ◽  
Sooyeon Hwang ◽  
...  
Keyword(s):  
High Performance ◽  
Graphene Nanosheets ◽  
Co2 Reduction ◽  
Membrane Electrode Assembly ◽  
Single Atom ◽  
Membrane Electrode ◽  
Single Atoms

High-performance electrocatalytic CO2 reduction to CO using Ni single-atom catalyst in an anion membrane electrode assembly.

scholarly journals Isolated Ni single atoms in nitrogen doped ultrathin porous carbon templated from porous g-C3N4 for high-performance CO2 reduction

Nano Energy ◽  
2020 ◽  
Vol 77 ◽  
pp. 105158 ◽  
Author(s):  
Yan Lu ◽  
Haojing Wang ◽  
Pengfei Yu ◽  
Yifei Yuan ◽  
Reza Shahbazian-Yassar ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Co2 Reduction ◽  
Nitrogen Doped ◽  
Single Atoms

Bimetallic Conjugated Microporous Polymer Derived B, N-doped Porous Carbon Wrapped Co3Fe7 alloy Composite as Bifunctional Oxygen Electrocatalyst for Zn-air battery

2021 ◽  
Author(s):  
Jinli Dou ◽  
Hantian Luo ◽  
Chunli Zhang ◽  
Jingjing Lu ◽  
Xiujuan Luan ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Evolution ◽  
Porous Carbon ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Reduction Reaction ◽  
Alloy Composite ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Air Battery

The exploration and development of high-performance, durable, and economic bifunctional electrocatalysts towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential but challenging for the development of rechargeable...

Tunable Carbon Surface from Mono- to Multi-Metallic Single Atoms

2020 ◽  
Author(s):  
Weihong Lai ◽  
Heng Wang ◽  
Quan jiang ◽  
Zichao Yan ◽  
Hanwen Liu ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Structural Evolution ◽  
Charge Compensation ◽  
Catalytic Reactions ◽  
Single Atom ◽  
Carbon Surface ◽  
Hydrogen Electrode ◽  
Single Atoms ◽  
Mass Activity ◽  
Co Doped

<p>Herein, we develop a non-selective charge compensation strategy to prepare multi-single-atom doped carbon (MSAC) in which a sodium p-toluenesulfonate (PTS-Na) doped polypyrrole (S-PPy) polymer is designed to anchor discretionary mixtures of multiple metal cations, including iron (Fe<sup>3+</sup>), cobalt (Co<sup>3+</sup>), ruthenium (Ru<sup>3+</sup>), palladium (Pd<sup>2+</sup>), indium (In<sup>3+</sup>), iridium (Ir<sup>2+</sup>), and platinum (Pt<sup>2+</sup>) . As illustrated in Figure 1, the carbon surface can be tuned with different level of compositional complexities, including unary Pt<sub>1</sub>@NC, binary (MSAC-2, (PtFe)<sub>1</sub>@NC), ternary (MSAC-3, (PtFeIr)<sub>1</sub>@NC), quaternary (MSAC-4, (PtFeIrRu)<sub>1</sub>@NC), quinary (MSAC-5, (PtFeIrRuCo)<sub>1</sub>@NC), senary (MSAC-6, (PtFeIrRuCoPd)<sub>1</sub>@NC), and septenary (MSAC-7, (PtFeIrRuCoPdIn)<sub>1</sub>@NC) samples. The structural evolution of carbon surface dictates the activities of both ORR and HER. The senary MSAC-6 achieves the ORR mass activity of 18.1 A·mg<sub>metal</sub><sup>-1</sup> at 0.9 V (Vs reversible hydrogen electrode (RHE)) over 30K cycles, which is 164 times higher than that of commercial Pt/C. The quaternary MSAC-4 presented a comparable HER catalytic capability with that of Pt/C. These results indicate that the highly complexed carbon surface can enhance its ability over general electrochemical catalytic reactions. The mechanisms regarding of the ORR and HER activities of the alternated carbon surface are also theoretically and experimentally investigated in this work, showing that the synergistic effects amongst the co-doped atoms can activate or inactivate certain single-atom sites.</p>

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