Highly doped and exposed Cu(i)–N active sites within graphene towards efficient oxygen reduction for zinc–air batteries

2016 ◽  
Vol 9 (12) ◽  
pp. 3736-3745 ◽  
Author(s):  
Haihua Wu ◽  
Haobo Li ◽  
Xinfei Zhao ◽  
Qingfei Liu ◽  
Jing Wang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
High Performance ◽  
High Density ◽  
Catalyst Loading ◽  
Zinc Air Batteries

High-density coordination unsaturated copper(i)–nitrogen embedded in graphene demonstrates a high performance and stability in primary zinc–air batteries with ultralow catalyst loading.

Edge-Segregated Ternary Pd-Pt-Ni Spiral Nanosheets as High-Performance Bifunctional Oxygen Redox Electrocatalysts for Rechargeable Zinc−Air Batteries

2022 ◽  
Author(s):  
Kai Liu ◽  
Hongpu Huang ◽  
Yuxin Zhu ◽  
Zixi Lyu ◽  
Shupeng Wang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
High Performance ◽  
Rational Design ◽  
Bifunctional Electrocatalysts ◽  
Working Efficiency ◽  
Zinc Air Batteries

Rational design of high-perfomance bifunctional electrocatalysts to simultaneously accelerate the sluggish reversible oxygen reduction and evolution reactions (ORR and OER) is an enormous challenge that restricts the working efficiency and...

In situ derived Fe/N/S-codoped carbon nanotubes from ZIF-8 crystals as efficient electrocatalysts for the oxygen reduction reaction and zinc–air batteries

2018 ◽  
Vol 6 (41) ◽  
pp. 20093-20099 ◽  
Author(s):  
Huihui Jin ◽  
Huang Zhou ◽  
Wenqiang Li ◽  
Zhihao Wang ◽  
Jinlong Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Hydrazine Hydrate ◽  
Oxygen Reduction ◽  
High Performance ◽  
Reduction Reaction ◽  
Zinc Air Batteries

Hydrazine hydrate was employed to prevent Fe agglomeration and sulphate ions were used as the S source, which together led to Fe/N/S-CNTs with high performance.

Investigation of Carbon Composition for Electrochemical Properties as PEMFC Cathode Catalyst

2019 ◽  
Vol 964 ◽  
pp. 13-18 ◽  
Author(s):  
Vuri Ayu Setyowati ◽  
Diah Susanti ◽  
Lukman Noerochim ◽  
Eriek Wahyu Restu Widodo ◽  
Mohammad Yusuf Sulaiman
Keyword(s):  
Electrochemical Properties ◽  
Oxygen Reduction ◽  
Active Sites ◽  
High Performance ◽  
Reduction Reaction ◽  
Chemical Compositions ◽  
Cathode Catalyst ◽  
Large Area ◽  
X Ray ◽  
Carbon Composition

Nitrogen –doped carbon material using non-precious metal was developed as catalyst fuel cell (PEMFC). In the PEMFC, the cathode reaction occurs three times slower than anode reaction. Oxygen reduction reaction (ORR) in the cathode has major limit performance. Pt/C was used as high-cost catalyst materials but many researchers concerned to improve cathode catalyst performance using high-performance and low-cost materials. Nitrogen based active sites on carbon has important role for oxygen reduction reactions process. In this study, compositions of carbon for Fe-N-C were investigated to understand the electrochemical properties and morphological analysis. Urea and PVP as nitrogen (N) source was mixed with graphite (Gt). The ratio of Gt and N were 1:1, 3:1, and 1:3. The mixture was added to FeCl3.6H2O dissolved in ethanol to produce Fe-N/C catalyst. Subsequently powder was introduced to the furnace for the pyrolysis. The catalyst products were analyzed using Potentiostat to show the electrochemical properties of catalyst, X-Ray Diffractometer (XRD) was used to know the compound or phases after catalyst syntheses, Scanning Electron Microscope – Energy Dispersive X-Ray (SEM-EDX) was used to identify the morphology and the chemical compositions of catalyst. As a result, Fe – Gt : N = 1:3 catalyst had the greatest electrochemical properties which is identified by large area of CV curve. This catalyst also had the highest current density for reduction reaction. The presence of Fe2O3 and FeS caused the degreasing of catalytic activity. As conclusions of this research, carbon composition had the important rule to improve the ORR activity.

Rational design of a highly mesoporous Fe–N–C/Fe3C/C–S–C nanohybrid with dense active sites for superb electrocatalysis of oxygen reduction

2020 ◽  
Vol 8 (44) ◽  
pp. 23436-23454
Author(s):  
Ahmed Al-Shahat Eissa ◽  
Nam Hoon Kim ◽  
Joong Hee Lee
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Sites ◽  
High Performance ◽  
Rational Design ◽  
Reduction Reaction ◽  
Single Step

A high-performance and sustainable electrocatalyst for the oxygen reduction reaction is fabricated by a single-step doping/annealing strategy.

Continuous fabrication of a MnS/Co nanofibrous air electrode for wide integration of rechargeable zinc–air batteries

Nanoscale ◽  
2017 ◽  
Vol 9 (41) ◽  
pp. 15865-15872 ◽  
Author(s):  
Yang Wang ◽  
Jing Fu ◽  
Yining Zhang ◽  
Matthew Li ◽  
Fathy Mohamed Hassan ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
High Performance ◽  
Air Electrode ◽  
Highly Efficient ◽  
Bifunctional Electrocatalysts ◽  
Continuous Fabrication ◽  
Zinc Air Batteries

Exploring highly efficient bifunctional electrocatalysts toward the oxygen reduction and evolution reactions is essential for the realization of high-performance rechargeable zinc–air batteries.

scholarly journals Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3198
Author(s):  
Syed Fakhar Alam ◽  
Min-Zy Kim ◽  
Aafaq ur Rehman ◽  
Devipriyanka Arepalli ◽  
Pankaj Sharma ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Molecular Sieves ◽  
Active Sites ◽  
High Performance ◽  
Hydrothermal Process ◽  
Acid Sites ◽  
High Density ◽  
Structure Directing Agent ◽  
Transfer Resistance ◽  
Low Mass

Two-dimensional SAPO-34 molecular sieves were synthesized by microwave hydrothermal process. The concentrations of structure directing agent (SDA), phosphoric acid, and silicon in the gel solution were varied and their effect on phase, shape, and composition of synthesized particles was studied. The synthesized particles were characterized by various techniques using SEM, XRD, BET, EDX, and NH3-TPD. Various morphologies of particles including isotropic, hyper rectangle, and nanoplates were obtained. It was found that the Si/Al ratio of the SAPO-34 particles was in a direct relationship with the density of acid sites. Moreover, the gel composition and preparation affected the chemistry of the synthesized particles. The slow addition of phosphoric acid improved the homogeneity of synthesis gel and resulted in SAPO-34 nanoplates with high density of acid sites, 3.482 mmol/g. The SAPO-34 nanoplates are expected to serve as a high performance catalyst due to the low mass transfer resistance and the high density of active sites.

Two dimensional ZIF-derived ultra-thin Cu–N/C nanosheets as high performance oxygen reduction electrocatalysts for high-performance Zn–air batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (26) ◽  
pp. 14259-14266 ◽  
Author(s):  
Yi Guan ◽  
Nan Li ◽  
Yongliang Li ◽  
Lingna Sun ◽  
Yuan Gao ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
High Performance ◽  
Two Dimensional ◽  
Great Contribution

Cu–N–C active sites make a great contribution to the activity of 2D-ZIF derived electrocatalysts.

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