scholarly journals Investigation of alternative materials as bifunctional catalysts for electrochemical applications

2019 ◽  
Vol 6 (4) ◽  
pp. 120-129 ◽  
Author(s):  
Michael Vayenas ◽  
Christos Vaitsis ◽  
Georgia Sourkouni ◽  
Pavlos K. Pandis ◽  
Christos Argirusis
Keyword(s):  
Reduction Reaction ◽  
Bifunctional Catalysts ◽  
Battery Cell ◽  
Cathode Catalysts ◽  
Custom Made ◽  
Alternative Materials ◽  
Metal Organic ◽  
Air Battery ◽  
Prolonged Discharge

A lab-scale custom made Zinc-Air battery cell was manufactured and tested with a variety of cathode catalysts. MnO2 has been examined both as an Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) catalyst, with more promising results as an ORR catalyst. MnO2 as well as a combination of MnO2 and MWCNTs (MOCN-10) has been examined in this work. In addition, two different Metal Organic Frameworks (MOFs), specifically HKUST-1 and MOF-74, based on Cu and Ni, respectively, were investigated as an alternative and novel cathode catalyst directly on the battery cell. A power output of 20 mW·cm-2 was achieved by using MOCN-10, along with stability in prolonged discharge cycling at 5 mA·cm-2. Furthermore MOF-loaded battery has demonstrated astonishing performance in pulse cycling for more than 120 hours. Moreover no dendrite formation was observed during long term pulse cycling.

Nitrogen and phosphorus co-doped ultrathin carbon nanosheets as superior cathode catalysts of Zn-air battery.

2021 ◽  
Author(s):  
Aling Chen ◽  
Qingfeng Yi ◽  
Kuang Sheng ◽  
Yuebing Wang ◽  
Jiangchuan Chen ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Oxygen Reduction Reaction ◽  
Reduction Reaction ◽  
Nitrogen And Phosphorus ◽  
Carbon Nanosheets ◽  
Cathode Catalysts ◽  
Metal Free ◽  
Air Battery ◽  
Storage Technologies ◽  
Co Doped

Exploring efficient metal-free electrocatalyst for oxygen reduction reaction (ORR) plays a significant role in a variety of storage technologies and renewable energy conversion. In this work, we firstly compounded a...

scholarly journals Electrochemical properties of a rechargeable aluminum–air battery with a metal–organic framework as air cathode material

RSC Advances ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 6389-6395 ◽  
Author(s):  
Ryohei Mori
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Metal Organic Framework ◽  
High Capacity ◽  
Electrochemical Reactions ◽  
Air Cathode ◽  
Metal Organic ◽  
Air Battery ◽  
Charge Discharge

The goal of this study was to develop a rechargeable aluminum–air battery with high capacity and long-term durability in charge–discharge electrochemical reactions.

scholarly journals Remedy for Collapse of ZIF Derived Carbon: Micro-Pore Filled Synthesis to Improve ORR Catalytic Property

2022 ◽  
Author(s):  
Xingxing Wu ◽  
Songwei Zhang ◽  
Jiaojiao Gao ◽  
Xiaopeng Liu ◽  
Qunhui Yuan ◽  
...  
Keyword(s):  
Active Sites ◽  
Metal Organic Framework ◽  
Reduction Reaction ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Pore Filling ◽  
Zeolitic Imidazolate Framework ◽  
Half Wave ◽  
Metal Organic ◽  
Air Battery

Abstract Zeolitic imidazolate framework (ZIF) derived carbons deliver outstanding performance as oxygen reduction reaction (ORR) catalysts. However, their electrocatalytic activities are limited due to unavoidable collapse of ZIFs upon pyrolysis, which results in degradation of porosity, sintering of metals and loss of active sites. In this work, a micro-pore filling strategy was employed to strength the architecture of ZIF by using size matched cyanamide molecules as fillers. The cyanamide with high nitrogen content shows a triple effect in stabilizing the carbonaceous skeleton, preserving of metal containing active sites and improving the conductivity of matrix. Therefore, the as-prepared Fe, Co co-doped ZIF derived carbon (FeCo@NC-N) delivers a significantly improved electrochemical activity for ORR than its unfilled counterpart, with half-wave potential upshifted by 30 mV (0.84 V vs. RHE). Besides, a promoted power density of home-assembled zinc-air battery is obtained when FeCo@NC-N is applied as cathode catalyst. This work demonstrates a reliable approach to mitigate framework collapse of metal organic framework (MOF), thus may open a new way for fabrication of MOF based catalysts with increased loading of pores and active sites.

scholarly journals Atomic ruthenium coordinated with chlorine and nitrogen as efficient and multifunctional electrocatalyst for overall water splitting and rechargeable zinc-air battery

2021 ◽  
Author(s):  
Jianfeng Huang ◽  
Junsheng Chen ◽  
Yongqiang Feng ◽  
Ran Wang ◽  
Weihang Feng ◽  
...  
Keyword(s):  
Water Splitting ◽  
Specific Capacity ◽  
Electrochemical Measurement ◽  
Reduction Reaction ◽  
Single Atom ◽  
Overall Water Splitting ◽  
Energy Conversion And Storage ◽  
Calculation Results ◽  
Air Battery

Abstract Design and fabrication of multifunctional efficient and durable single atom electrocatalyst is highly desirable and challenging for overall water splitting and zinc-air battery. Herein, a novel and efficient ruthenium coordinated with Cl and N single atom catalyst (Ru–Cl–N SAC) was synthesized. X-ray adsorption spectroscopy combined with theoretical calculation results unveiled an atomic configuration of RuCl2N2. Electrochemical measurement disclosed that the Ru–Cl–N SAC exhibited superior electrocatalytic activities toward hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) with low overpotential and long-term durability in alkaline medium. Furthermore, a well-qualified assembly of overall water splitting cell requiring only 1.49 V to achieve a current density of 10 mA cm− 2 and a rechargeable zinc-air battery with a specific capacity of 804.26 mAh g− 1 and long-term durability for 360 h were fabricated based on the Ru–Cl–N SAC. The present work would pave the way for design and fabrication of novel and efficient multifunctional electrocatalyst in the realm of energy conversion and storage.

Nanostructured Perovskite LaCo1-xMnxO3 as Bifunctional Catalysts for Rechargeable Metal–Air Batteries

2015 ◽  
Vol 03 (01n02) ◽  
pp. 1540006 ◽  
Author(s):  
Xiaoming Ge ◽  
Bing Li ◽  
Delvin Wuu ◽  
Afriyanti Sumboja ◽  
Tao An ◽  
...  
Keyword(s):  
Rotating Disk ◽  
Bifunctional Catalyst ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Bifunctional Catalysts ◽  
X Ray Diffraction ◽  
Practical Utilization ◽  
Cathode Catalysts ◽  
Hydrothermal Methods ◽  
Zinc Air Batteries

Bifunctional catalyst that is active for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is one of the most important components of rechargeable metal–air batteries. Nanostructured perovskite bifunctional catalysts comprising La , Co and Mn ( LaCo 1-x Mn x O 3, LCMO ) are synthesized by hydrothermal methods. The morphology, structure and electrochemical activity of the perovskite bifunctional catalysts are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and rotating disk electrode (RDE) techniques. Nanorod, nanodisc and nanoparticle are typical morphologies of LCMO . The electrocatalytic activity of LCMO is significantly improved by the addition of conductive materials such as carbon nanotube. To demonstrate the practical utilization, LCMO in the composition of LaCo 0.8 Mn 0.2 O 3( LCMO82 ) is used as air cathode catalysts for rechargeable zinc–air batteries. The battery prototype can sustain 470 h or 40 discharge–charge cycles equivalent.

Long-Term Stable Metal Organic Framework (MOF) Based Mixed Matrix Membranes for Ultrafiltration

2020 ◽  
Author(s):  
Muayad Al-shaeli ◽  
Stefan J. D. Smith ◽  
Shanxue Jiang ◽  
Huanting Wang ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Mixed Matrix Membranes ◽  
Recovery Ratio ◽  
Mixed Matrix ◽  
Water Contact ◽  
Membrane Performance ◽  
Metal Organic ◽  
Matrix Membranes

<p>In this study, novel <a>mixed matrix polyethersulfone (PES) membranes</a> were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH<sub>2</sub>. The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH<sub>2</sub> nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH<sub>2</sub> are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.</p>

Tuning and understanding the electronic effect of Co-Mo-O sties in bifunctional electrocatalysts for ultralong-lasting rechargable zinc-air battery

2021 ◽  
Author(s):  
Yi Guan ◽  
Nan Li ◽  
Jiao He ◽  
Yongliang Li ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Electronic Effect ◽  
Metal Organic Frameworks ◽  
Core Shell ◽  
Zeolitic Imidazolate Frameworks ◽  
Assembly Strategy ◽  
The Core ◽  
Bifunctional Electrocatalysts ◽  
Metal Organic ◽  
Air Battery

Herein, we report a post-assembly strategy by growing the bimetallic Co/Zn zeolitic imidazolate frameworks (BIMZIF) on the surface of the customized Mo metal-organic frameworks (MOFs) (Mo-MOF) to prepare the core-shell...

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