Radical Charge Population and Energy: Critical Role in Redox Potential and Cycling Life of Piperidine Nitroxyl Radical Cathodes in Aqueous Zinc Hybrid Flow Batteries

2020 ◽  
Vol 12 (39) ◽  
pp. 43568-43575 ◽  
Author(s):  
Hao Fan ◽  
Jiahui Zhang ◽  
Mahalingam Ravivarma ◽  
Hongbin Li ◽  
Bo Hu ◽  
...  
Keyword(s):  
Redox Potential ◽  
Nitroxyl Radical ◽  
Critical Role ◽  
Flow Batteries ◽  
Cycling Life

Theoretical Exploration of 2,2’-Bipyridines as Electro-Active Compounds in Flow Batteries

2019 ◽  
Author(s):  
Mariano Sánchez-Castellanos ◽  
Martha M. Flores-Leonar ◽  
Zaahel Mata-Pinzón ◽  
Humberto G. Laguna ◽  
Karl García-Ruiz ◽  
...  
Keyword(s):  
Redox Potential ◽  
Active Material ◽  
Chemical Properties ◽  
Small Subset ◽  
Solubility In Water ◽  
Protonation Reaction ◽  
Redox Active ◽  
Physico Chemical ◽  
Pka Value ◽  
Flow Batteries

Compounds from the 2,2’-bipyridine molecular family were investigated for use as redox-active materials in organic flow batteries. For 156 2,2’-bipyridine derivatives reported in the academic literature, we calculated the redox potential, the pKa for the first protonation reaction, and the solubility in aqueous solutions. Using experimental data on a small subset of derivatives, we were able to calibrate our calculations. We find that functionalization with electron-withdrawing groups leads to an increase of the redox potential and to an increase of the molecular acidity (as expressed in a reduction of the pKa value for the first protonation step). Furthermore, calculations of solubility in water indicate that some of the studied derivatives have adequate solubility for flow battery applications. Based on an analysis of the physico-chemical properties of the 156 studied compounds, we down-select five molecules with carbonyl- and nitro-based functional groups, whose parameters are especially promising for potential application as negative redox-active material inorganic flow batteries.

Theoretical Exploration of 2,2’-Bipyridines as Electro-Active Compounds in Flow Batteries

2019 ◽  
Author(s):  
Mariano Sánchez-Castellanos ◽  
Martha M. Flores-Leonar ◽  
Zaahel Mata-Pinzón ◽  
Humberto G. Laguna ◽  
Karl García-Ruiz ◽  
...  
Keyword(s):  
Redox Potential ◽  
Active Material ◽  
Chemical Properties ◽  
Small Subset ◽  
Solubility In Water ◽  
Protonation Reaction ◽  
Redox Active ◽  
Physico Chemical ◽  
Pka Value ◽  
Flow Batteries

Compounds from the 2,2’-bipyridine molecular family were investigated for use as redox-active materials in organic flow batteries. For 156 2,2’-bipyridine derivatives reported in the academic literature, we calculated the redox potential, the pKa for the first protonation reaction, and the solubility in aqueous solutions. Using experimental data on a small subset of derivatives, we were able to calibrate our calculations. We find that functionalization with electron-withdrawing groups leads to an increase of the redox potential and to an increase of the molecular acidity (as expressed in a reduction of the pKa value for the first protonation step). Furthermore, calculations of solubility in water indicate that some of the studied derivatives have adequate solubility for flow battery applications. Based on an analysis of the physico-chemical properties of the 156 studied compounds, we down-select five molecules with carbonyl- and nitro-based functional groups, whose parameters are especially promising for potential application as negative redox-active material inorganic flow batteries.

scholarly journals Orbital-dependent redox potential regulation of quinone derivatives for electrical energy storage

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 5164-5173 ◽  
Author(s):  
Zhihui Niu ◽  
Huaxi Wu ◽  
Yihua Lu ◽  
Shiyun Xiong ◽  
Xi Zhu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Redox Potential ◽  
Electrical Energy ◽  
Electrical Energy Storage ◽  
Redox Flow Batteries ◽  
Flow Batteries

Various quinone derivatives are investigated to determine the suitability for application in organic redox-flow batteries.

scholarly journals Solvating power series of electrolyte solvents for lithium batteries

2019 ◽  
Vol 12 (4) ◽  
pp. 1249-1254 ◽  
Author(s):  
Chi-Cheung Su ◽  
Meinan He ◽  
Rachid Amine ◽  
Tomas Rojas ◽  
Lei Cheng ◽  
...  
Keyword(s):  
Power Series ◽  
Redox Potential ◽  
Solid Electrolyte ◽  
Lithium Batteries ◽  
Critical Role ◽  
The Stability

From dictating the redox potential of electrolyte solvents to shaping the stability of solid-electrolyte interfaces, solvation plays a critical role in the electrochemistry of electrolytes.

scholarly journals Multistaged discharge constructing heterostructure with enhanced solid-solution behavior for long-life lithium-oxygen batteries

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Shu-Mao Xu ◽  
Xiao Liang ◽  
Xue-Yan Wu ◽  
Shen-Long Zhao ◽  
Jun Chen ◽  
...  
Keyword(s):  
Charge Transport ◽  
Cathode Surface ◽  
Critical Role ◽  
Cathode Catalysts ◽  
Lithium Peroxide ◽  
Lithium Diffusion ◽  
Large Contact Area ◽  
Main Factors ◽  
Lithium Oxygen Batteries ◽  
Cycling Life

AbstractInferior charge transport in insulating and bulk discharge products is one of the main factors resulting in poor cycling stability of lithium–oxygen batteries with high overpotential and large capacity decay. Here we report a two-step oxygen reduction approach by pre-depositing a potassium carbonate layer on the cathode surface in a potassium–oxygen battery to direct the growth of defective film-like discharge products in the successive cycling of lithium–oxygen batteries. The formation of defective film with improved charge transport and large contact area with a catalyst plays a critical role in the facile decomposition of discharge products and the sustained stability of the battery. Multistaged discharge constructing lithium peroxide-based heterostructure with band discontinuities and a relatively low lithium diffusion barrier may be responsible for the growth of defective film-like discharge products. This strategy offers a promising route for future development of cathode catalysts that can be used to extend the cycling life of lithium–oxygen batteries.

A Viologen-Based Anolyte with a Very Negative Redox Potential for Neutral Aqueous Redox Flow Batteries

2020 ◽  
Vol MA2020-02 (2) ◽  
pp. 305-305
Author(s):  
Meisam Bahari ◽  
Gerald D. Watt ◽  
John N. Harb
Keyword(s):  
Redox Potential ◽  
Redox Flow Batteries ◽  
Flow Batteries

scholarly journals High energy density MnO4−/MnO42− redox couple for alkaline redox flow batteries

2016 ◽  
Vol 52 (97) ◽  
pp. 14039-14042 ◽  
Author(s):  
Alejandro N. Colli ◽  
Pekka Peljo ◽  
Hubert H. Girault
Keyword(s):  
Energy Density ◽  
Redox Potential ◽  
Room Temperature ◽  
High Energy ◽  
Redox Couple ◽  
High Energy Density ◽  
High Solubility ◽  
Redox Flow Batteries ◽  
Electrochemical Reversibility ◽  
Flow Batteries

The MnO4−/MnO42− redox couple has a positive redox potential, high electrochemical reversibility and high solubility, up to 3.62 M at room temperature.

Importance of glucose-6-phosphate dehydrogenase activity in cell death

1999 ◽  
Vol 276 (5) ◽  
pp. C1121-C1131 ◽  
Author(s):  
Wang-Ni Tian ◽  
Leigh D. Braunstein ◽  
Kira Apse ◽  
Jiongdong Pang ◽  
Mark Rose ◽  
...  
Keyword(s):  
Cell Death ◽  
Redox Potential ◽  
Critical Role ◽  
Pentose Phosphate ◽  
Serum Deprivation ◽  
Mitogen Activated Protein Kinase ◽  
Protein Thiols ◽  
Mitogen Activated Protein ◽  
Kinase Phosphorylation ◽  
Glucose 6 Phosphate Dehydrogenase

The intracellular redox potential plays an important role in cell survival. The principal intracellular reductant NADPH is mainly produced by the pentose phosphate pathway by glucose-6-phosphate dehydrogenase (G6PDH), the rate-limiting enzyme, and by 6-phosphogluconate dehydrogenase. Considering the importance of NADPH, we hypothesized that G6PDH plays a critical role in cell death. Our results show that 1) G6PDH inhibitors potentiated H2O2-induced cell death; 2) overexpression of G6PDH increased resistance to H2O2-induced cell death; 3) serum deprivation, a stimulator of cell death, was associated with decreased G6PDH activity and resulted in elevated reactive oxygen species (ROS); 4) additions of substrates for G6PDH to serum-deprived cells almost completely abrogated the serum deprivation-induced rise in ROS; 5) consequences of G6PDH inhibition included a significant increase in apoptosis, loss of protein thiols, and degradation of G6PDH; and 6) G6PDH inhibition caused changes in mitogen-activated protein kinase phosphorylation that were similar to the changes seen with H2O2. We conclude that G6PDH plays a critical role in cell death by affecting the redox potential.

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