An Acid–Base Battery with Oxygen Electrodes: A Laboratory Demonstration of Electrochemical Power Sources

Weng, Guoming; Li, Chi-Ying Vanessa; Chan, Kwong‐Yu

doi:10.1021/acs.jchemed.8b00901

Cited by 11 publications

(15 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, we fed the desalination channel with 0.5 M NaCl solution, the anolyte was 0.5 M NaCl/0.1 M NaOH, and the catholyte was 0.5 M NaCl/0.1 M HCl solution (Figure a). This was done in order to both enhance cell OCV, , as the anode Nernst potential is reduced to E a 0 = −0.83 V versus SHE in alkaline conditions (Table ) and to increase the concentration of the reactants H + in the catholyte and OH – in the anolyte. Again, we varied both the current density extracted from the cell and the feed water flowrate through the desalination channel from 0.1 to 0.5 mL/min.…”

Section: Resultsmentioning

confidence: 99%

Desalination Fuel Cells with High Thermodynamic Energy Efficiency

Khalla

Atlas

Litster

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

Sustainably-produced hydrogen is currently intensively investigated as an energy carrier to replace fossil fuels. We here characterize an emerging electrochemical cell termed a desalination fuel cell (DFC) that can continuously generate electricity and desalinate water while using hydrogen and oxygen gases as inputs. We investigated two operational modes, a near-neutral pH operation with H2, O2, and feedwater inputs (H2|O2), and a pH-gradient mode with H2, O2, feedwater, acid, and base inputs (H2 + B|O2 + A). We show that our cell can desalinate water with 30 g/L of salt content to near-zero salt concentration, while generating an enormous amount of electricity of up to 8.6 kW h per m3 of treated water when operated in the pH-gradient mode and up to about 1 kW h per m3 for the near-neutral mode. We quantify the thermodynamic energy efficiency of our device in both operational modes, showing that significantly higher efficiency is achievable in the pH-gradient mode, with up to 95.6%. Further, we present results elucidating the key bottlenecks in the DFC process, showing that the cell current and voltage are limited in the near-neutral pH operation due to a lack of H+ to serve as a reactant, and further reinforce the deleterious effect of halide poisoning on the cathode Pt catalyst and cell open circuit voltage. Such findings demonstrate that new fuel cell catalyst materials, tailored for environments associated with water treatment, can unlock yet-improved performance.

show abstract

Section: Resultsmentioning

confidence: 99%

Desalination Fuel Cells with High Thermodynamic Energy Efficiency

Khalla

Atlas

Litster

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…15 For instance, the electrochemistry principles are applied to invent batteries that are less polluting, safe for human health, and convert waste to cleaner energy replacing fossil fuels. 18 The electrochemistry principles are also essential for understanding corrosion. Here we describe the four interdisciplinary electrochemistry STEMlab activities that we have designed.…”

Section: ■ the Electrochemistry Stem-lab Activitiesmentioning

confidence: 99%

Interdisciplinary Electrochemistry STEM-Lab Activities Replacing the Single Disciplinary Electrochemistry Curriculum for Secondary Schools

Karpudewan

Huri

2022

J. Chem. Educ.

View full text Add to dashboard Cite

Transforming the chemistry curriculum to an interdisciplinary perspective is essential for preparing students to meet interdisciplinary career demands and to brace themselves for the challenges of complex environmental and health issues. The study introduces four interdisciplinary electrochemistry STEM-lab activities as an alternative to the single disciplinary electrochemistry laboratory curriculum. The electrochemistry STEM-lab activities are designed considering the learning objectives stated in the curriculum specifications. This enables teachers to seamlessly replace the single disciplinary curriculum, which emphasizes the mastery of chemistry concepts, with the interdisciplinary curriculum that stresses applying the concepts in solving complex multidisciplinary real-world problems. The interdisciplinary curriculum allows students to learn electrochemistry concepts considering the mathematics, engineering, and technology disciplines. During the interdisciplinary electrochemistry STEM-lab activities, secondary school students exhibited collaborative teamwork and communication skills. The activities engage them in science and engineering practices, and engineering design thinking. The activities enforce crossing the boundaries between the STEM disciplines to understand the application of principles to manufacture products in industry. Eventually, the activities engender a meaningful learning context that enhances cognitive and affective outcomes.

show abstract

“…Solid Oxide Fuel Cell [3] and Polymer Electrolyte Membrane FC (PEMFC) [4] are examples of hydrogen-based FC technologies. Recently, some alternative liquid-based FCs are being considered for perspective applications, such as direct ammonia FC [5] and acid-base FC [6]. Among these, PEMFCs, compared to other types of FC, show various advantages.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of a Dual Kalman Filter for the Identification of PEM Fuel Cells in Impedance Spectroscopy Experiments

2019

View full text Add to dashboard Cite

In this paper, the Dual Kalman Filter (DKF) is used for the parametric identification of an RC model of a Polymer Electrolyte Membrane Fuel Cell (FC) stack. The identification is performed for diagnostic purposes, starting from time-domain voltage and current signals in the framework of Electrochemical Impedance Spectroscopy (EIS) tests. Here, the sinusoidal input of the tests makes the identification of DKF parameters challenging. The paper analyzes the filter performance and proposes a possible approach to address the filter tuning to let it work with FC operating either in normal conditions or in the presence of drying and flooding fault conditions, or in fuel starvation mode. The analysis is mainly performed in a simulated environment, where the Fouquet model is used to simulate the FC. Some criteria to tune the filter are derived from the analysis and used also with experimental data produced by some EIS tests, to achieve the best estimate in constrained conditions. The results show that the DKF can be turned into a valuable tool to identify the model parameters even with signals developed for other scopes. The identification results envisage the possibility of assisting the model-based FC diagnosis by means of a very simple tool that can run on a low-cost embedded device. Indeed, the simplicity of the filter approach and a lightweight implementation allow the deployment of the algorithm in embedded solutions.

show abstract

An Acid–Base Battery with Oxygen Electrodes: A Laboratory Demonstration of Electrochemical Power Sources

Cited by 11 publications

References 12 publications

Desalination Fuel Cells with High Thermodynamic Energy Efficiency

Desalination Fuel Cells with High Thermodynamic Energy Efficiency

Interdisciplinary Electrochemistry STEM-Lab Activities Replacing the Single Disciplinary Electrochemistry Curriculum for Secondary Schools

Improving the Performance of a Dual Kalman Filter for the Identification of PEM Fuel Cells in Impedance Spectroscopy Experiments

Contact Info

Product

Resources

About