scholarly journals Conversion of Spent Coffee Beans to Electrode Material for Vanadium Redox Flow Batteries

Batteries ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 56 ◽  
Author(s):  
Vida Krikstolaityte ◽  
Oh Joshua ◽  
Andrei Veksha ◽  
Nyunt Wai ◽  
Grzegorz Lisak ◽  
...  
Keyword(s):  
Surface Area ◽  
Electrode Material ◽  
Low Cost ◽  
Redox Flow Batteries ◽  
Graphite Plate ◽  
Coffee Beans ◽  
Flow Batteries ◽  
Activation Times ◽  
Vanadium Redox ◽  
Kinetics Of

This study presents the application of pyrolyzed spent coffee beans as a potential electrode material to replace commercial bipolar graphite plate in vanadium redox flow batteries (VRB). The results indicate that the biochar obtained from spent coffee beans shows relatively good electrochemical charge transfer kinetics of vanadium redox reactions as well as generates higher energy and voltage efficiency in a static cell test when compared to TF6 bipolar graphite plate. Additionally, the biochar was activated via steam at various activation times to increase its surface area, and their effect on the kinetics of the electrochemical reactions was investigated. The activated carbon did not exhibit any improvement neither in electron transfer kinetics nor in the battery efficiency, despite their increased surface area. The performed studies demonstrate that the biochar obtained from spent coffee beans can be a low-cost electrode material for VRB with improved performance characteristics.

Sal wood sawdust derived highly mesoporous carbon as prospective electrode material for vanadium redox flow batteries

2019 ◽  
Vol 834 ◽  
pp. 94-100 ◽  
Author(s):  
Makhan Maharjan ◽  
Nyunt Wai ◽  
Andrei Veksha ◽  
Apostolos Giannis ◽  
Tuti Mariana Lim ◽  
...  
Keyword(s):  
Electrode Material ◽  
Mesoporous Carbon ◽  
Redox Flow Batteries ◽  
Wood Sawdust ◽  
Flow Batteries ◽  
Vanadium Redox

Electrodeposited reduced graphene oxide as a highly efficient and low-cost electrocatalyst for vanadium redox flow batteries

2019 ◽  
Vol 297 ◽  
pp. 31-39 ◽  
Author(s):  
Pooria Moozarm Nia ◽  
Ebrahim Abouzari-Lotf ◽  
Pei Meng Woi ◽  
Yatimah Alias ◽  
Teo Ming Ting ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Low Cost ◽  
Redox Flow Batteries ◽  
Highly Efficient ◽  
Reduced Graphene ◽  
Flow Batteries ◽  
Vanadium Redox

Three-dimensional annealed WO3 nanowire/graphene foam as an electrocatalytic material for all vanadium redox flow batteries

2017 ◽  
Vol 1 (10) ◽  
pp. 2091-2100 ◽  
Author(s):  
Daniel Manaye Kabtamu ◽  
Yu-Chung Chang ◽  
Guan-Yi Lin ◽  
Anteneh Wodaje Bayeh ◽  
Jian-Yu Chen ◽  
...  
Keyword(s):  
Graphene Sheet ◽  
Tungsten Trioxide ◽  
Low Cost ◽  
Three Dimensional ◽  
Graphene Foam ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

This paper presents a three-dimensional annealed tungsten trioxide nanowire/graphene sheet (3D annealed WO3 NWs/GS) foam as an excellent and low-cost electrocatalyst.

Gradient-microstructural porous graphene gelatum/flexible graphite plate integrated electrode for vanadium redox flow batteries

2020 ◽  
Vol 45 (1) ◽  
pp. 916-923 ◽  
Author(s):  
Minghua Jing ◽  
Chunling Zhang ◽  
Xiaochen Qi ◽  
Yuxuan Yang ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Porous Graphene ◽  
Redox Flow Batteries ◽  
Graphite Plate ◽  
Flow Batteries ◽  
Flexible Graphite ◽  
Vanadium Redox

Synergistic effects of a TiNb2O7–reduced graphene oxide nanocomposite electrocatalyst for high-performance all-vanadium redox flow batteries

2018 ◽  
Vol 6 (28) ◽  
pp. 13908-13917 ◽  
Author(s):  
Anteneh Wodaje Bayeh ◽  
Daniel Manaye Kabtamu ◽  
Yu-Chung Chang ◽  
Guan-Cheng Chen ◽  
Hsueh-Yu Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
High Performance ◽  
Freeze Drying ◽  
Synergistic Effects ◽  
Low Cost ◽  
Redox Flow Batteries ◽  
Reduced Graphene ◽  
Flow Batteries ◽  
Vanadium Redox

In this study, a simple, low-cost, and powerful titanium niobium oxidereduced graphene oxide (TiNb2O7–rGO) nanocomposite electrocatalyst was synthesized through dispersion and blending in aqueous solution followed by freeze-drying and annealing for all-vanadium redox flow batteries (VRFBs).

scholarly journals Exploration of reduced graphene oxide microparticles as electrocatalytic materials in vanadium redox flow batteries

2021 ◽  
Author(s):  
Amira Alazmi ◽  
Charles Wan ◽  
Pedro Costa ◽  
Fikile Brushett
Keyword(s):  
Graphene Oxide ◽  
Critical Point ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Reaction Rates ◽  
Redox Flow Batteries ◽  
Reduced Graphene ◽  
Critical Point Drying ◽  
Flow Batteries ◽  
Vanadium Redox

Augmenting reaction rates on porous carbon electrodes is critical for reducing the cost of all-vanadium redox flow batteries (VRFBs). To this end, reduced graphene oxide (rGO) based carbons hold promise, demonstrating high specific surface area, chemomechanical stability, and electrochemical activity. While initial efforts have shown that rGOs can enhance VRFB performance, the range of unique processing conditions leads to a collection of materials with disparate elemental composition and porous structure, thus obscuring performance-determining characteristics behind redox reactions and frustrating the development of generalizable design principles. Here, we generate rGO electrocatalysts of nearly identical chemical composition but different textures (i.e., surface area and pore structure) by varying the drying step in the graphene synthesis (i.e., vacuum-drying vs. carbon dioxide critical point drying). We apply spectroscopic and electrochemical techniques on the synthesized rGOs, observing a three-fold increase in BET surface area using critical point drying. We subsequently decorate carbon felt electrodes – both pristine and thermally activated – with rGO microparticles via a flow deposition procedure, and evaluate their performance and durability in a VRFB cell. The synthesis approach and findings described in this work inform and complement efforts to advance the material science and engineering of rGO electrocatalysts.

scholarly journals A Low-Crossover and Fast-Kinetics Thiolate Negolyte for Aqueous Redox Flow Batteries

2022 ◽  
Vol 2022 ◽  
pp. 1-11
Author(s):  
Bin Yang ◽  
Zengyue Wang ◽  
Wanwan Wang ◽  
Yi-Chun Lu
Keyword(s):  
Reaction Kinetics ◽  
Large Scale ◽  
Coulombic Efficiency ◽  
Low Cost ◽  
High Capacity ◽  
Fast Kinetics ◽  
Redox Flow Batteries ◽  
Crossover Rate ◽  
Flow Batteries ◽  
Kinetics Of

Aqueous redox flow batteries (ARFBs) are a promising technology for large-scale energy storage. Developing high-capacity and long-cycle negolyte materials is one of major challenges for practical ARFBs. Inorganic polysulfide is promising for ARFBs owing to its low cost and high solubility. However, it suffers from severe crossover resulting in low coulombic efficiency and limited lifespan. Organosulfides are more resistant to crossover than polysulfides owing to their bulky structures, but they suffer from slow reaction kinetics. Herein, we report a thiolate negolyte prepared by an exchange reaction between a polysulfide and an organosulfide, preserving low crossover rate of the organosulfide and high reaction kinetics of the polysulfide. The thiolate denoted as 2-hydroxyethyl disulfide+potassium polysulfide (HEDS+K2S2) shows reduced crossover rate than K2S2, faster reaction kinetics than HEDS, and longer lifespan than both HEDS and K2S2. The 1.5 M HEDS+1.5 M K2S2 static cell demonstrated 96 Ah L-1negolyte over 100 and 200 cycles with a high coulombic efficiency of 99.2% and 99.6% at 15 and 25 mA cm-2, respectively. The 0.5 M HEDS+0.5 M K2S2 flow cell delivered a stable and high capacity of 30.7 Ah L-1negolyte over 400 cycles (691 h) at 20 mA cm-2. This study presents an effective strategy to enable low-crossover and fast-kinetics sulfur-based negolytes for advanced ARFBs.

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