การประเมินปฏิกิริยาไฟฟ้าเคมีของแบตเตอรี่การไหลสารอินทรีย์ ใช้น้ำเป็นสารละลาย

Abstract

Organic Redox Flow Battery using aqueous solution is suitable storage with renewable energy or over electrics capacity produce period. The electroactive of this experiment were using Anthraquinone-2-disulfonic acid (AQS) and 1,2-Benzoquinone-3,5-disulfonic acid (BQDS). Firstly, using Cyclic voltammetry technique for evaluate the electrochemical reaction of reversible reaction, standard half-cell reaction and diffusion coefficient. After that, produce the membrane electrode assembly by spray carbon on the membrane for active area 25 cm2 and assembly with the single cell was instructed in house. The cell efficiency were evaluated 3 conditions, flow rate changed at the 100, 175 and 250 ml/min by fixed concentration 0.20M and the 2nd condition, concentration active solution were vary by 0.10, 0.15 and 0.20M and fixed flow rate at the 250 ml/min. In the last condition, to operated run 23 cycles for charging-discharging. The result of electrochemical found that, active material was good reversible process, the standard half-cell showed 0.17V and 0.93V and diffusion coefficient from calculating equal 2.64x10- 6 cm2/s and 1.32x10-6 cm2/s as the sequent of AQS and BQDS. The single cell operation, efficiency followed by the flow rate 100, 175 and 250 ml/min showed result of coulombic and energy efficiency that 64.3%, 76.0%, 77.3% and 31.9%, 42.0%, 43.0% so concluded that high active solution of flow rate is the best. And efficiency of active concentration equal 64.7%, 78.6%, 80.3% and 38.4%, 43.0%, 43.7% of 0.10, 0.15 and 0.20M in the highest concentration is the best. For the cell cycle 23 rounds, coulombic and energy efficiency showed average result at the 97.1% and 37.5% (after 4th cycle)