Quantifying Regeneration in Dye-Sensitized Solar Cells
Quantifying Regeneration in Dye-Sensitized Solar Cells
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DOI：
10.1021/jp1101048
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发表时间：
2011-02-10
影响因子：
3.7
通讯作者：
O'Regan, Brian C.
中科院分区：
文献类型：
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作者：
Anderson, Assaf Y.;Barnes, Piers R. F.;O'Regan, Brian C.
我们提出并应用了一种新的实验方案，通过在操作条件下对全电池进行测量来确定染料敏化太阳能电池（DSSC）中碘化物氧化（又名染料再生）的动力学。激光脉冲后氧化染料的瞬态吸收 (TA) 衰减与 TA 实验期间测量的短路电流 (J(sc)) 和 TiO2 中的电子浓度相关。一系列使用 N719 [(Bu4N)(2)][Ru(dcbpyH)(2)-(NCS)(2)] (dcbpy = 4,4'-二羧基-2,2'-联吡啶)、标准电解质和不同碘化物浓度的电池的结果使我们能够拟合基本再生速率常数 (k(rg) = 7.8 x 10(5)M(-1) s(-1))并确定这些细胞中碘化物的顺序接近 1 (0.98 +/- 0.16)，远不是 2。速率和顺序使我们能够对各种反应机制进行排序，并讨论可被催化以改善再生的可能限速步骤。该方法还可以估计电子染料复合 (EDR) 的基本速率常数和总电子浓度中的表观反应级数。
We propose and apply a new experimental protocol for determining the kinetics of the oxidation of iodide (aka dye regeneration) in dye sensitized solar cells (DSSCs) using measurements on full cells under operating conditions. Transient absorption (TA) decays of the oxidized dye after a laser pulse are correlated with the short circuit current (J(sc)) and electron concentration in the TiO2, measured during the TA experiment. Results for a series of cells with N719 [(Bu4N)(2)][Ru(dcbpyH)(2)-(NCS)(2)] (dcbpy = 4,4'-dicarboxy-2,2'-bipyridyl), a standard electrolyte, and varying iodide concentration allow us to fit for the fundamental regeneration rate constant (k(rg) = 7.8 x 10(5)M(-1) s(-1)) and to determine that the order in iodide, in these cells, is near 1 (0.98 +/- 0.16) and dearly not 2. The rate and order allow us to rank various reaction mechanisms and to discuss possible rate-limiting steps that could be catalyzed to improve regeneration. The method can also give estimates of the fundamental rate constant for electron dye recombination (EDR) and the apparent reaction order in total electron concentration.