当前位置：
X-MOL 学术
›
J. Am. Chem. Soc.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Observation of Photovoltaic Action from Photoacid-Modified Nafion Due to Light-Driven Ion Transport
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-05-15 , DOI: 10.1021/jacs.7b00974 William White 1 , Christopher D. Sanborn 1 , Ronald S. Reiter 1 , David M. Fabian 1 , Shane Ardo 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-05-15 , DOI: 10.1021/jacs.7b00974 William White 1 , Christopher D. Sanborn 1 , Ronald S. Reiter 1 , David M. Fabian 1 , Shane Ardo 1
Affiliation
|
Replacing passive ion-exchange membranes, like Nafion, with membranes that use light to drive ion transport would allow membranes in photoelectrochemical technologies to serve in an active role. Toward this, we modified perfluorosulfonic acid ionomer membranes with organic pyrenol-based photoacid dyes to sensitize the membranes to visible light and initiate proton transport. Covalent modification of the membranes was achieved by reacting Nafion sulfonyl fluoride poly(perfluorosulfonyl fluoride) membranes with the photoacid 8-hydroxypyrene-1,3,6-tris(2-aminoethylsulfonamide). The modified membranes were strongly colored and maintained a high selectivity for cations over anions. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ion-exchange measurements together provided strong evidence of covalent bond formation between the photoacids and the polymer membranes. Visible-light illumination of the photoacid-modified membranes resulted in a maximum power-producing ionic photoresponse of ∼100 μA/cm2 and ∼1 mV under 40 Suns equivalent excitation with 405 nm light. In comparison, membranes that did not contain photoacids and instead contained ionically associated RuII-polypyridyl coordination compound dyes, which are not photoacids, exhibited little-to-no photoeffects (∼1 μA/cm2). These disparate photocurrents, yet similar yields for nonradiative excited-state decay from the photoacids and the RuII dyes, suggest temperature gradients were not likely the cause of the observed photovoltaic action from photoacid-modified membranes. Moreover, spectral response measurements supported that light absorption by the covalently bound photoacids was required in order to observe photoeffects. These results represent the first demonstration of photovoltaic action from an ion-exchange membrane and offer promise for supplementing the power demands of electrochemical processes with renewable sunlight-driven ion transport.
中文翻译：
由于光驱动离子传输，光酸改性的 Nafion 的光伏作用观察
用使用光来驱动离子传输的膜替换被动离子交换膜，如 Nafion，将使光电化学技术中的膜发挥积极作用。为此，我们用有机芘醇基光酸染料修饰全氟磺酸离聚物膜，使膜对可见光敏感并启动质子传输。膜的共价改性是通过使 Nafion 磺酰氟聚（全氟磺酰氟）膜与光酸 8-羟基芘-1,3,6-三（2-氨基乙基磺酰胺）反应来实现的。改性膜具有强烈的颜色并保持对阳离子的高选择性而不是阴离子。傅里叶变换红外光谱、X射线光电子能谱、和离子交换测量一起提供了光酸和聚合物膜之间形成共价键的有力证据。光酸改性膜的可见光照明在 405 nm 光的 40 Suns 等效激发下导致产生最大功率的离子光响应为 ~100 μA/cm2 和 ~1 mV。相比之下，不含光酸而含有离子结合的 RuII-聚吡啶基配位化合物染料（不是光酸）的膜几乎没有光效应（~1 μA/cm2）。这些不同的光电流，但来自光酸和 RuII 染料的非辐射激发态衰变的产率相似，表明温度梯度不太可能是观察到的光酸改性膜光伏作用的原因。而且，光谱响应测量支持共价结合的光酸需要吸收光才能观察光效应。这些结果代表了离子交换膜光伏作用的首次展示，并有望通过可再生的阳光驱动的离子传输来补充电化学过程的电力需求。
更新日期：2017-05-15
中文翻译：
由于光驱动离子传输，光酸改性的 Nafion 的光伏作用观察
用使用光来驱动离子传输的膜替换被动离子交换膜，如 Nafion，将使光电化学技术中的膜发挥积极作用。为此，我们用有机芘醇基光酸染料修饰全氟磺酸离聚物膜，使膜对可见光敏感并启动质子传输。膜的共价改性是通过使 Nafion 磺酰氟聚（全氟磺酰氟）膜与光酸 8-羟基芘-1,3,6-三（2-氨基乙基磺酰胺）反应来实现的。改性膜具有强烈的颜色并保持对阳离子的高选择性而不是阴离子。傅里叶变换红外光谱、X射线光电子能谱、和离子交换测量一起提供了光酸和聚合物膜之间形成共价键的有力证据。光酸改性膜的可见光照明在 405 nm 光的 40 Suns 等效激发下导致产生最大功率的离子光响应为 ~100 μA/cm2 和 ~1 mV。相比之下，不含光酸而含有离子结合的 RuII-聚吡啶基配位化合物染料（不是光酸）的膜几乎没有光效应（~1 μA/cm2）。这些不同的光电流，但来自光酸和 RuII 染料的非辐射激发态衰变的产率相似，表明温度梯度不太可能是观察到的光酸改性膜光伏作用的原因。而且，光谱响应测量支持共价结合的光酸需要吸收光才能观察光效应。这些结果代表了离子交换膜光伏作用的首次展示，并有望通过可再生的阳光驱动的离子传输来补充电化学过程的电力需求。
京公网安备 11010802027423号