R. López, Justin Fuentes, Adrian Gonzalez-Camps, T. Benhaddouch, A. Kaushik, Christopher Lloyd Metler, S. Bhansali, D. Dong
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引用次数: 1
摘要
据我们所知,基于氟化物特异性电化学微传感器对质子交换膜燃料电池(pemfc)膜降解进行持续实时监测的工作很少。pemfc是一种生态智能能源,可用于高效运输,但降解率不同,会磨损膜电极组件(MEA),而膜电极组件是燃料电池功能的关键组成部分。目前的市场选择缺乏具体的诊断和合理的指示,何时需要更换膜。因此,这项工作的重点是制造一种传感器,通过功能化的LaF3:(Au纳米颗粒)薄膜(~ 60 nm),选择性地监测出水中的氟化物浓度,从而实时测量MEA的降解情况。通过旋转镀膜沉积和后退火工艺优化,该传感器在低于10 ppb的水平下实现了卓越的特异性/灵敏度。通过开路电位、循环伏安法、计时伏安法和差分脉冲伏安法的表征,已经实现并研究了它的多模态读数,结果显示,在0 ppb下,它从15.7 mA cm - 2线性下降到10.2 mA cm - 2,同时还保持了它的低成本、小尺寸和鲁棒性。
To the best of our knowledge, very few works have been done for the continuous real-time monitoring of Proton Exchange Membrane Fuel Cells (PEMFCs) membrane degradation based on fluoride-specific electrochemical microsensors. PEMFCs are eco-smart energy sources for efficient transportation but experience variable degradation rates that wear the Membrane Electrode Assembly (MEA), a critical component of the fuel cell’s functionality. Current market options lack specific diagnostics and a legitimate indication of when exactly the membrane needs to be replaced. As such, this work focused on manufacturing a sensor for measuring MEA degradation in real-time by selectively monitoring fluoride concentration in effluent water, a signature PEMFCs degradation status, through functionalized LaF3:(Au nanoparticle) thin films (∼60 nm). The sensor’s exceptional specificity/sensitivity has been achieved in real-time at a sub 10 ppb level, optimized through spin-coating deposition and post-annealing process. Its multimodal readout has been achieved and studied through the characterizations of open circuit potential, cyclic voltammetry, chronoamperometry, and differential pulse voltammetry revealing a consistent linear decrease of 15.7 mA cm−2 at 0 ppb to 10.2 mA cm−2, while also maintaining its low-cost, small size, and robustness.