Development of direct formic acid fuel cell (DFAFC) is significantly constrained by low output performance and poor durability because of the sluggish formic acid oxidation reaction (FAOR) and the poisoning by CO_ads intermediate on the Pt‐based electrocatalyst at low operating temperatures. By operating DFAFCs at elevated temperatures, the peak power density (PPD) of the cell based on the Pt/C catalyst increases significantly. For example, the PPD of DFAFC reaches 198 mW cm⁻² at 240 °C, eight times higher than that of the DFAFC at 70 °C. The study shows the surprising transition in power performance of DFAFCs at elevated temperatures. The increase of PPD for DFAFC against temperature is 121 mW cm⁻²/100 °C at temperatures above 115 °C, almost three times higher than the 45 mW cm⁻²/100 °C obtained at lower temperatures. The fundamental reason for the substantially enhanced power output and durability is the gradual transformation of the reaction kinetics from sluggish direct FAOR at low temperatures to fast H₂ oxidation reaction at elevated temperatures due to the increased in situ decomposition of formic acid on Pt/C catalysts at temperatures above 100 °C. This study demonstrates that operation at temperatures above 160 °C is most effective to promote performance and durability of DFAFCs.

中文翻译：

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高温下直接甲酸燃料电池的功率输出和耐用性大大提高

直接甲酸燃料电池（DFAFC）的发展是由低输出性能和耐久性差显著约束，因为呆滞甲酸氧化反应（FAOR）和CO中毒的_广告上在低操作温度下，Pt基电中间体。通过在升高的温度下运行DFAFC，基于Pt / C催化剂的电池峰值功率密度（PPD）显着增加。例如，DFAFC的PPD在240°C时达到198 mW cm ^-2，是DFAFC在70°C时的PPD的八倍。研究表明，DFAFC在高温下的功率性能出现了令人惊讶的转变。DFAFC的PPD随温度的增加为121 mW cm ^-2温度高于115°C时为/ 100°C，几乎是较低温度下获得的45 mW cm ^-2 / 100°C的三倍。功率输出和耐用性显着提高的根本原因是，由于Pt / C催化剂上甲酸的原位分解增加，反应动力学从低温下缓慢的FAOR反应逐渐转变为高温下的快速H ₂氧化反应。温度高于100°C。这项研究表明，在高于160°C的温度下运行对提高DFAFC的性能和耐久性最有效。