Room-temperature conversion of the photoelectrochemical oxidation of methane into electricity at nanostructured TiO2,Sustainable Energy & Fuels

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Room-temperature conversion of the photoelectrochemical oxidation of methane into electricity at nanostructured TiO2
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-10-16 , DOI: 10.1039/d0se00984a
Yanir Kadosh _{1,

2,

3,

4} , Eli Korin _{1,

2,

3,

4} , Armand Bettelheim _{1,

2,

3,

4}

Affiliation

The energy potential of methane is restrained by the energy input required to break its C–H bond. Therefore, most of the energy conversion processes of methane use thermochemical activation which is highly endothermic. The present report demonstrates the effective photoelectrochemical activity of a TiO₂ nanotube arrays photoanode towards methane oxidation in acidic electrolyte and ambient conditions. The examined photoanode exhibits a higher photocurrent density response in the presence of methane as compared to that obtained in its absence (0.54 vs. 0.27 mA cm⁻², respectively). Products characterization reveals a relatively high faradaic efficiency towards the formation of CO₂ and formic acid (72 and 16% at 0.3 V vs. RHE, respectively). These results are correlated to the role of the special surface architecture of the nanotube arrays in dictating the reaction pathways. The first time room-temperature operation of a solar driven fuel cell (photo-fuel cell), in which methane oxidation is converted to electricity, is also demonstrated. This device performing with an acidic electrolyte or as a gas phase photo-fuel cell exhibited output maximum power densities of 69 and 82 μW cm⁻², respectively.

中文翻译：

在纳米结构的TiO2上将甲烷的光电化学氧化室温转化为电

甲烷的能量潜力受到打破其C–H键所需的能量输入的限制。因此，甲烷的大多数能量转化过程都使用高度吸热的热化学活化。本报告证明了TiO ₂纳米管阵列光阳极对酸性电解质和环境条件下甲烷氧化的有效光电化学活性。与在不存在甲烷的情况下获得的光阳极相比，所检查的光阳极在甲烷存在下表现出更高的光电流密度响应（分别为0.54 vs. 0.27 mA cm ^-2）。产品表征表明，在形成CO ₂和甲酸方面，法拉第效率较高（0.3 V vs. 72 V时分别为72％和16％）。RHE）。这些结果与纳米管阵列的特殊表面结构在决定反应路径中的作用有关。还说明了将甲烷氧化转化为电能的太阳能驱动燃料电池（光燃料电池）的首次室温操作。该使用酸性电解质或作为气相光燃料电池的装置分别显示出69和82μWcm ^-2的最大输出功率密度。

更新日期：2020-12-17

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