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在光照和偏压作用下,浸泡在电解质1mol/L的CO_2碳酸氢钠的PN结(PEC)可以生成烃类燃料。当PEC的光电阴极是由pt敏化的半导体的TiO_2纳米管阵列,或当光阳极是n型的磷掺杂TiO_2纳米管阵列薄膜带隙照明下PEC使CO_2转化为碳氢化合物,如CH4、CO。且上述两种掺杂都使得饱和CO_2水溶液中C原子转化为烃类气体的转化率得以提高。此外,又发现磷系TiO_2纳米管做阳极时有利于光还原产物对CO选择性的提高,Pt掺杂TiO_2纳米管做阴极时有利于光还原产物对CH_4选择性的提高。所描述的技术提供了一种独特的方法,利用地球丰富的材料,光催化还原CO_2和产生更高阶的碳氢化合物以及合成气的组成成分CO和H_2。
Under the action of light and bias, the PN junction (PEC) of CO_2 sodium bicarbonate soaked in electrolyte 1mol / L can generate hydrocarbon fuel. When PEC photocathodes are made from pt-sensitized semiconducting TiO 2 nanotube arrays or when the photoanode is n-type phosphor-doped TiO 2 nanotube arrays, the PEC converts CO 2 to hydrocarbons such as CH 4, CO. And the above two kinds of doping make the conversion rate of C atoms in saturated CO 2 aqueous solution into hydrocarbon gas increase. In addition, it was also found that phosphorus-based TiO 2 nanotubes are conducive to the CO selectivity of the photoreduction product when they are used as anodes. When the Pt-doped TiO 2 nanotubes are used as the cathode, the selectivity of the photoreduction product to CH 4 is improved. The described technique provides a unique method of photocatalytically reducing CO 2 and producing higher order hydrocarbons, as well as components of syngas, CO and H 2, using the Earth’s abundant materials.