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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Facile one-pot controlled synthesis of Sn and C codoped single crystal TiO2 nanowire arrays for highly efficient photoelectrochemical water splitting
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Facile one-pot controlled synthesis of Sn and C codoped single crystal TiO2 nanowire arrays for highly efficient photoelectrochemical water splitting

机译：锡和碳共掺杂单晶TiO2纳米线阵列的轻松一锅控制合成，用于高效光电化学水分解

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Here we report a (Sn, C) cation-anion codoped single crystal TiO2 nanowire (NW) arrays as a highly efficient solar water splitting photoelectrode, able to be fabricated using a facile one pot hydrothermai synthesis method. The synergetic effects of codoping on the photoelectrochemical activity of the photoan-ode were investigated and compared to undoped and monodoped photoelectrodes. The (Sn, C) codoped TiO2 NW photoanode generated the highest saturated photocurrent density i.e. 2.8mA/cm~2 at 1.23 V vs RHE while yielding a maximum solar energy conversion efficiency of 1.32% at a potential of 0.55 V vs RHE - representing 60%, 94%, and 100% efficiency improvements compared to undoped, Sn doped, and C doped TiO2 NW respectively at same potential. This improvement is attributed to the synergetic effects of Sn and C codopants to lower recombination and enhance life time of photogenerated charge-separated carriers on the surface states that lead to efficient hole transfer at the photoelectrode/electrolyte interface. In addition, an increased charge carrier density and conductivity (as evidenced from electrochemical impedance spectroscopy) and the enhanced incorporation of dopants in the codoped system, compared to monodoped system as quantified by XPS, highlights the importance of codoping. The nanomaterial was characterized by XRD, TEM, SEM and Raman UV-vis measurements. This study will guide improvements in the efficiency of TiO2 for PEC water splitting using optimized codopant pairs.
机译：在这里我们报告（Sn，C）阳离子-阴离子共掺杂的单晶TiO2纳米线（NW）阵列作为一种高效的太阳能水分解光电极，可以使用一种简便的一锅水热合成方法来制造。研究了共掺杂对光电极光电化学活性的协同作用，并将其与未掺杂和单掺杂的光电极进行了比较。 （Sn，C）共掺杂的TiO2 NW光电阳极在1.23 V vs RHE时产生了最高的饱和光电流密度，即2.8mA / cm〜2，而在0.55 V vs RHE的电势下产生了1.32％的最大太阳能转化效率-代表60与在相同电势下未掺杂，Sn掺杂和C掺杂的TiO2 NW相比，效率分别提高了％，94％和100％。这种改善归因于锡和碳共掺杂物的协同作用，以降低复合并增加表面状态下光生电荷分离的载流子的寿命，从而导致在光电极/电解质界面的有效空穴转移。此外，与XPS量化的单掺杂系统相比，增加的电荷载流子密度和电导率（如电化学阻抗谱所证明）以及掺杂物在共掺杂系统中的掺入增加，凸显了共掺杂的重要性。通过XRD，TEM，SEM和拉曼UV-vis测量来表征纳米材料。这项研究将指导使用优化的共掺杂物对提高TiO2在PEC水分解中的效率。

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