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首页> 外文期刊>ACS catalysis >Cobalt-Doped Black TiO2 Nanotube Array as a Stable Anode for Oxygen Evolution and Electrochemical Wastewater Treatment
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Cobalt-Doped Black TiO2 Nanotube Array as a Stable Anode for Oxygen Evolution and Electrochemical Wastewater Treatment

机译：钴掺杂的黑色TiO2纳米管阵列作为氧气进化和电化学废水处理的稳定阳极

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TiO2 has long been recognized as a stable and reusable photocatalyst for water splitting and pollution control. However, it is an inefficient anode material in the absence of photoactivation due to its low electron conductivity. To overcome this limitation, a series of conductive TiO2 nanotube array electrodes have been developed. Even though nanotube arrays are effective for electrochemical oxidation initially, deactivation is often observed within a few hours. To overcome the problem of deactivation, we have synthesized cobalt doped Black-TiO2 nanotube array (Co-Black NTA) electrodes that are stable for more than 200 h of continuous operation in a NaClO4 electrolyte at 10 mA cm(-2). Using X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, electron paramagnetic resonance spectroscopy, and DFT simulations, we are able to show that bulk oxygen vacancies (O-v) are the primary source of the enhanced conductivity of Co-Black. Cobalt doping both creates and stabilizes surficial oxygen vacancies, O-v and thus prevents surface passivation. The Co-Black electrodes outperform dimensionally stable IrO2 anodes (DSA) in the electrolytic oxidation of organic-rich wastewater. Increasing the loading of Co leads to the formation of a CoOx film on top of Co-Black electrode. The CoOx/Co-Black composite electrode was found to have a lower OER overpotential (352 mV) in comparison to a DSA IrO2 (434 mV) electrode and a stability that is greater than 200 h in a 1.0 M KOH electrolyte at a current density of 10 mA cm(-2).
机译：TiO2长期被认为是用于水分裂和污染控制的稳定和可重复使用的光催化剂。然而，由于其低电子传导性，它是在没有光激活的情况下的低效阳极材料。为了克服这种限制，已经开发了一系列导电TiO2纳米管阵列电极。尽管纳米管阵列最初对电化学氧化有效，但是在几小时内通常观察到失活。为了克服去激活的问题，我们已经合成了掺杂的掺杂黑色-TiO2纳米管阵列（共黑NTA）电极，其在10mA cm（-2）的NaClO4电解质中连续操作稳定。使用X射线光电子能谱，X射线吸收光谱，电子顺磁共振光谱和DFT仿真，我们能够显示散装氧空位（O-V）是共黑色电导率的主要源。掺杂掺杂均产生并稳定表格氧空位，O-V并因此防止表面钝化。共黑电极在有机富含废水的电解氧化中优于尺寸稳定的IRO2阳极（DSA）。增加CO负载导致在共黑电极顶部形成COOO膜。与DSA IRO2（434mV）电极相比，发现COOO /共黑色复合电极具有下oer过电（352mV），并且在电流密度为1.0M KOH电解质中大于200h的稳定性10 mA cm（-2）。

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