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The “Midas Touch” Transformation of TiO2 Nanowire Arrays during Visible Light Photoelectrochemical Performance by Carbon/Nitrogen Coimplantation
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2018-04-14 , DOI: 10.1002/aenm.201800165
Xianyin Song 1 , Wenqing Li 1 , Dong He 1 , Hengyi Wu 1 , Zunjian Ke 1 , Changzhong Jiang 1 , Gongming Wang 2 , Xiangheng Xiao 1
Affiliation  

Titanium dioxide is a promising photoanode material for water oxidation, but it is substantially limited by its poor efficiency in the visible light range. Herein, an innovative carbon/nitrogen coimplantation method is utilized to realize the “Midas touch” transformation of TiO2 nanowire (NW) arrays for photoelectrochemical (PEC) water splitting in visible light. These modified golden–yellow rutile TiO2 NW arrays (C/N‐TiO2) exhibit remarkably enhanced absorption in visible light regions and more efficient charge separation and transfer. As a result, the photocurrent density of carbon/nitrogen co‐implanted TiO2 under visible light (>420 nm) can reach 0.76 mA cm−2, which far exceeds the value of 3 µA cm−2 seen for pristine TiO2 nanowire arrays at 0.8 V versus Ag/AgCl. An incident photon to electron conversion efficiency of ≈14.8% is achieved at 450 nm on C/N‐TiO2 without any other cocatalysts. The ion implantation doping approach, combined with codoping strategies, is proved to be an effective strategy for enhancing the photoelectrochemical conversion and can enable further improvement of the PEC water‐splitting performance of many other semiconductor photoelectrodes.

中文翻译:

碳/氮共注入在可见光光电化学性能中TiO2纳米线阵列的“ Midas Touch”转变

二氧化钛是用于水氧化的有前景的光阳极材料,但是由于其在可见光范围内的效率差而受到很大的限制。在本文中,创新的碳/氮共注入方法用于实现TiO 2纳米线(NW)阵列的“ Midas touch”转换,用于可见光中光电化学(PEC)的水分解。这些经过修饰的金黄色金红石型TiO 2 NW阵列(C / N-TiO 2)在可见光区域的吸收明显增强,并且电荷分离和转移效率更高。结果,在可见光(> 420 nm)下,碳/氮共注入的TiO 2的光电流密度可以达到0.76 mA cm -2,远远超过3 µA cm的值。原始TiO 2纳米线阵列在0.8 V下相对于Ag / AgCl的-2。在没有任何其他助催化剂的情况下,在450 nm的C / N-TiO 2上实现的入射光子至电子的转换效率约为14.8%。离子注入掺杂方法与共掺杂策略相结合,被证明是增强光电化学转化的有效策略,并且可以进一步改善许多其他半导体光电极的PEC水分解性能。
更新日期:2018-04-14
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