Ta-Doped porous TiO2 nanorod arrays by substrate-assisted synthesis: efficient photoelectrocatalysts for water oxidation
Ta-Doped porous TiO2 nanorod arrays by substrate-assisted synthesis: efficient photoelectrocatalysts for water oxidation
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基底辅助合成的 Ta 掺杂多孔 TiO2 纳米棒阵列：用于水氧化的高效光电催化剂
DOI：
10.1039/c8nr04003f
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发表时间：
2018-11-07
期刊：
影响因子：
6.7
通讯作者：
Wu, Mingmei
中科院分区：
文献类型：
--
作者：
He, Shiman;Meng, Yuying;Wu, Mingmei
二氧化钛因其优良的化学稳定性和低廉的成本，作为光电化学(PEC)分解水的光阳极得到了广泛的研究。然而，二氧化钛在太阳能到合成燃料转化过程中的实际应用一直受到其本身较差的光生电子和空穴传输能力的限制。在这篇文章中，我们报道了Ta掺杂的多孔纳米棒阵列(Ta-PTNA)，它不具有这一问题，因此可以有效地光电催化水氧化，以牺牲太阳光为代价，帮助从水中生产H-2(一种清洁的燃料)。该材料是通过一种新的、简便的合成方法合成的，该方法包括用Ta箔对二氧化钛前驱体进行水热处理，而不需要种子和模板，然后对产物进行焙烧。除了作为Ta掺杂原子的来源外，Ta箔被发现在材料中纳米孔的形成中起着至关重要的作用。特别是在180℃水热处理10h得到的材料(Ta-PTNA-10)具有很大的光电流密度和很高的光转化效率(0.79V时0.32%比RHE，这比以前报道的许多光催化剂要好，比未掺杂的Ti02纳米棒阵列大近4倍)。Ta-PTNAs具有优异的PEC催化性能是由于其具有纳米孔结构和较高的电子导电性。
Owing to its excellent chemical stability and low cost, titanium dioxide (TiO2) has been widely studied as a photoanode for photoelectrochemical (PEC) water splitting. However, TiO2's practical applications in solar energy-to-synthetic fuel conversion processes have been constrained by its inherently poor ability to transport photogenerated electrons and holes. In this paper, we report Ta-doped porous TiO2 nanorod arrays on Ta foil (Ta-PTNA) that do not possess this issue and that can thus efficiently photoelectrocatalyze water oxidation, helping the production of H-2 (a clean fuel) from water at the expense of solar light. The materials are synthesized by a new, facile synthetic approach involving the hydrothermal treatment of a TiO2 precursor with Ta foil, without seeds and templates, and followed by calcination of the product. Besides serving as a source of Ta dopant atoms, Ta foil is found to play a vital role in the formation of nanopores in the materials. The material obtained with hydrothermal treatment at 180 degrees C for 10 h (Ta-PTNA-10), in particular, affords very large photocurrent density and very high photoconversion efficiency (0.32% at 0.79 V vs. RHE, which is better than those of many previously reported photocatalysts and approximate to 4 times larger than that of undoped TiO2 nanorod arrays). Ta-PTNAs' remarkable PEC catalytic performance is found to be due to their nanoporous structure and high electronic conductivity.