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One‐Step Synthesis of Nb2O5/C/Nb2C (MXene) Composites and Their Use as Photocatalysts for Hydrogen Evolution
ChemSusChem ( IF 7.5 ) Pub Date : 2018-01-29 , DOI: 10.1002/cssc.201702317
Tongming Su 1, 2, 3 , Rui Peng 2 , Zachary D. Hood 2, 4 , Michael Naguib 5, 6 , Ilia N. Ivanov 2 , Jong Kahk Keum 2 , Zuzeng Qin 1 , Zhanhu Guo 3 , Zili Wu 2
Affiliation  

Hydrogen production through facile photocatalytic water splitting is regarded as a promising strategy to solve global energy problems. Transition‐metal carbides (MXenes) have recently drawn attention as potential co‐catalyst candidates for photocatalysts. Here, we report niobium pentoxide/carbon/niobium carbide (MXene) hybrid materials (Nb2O5/C/Nb2C) as photocatalysts for hydrogen evolution from water splitting. The Nb2O5/C/Nb2C composites were synthesized by one‐step CO2 oxidation of Nb2CTx. Nb2O5 grew homogeneously on Nb2C after mild oxidation, during which some amorphous carbon was also formed. With an optimized oxidation time of 1.0 h, Nb2O5/C/Nb2C showed the highest hydrogen generation rate (7.81 μmol h−1 gcat−1), a value that was four times higher than that of pure Nb2O5. The enhanced performance of Nb2O5/C/Nb2C was attributed to intimate contact between Nb2O5 and conductive Nb2C and the separation of photogenerated charge carriers at the Nb2O5/Nb2C interface; the results presented herein show that transition‐metal carbide are promising co‐catalysts for photocatalytic hydrogen production.

中文翻译:

Nb2O5 / C / Nb2C(MXene)复合材料的一步合成及其作为光催化制氢的用途

通过简便的光催化水分解制氢技术被认为是解决全球能源问题的有前途的战略。过渡金属碳化物(MXenes)作为光催化剂的潜在助催化剂候选物最近受到了关注。在这里,我们报告五氧化二铌/碳/碳化铌(MXene)杂化材料(Nb 2 O 5 / C / Nb 2 C)作为光分解水分解氢的光催化剂。Nb 2 CT x的一步一步CO 2氧化合成了Nb 2 O 5 / C / Nb 2 C复合材料。Nb 2 O 5在Nb 2上均匀生长温和氧化后的碳,在此期间还形成了一些无定形碳。Nb 2 O 5 / C / Nb 2 C的最佳氧化时间为1.0 h,显示出最高的氢生成速率(7.81μmolh -1  g cat -1),该值是纯Nb 2的四倍。O 5。Nb 2 O 5 / C / Nb 2 C的性能增强归因于Nb 2 O 5和导电Nb 2 C之间的紧密接触以及Nb 2 O 5 / Nb处光生载流子的分离2个C接口;本文介绍的结果表明,过渡金属碳化物是光催化制氢的有前途的助催化剂。
更新日期:2018-01-29
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