Improved photocatalytic activity and stability of InGaN quantum dots/C3N4 heterojunction photoelectrode for CO2 reduction and hydrogen production

材料科学 异质结 量子点 光催化 制氢 还原(数学) 光电子学 生产(经济) 理论(学习稳定性) 纳米技术 化学工程 催化作用 机器学习 生物化学 工程类 宏观经济学 经济 有机化学 化学 计算机科学 数学 几何学
作者
Zhiwei Xing,Xue Zhang,Wenxian Yang,Huan Li,Yukun Zhao,Tieshi Wei,Lifeng Bian,Guifeng Chen,Hua Qin,Shulong Lu
出处
期刊:Nanotechnology [IOP Publishing]
卷期号:32 (50): 505705-505705 被引量:1
标识
DOI:10.1088/1361-6528/ac2450
摘要

Photocatalytic conversion of CO2to produce fuel is considered a promising approach to reduce CO2emissions and tackle energy crisis. GaN-based materials have been studied for CO2reduction because of their excellent optical properties and band structure. However, low photocatalytic activity and severe photocorrosion of GaN-based photoelectrode greatly limit their applications. In this work, photocatalytic activity was improved by adopting InGaN quantum dots (QDs) combined with C3N4nano-sheets as photoanode, and thus the efficiency of CO2reduction and the selectivity of hydrogen production were increased significantly. In addition, the photoelectron-chemical corrosion of photoelectrodes has been apparently controlled. InGaN QDs/C3N4has the highest CO and H2productions rates of 14.69μmol mol-1h-1and 140μmol mol-1h-1which were 2.2 times and 14.5 times than that of InGaN film photoelectrode, respectively. The enhancement of photocatalytic activity is attributed to C3N4modification and a large electric dipole forming on the surface of InGaN QDs, which facilitate the separation and transfer of photo-generated carriers and thus promote CO2reduction reaction. This work provides a promising strategy for the development of GaN-based photoanodes with superior stability and efficiency.
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