Improved photocatalytic activity and stability of InGaN quantum dots/C3N4 heterojunction photoelectrode for CO2 reduction and hydrogen production
Improved photocatalytic activity and stability of InGaN quantum dots/C3N4 heterojunction photoelectrode for CO2 reduction and hydrogen production
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提高InGaN量子点/C3N4异质结光电极用于CO2还原和制氢的光催化活性和稳定性
DOI：
10.1088/1361-6528/ac2450
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发表时间：
2021-09
期刊：
影响因子：
3.5
通讯作者：
Lu Shulong
中科院分区：
文献类型：
--
作者：
Xing Zhiwei;Zhang Xue;Yang Wenxian;Li Huan;Zhao Yukun;Wei Tieshi;Bian Lifeng;Chen Guifeng;Qin Hua;Lu Shulong
光催化转化二氧化碳以生产燃料被认为是一种减少二氧化碳排放和应对能源危机的有前景的方法。基于氮化镓的材料因其优异的光学性能和能带结构而被用于二氧化碳减排的研究。
Photocatalytic conversion of CO2 to produce fuel is considered a promising approach to reduce CO2 emissions and tackle energy crisis. GaN-based materials have been studied for CO2 reduction 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 C3N4 nano-sheets as photoanode, and thus the efficiency of CO2 reduction and the selectivity of hydrogen production were increased significantly. In addition, the photoelectron-chemical corrosion of photoelectrodes has been apparently controlled. InGaN QDs/C3N4 has the highest CO and H2 productions rates of 14.69 μmol mol−1 h−1 and 140 μmol mol−1 h−1 which were 2.2 times and 14.5 times than that of InGaN film photoelectrode, respectively. The enhancement of photocatalytic activity is attributed to C3N4 modification 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 CO2 reduction reaction. This work provides a promising strategy for the development of GaN-based photoanodes with superior stability and efficiency.
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