Boosting photocatalytic hydrogen evolution over 2D/0D graphene/H–In2O3 nanohybrids with regulated oxygen vacancies
Boosting photocatalytic hydrogen evolution over 2D/0D graphene/H–In2O3 nanohybrids with regulated oxygen vacancies
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通过调节氧空位促进 2D/0D 石墨烯/H-In2O3 纳米杂化物的光催化析氢
DOI：
10.1016/j.renene.2022.05.104
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发表时间：
2022-05
期刊：
影响因子：
8.7
通讯作者：
Da Chen
中科院分区：
文献类型：
--
作者：
He He;Huayu Chen;Pei Ning;Junhui Liang;Xin Yao;Yanfang Gao;Pashka Byambatsogt;Laishun Qin;Yuexiang Huang;Da Chen
氢气被认为是解决碳污染最有效的方法之一。氧化铟（In 2 O3）具有良好的导电性和稳定性，在析氢光催化剂方面具有很大的应用潜力.然而，In 2 O3基催化剂的可见光响应较弱，限制了其应用.虽然氢化是提高金属氧化物光响应的有效方法，但不稳定的氧空位引起的严重不稳定性不容忽视。本文报道了石墨烯/氢化In 2 O3（H-In 2 O3）2D/0 D异质结构的制备。有趣的是，石墨烯的引入不仅通过形成异质结促进光吸收和电荷分离，而且还调节表面氧空位的浓度。利用X射线光电子能谱（XPS）、电子顺磁共振（EPR）和光致发光谱（PL）研究了其形成机理。结果表明，石墨烯/H-In 2 O3（GHI）异质结的光催化析氢活性显著提高，最佳光催化析氢速率分别是In 2 O3和H-In 2 O3样品的16.3倍和2.6倍.此外，石墨烯/H-In 2 O3的表面氧空位的调节使其在连续循环测量过程中保持稳定。这些发现为高效稳定的金属氧化物光催化剂的设计提供了参考。
Hydrogen is considered as one of the most efficient solutions to the carbon pollution. Indium oxide (In 2 O 3 ) with good electrical conductivity and stability has great potential in utilization as hydrogen evolution photocatalyst. However, weak visible light response of In 2 O 3 -based catalysts limits their applications. Although the hydrogenation is a well-known effective method to enhance the photoresponse of metal oxides, severe instability caused by the unstable oxygen vacancies cannot be ignored. Here, we report the synthesis of graphene/hydrogenated In 2 O 3 (H–In 2 O 3 ) 2D/0D heterostructure. Interestingly, the introduction of graphene not only facilitates the light absorption and charge separation by the formation of heterojunction, but also regulates the concentration of surface oxygen vacancies. X-ray photoelectron spectra (XPS), electron paramagnetic resonance (EPR), and photoluminescence spectra (PL) are employed to investigate the mechanism. As expected, the prepared graphene/H–In 2 O 3 (GHI) heterojunction shows significantly improved photocatalytic hydrogen evolution activities, and the optimal photocatalytic hydrogen evolution rate is 16.3 times and 2.6 times that of the In 2 O 3 and H–In 2 O 3 sample, respectively. Moreover, the regulation of the surface oxygen vacancies enables the graphene/H–In 2 O 3 to be stable during continuous cycling measurements. These findings shed a light on the design of highly efficient and stable metal oxides based photocatalysts.
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