Improved photoelectrocatalytic hydrogen generation through BiVO4 quantum-dots loaded on nano-structured SnO2 and modified with carbon quantum-dots
Improved photoelectrocatalytic hydrogen generation through BiVO4 quantum-dots loaded on nano-structured SnO2 and modified with carbon quantum-dots
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通过负载在纳米结构 SnO2 上并用碳量子点修饰的 BiVO4 量子点改善光电催化制氢
DOI：
10.1016/j.cej.2017.08.102
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发表时间：
2018
影响因子：
15.1
通讯作者：
Erqing Xie
中科院分区：
文献类型：
--
作者：
Zemin Zhang;Xiao Jiang;Junfeng Mei;Yunxia Li;Weihua Han;Mingzheng Xie;Fangcong Wang;Erqing Xie
钒酸铋(BiVO4)作为人工光合作用中一种很有前途的放氧剂，已被广泛研究。但由于其导带较低，反应过电势较高，在制氢中的应用较少。在这里，我们提出了一种有效的策略来解决这些问题，通过在纳米结构的氧化锡(SnO2)上分布BiVO4量子点。纳米结构的SnO2同时作为主体衬底和钝化层。碳量子点还被用来改善BiVO4-SnO2界面的电荷转移和电催化性能。正如预期的那样，最终的复合材料在0.6伏电压下的净光电流为2.2mA/cm−，而在没有偏压的情况下，制氢速率为0.54mA/μ·h−1。这种优异的性能归功于BiVO4-SnO2界面电子能量的增强、电荷的有效分离以及从BiVO4到碳量子点和电解液的快速空穴转移。
Bismuth vanadate (BiVO4) has been widely studied as a promising candidate for oxygen evolution in artificial photosynthesis. However, it was seldom used in hydrogen generation because of its low conduction band and high reaction overpotential. Here, we proposed an effective strategy to address these issues by distributing BiVO4quantum dots onto nanostructured tin oxide (SnO2). The nanostructured SnO2simultaneously served as the host substrate and a passivation layer. Carbon quantum dots were also used to improve the charge transfer and electrocatalytic properties at the BiVO4-SnO2interface. As expected, the final composite yields a net photocurrent of 2.2 mA cm−2at 0.6 V vs. Ag/AgCl, and a hydrogen generation rate of 0.54 μmol·h−1without bias. The excellent performance was due to the enhanced electron energy, effective charge separation at the BiVO4-SnO2interface, and the fast hole transfer from BiVO4to carbon quantum dots and electrolyte.
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