Ning An,Lei Zhou,Wenli Li,Xiaoli Yuan,Li Zhao,Jingwei Huang,Yang Zhang,Houde She,Lei Wang,Qizhao Wang
Modifying semiconductor photoanode with efficient and cheap iron-based oxygen evolution cocatalyst along with functional interlayer is an efficient method to enhance the water splitting efficiency of photoelectrochemical (PEC). Poly-aminoanthraquinone (PDAAQ) due to its outstanding reversible redox activity plays a significant role as proton receptor. Herein, an easy-handle solvothermal method is adopted to prepare γ-Fe 2 O 3 -PDAAQ@BiVO 4 . With the concerted efforts of the ternary structure, the photocurrent of γ-Fe 2 O 3 -PDAAQ@BiVO 4 photoanode reach to 5.35 mAcm 2 at 1.23 V RHE (3.3 times of pure BiVO 4 ). The improvement is ascribable to the abundant catalytic active sites and large catalytic area of γ-Fe 2 O 3 nanoparticles . Additionally, theoretical calculations show that PDAAQ can form type II heterojunction with BiVO 4 to inhibit carrier recombination. At the same time, the role of PDAAQ in promoting water oxidation kinetics by accelerating proton coupled electron transfer process has also been confirmed in isotope effect experiment.
Juan Liu,Yingnan Qin,Meiqi Wang,Hengjun Liu,Tao Zheng,Jing Tian,Jing Wang
BiVO 4 -based materials have attracted extensive research as advanced photoanode for photogenerated cathodic protection. However, the performance of BiVO 4 -based photoanodes is greatly hindered by its weak charge migration and positive conduction band potential. Herein, poly-2,6-diaminoanthraquinone (PDAAQ)/Bi was grafted on BiVO 4 to improve the separation efficiency of photogenerated carriers and enhance the reducing ability of photogenerated electrons. Studies show that a type II heterojunction can be formed between PDAAQ and BiVO 4 , which accelerates the separation of photogenerated carriers at the interface. In addition, the Bi monomers anchored on BiVO 4 /PDAAQ then expand the light absorption range through the surface plasmon resonance effect. Consequently, the obtained BiVO 4 /PDAAQ/Bi photoanode exhibits a promising photocurrent density of 40 μA·cm -2 , while the photoinduced potential drop is 540 mV, which is approximately 1.4 times of BiVO 4 materials. These outcomes provide general ideas for the design of organic-inorganic heterozygous systems for achieving eco-friendly corrosion protection.
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