Enhanced Photoelectrochemical Water Oxidation on BiVO 4 Photoanodes Functionalized by Bimetallic Dicyanamide Molecular Catalysts

Xiaokang Wan (), Dashun Lu, Xianyun Wang, Gezhong Liu, Yanming Fu, Chao Hu, Nai Rong, Haitao Wang and Zude Cheng
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Xiaokang Wan: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Dashun Lu: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Xianyun Wang: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Gezhong Liu: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Yanming Fu: Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
Chao Hu: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Nai Rong: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Haitao Wang: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
Zude Cheng: Anhui Advanced Technology Research Institute of Green Building, School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China

Sustainability, 2023, vol. 15, issue 4, 1-16

Abstract: A novel hybrid structure of bimetallic dicyanamide decorated BiVO 4 is developed via a simple method to accelerate interfacial water oxidation kinetics. Two types of bimetallic dicyanamides, CoNi(dca) 2 and CoFe(dca) 2 , are coated on BiVO 4 photoanodes and are found to exhibit far more enhanced PEC performance than Co(dca) 2 or Ni(dca) 2 as cocatalysts. The successful deposition of metal dicyanamides on BiVO 4 photoanodes is confirmed by physical characterizations including X-ray photoelectron spectroscopy (XPS). The optimized Co 0.9 Ni 0.1 (dca) 2 /BiVO 4 photoanode exhibits the highest photocurrent density of 2.58 mA/cm 2 at 1.23 V vs. RHE under 100 mW/cm 2 AM 1.5 G irradiation, which is 2.5 times that of bare BiVO 4 . The substantial enhancement of PEC performance can be ascribed to the advantageous interfacial charge transfer and improved charge injection efficiencies. This work presents a feasible strategy using different types of bimetallic dicyanamides to design a modified BiVO 4 -based photoanode system for enhanced water oxidation efficiency.

Keywords: photoelectrochemical; BiVO 4; water oxidation catalyst; bimetallic; cocatalysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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