Defect-induced hydrophilic CuMOF -modified CuBi2O4 for nitrate to ammonia reduction
Pengpeng Yang1, Yufei Wang1, Yuxin Fan1
1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Abstract:
The synthetic ammonia (NH3) process based on the photoelectrochemical nitrate reduction reaction (PEC NIRR) represents a green pathway, but precisely controlling the interfacial reactions to suppress hydrogen evolution and promote nitrate reduction is a key challenge. In this study, a CuBi2O4/CuMOF for PEC NIRR has been successfully constructed. Owing to its intrinsic defect structure, CuMOF exhibits the excellent hydrophilicity, which effectively promotes the adsorption and cleavage of water molecules. Furthermore, the generation of active hydrogen radicals (H*) improves the catalytic reaction kinetics. CuBi2O4/CuMOF achieves an NH3 yield of 19.76 μg h-1 cm-2, which is approximately 3.12 times that of CuBi2O4, and the NH3 selectivity of CuBi2O4/CuMOF is 2.08 times than that of CuBi2O4. In summary, this study clarifies the key role of defect-induced hydrophilicity of CuMOF in the generation of H*, which provides a new idea for designing the efficient PEC NIRR systems.
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