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Heterointerface-engineered SnO2@CoFe layered double hydroxide interfacial catalysts for efficient water dissociation
Ming Li1, Wancun Huo1, Qi Gao2
1School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China; Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, State Key Laboratory of Advanced Separation Membrane Materials, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China.
None:
Bipolar membranes (BPMs) are important components in electrochemical energy-conversion systems, but their performance is often limited by slow interfacial water dissociation (WD). Herein, a heterostructured SnO2@CoFe layered double hydroxide (SnO2@CoFe-LDH) catalyst was designed as an efficient interfacial layer to accelerate WD in BPMs. SnO2 nanoparticles uniformly anchored on CoFe layered double hydroxide (CoFe-LDH) nanosheets form a robust heterointerface that promotes interfacial charge redistribution and enhances water-molecule activation. Owing to this synergistic heterostructure, the resulting BPM delivers a low transmembrane voltage of 0.75 V at 100 mA cm-2 and an ultralow WD resistance of 0.12 Ω, together with stable operation for 72 h at 50 mA cm-2. Efficient acid-base generation with high current efficiency and low energy consumption is further achieved in bipolar membrane electrodialysis. This work highlights heterointerface engineering as an effective strategy for developing high-performance BPM interfacial catalysts.
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