| Citation: |
Yanan Li, Ruopian Fang, Jiangtao Xu, Da-Wei Wang, Lixue Jiang. Surface reconstruction of CoAl hydroxide electrodes for accelerated oxygen evolution reaction[J]. Energy Lab. doi: 10.54227/elab.20250003
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Surface reconstruction of CoAl hydroxide electrodes for accelerated oxygen evolution reaction
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Abstract
Water electrolysis powered by renewable energy is recognized as a sustainable approach for green hydrogen production. Rational design of efficient and low-cost electrocatalysts especially for the sluggish oxygen evolution reaction (OER) remains a significant challenge. Here, we report a two-step surface reconstruction strategy, alkaline etching and anodic activation on CoAl hydroxide electrodes which remarkably enhance the OER performance. A low overpotential of 269 mV at 10 mA cm−2 is achieved in 1 M KOH electrolyte, along with a notably reduced
Tafel slope of 37 mV dec−1, a 16-fold enhanced catalyst intrinsic activity at an overpotential of 300 mV, and excellent stability without noticeable degradation over 50 hours operation. The dynamic surface reconstruction of CoAl hydroxide catalyst is evidenced by physical characterization in the process of alkaline etching and anodic activation. The defective structure and the modulated electronic distribution on the catalyst surface are demonstrated to facilitate electron transfer and OER kinetics. Our work presents a feasible surface reconstruction approach for designing high-efficiency catalytic electrodes in alkaline water electrolysis. -
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References
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Yanan Li, Ruopian Fang, Jiangtao Xu, Da-Wei Wang, Lixue Jiang. Surface reconstruction of CoAl hydroxide electrodes for accelerated oxygen evolution reaction[J]. Energy Lab. doi: 10.54227/elab.20250003
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Figure 1.
Schematic illustrations of the synthesis of A-CoAl/NF.
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Figure 2.
Characterization analysis of CoAl/NF, D-CoAl/NF and A-CoAl/NF. SEM images of a CoAl/NF, b D-CoAl/NF, c A-CoAl/NF. d Co, Ni, Al atomic ratio (Co at% + Ni at% + Al at% = 100%). High-resolution XPS of CoAl/NF, D-CoAl/NF and A-CoAl/NF e Co 2p, f Al 2p, g O 1s, h Ni 2p. i Ex situ Raman spectra.
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Figure 3.
Mechanism analysis of anodic activation processes. a The evolution of polarization curves during anodic activation process. b The corresponding Nyquist plots with the LSV polarization curves in a. c Polarization curves of A-Co(OH)2/NF before and after CVs. CV curves and its zoom-in image of d A-CoAl/NF and e A-Co(OH)2/NF. f The overpotential of original, used and recovered A-CoAl/NF.
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Figure 4.
Electrocatalytic OER performance of A-CoAl/NF and reference samples. a Polarization curves of A-CoAl/NF in 1 M KOH, with that of Co(OH)2/NF, and CoAl/NF for comparison. b Comparison of overpotentials required for current density j = 10 mA. c The corresponding Tafel plots. d The corresponding Nyquist plots. e The corresponding double-layer capacitance measurements (Cdl values). f Chronopotentiometry curves of A-CoAl/NF at constant current densities of 10 mA cm−2, inset: OER performance before and after 50h CP test.
