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Figures of the Article
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Structural characterization of Con/Ni(OH)2, Ir1/Ni(OH)2, and ConIr1/Ni(OH)2. HAADF-STEM images of Con/Ni(OH)2 (a), Ir1/Ni(OH)2 (b), and ConIr1/Ni(OH)2 (c). EDX elemental mapping of Con/Ni(OH)2 (d), Ir1/Ni(OH)2 (e), and ConIr1/Ni(OH)2 (f).
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Electronic structure characterization of Co clusters on Con/Ni(OH)2 and ConIr1/Ni(OH)2 and Ir single atoms on Ir1/Ni(OH)2 and ConIr1/Ni(OH)2. Normalized XANES (a) and EXAFS (b) spectra without phase correction at the Co K-edge of Con/Ni(OH)2 and ConIr1/Ni(OH)2. Co foil and Co2O3 were used as references. Normalized XANES (c) and EXAFS (d) spectra at the Ir L3 edge of Ir1/Ni(OH)2 and ConIr1/Ni(OH)2. Ir foil and IrO2 were used as references.
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Electrocatalytic performances toward the OER. (a) Polarization curves of Ni(OH)2, Con/Ni(OH)2, Ir1/Ni(OH)2, ConIr1/Ni(OH)2 and IrO2. The measurements were conducted in 1.0 mol·L−1 KOH. (b) Overpotentials at a current density of 10 mA·cm−2 for Ni(OH)2, Con/Ni(OH)2, Ir1/Ni(OH)2, ConIr1/Ni(OH)2 and IrO2. (c) Mass activities and turnover frequencies of Con/Ni(OH)2 and ConIr1/Ni(OH)2 at an overpotential of 300 mV. (d) Comparison of the turnover frequencies of reported Co-based catalysts and ConIr1/Ni(OH)2 for the OER. (e) Tafel slopes of Ni(OH)2, Ir1/Ni(OH)2, Con/Ni(OH)2, and ConIr1/Ni(OH)2. (f) Chronopotentiometric curve of ConIr1/Ni(OH)2 toward the OER at a current density of 10 mA·cm−2 for 15 h.
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Morphological and structural characterization of ConIr1/Ni(OH)2 after the durability test. (a) HAADF-STEM image. (b) EDX elemental mapping images. (c) XRD pattern. (d) Co L-edge XAS spectra. (e) Ni L-edge XAS spectra. (f) Ni 2p XPS spectra.
