A Monolithic High‐Entropy Aerogel Anode for Stable and Low‐Overpotential Oxygen Evolution
A Monolithic High‐Entropy Aerogel Anode for Stable and Low‐Overpotential Oxygen Evolution
研究概述
将高熵体系多样电子环境与气凝胶多孔结构结合，构筑整体式高熵气凝胶析氧电极，在500 mA/cm²下过电位仅208 mV。计算表明氧p带调节有助于平衡中间体吸附；原位拉曼显示Cr/V部分浸出促进电极重构为活性金属羟基氧化物。
谱图与表征信息
FIGURE 4 Characterization of chemical states of NiCoFeCrV@Ni aerogel. (a) Ni K-edge XANES spectra of the Ni foil, NiO, LiNiO2, and NiCoFeCrV@Ni. (b) FT-EXAFS spectra of the Ni foil, NiO, LiNiO2, and NiCoFeCrV@Ni in the 0–6 Å region. (c) Wavelet transforms of the k2-weighted EXAFS signals of Ni in the NiCoFeCrV@Ni. (d) Co K-edge XANES spectra of the Co foil, CoO, Co3O4, and NiCoFeCrV@Ni. (e) FT-EXAFS spectra of the Co foil, CoO, Co3O4, and NiCoFeCrV@Ni in the 0–6 Å region. (f) Wavelet transforms of the k2-weighted EXAFS signals of Co in the NiCoFeCrV@Ni. (g) Fe K-edge XANES spectra of the Fe foil, Fe2O3, FeO, and NiCoFeCrV@Ni. (h) FT-EXAFS spectra of the Fe foil, Fe2O3, FeO, and NiCoFeCrV@Ni in the 0–6 Å region. (i) Wavelet transforms of the k2-weighted EXAFS signals of Fe in the NiCoFeCrV@Ni. (j) Cr K-edge XANES spectra of the Cr foil, Cr2O3, CrO3, and NiCoFeCrV@Ni. (k) FT-EXAFS spectra of the Cr foil, Cr2O3, CrO3, and NiCoFeCrV@Ni in the 0–6 Å region. (l) Wavelet transforms of the k2-weighted EXAFS signals of Cr in the NiCoFeCrV@Ni. (m) V K-edge XANES spectra of the V foil, VO2, V2O5, and NiCoFeCrV@Ni. (n) FT- EXAFS spectra of the V foil, VO2, V2O5, and NiCoFeCrV@Ni in the 0–6 Å region. (o) Wavelet transforms of the k2-weighted EXAFS signals of V in the NiCoFeCrV@Ni.