The Cu doped ramsdellite MnO₂ nanosheet samples with different Cu/Mn molar ratio were prepared by a facile hydrothermal redox reaction among Cu(NO₃)₂, Mn(NO₃)₂, and KMnO₄ at 60 °C. They were characterized by ICP-OES, XRD, TEM, SEM, N₂ adsorption, XPS, UV-vis-IR absorption, etc. The Cu doped ramsdellite MnO₂ nanosheet samples demonstrate highly efficient photothermocatalytic activity and very good catalytic stability for the catalytic purification of CO as one of poisonous air pollutants under the full solar spectrum infrared irradiation. Compared to the pure ramsdellite MnO₂ nanosheet sample and TiO₂(P25), the photothermocatalytic activity of the optimum Cu doped ramsdellite MnO₂ nanosheet sample under the full solar spectrum irradiation is enhanced by 2.3, 281.7 times, respectively. The Cu doped ramsdellite MnO₂ nanosheet sample also demonstrates highly efficient catalytic activity even under the λ > 830 nm infrared irradiation. The highly efficient catalytic activity of the Cu doped ramsdellite MnO₂ nanosheet sample derives from efficient solar-light-driven thermocatalysis because of its strong absorption across the entire full solar spectrum and high thermocatalytic activity. The Cu doping considerably enhances the lattice oxygen activity of ramsdellite MnO₂, thus promoting its thermocatalytic activity. A novel photoactivation, completely unlike the well-known photocatalysis on photocatalytic semiconductors such as TiO₂, is discovered to further enhance the solar-light-driven thermocatalytic activity. We combine the experimental evidence of CO-TPR and DFT calculation to reveal the origin of the novel photoactivation: the irradiation considerably enhances the lattice oxygen activity of the Cu doped ramsdellite MnO₂ nanosheets, thus accelerating their solar-light-driven thermocatalytic activity.

通过在60°C下进行Cu（NO ₃）₂，Mn（NO ₃）₂和KMnO _4的快速水热氧化还原反应，制备了具有不同Cu / Mn摩尔比的Cu掺杂斜方锰矿MnO ₂纳米片样品。它们具有ICP-OES，XRD，TEM，SEM，N ₂吸附，XPS，UV-vis-IR吸收等特征。Cu掺杂的斜方锰矿MnO ₂纳米片样品表现出高效的光热催化活性和非常好的催化稳定性。在全太阳光谱红外辐射下净化作为有毒空气污染物之一的CO。与纯斜方锰矿MnO ₂纳米片样品和TiO相比_如图2（P25）所示，在全太阳光谱辐射下，最佳Cu掺杂的斜方锰矿MnO ₂纳米片样品的光热催化活性分别提高了2.3倍和281.7倍。铜掺杂的斜方锰矿MnO ₂纳米片样品甚至在λ> 830 nm红外辐射下也表现出高效的催化活性。铜掺杂斜方锰矿MnO ₂纳米片样品的高效催化活性源于有效的太阳光驱动热催化，因为它在整个完整太阳光谱中具有很强的吸收能力，并且具有很高的热催化活性。铜的掺杂显着增强了斜方锰矿MnO ₂的晶格氧活性，从而促进其热催化活性。发现一种完全不同于众所周知的对光催化半导体如TiO _2的光催化作用的新型光活化作用，可以进一步增强太阳光驱动的热催化活性。我们结合了CO-TPR和DFT计算的实验证据，揭示了新型光活化的起源：辐射大大增强了掺Cu斜方锰矿MnO ₂纳米片的晶格氧活性，从而加速了它们在太阳光驱动下的热催化活性。