A novel tube-in-tube nanostructure of MnO₂@ TiO₂ hybrid arrays has been obtained by a facile and controllable chemical bath deposition method. Scrutiny on the hybrid arrays indicates that the chemical bath deposition method favors the growth of the MnO₂ nanotubes with different diameter which can modulate the oxygen evolution reaction (OER) activity as well as bandgap width of the hybrid. In terms of OER activity, onset potential (E_s) shifts negatively from 0.698 V (vs.Ag/AgCl) of pristine titania nanotube arrays (TNAs) to 0.501 V of the hybrid loaded with 26.6%wt MnO₂, and the current density on the hybrid electrode can be significantly enhanced up to 20.87 mA/cm², almost 97 times higher than that on TNAs electrode (0.214 mA/cm²). Optical absorption measurement suggests that the bandgap width (E_g) can be tuned by loading MnO₂ onto the TNAs implying interaction between the MnO₂ and TNAs. The MnO₂@TiO₂ hybrid nanotube arrays may find promising potential in electrochemical water splitting, photocatalysis, thermocatalysis and other sustainable energy applications.

通过一种可控的化学浴沉积方法，获得了一种新型的MnO ₂ @ TiO ₂杂化阵列管内纳米结构。对混合体阵列的仔细研究表明，化学浴沉积方法有利于不同直径的MnO ₂纳米管的生长，这可以调节氧释放反应（OER）活性以及混合体的带隙宽度。就OER活性而言，起始电势（E _s）从原始二氧化钛纳米管阵列（TNA）的0.698 V（vs.Ag/AgCl）负移至负载26.6％wt MnO ₂的杂化体的0.501 V，电流密度负移混合电极上的电流可以显着提高到20.87 mA / cm ²，几乎是TNAs电极（0.214 mA / cm ²）的97倍。光吸收测量表明，可以通过将MnO ₂加载到TNA上来调整带隙宽度（E _g），这暗示了MnO ₂和TNA之间的相互作用。MnO ₂ @TiO ₂杂化纳米管阵列可能在电化学水分解，光催化，热催化和其他可持续能源应用中找到有前途的潜力。