Cation Doping Approach for Nanotubular Hydrosilicates Curvature Control and Related Applications

The past two decades have been marked by an increased interest in the synthesis and the properties of geoinspired hydrosilicate nanoscrolls and nanotubes. The present review considers three main representatives of this group: halloysite, imogolite and chrysotile. These hydrosilicates have the ability of spontaneous curling (scrolling) due to a number of crystal structure features, including the size and chemical composition differences between the sheets, (or the void in the gibbsite sheet and SiO2 tetrahedron, in the case of imogolite). Mineral nanoscrolls and nanotubes consist of the most abundant elements, like magnesium, aluminium and silicon, accompanied by uncontrollable amounts of impurities (other elements and phases), which hinder their high technology applications. The development of a synthetic approach makes it possible to not only to overcome the purity issues, but also to enhance the chemical composition of the nanotubular particles by controllable cation doping. The first part of the review covers some principles of the cation doping approach and proposes joint criteria for the semiquantitative prediction of morphological changes that occur. The second part focuses on some doping-related properties and applications, such as morphological control, uptake and release, magnetic and mechanical properties, and catalysis.

Lewis acid activated CO2 reduction over a Ni modified Ni-Ge hydroxide driven by visible-infrared light

Improvement of light harvesting and reaction kinetics is of great importance for achieving efficient solar-driven CO₂ reduction. Here, a Ni modified low-crystalline Ni-Ge containing hydroxide with Lewis acid sites was synthesized in highly reductive NaBH₄ solution and exhibited 9.3 μmol g_cat.^-1 h^-1 CO and 3.5 μmol g_cat.^-1 h^-1 CH₄ generation rates under visible light irradiation, and even achieved a 3.8 μmol g_cat.^-1 h^-1 CO evolution under infrared light irradiation. The wide-spectrum light harvesting resulted from the light absorption from the localized surface plasmonic resonance of Ni nanoparticles. In addition, the Lewis acid can activate C[double bond, length as m-dash]O bonds to decrease the kinetic barriers of CO₂ reduction. The design concept that rationally combines the advantages of expanding the spectral response and activating CO₂ may offer a new strategy for efficient solar energy utilization.