This technology describes a microwave-assisted hydrothermal process for nucleating and growing Al-substituted alpha-Ni(OH)2 nanosheets directly onto a carbon nanofiber paper, forming a 3D electrically wired network. This innovative method utilizes mildly acidic conditions, offering a unique approach to creating cathode materials for Ni/Zinc batteries with significantly enhanced capacity retention and cycle life. The process is versatile, allowing for the synthesis of various metal hydroxides or oxides with controlled compositions, morphologies, and thicknesses, directly connected to diverse 3D-electrically wired networks.