Stoichiometry-grain size-specific capacitance interrelationships in nickel oxide.

ABSTRACT: Nickel oxide exhibits almost the highest theoretical specific capacitance (C _s), which includes contributions from non-faradaic double layer charging and faradaic OH^- adsorption. However, the realistic and tangible C _s is due to the faradaic process, which can be influenced by chemical (i.e. stoichiometry) and structural (i.e. grain size) changes. Hence, it is necessary to investigate the interrelationships among chemical and structural features and charge storage capacity. Here, a non-stoichiometric nickel oxide (Ni _x O) containing Ni²⁺ and Ni³⁺ was synthesized by a sol-gel method at 620, 720 and 920 °C using Ni(NO₃)₂·6H₂O and citric acid. The grain size as

SUBMITTER: Parashtekar A 

PROVIDER: S-EPMC8984869 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature