Adsorption of SF(6) Decomposed Products on ZnO-Modified C(3)N: A Theoretical Study

SF(6), as an outstanding insulation medium, is widely used in the high-voltage insulation devices, guaranteeing the safe operation of the power system. Nevertheless, the inevitable partial discharge in a long-running device causes the decomposition of SF(6) and deteriorates its insulation performance. In this work, DFT calculations were performed to study the adsorbing and sensing properties of ZnO-modified C(3)N (ZnO-C(3)N) nanosheet towards SF(6) decomposed products, in order to propose a novel nano-candidate for evaluating the operation status of SF(6) insulation devises. We first investigated the structure of ZnO-C(3)N monolayer and then simulated its adsorption behaviour upon four typical SF(6) decomposed species, namely H(2)S, SO(2), SOF(2), and SO(2)F(2). It is found that the ZnO-C(3)N monolayer can exhibit desirable reactivity and sensitivity on SO(2), SOF(2), and SO(2)F(2), leading to the intense deformation of gas molecules and large adsorption energies. These consequences allow the potential application of gas adsorbent based on ZnO-C(3)N monolayer for removing impurity gases from SF(6) insulation equipment. According to the analysis, it is supposed that ZnO-C(3)N monolayer is qualified to be used in maintaining insulation strength and ensuring the safe operation of power system.