The porous Ti/Sb-SnO₂/Ni-Ce-PbO₂ electrode was prepared by using a porous Ti plate as a substrate, an Sb-doped SnO₂ as an intermediate, and a PbO₂ doped with Ni and Ce as an active layer. The surface morphology and crystal structure of the electrode were characterized by scanning electron microscope(SEM), energy dispersive spectrometer(EDS), and X-Ray diffraction(XRD). The electrochemical performance of the electrodes was tested by linear sweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and electrode life test. The results show that the novel porous Ni-Ce-PbO₂ electrodes with larger active surface area have better electrochemical activity and longer electrode life than porous undoped PbO₂ electrodes and flat Ni-Ce-PbO₂ electrodes. In this work, the removal of Cl⁻ in simulated wastewater on three electrodes was also studied. The results show that the removal effect of the porous Ni-Ce-PbO₂ electrode is obviously better than the other two electrodes, and the removal rate is 87.4%, while the removal rates of the other two electrodes were 72.90% and 80.20%, respectively. In addition, the mechanism of electrochemical dechlorinating was also studied. With the progress of electrolysis, we find that the increase of OH^- inhibits the degradation of Cl⁻, however, the porous Ni-Ce-PbO₂ electrode can effectively improve the removal of Cl⁻.

The emissions of SF ₆ have been restricted owing to 3400 years of atmospheric lifetime and high global warming potential (GWP) as an insulating gas in gas‐insulated electrical equipment. In this study, HFO‐1336mzz(E) and N ₂ /CO ₂ mixtures are proposed as SF ₆ substitutes for their short atmospheric lifetime, low GWP and superior insulation performance. The GWP of HFO‐1336mzz(E) is only 18 and its atmospheric lifetime is days to weeks. The breakdown voltage of 25% HFO‐1336mzz(E) and N ₂ /CO ₂ mixtures is about 85% that of pure SF ₆ under alternating current. The self‐recovery ability of HFO‐1336mzz(E) and CO ₂ mixtures is superior to that of HFO‐1336mzz(E) and N ₂ mixtures. The decomposition characteristic of HFO‐1336mzz(E) shows that a tiny amount of its gas might initiate a carbonisation reaction to form carbon after multiple breakdown tests, which is verified by observations using energy dispersive X‐rays spectroscopy and scanning electron microscope. The acute toxicity test of HFO‐1336mzz(E) indicates that the gas is non‐toxic. The results show that HFO‐1336mzz(E) and N ₂ /CO ₂ mixtures are potential substitutes for SF ₆ in electrical applications.

A self-assembled MnO₂/Mxene composite film was compounded with MXene nanosheets and layered crystalized MnO₂ nanosheets using surfactant sodium dodecyl sulfate (SDS) as a soft template. The obtained material was characterized by XRD, SEM, XPS, and FT-IR, which showed that the films have large surface-active functional groups and metal ion flow channels, indicating that the MnO₂/Mxene composite films were capable of both the chemical and physical adsorption of the target heavy metal ions. The analysis of adsorption performance showed that the Pb²⁺ removal rate reached 98.3% at pH 6 and an initial Pb²⁺ concentration of 30 mg/L, while the maximum adsorption capacity could reach 1235 µmol/g. In addition, the MnO₂/Mxene composite film had specific selectivity and recyclability. The reuse study verified that the Pb²⁺ removal rate reached 96.4% after five cycles, confirming that the MnO₂/Mxene composite films had practical application prospects.