Preparation Of Compound Electrodes About Metal Oxide On Nickel Foam And Research In Electrochemical Properties

Relative to the supercapacitor, battery has lower power density, leading to low service life. A large number of waste batteries contain varieties of heavy metal, bring great harm to the environment. Electrode materials are the core component of supercapacitors and electrochemical detection, Different materials show different electrochemical performance. This paper chose nickel foam as carrier and current collector, and hydrothermal synthesis binary metallic oxides on the nickel foam substrate, this constitutes self-supported composite electrode. It could effectively solve the problem of low battery power density. On the other hand, it could apply in heavy metal ions detection. As follows is the main content:1.?Co,Mn?₃O₄ was deposited on the surface of three dimensional nickel foam by hydrothermal synthesis method, constructed the self-support composite electrode, and getting characterization on the microscopic morphology and structure characteristics. In the three-electrode system, Studing the cyclic volt ampere characteristics and AC impedance, and testing about the charge and discharge at the current properties and cycle stability?1000 times?. The specific capacity was 803.7 F/g at 1 A/g, the outstanding performance showed its advantages as electrode materials of supercapacitor; the composite electrode were carried out to study the electrochemical response of Hg²⁺ and Pb²⁺: In the buffer solutions of p H=4 and HAc-Na Ac, the ions concentration range is 0.5⁴ ?M,Respectively, the detection limit?LOD? were 3.60× 10-4 ?M and 3.76×10-4 ?M by SWASV method, and analysising the recovery ratio test of sample.2. Compounding NiCo₂O₄ on the surface of nickel foam, which constituted self-supported composite electrode. Analysising its morphology on the surface and structure. Studying its higher specific capacity, cycle stability and retention rate in supercapacitor. The specific capacity was 566 F/g at 1A/g, which showed the excellent performance in supercapacitor. Researching the electrochemical response of Cd²⁺, Pb²⁺, Cu²⁺ and Hg²⁺ by the self-supported composite electrode. In the PBS buffer solution of p H=7, the concentration range was 3.25⁴.5 ?M, the detection limit of Cd²⁺, Pb²⁺, Cu²⁺ and Hg²⁺ were respectively 1.40×10-4, 1.46×10-4, 2.40×10-4, 1.56×10-4 ?M; Range was 0.625².625 ?M, the LOD were 6.16×10-4, 4.30×10-4, 2.94×10-4, 1.50×10-4 ?M; And range was 0.025⁰.25 ?M, the LOD were 0.36×10-4, 0.30×10-4, 0.49× 10-4, 0.48×10-4 ?M, and analysising the recovery ratio test of sample. Realize the real-time, on-line detection of the variety of heavy metal ions in the study, providing a fast and efficient method of heavy metal ions detection.