Preparation of a Peony-liked 3-D Hydrotalcite and Its Electrochemical Performance as a Zinc Negative Electrode

Publication date: Available online 25 March 2019Source: Materials Research BulletinAuthor(s): Fan Cui, Zhanhong Yang, Lili Liu, Jinlei Meng, Yinan JiangABSTRACTUrea was selected as precipitant to prepare a special structure of Peony-liked 3D Zinc-Aluminum layered double hydroxides (P-LDH) through hydrothermal method. The as-prepared materials were researched through morphology characterizations and electrochemical measurements. It was found that the 3D structure of P-LDH consisted by individual sheets forming a Peony-type morphology with excellent crystal. Electrochemical measurements revealed that P-LDH exhibited improved performances, such as better cyclic stabilities, smaller impedance, bigger final discharge specific capacity and retention rate, higher utilization of active materials and more rapidly redox reaction. As a result, the prepared material possesses great stabilities in the whole 1000 cycles, 365 mA h g-1 of the final discharge specific capacity and 96.3% of a retention rate. This improvement was attributed to the unique 3D peony-liked frame, which possesses bigger channels for electrolyte penetrating-diffusing and exposes more surface to provide active sites for charging-discharging. In addition, the formation mechanism of P-LDH is proposed.Graphical abstractPeony-like 3-D Hydrotalcite as a Zinc Negative Electrode, commendably satisfying the requirement of ordered distributed morphology, possesses great stability in charge-discharge cycles in the whole 100...

Source: Materials Research Bulletin - March 26, 2019 Category: Materials Science Source Type: research