期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202004210
关键词
periodic anodizing technique; ultrastable zinc metal anode; zinc ion aqueous battery; Zn@ZnO hexagonal pyramid array
类别
资金
- NRF - National Research Foundation under the Ministry of Science and ICT, Republic of Korea [NRF-2019R1A2B5B03001772, NRF-2019H1D3A1A01069779]
- Korea Institutional Program [2E30371]
- National Research Foundation of Korea [2019H1D3A1A01069779] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Here, an electrode comprising a Zn hexagonal pyramid array (HPA) coated with a functionalized ZnO layer (Zn@ZnO HPA) is prepared using a periodic anodizing technique. The HPA structure markedly increases the electroactive surface area of Zn anode, thus decreasing the local current density. Furthermore, the functionalized ZnO coating layer has a gradient thickness that plays an important role in the selective deposition of Zn ions and the mitigation of side reactions at the interface. The electrochemical stability of the Zn@ZnO HPA electrode, which is closely related to the electroactive surface area and charge transfer resistance, is determined by the split value, i.e., ratio of current-off to current-on time, a parameter of the periodic anodizing process. Compared with the pristine Zn-based symmetric cell, the Zn@ZnO HPA-based symmetric cell is safely operated in the investigated experimental range with the 10-fold improved running life and 25-fold enhanced current density without Zn dendrite growth. Moreover, the Zn@ZnO HPA/MnO(2)battery exhibits outstanding long-term cyclability (nearly 100%) with greater than 99% Coulombic efficiency after 1000 cycles at a current density of 9 A g(-1). This periodic anodizing technique for ultrastable Zn metal anodes is expected to contribute to the development of inherently safe energy storage systems.
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