Synergistic effect of graphene oxide@phosphate-intercalated hydrotalcite for improved anti-corrosion and self-healable protection of waterborne epoxy coating in salt environments

Author(s): Chunlin Chen ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Yi He ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Guoqing Xiao ⁵ ^, ² ^, ³ ^, ⁴ , Fei Zhong ¹ ^, ² ^, ³ ^, ⁴ , Hongjie Li ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Youqing Wu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Jingyu Chen ⁶ ^, ⁷ ^, ⁸ ^, ⁹

Publication date (Electronic): 2019

Journal: Journal of Materials Chemistry C

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Waterborne epoxy coatings (WECs), with significant anti-corrosion and self-healable performance were obtained through electrostatic self-assembly of graphene oxide (GO) and phosphate (PO ₄ ³⁻)-intercalated hydrotalcite (PIH).

Abstract

Waterborne epoxy coatings (WECs), with significant anti-corrosion and self-healable performance, effectively inhibit the corrosion of the metal surface in salt environments and are highly desirable; however, it is still a challenge to achieve them; herein, we have demonstrated graphene oxide (GO) and phosphate (PO ₄ ³⁻)-intercalated hydrotalcite (PIH) formed via electrostatic self-assembly to overcome this problem. The corrosion protective properties were characterized by an electrochemical experiment and a salt spray test. Due to the synergistic effect of the strong barrier performance of GO plus hydrotalcite, good dispersion of PIH enabled by GO, and the formation of a phosphate film at the metal/coating interface owing to sustainable ion-exchange between Cl ⁻ and PO ₄ ³⁻, the GO@PIH-based WECs exhibit superior anti-corrosion ability. By comparison, the failure time of the GO@PIH-based WECs was significantly prolonged to 30 days when compared with that of GO/WECs (15 days) and PIH/WECs (7 days). Interestingly, the GO@PIH/WECs also exhibit self-healing performance when the corrosive ions reach the metal/coating interface; this is attributed to PO ₄ ³⁻ released from the PIH nanoplates; hence, the failure time of the GO@PIH/WECs is further prolonged.

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Enhancing lithium-sulphur battery performance by strongly binding the discharge products on amino-functionalized reduced graphene oxide.

Zhiyu Wang, Yanfeng Dong, Hongjiang Li … (2014)

Lithium-sulphur batteries are one very appealing power source with high energy density. But their practical use is still hindered by several issues including short lifespan, low efficiency and safety concern from the lithium anode. Polysulphide dissolution and insulating nature of sulphur are generally considered responsible for the capacity degradation. However, the detachment of discharge products, that is, highly polar lithium sulphides, from nonpolar carbon matrix (for example, graphene) has been rarely studied as one critical factor. Here we report the strongly covalent stabilization of sulphur and its discharge products on amino-functionalized reduced graphene oxide that enables stable capacity retention of 80% for 350 cycles with high capacities and excellent high-rate response up to 4 C. The present study demonstrates a feasible and effective strategy to solve the long-term cycling difficulty for lithium-sulphur batteries and also helps to understand the capacity decay mechanism involved.