Study on Electrochemical Performance of Modified Zn Anodes on Different Metal Substrates

doi:10.3969/j.issn.1006-396X.2022.06.008

Abstract

Abstract:

This paper used metals (Ni,Cu,Sn,In and Ti) after smelting,forging,grinding,and polishing as substrates of Zn anode for aqueous Zn?ion batteries.In addition,the paper adopted XRD,SEM,in?situ optical microscope,and electrochemical characterization techniques to analyze hydrogen evolution rate in different substrates,Zn deposition/dissolution behaviors,galvanic corrosion,and cycling performance in different substrates.The results show that Sn and In can not only inhibit the side reactions caused by the contact between Zn and substrates，but also have excellent Zn?philic properties. However, the morphology of Zn deposition on Sn substrate surfaces is greatly affected by Sn crystal planes.In contrast,In is more suitable for the substrate of the Zn anode.

Key words: Substrates, Modified Zn anodes, Side reactions, Zn dendrite, Aqueous Zn?ion batteries

摘要：

将经过熔炼、锻造、打磨和抛光的金属Ni、Cu、Sn、In、Ti作为Zn负极的基底，制备了水系Zn离子电池。运用XRD、SEM、原位光学显微镜和电化学表征技术，分析了不同基底上的析氢速率、Zn在不同基底上的沉积/溶解行为、电偶腐蚀程度以及循环性能。结果表明，Sn和In不仅能够抑制Zn与基底之间引起的副反应，而且具有优异的亲Zn性能，但Zn在Sn基底表面沉积的形貌受Sn晶面的影响较大，In更适宜用作Zn负极的基底。

关键词: 基底, 改性Zn负极, 副反应, Zn枝晶, 水系Zn离子电池

CLC Number:

TQ152

Bo Tang, Qianfeng Liu, Hefei Fan, Qiang Zhang, Erdong Wang. Study on Electrochemical Performance of Modified Zn Anodes on Different Metal Substrates[J]. Journal of Petrochemical Universities, 2022, 35(6): 66-73.

唐波, 刘乾锋, 樊贺飞, 张强, 王二东. 不同金属基底改性Zn负极的电化学性能研究[J]. 石油化工高等学校学报, 2022, 35(6): 66-73.

Figures/Tables 14

Fig.1 XRD patterns of Ni,Cu,Sn,In and Ti

Fig.2 LSV curves of Ni, Cu, Sn, In and Ti

Fig.3 Voltage profiles of Zn deposition on various substrates

Fig.4 In?situ optical microscopy observations of the Zn plating and stripping process on Ni,Cu,Sn,In and Ti

Fig.5 XRD patterns of Zn/Ni,Zn/Cu,Zn/Sn,Zn/In and Zn/Ti

Fig.6 SEM images of Zn/Ni, Zn/Cu, Zn/Ti,Zn/Sn and Zn/In

Fig.7 Polarization curves of Zn/Ni, Zn/Cu, Zn/Sn, Zn/In and Zn/Ti

Table 1 Parameters for the corrosion of modified Zn anodes in 1 mol/L Na2SO4 solution

改性Zn负极	E_corr(vs.SCE)/mV	i_corr/(μA $⋅$ cm^-2)	β_c
Zn/Ni	-1.313 2	91.940	22.75
Zn/Cu	-1.262 6	624.360	77.16
Zn/Sn	-1.161 4	123.776	211.92
Zn/In	-1.120 4	82.008	229.97
Zn/Ti	-1.222 9	58.696	128.65

Table 1 Parameters for the corrosion of modified Zn anodes in 1 mol/L Na2SO4 solution

改性Zn负极	E_corr(vs.SCE)/mV	i_corr/(μA $⋅$ cm^-2)	β_c
Zn/Ni	-1.313 2	91.940	22.75
Zn/Cu	-1.262 6	624.360	77.16
Zn/Sn	-1.161 4	123.776	211.92
Zn/In	-1.120 4	82.008	229.97
Zn/Ti	-1.222 9	58.696	128.65

Fig.8 Cycling stabilities of the symmetrical cells with Zn/Ni,Zn/Cu,Zn/Sn,Zn/In,Zn/Ti

Fig.9 Nyquist plots of the symmetrical cells with modified Zn anodes after 1 cycle and after 50 cycles

Table 2 Charge transfer resistance Rct of modified Zn anodes after 1 and 50 cycles

改性Zn负极	R_ct/Ω
改性Zn负极	循环1圈	循环50圈
Zn/Ni	27.34	240.76
Zn/Cu	11.95	150.49
Zn/Sn	4.91	13.25
Zn/In	0.65	0.75
Zn/Ti	8.29	45.94

Fig.10 XRD patterns of Zn/Ni,Zn/Cu,Zn/Sn,Zn/In and Zn/Ti after 50 cycles

Fig.11 SEM images of Zn/Ni, Zn/Cu, Zn/Ti,Zn/In and Zn/Sn electrodes after 50 cycles

Fig.12 SEM images and corresponding elemental mappings of Zn/Sn and Zn/Sn electrodes after 50 cycles

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