Enabling High-Rate and High-Areal-Capacity Zn Deposition via an Interfacial Preferentially Adsorbed Molecular Layer,ACS Energy Letters

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Enabling High-Rate and High-Areal-Capacity Zn Deposition via an Interfacial Preferentially Adsorbed Molecular Layer
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-11-17 , DOI: 10.1021/acsenergylett.2c02339
Ping Xiao ₁ , Yu Wu ₁ , Jinzhou Fu ₁ , Jianing Liang ₁ , Yinghe Zhao ₁ , Ying Ma ₁ , Tianyou Zhai ₁ , Huiqiao Li ₁

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The poor electrochemical performance of Zn anodes at high current densities and large areal capacities is a tough challenge due to the accelerated dendrite growth and worsened reaction irreversibility. Herein, an ester-based organic, γ-butyrolactone (GBL), is utilized to regulate the deposition behaviors and performance of the Zn anode. Through DFT calculations, the strong interactions of GBL molecules with Zn²⁺ and Zn slab were confirmed. In addition, improved interfacial properties were achieved, including the reduced potential of hydrogen evolution and enhanced wetting ability. Significantly, the concentration distribution difference of GBL between the Zn/electrolyte interface and the electrolyte was investigated by Raman spectra, and the interfacial preferential adsorption of GBL was highlighted. Electrochemical tests indicated that the supporting current density and the cycle life of the Zn anode using GBL could reach 30 mA cm^–2 and 5000 h, respectively, proving the effectiveness of this strategy.

中文翻译：

通过界面优先吸附分子层实现高速率和高面积容量的锌沉积

由于加速的枝晶生长和恶化的反应不可逆性，锌阳极在高电流密度和大面积容量下的电化学性能差是一个严峻的挑战。在此，基于酯的有机γ-丁内酯（GBL）用于调节锌阳极的沉积行为和性能。通过DFT计算，GBL分子与Zn ^{2+的强相互作用}和锌板被确认。此外，界面性能得到改善，包括降低析氢潜力和增强润湿能力。值得注意的是，通过拉曼光谱研究了 Zn/电解质界面和电解质之间 GBL 的浓度分布差异，突出了 GBL 的界面优先吸附。电化学测试表明，使用GBL的Zn负极的支撑电流密度和循环寿命分别可以达到30 mA cm ^-2和5000 h，证明了该策略的有效性。

更新日期：2022-11-17

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