Aqueous Formate‐Based Li‐CO2 Battery with Low Charge Overpotential and High Working Voltage
Aqueous Formate‐Based Li‐CO2 Battery with Low Charge Overpotential and High Working Voltage
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DOI：
10.1002/aenm.202101630
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发表时间：
2021-07
影响因子：
27.8
通讯作者：
Hairong Xue;H. Gong;Xueyi Lu;Bin Gao;Tao Wang;Jianping He;Y. Yamauchi;T. Sasaki;R. Ma
中科院分区：
文献类型：
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作者：
Hairong Xue;H. Gong;Xueyi Lu;Bin Gao;Tao Wang;Jianping He;Y. Yamauchi;T. Sasaki;R. Ma
Li-CO2电池（LCOB）被认为是实现高效碳封存和能源储存的重要策略。然而，大多数典型的放电产物（Li 2CO 3和C）是不溶性的和化学稳定的，并且需要高充电过电位（3.5- 4.5V）来分解。在此，提出了一种新的水性LCOB与甲酸（HCOOH）作为放电产物。可溶性HCOOH可以直接用于充电过程中，而无需任何进一步的纯化或压缩，从而实现非常容易的电化学循环。具有高电化学表面积的纳米多孔Pd膜对CO2还原和甲酸氧化表现出高的双功能性能。因此，组装的LCOB实现了2.61 V的高工作电位平台，而充电电位显著降低至2.87 V，提供了91%的最高能效。目前的工作展示了一种全新的水性LCOB，其中HCOOH作为放电产物，用于利用CO2作为电源。
Li‐CO2 batteries (LCOBs) are considered to be an important strategy toward efficient carbon sequestration and energy storage. However, most typical discharge products (Li2CO3 and C) are insoluble and chemically stable, and require a high charge overpotential (≈3.5–4.5 V) to be decomposed. Herein, a novel aqueous LCOB with formic acid (HCOOH) as the discharge product is proposed. The soluble HCOOH can be directly utilized in the charge process without any further purification or compression, realizing a very facile electrochemical cycle. Nanoporous Pd films with a high electrochemical surface area exhibit a high bifunctional performance toward both CO2 reduction and formic acid oxidation. Accordingly, the assembled LCOB achieves a high working potential plateau of 2.61 V whereas the charge potential is significantly lowered to 2.87 V, delivering the highest energy efficiency of 91%. The present work demonstrates a brand‐new aqueous LCOB with HCOOH as the discharge product for utilizing CO2 as power source.