一种高能水系 Zn‖NO2 电化学电池：一种用于 NO2 固定和发电的新策略,Energy & Environmental Science

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一种高能水系 Zn‖NO2 电化学电池：一种用于 NO2 固定和发电的新策略
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2023-01-24 , DOI: 10.1039/d2ee03749a
Longtao Ma _{1,

2} , Shengmei Chen ₂ , Wenhao Yan ₂ , Guobin Zhang ₂ , Yiran Ying ₃ , Haitao Huang ₃ , Derek Ho ₂ , Wei Huang ₁ , Chunyi Zhi _{2,

4}

Affiliation

_{废气中的氮氧化物 (NO 2} )造成的空气污染是一个根深蒂固的问题，因此迫切需要新的捕获和减排技术。同时，将 NO ₂电催化转化为增值化学品是缓解人为造成的全球氮循环失衡的有前途的策略。在这里，我们提出了一种基于水性 Zn‖NO ₂系统的电化学电池，沉积的纳米 NiO 催化剂作为阴极，金属锌箔作为阳极，ZnCl ₂水溶液作为电解质。重要的是，电解质可以有效地捕获 NO ₂，然后将其转化为 NO ₂^-并最终转化为增值的 NH ₃，同时产生电力。作为概念证明，已制造出一种电池，它对可逆的 NO ₂还原和析出反应表现出双功能活性和稳定性（>100 小时）。^{来自软包电池 (2.4 Ah) 的 553.2 W h kg -1}_电池/1589.6 W h L ^-1_电池的高电池级能量密度已经实现。作为一项额外的绿色环保功能，Zn‖NO _{2电池产生的 NO}₂⁻随后通过自供电机制转化为 NH ₃，从而在单个设备中完成氮循环中的多个关键转化步骤，从而铺平了道路到可扩展、高度集成的解决方案。

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A high-energy aqueous Zn‖NO2 electrochemical cell: a new strategy for NO2 fixation and electric power generation

Air pollution by nitrogen oxides (NO₂) from exhaust gas is a deep-seated problem, thus urgently calling for new capture and abatement technologies. Meanwhile, the electrocatalytic conversion of NO₂ to value-added chemicals is a promising strategy for mitigating human-caused imbalances of the global nitrogen cycle. Here, we propose an electrochemical cell based on an aqueous Zn‖NO₂ system with a nano-NiO catalyst deposited as the cathode, a metallic Zn foil as the anode and a ZnCl₂ aqueous solution as the electrolyte. Importantly, the electrolyte can efficiently capture NO₂, then convert it to NO₂⁻ and eventually to value-added NH₃, while simultaneously producing electric power. As proof of concept, a battery has been fabricated, which exhibits bifunctional activity and stability (>100 h) towards reversible NO₂ reduction and evolution reactions. A high cell-level energy density of 553.2 W h kg⁻¹_cell/1589.6 W h L⁻¹_cell from pouch cells (2.4 Ah) has been achieved. As an additional green feature, the produced NO₂⁻ by the Zn‖NO₂ cell is subsequently converted to NH₃ by a self-powered mechanism, thereby servicing multiple key conversion steps in the nitrogen cycle all within a single device, paving the way to scalable, highly integrated solutions.

更新日期：2023-01-24

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