“Revitalizing” degraded solid oxide fuel cells in sour fuels for bifunctional oxygen catalysis in zinc–air batteries,Green Chemistry

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“Revitalizing” degraded solid oxide fuel cells in sour fuels for bifunctional oxygen catalysis in zinc–air batteries
Green Chemistry ( IF 9.3 ) Pub Date : 2020-08-19 , DOI: 10.1039/d0gc01699c
Xiaojuan Cao _{1,

2,

3,

4,

5} , Ying Yang _{3,

4,

5,

6,

7} , Xiaoyu Yan _{1,

2,

3,

4} , Norbert J. Geels _{8,

9,

10,

11} , Jing-Li Luo _{12,

13,

14,

15} , Ning Yan _{1,

2,

3,

4,

8}

Affiliation

Electrochemical devices are central to sustainable energy storage and conversion. Currently, most of the spent devices end up in landfills or the conventional toxic and energy-intensive metal extraction processes. Advanced reuse and re-valorization practices are lacking due to both technical and economic barriers. To address this growing concern, we herein demonstrate that the fully degraded electrode of the state-of-the-art anode-supported solid oxide fuel cells (SOFCs) can be “revitalized” in situ during the operation. The facile treatment involves fueling the SOFC with the readily available fuels containing H₂S and the electrode pulverization. The resulting powder comprises porous particles with mixed nickel sulfide nanoclusters dispersed on Y-stabilized ZrO₂ (NiS_x/YSZ) which enables superior activity in both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Its voltage gap between the ORR half-wave potential and OER potential at the benchmark 10 mA cm⁻² reached 0.74 V, rendering stable and efficient performance in a rechargeable Zn–air battery. This work might boost the awareness of treating end-of-life electrochemical materials sustainably and pave new ways for the circular economy.

中文翻译：

“振兴”酸性燃料中降解的固体氧化物燃料电池，用于锌空气电池中的双功能氧催化

电化学设备对于可持续的能源存储和转换至关重要。当前，大多数用过的设备最终会进入垃圾填埋场或传统的有毒和高能耗金属提取工艺。由于技术和经济上的障碍，缺乏先进的重用和重新估价做法。为了解决这一日益严重的问题，我们在本文中证明，在操作过程中，可以将原先阳极支撑的固体氧化物燃料电池（SOFC）的完全降解的电极原位“活化” 。简便的处理方法包括用现成的含有H ₂ S的燃料为SOFC燃料和电极粉碎。所得粉末包含具有分散在Y稳定的ZrO ₂上的混合硫化镍纳米簇的多孔颗粒（NiS _x / YSZ）在氧还原反应（ORR）和氧释放反应（OER）中均具有出色的活性。在基准10 mA cm ^-2时，ORR半波电势和OER电势之间的电压差达到0.74 V，从而在可充电锌空气电池中提供了稳定而高效的性能。这项工作可能会提高人们对以可持续方式处理报废电化学材料的认识，并为循环经济铺平新道路。

更新日期：2020-09-21

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