The excessive consumption of synthesized materials and enhanced environmental protection protocols necessitate the exploitation of desirable functionalities to handle our solid waste. Through a simple calcination and composite strategy, this work envisages the first application of biocalcite derived from the waste of crayfish shells as an electrolyte for solid oxide fuel cells (SOFCs), which demonstrates encouraging performances within a low temperature range of 450–550 °C. The single cell device, assembled from calcined waste shells at 600 °C (CWS600), enables a peak power density of 166 mW cm^–2 at 550 °C, and further renders 330 and 256 mW cm^–2 after compositing with perovskite La_0.6Sr_0.4Co_0.8Fe_0.2O_3-δ (LSCF) and layer-structured LiNi_0.8Co_0.15Al_0.05O₂ (LNCA), respectively. Notably, an oxygen-ion blocking fuel cell is used to confirm the proton-conducting property of CWS600 associated electrolytes. The practical potential of the prepared fuel cells is also validated when the cell voltage of the cell is kept constant value over 10 h during a galvanostatic operation using a CWS600-LSCF electrolyte. These interesting findings may increase the likelihood of transforming our solid municipal waste into electrochemical energy devices, and also importantly, provide an underlying approach for discovering novel electrolytes for low-temperature SOFCs.

中文翻译：

---

生物源方解石作为固体氧化物燃料电池的电解质：利用废壳的策略

合成材料的过度消耗和增强的环境保护协议使得必须利用所需的功能来处理我们的固体废物。通过简单的煅烧和复合策略，这项工作设想了将小龙虾壳废料中的生物方解石首次用作固体氧化物燃料电池（SOFC）的电解质，这证明了在450–550°C的低温范围内具有令人鼓舞的性能。由煅烧后的废壳在600°C（CWS600）组装而成的单电池设备在550°C时可实现166 mW cm ^–2的峰值功率密度，并与钙钛矿La _0.6混合后可提供330和256 mW cm ^–2的峰值功率Sr _0.4 Co _0.8铁_分别为0.2 O3 _-δ（LSCF）和层状LiNi _0.8 Co _0.15 Al _0.05 O ₂（LNCA）。值得注意的是，使用阻隔氧离子的燃料电池来确认CWS600相关电解质的质子传导性能。当使用CWS600-LSCF电解质进行恒电流运行时，如果电池的电池电压在10小时内保持恒定值，则可以验证所制备燃料电池的实际潜力。这些有趣的发现可能会增加将我们的固体城市垃圾转化为电化学能源设备的可能性，并且重要的是，还为发现用于低温SOFC的新型电解质提供了一种潜在的方法。