Thermochemical energy storage offers a cost-effective and efficient approach for storing thermal energy at high temperature (∼1100 °C) for concentrated solar power and large-scale long duration energy storage. SrCO is a potential candidate as a thermal energy storage material due to its high energy density of 205 kJ/mol of CO during reversible CO release and absorption. However, it loses cyclic capacity rapidly due to sintering. This study determined that the cyclic capacity of SrCO was enhanced by the addition of either reactive SrTiO or inert SrZrO, where the molar ratios of SrCO to SrZrO were varied from 1:0.125 to 1:1. Thermogravimetric analysis over 15 CO sorption cycles demonstrated that both materials retained ∼80 % of their maximum cyclic capacity on the milligram scale. Repeated measurements using gram scale samples revealed a decrease in maximum capacity to 11 % using a sample of SrCO – 0.5 SrZrO over 53 cycles, while the use of SrTiO additives allowed for the retention of 80 % maximum capacity over 55 cycles. These findings highlight the potential of reactive additives in enhancing the performance of thermochemical energy storage systems, while providing valuable insights for the development of cost-effective materials.

中文翻译：

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SrCO3 与 SrTiO3 或 SrZrO3 复合材料的热化学储能

热化学储能提供了一种经济高效的方法，用于在高温（~1100°C）下存储热能，用于聚光太阳能和大规模长期储能。SrCO在可逆CO释放和吸收过程中具有205 kJ/mol CO的高能量密度，是一种潜在的热能储存材料。然而，由于烧结，它会迅速失去循环能力。这项研究确定，通过添加反应性 SrTiO 或惰性 SrZrO 可以增强 SrCO 的循环容量，其中 SrCO 与 SrZrO 的摩尔比在 1:0.125 至 1:1 之间变化。超过 15 个 CO 吸附循环的热重分析表明，两种材料均保留了毫克级最大循环容量的 80%。使用克级样品的重复测量表明，使用 SrCO – 0.5 SrZrO 样品经过 53 个循环后，最大容量下降至 11%，而使用 SrTiO 添加剂则可以在 55 个循环中保留 80% 的最大容量。这些发现凸显了反应性添加剂在增强热化学储能系统性能方面的潜力，同时为开发具有成本效益的材料提供了宝贵的见解。