Synthesis and Characterization of Doped Magnesium Hydroxide for Medium Heat Storage Application.
Synthesis and Characterization of Doped Magnesium Hydroxide for Medium Heat Storage Application.
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DOI：
10.3390/ma16186296
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发表时间：
2023-09-20
期刊：
影响因子：
--
通讯作者：
Boukhanouf R
中科院分区：
文献类型：
--
作者：
Albeladi N;Kur A;Mokaya R;Darkwa J;Roger-Lund S;Worall M;Calautit J;Boukhanouf R
英国每年产生的废热超过了全年的电力需求。因此，根据不同的温度有效地利用所有可用的废热源至关重要。通过适当的技术，这些废热的很大一部分有可能被回收再利用。热化学储能（TCES）提供了在各种温度下回收废热用于长期存储和应用的最佳机会。已经确定了具有氢氧化镁Mg（OH）2的TCES的潜力，但是其具有相对高的脱水温度，因此限制了其用于中温储热应用的潜力，中温储热应用占工业废热的很大比例。为此，已经开发了具有不同比例（5、10、15和20重量%）的硝酸钾（KNO 3）的掺杂Mg（OH）2的样品，并对其进行了表征以用于评估。结果表明，具有5wt%KNO3的Mg（OH）2样品实现了最佳结果，并且能够将纯Mg（OH）2的脱水温度从约317 °C降低到293 °C，储能容量从1246 J/g增加到1317 J/g。在对样品进行的非等温测试中，它还显示出单分散的表面拓扑结构和热稳定性，因此似乎具有在293 °C至400 °C范围内的中等储热应用的潜力。
The amount of waste heat generated annually in the UK exceeds the total annual electricity demand. Hence, it is crucial to effectively harness all available sources of waste heat based on their varying temperatures. Through suitable technologies, a substantial portion of this waste heat has the potential to be recovered for reutilization. Thermochemical energy storage (TCES) provides the best opportunities to recover waste heat at various temperatures for long-term storage and application. The potential of TCES with magnesium hydroxide, Mg(OH)2, has been established, but it has a relatively high dehydration temperature, thus limiting its potential for medium-temperature heat storage applications, which account for a vast proportion of industrial waste heat. To this end, samples of doped Mg(OH)2 with varying proportions (5, 10, 15, and 20 wt%) of potassium nitrate (KNO3) have been developed and characterized for evaluation. The results showed that the Mg(OH)2 sample with 5 wt% KNO3 achieved the best outcome and was able to lower the dehydration temperature of the pure Mg(OH)2 from about 317 °C to 293 °C with an increase in the energy storage capacity from 1246 J/g to 1317 J/g. It also showed a monodisperse surface topology and thermal stability in the non-isothermal test conducted on the sample and therefore appears to have the potential for medium heat storage applications ranging from 293 °C to 400 °C.
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