Transition metal pyrophosphates (TMPs) is a novel family of materials that gaining significant interest as a promising electrode for supercapacitors (SCs) owing to its significant redox-active functionality, excellent chemical and thermal stability, superior electrical conductivity, cheap cost and layered structure. Recently, various attempts have been undertaken to design and engineer TMPs (MPO where M = Ni, Co, Cu, Mn, Zn, Ti and Fe) for high-performance SCs. This review highlights the key progress with an emphasis on the design strategies, structural features and their potential applications in SCs. The electrochemical characteristics of TMPs can be effectively tailored by diverse inventive ways likedoping, creating nanostructures and core–shell heterostructures. The potential of TMPs as a positive electrode in the hybrid SCs highlighted to comprehend the operational importance of these materials. Lastly, the challenges and prospects are discussed for the advancement of high TMPs for SCs. The comprehensive understanding of the structure–property-performance correlation gives a directions for the development of TMPs based next-generation energy storage devices.

中文翻译：

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过渡金属焦磷酸盐 (MxP2O7)：混合超级电容器的新产品


过渡金属焦磷酸盐（TMP）是一类新型材料，由于其显着的氧化还原活性功能、优异的化学和热稳定性、优异的导电性、廉价的成本和层状结构，作为超级电容器（SC）的有前途的电极而引起了人们的广泛兴趣。最近，人们进行了各种尝试来设计和制造高性能 SC 的 TMP（MPO，其中 M = Ni、Co、Cu、Mn、Zn、Ti 和 Fe）。本综述强调了关键进展，重点关注设计策略、结构特征及其在 SC 中的潜在应用。 TMP 的电化学特性可以通过多种创造性方法有效地定制，例如掺杂、创建纳米结构和核壳异质结构。强调 TMP 作为混合 SC 正极的潜力，以理解这些材料的操作重要性。最后，讨论了 SC 高 TMP 的挑战和前景。对结构-性能-性能相关性的全面理解为基于TMP的下一代储能装置的开发提供了方向。