New types of cation storage materials would show tremendous potential in the development of high-performance rechargeable energy storage devices. Herein, we develop layered double hydroxides (LDHs) as promising cation supercapacitor materials in aqueous and neutral operation, via an effective electrochemical activation strategy, for a reversible intercalation of a wide range of metal cations. These activated LDH materials exhibit overwhelming metal-ion storage capacities in aqueous electrolytes as a result of the phase transformation of LDH (repulsive to cations) to hydrogen-vacancy-enriched LDH (LDH-H_V, attractive to cations) induced by the electrochemical activation process. The activated LDH-H_V phase provides a two-dimensional open channel with abundant active sites (H_V) for a reversible intercalation of metal ions, accounting for the significantly enhanced energy storage performance. This vacancy-induced cation intercalation into LDHs builds up a general approach for developing earth-abundant transition-metal resources as a prospective energy storage material toward a large variety of cation supercapacitors.

新型阳离子存储材料将在高性能可充电储能设备的开发中显示出巨大的潜力。在本文中，我们通过有效的电化学活化策略，开发了可在水和中性操作中用作有前景的阳离子超级电容器材料的层状双氢氧化物（LDHs），用于可逆地嵌入各种金属阳离子。这些活化的LDH材料在水电解质中显示出压倒性的金属离子存储能力，这是由于LDH（排斥阳离子）向电化学富集诱导的富氢空位LDH（LDH-H _V，对阳离子有吸引力）的相变的结果。过程。活化的LDH-H _V相提供具有丰富活性位点（H_V）可逆插入金属离子，这说明能量存储性能显着提高。这种由空位引起的阳离子嵌入LDH中的方法为开发地球上丰富的过渡金属资源提供了一种通用方法，该资源可作为朝向多种阳离子超级电容器的潜在储能材料。