Reversible potassium-ion intercalation in anti-NASICON-type iron molybdate Fe₂(MoO₄)₃ is demonstrated for the first time. Submicron-sized Fe₂(MoO₄)₃ particles are synthesized by solution combustion synthesis route using glycine as fuel. The monoclinic anti-NASICON type Fe₂(MoO₄)₃ positive electrode exhibits an initial discharge capacity of ∼94 mAh g^-1 involving an Fe³⁺/Fe²⁺ redox activity centered around 2.6 V (vs. K/K⁺). Employing ex situ X-ray diffraction, the K⁺ (de)intercalation is found to involve an underlying solid-solution redox mechanism. This anti-NASICON Fe₂(MoO₄)₃ molybdate is found to be an efficient polyanionic cathode candidate for potassium-ion batteries.

首次证明了抗NASICON型钼酸铁Fe ₂（MoO ₄）_3中可逆的钾离子嵌入。以甘氨酸为燃料，通过固溶燃烧合成路线合成了亚微米级的Fe ₂（MoO ₄）₃颗粒。单斜晶抗NASICON型Fe ₂（MoO ₄）₃正极具有约94 mAh g ^-1的初始放电容量，涉及以2.6 V（vs. K / K ⁺）为中心的Fe ³⁺ / Fe ²⁺氧化还原活性。。利用异位X射线衍射，K ⁺发现（脱）插层涉及潜在的固溶氧化还原机理。发现该抗NASICON Fe ₂（MoO ₄）₃钼酸盐是钾离子电池的有效聚阴离子阴极候选物。