Preparation and characterization of AgO ordered array electrode materials

doi:10.11949/j.issn.0438-1157.20180190

Abstract

Abstract:

AgO ordered array materials were synthesized by electrochemical oxidization of Ag naoparticles in sodium hydroxide solution. As the characterizations of properties revealed, the prepared AgO material has unique straight-through hollow structure, bringing a positive effect on the dispersion of electrolyte inside materials, which would result in better electrochemical properties of corresponding batteries. Thus prepared AgO material could be used as an electrode directly without any binders. The electrode offered a discharge capacity of 422.6 mA·h·g^-1 at 3 C rate and utilization ratio of electrode material could reach 97.8% as a cathode of Al/AgO battery (stopping potential is 0.5 V and reference electrode is Ag/Ag⁺ electrode). There was still a capacity of 387.8 mA·h·g^-1 at 7 C rate with utilization ratio 89.7%. Meanwhile, the cycling performance was also improved and a specific capacity of 405.2 mA·h·g^-1 could still be offered at the 10th cycle. The work provides a facile and eco-friendly method and the prepared AgO materials would have unique advantages in practical applications.

Key words: electrochemical, AgO, preparation, mesoscale, particulate processes, ordered array, high specific energy capacity, cycling performance

摘要：

在浓氢氧化钠溶液中，通过电化学方法氧化银纳米颗粒制备得到AgO有序阵列结构电极材料。性能表征表明，所制备的AgO材料具有独特的直通孔阵列结构，有利于电解质溶液在孔隙中的扩散，可直接用作Al/AgO电池阴极，无需黏结剂等。与常规AgO阴极材料相比，同等条件下，以AgO有序阵列结构材料为阴极所组成电池的放电性能大幅提高，3 C倍率下质量比容量可达422.6 mA·h·g^-1，电极活性材料的利用率为97.8%，7 C倍率下质量比容量依然有387.8 mA·h·g^-1，活性物质利用率89.7%。同时，循环性能相比传统电极也得到大幅提升，在第10个循环时依然保持着405.2 mA·h·g^-1的质量比容量。制备方法易于操作且高效环保，有利于工业化生产；所得材料具有独特结构和性能优势。

关键词: 电化学, AgO, 制备, 介尺度, 颗粒过程, 有序阵列, 高比容量, 循环性能

CLC Number:

TQ152

TIAN Hua, ZHANG Zhiying, LIU Chunyan. Preparation and characterization of AgO ordered array electrode materials[J]. CIESC Journal, 2018, 69(8): 3711-3716.

田华, 张志颖, 刘春艳. AgO有序阵列结构电极材料的制备与表征[J]. 化工学报, 2018, 69(8): 3711-3716.

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