Zhong Li, Wang Xian, Guo Yuanyuan, Ding Junyang, Huang Qi, Li Ting-Ting, Hu Yue, Qian Jinjie, Huang Shaoming
Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325000, China.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
ACS Appl Mater Interfaces. 2021 Nov 24;13(46):55454-55462. doi: 10.1021/acsami.1c17229. Epub 2021 Nov 12.
Oxygen evolution reaction (OER) on the anode has become one of the most widely studied electrochemical processes, which poses an important role in several energy generation technologies. In this work, we have designed and synthesized a series of metal-organic framework (MOF)-derived oxides pyrolyzed at different temperatures for efficient water oxidation in alkaline solutions. First, the barrel-shaped microcrystals can be conveniently synthesized under solvothermal conditions, and the hollow morphology of with low crystallinity can be obtained through the fierce hydrolysis of Fe(III) ions. After being oxidized in air, there are only two typical phases of oxides including and . During electrolysis, turns out to be immediately degraded into active Ni/FeOOH nanosheets with improved OER performance, while there is almost no structural and morphological change in due to the structural rigidity and robust stability. Furthermore, the optimal exhibits a promising electrocatalytic OER performance with a low Tafel slope of 137.4 mV dec, a small overpotential of 260 mV at 10 mA cm, and a high current retention of 93.8% after the stability test. The present work would motivate the scientific community to construct various MOF-derived nanomaterials for efficient energy storage and conversion applications.
阳极上的析氧反应（OER）已成为研究最为广泛的电化学过程之一，它在多种能源生成技术中发挥着重要作用。在这项工作中，我们设计并合成了一系列在不同温度下热解的金属有机框架（MOF）衍生氧化物，用于在碱性溶液中高效水氧化。首先，在溶剂热条件下可以方便地合成桶状微晶，通过Fe(III)离子的剧烈水解可获得低结晶度的中空形态。在空气中氧化后，仅存在两种典型的氧化物相，包括 和 。在电解过程中， 被证明会立即降解为具有改善的OER性能的活性Ni/FeOOH纳米片，而 由于结构刚性和强大的稳定性，几乎没有结构和形态变化。此外，最佳的 表现出有前景的电催化OER性能，低塔菲尔斜率为137.4 mV dec，在10 mA cm时过电位小至260 mV，稳定性测试后电流保留率高达93.8%。目前的工作将促使科学界构建各种MOF衍生的纳米材料，用于高效的能量存储和转换应用。
