一个基化物衍生的NiFe2O4作为交换膜水电解的高效和稳定的阳极
Husileng Lee1,2, Guoheng Ding1,2, Linqin Wang1,2
1Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, Hangzhou, 310024, China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|November 22, 2024
概括
研究人员从NiFeOx-350-Ov开发了一种新的,耐用的氧化演化反应 (OER) 电极,用于离子交换膜水电解器 (AEM-WE). 这种无PGM的催化剂表现出高活性和稳定性,这对于高效的水分裂至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 能源转换 能源转换
背景情况:
- 开发具有成本效益,高度活性和耐用的氧化演化反应 (OER) 电极对于离子交换膜水电解器 (AEM-WE) 来说至关重要.
- 目前的AEM-WE技术通常依赖于昂贵的类金属 (PGM) 催化剂,阻碍了广泛采用.
- 在性环境中OER电极的稳定性是一个重大挑战.
研究的目的:
- 报告一种新型,富含空位和稳定的NiFe2O4型电极 (NiFeOx-350-Ov),用于高效和强大的OER催化.
- 为了证明这种无PGM电极在单细胞AEM-WE中的性能.
- 突出一个独特的重建策略,开发先进的开放能源催化剂.
主要方法:
- 从化学蒸汽沉积的前体 (NiFeSexSγ-350) 中合成富含空位的NiFe2O4型电极 (NiFeOx-350-Ov).
- OER性能的电化学表征,包括电流密度和超电位.
- 电极的长期耐用性测试和单细胞AEM-WE与演化反应 (HER) 催化剂 (Ni4Mo/MoO2/NF) 相结合.
主要成果:
- NiFeOx-350-Ov电极在低超电位 (分别为245和270mV) 时实现了100和500mA cm-2的电流密度.
- 观察到特殊的长期耐用性,维持1.0 A cm-2超过1000小时.
- 无PGM的单电池AEM-WE在1.71V的1000mA cm−2 (80°C) 上运行,并且在150小时的电流循环 (60°C) 上显示出稳定性.
结论:
- 开发的富含空位的NiFeOx-350-Ov电极是无PGM的AEM-WE的高度活跃和耐用的阳极材料.
- 独特的重建策略为设计先进的开放能源催化剂提供了一个有前途的途径.
- 这项工作有助于推进高效和成本效益的水电解技术.
相关概念视频
01:17Ion Exchange
553
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
553
03:00Electrolysis
26.0K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.0K
01:09Ion-Exchange Chromatography
369
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
369
01:15Potentiometry: Membrane Electrodes
459
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
459