使用CO2作为活性材料的水性氧化还原流电池,具有同质的IR催化剂
Ryoichi Kanega1, Erika Ishida1, Takaaki Sakai2
1Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan.
Angewandte Chemie (International ed. in English)
|August 31, 2023
概括
这项研究介绍了一种新型的水性氧化还原流电池,使用催化剂通过二氧化碳 (CO2) 直接储存电力,并形成氧化还原对,绕过能源密集的转换.
科学领域:
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
- 催化剂是一种催化剂.
背景情况:
- 传统的以为基础的储能系统涉及二氧化碳 (CO2) 转化,因此遭受了显著的能量损失 (在H2生成过程中约70%;在电力回收过程中约40%).
- 开发直接利用二氧化碳在储能中的有效方法对于提高整体系统效率至关重要.
研究的目的:
- 设计和评估一种水性氧化还原流电池系统,该系统直接利用二氧化碳形式的氧化还原对来进行电力存储和发电.
- 克服与基于的储能途径相关的固有低效率.
主要方法:
- 开发一种采用同质 (Ir) 催化剂的水性氧化还原流电池.
- 使用CO2-形式的氧化还原对作为活性电化学物种.
- 在现场光X射线吸收细结构 (XAFS) 光谱,用于实时分析催化物种.
主要成果:
- 开发的系统实现了10.5 mAh (1.5 Ah L-1) 的最大放电容量.
- 经过50个循环,表现出极好的循环稳定性,低容量衰变率为每周期0.2%,超过50个循环.
- 实现了2550的总营业额,表明了强大的催化性能.
- 在现场,XAFS证实活体物种在运行过程中存在高价值状态 (IrIV).
结论:
- 二氧化碳形式的氧化还原流电池为直接储存电力提供了一个有前途的替代方案,减轻了与中间体相关的能源损失.
- 同质的催化剂在这种水性氧化还原流系统中表现出高活性和稳定性.
- 确定IrIV物种是关键活性成分,为进一步催化剂优化提供了洞察力.
相关概念视频
02:47Voltaic/Galvanic Cells
57.5K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.5K
03:12Batteries and Fuel Cells
27.6K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.6K
01:23Redox Equilibria: Overview
586
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
586
02:58Balancing Redox Equations
52.5K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
52.5K
03:00Electrolysis
26.6K
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...
26.6K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.4K