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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...
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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...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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电解质pH如何影响氧减少反应

Jay T Bender1, Rohan Yuri Sanspeur2, Nicolas Bueno Ponce3

  • 1McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States.

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概括

电解质的pH显著影响氧降解反应 (ORR) 速率,特别是对黄金和白银等弱结合催化剂. 这是由于电场改变了中间的结合能,影响了催化活性.

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科学领域:

  • 电化学
  • 材料科学
  • 催化剂

背景情况:

  • 电解质pH是影响氧降解反应 (ORR) 动力学和选择性的关键因素.
  • 在不同催化剂中,pH影响ORR率的确切机制尚不清楚.
  • 了解这些依赖pH的效应对于设计高效的电催化剂至关重要.

研究的目的:

  • 阐明不同金属催化剂ORR率pH敏感度的根本原因.
  • 调查催化剂-电解质界面上的电场在调解pH效应中的作用.
  • 将中间结合能量的变化与观察到的ORR速率变化相关联.

主要方法:

  • 在各种金属电极 (Pt,Ir,Ru,Pd,Au,Ag) 上进行ORR的实验动力学研究.
  • 原子模拟用于模拟电场效应和中间结合能.
  • 分析ORR机制中的质子合电子转移 (PCET) 和非PCET步骤.

主要成果:

  • 强结合金属 (Pt,Ir,Ru,Pd) 的ORR率表现出很弱的pH依赖性,因为中间结合能量受到电场的影响很小.
  • 在性电解质中,由于被负电场稳定吸附的O2,弱结合金属 (Au,Ag) 的ORR率显著增加.
  • ORR的速率决定步骤不受pH影响,但O2吸附的激活屏障在弱结合催化剂下降.

结论:

  • 对ORR的pH影响主要是由电场诱导的中间结合能量的变化驱动的.
  • 强结合的催化剂具有较低的pH敏感度,而弱结合的催化剂具有较高的pH敏感度.
  • 调整电解质的pH值可以通过修改吸附屏障来调整ORR动力学,特别是对结合较弱的材料.