Hydrogen Oxidation and Evolution Reaction Kinetics on Carbon Supported Pt, Ir, Rh, and Pd Electrocatalysts in Acidic Media
Hydrogen Oxidation and Evolution Reaction Kinetics on Carbon Supported Pt, Ir, Rh, and Pd Electrocatalysts in Acidic Media
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DOI：
10.1149/2.0981501jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Gasteiger, Hubert A.
中科院分区：
文献类型：
--
作者：
Durst, Julien;Simon, Christoph;Gasteiger, Hubert A.
在质子交换膜燃料电池（PEMFC）装置中，采用H2泵方法研究了碳载金属（Pt，Ir，Rh，Pd）纳米粒子电催化剂的氢氧化析氢反应（HOR/HER）行为。在描述了将净法拉第电流归一化为电极活性表面积的最佳方法后，我们在313 K至353 K的温度范围内测量了HOR/HER动力学参数（交换电流密度和传递系数），并计算了HOR/HER过程的活化能。我们比较了测得的动力学参数与文献中从不同的传质限制自由设置中提取的动力学参数，以评估这些最活跃的表面上的氢电催化。HOR/HER活性与以下成比例：Pt > Ir > Rh > Pd。所有金属的阳极和阴极传递系数相似（约为1.00）。0.5），导致塔菲尔斜坡约。140 mV/decade（353 K）（Pd的阳极分支和Rh的阴极分支除外）。Pt和Ir的活化能最低（约为20 kJ/mol）。对于Rh和Pd，发现较高的活化能（约30 kJ/mol），并归因于表面氧化物和氢化物相的形成，分别。(C)作者（S）2014由ECS发布。这是一篇开放获取的文章，根据知识共享署名4.0许可证（CC BY，http：//creativecommons.org/licenses/by/4.0/）的条款分发，该许可证允许在任何媒体上不受限制地重复使用作品，前提是正确引用原始作品。All rights reserved.
The hydrogen oxidation and evolution reaction (HOR/HER) behavior of carbon supported metal (Pt, Ir, Rh, Pd) nanoparticle electrocatalysts is studied using the H-2 pump approach, in a proton exchange membrane fuel cell (PEMFC) setup. After describing the best method for normalizing the net faradaic currents to the active surface area of the electrodes, we measure the HOR/HER kinetic parameters (exchange current densities and transfer coefficients) in a temperature range from 313 K to 353 K and calculate the activation energy for the HOR/HER process. We compare the measured kinetic parameters with those extracted from different mass-transport limitation free setups in literature, to evaluate the hydrogen electrocatalysis on these most active surfaces. The HOR/HER activity scales with the following: Pt > Ir >> Rh > Pd. The anodic and cathodic transfer coefficients are similar for all metals (ca. 0.5), leading to Tafel slopes of ca. 140 mV/decade at 353 K (except for the anodic branch of Pd and the cathodic branch of Rh). The lowest activation energies are found for Pt and Ir (approximate to 20 kJ/mol). For Rh and Pd, higher activation energies are found (approximate to 30 kJ/mol), and attributed to the formation of surface oxides and hydride phase, respectively. (C) The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. All rights reserved.