Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media,ACS Catalysis

当前位置： X-MOL 学术 › ACS Catal. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-05-28 , DOI: 10.1021/acscatal.0c00101
Alexandr G. Oshchepkov ₁ , Guillaume Braesch _{2,

3} , Antoine Bonnefont ₄ , Elena R. Savinova ₂ , Marian Chatenet ₃

Affiliation

Nickel is a very abundant transition metal in the Earth’s crust, and it finds numerous applications in electrochemical processes where metallic Ni or its oxides are thermodynamically stable, particularly in alkaline environments. This contribution addresses electrocatalytic properties of Ni-based catalysts in reactions of fuel oxidation in alkaline media. It first details the electrochemical behavior of Ni in alkaline media and approaches to determine the active surface area of Ni electrodes. Second, the electrocatalytic activities of Ni-based electrocatalysts for the alkaline hydrogen oxidation reaction are described (an endeavor for the development of anion exchange membrane fuel cells), along with a detailed analysis of the strategies put forward to improve them. It is notably shown that the state of Ni surface (oxidized or reduced) largely determines its electrocatalytic activity. This state of the surface also conveys a pivotal importance regarding the activity of Ni for the oxidation of complex fuels (borohydride, boranes, and hydrazine). Finally, emphasis is made on the durability of Ni-based catalysts in alkaline environments. It is shown that, in such media, the material durability of Ni-based electrodes can be high, but this does not necessarily warrant stable electrocatalytic activity, because of possible deactivation following surface oxide or bulk hydride formation in operation.

中文翻译：

镍基碱性介质中含氢燃料氧化催化剂的最新研究进展

镍是地壳中非常丰富的过渡金属，它在电化学过程中有许多应用，其中金属Ni或其氧化物是热力学稳定的，特别是在碱性环境中。这一贡献解决了镍基催化剂在碱性介质中燃料氧化反应中的电催化性能。它首先详细介绍了镍在碱性介质中的电化学行为，并确定了镍电极的有效表面积。其次，描述了镍基电催化剂对碱性氢氧化反应的电催化活性（为开发阴离子交换膜燃料电池所做的努力），并详细分析了为改善它们而提出的策略。值得注意的是，Ni表面的状态（被氧化或被还原）很大程度上决定了其电催化活性。表面的这种状态还传达了关于Ni对复杂燃料（硼氢化物，硼烷和肼）氧化的活性的重要意义。最后，重点是镍基催化剂在碱性环境下的耐久性。已经表明，在这种介质中，Ni基电极的材料耐久性可以很高，但是由于操作中表面氧化物或本体氢化物形成后可能失活，因此不一定保证稳定的电催化活性。重点放在镍基催化剂在碱性环境下的耐久性。已经表明，在这种介质中，Ni基电极的材料耐久性可以很高，但是由于操作中表面氧化物或本体氢化物形成后可能失活，因此不一定保证稳定的电催化活性。重点放在镍基催化剂在碱性环境下的耐久性。已经表明，在这种介质中，Ni基电极的材料耐久性可以很高，但是由于操作中表面氧化物或本体氢化物形成后可能失活，因此不一定保证稳定的电催化活性。

更新日期：2020-07-02

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11