Nanoconfined Nitrogen‐Doped Carbon‐Coated Hierarchical TiCoN Composites with Enhanced ORR Performance,ChemElectroChem

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Nanoconfined Nitrogen‐Doped Carbon‐Coated Hierarchical TiCoN Composites with Enhanced ORR Performance
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-06-19 , DOI: 10.1002/celc.201800506
Haibo Tang ₁ , Junming Luo ₁ , Jinnan Yu ₁ , Weiyue Zhao ₁ , Huiyu Song ₁ , Shijun Liao ₁

Affiliation

The high cost of platinum‐based cathode catalysts for the oxygen reduction reaction (ORR) has long hampered the practical application of fuel cells. In‐depth studies have shown titanium nitride (TiN) is an interesting non‐precious‐metal electrocatalysts for replacing Pt, due to their low cost, excellent catalytic properties, and stability. In this study, we report on a three‐dimensional (3D) nitrogen‐doped carbon‐coated hierarchical Ti_0.95Co_0.05N composite, created using a one‐step impregnation method followed by nitriding. The catalyst exhibited significantly enhanced ORR activity and excellent electrochemical stability. Our optimal catalyst, 20 %C‐Ti_0.95Co_0.05N, had an ORR performance almost comparable to 20 % Pt/C in an alkaline medium, and a four‐electron pathway was dominant during the ORR reaction. The significantly enhanced ORR performance of this catalyst is attributable to the following factors: the synergic effect of a carbon coating on the nitride nanoparticles (NPs), including the higher surface area and more exposed active‐sites caused by the well‐defined 3D structure resulting from the carbon coating; better mass transfer and electron transfer due to the carbon coating; the contribution of the doped carbon; and enhancement of the nitride's activity by doping with transition metal.

中文翻译：

具有增强的ORR性能的纳米约束氮掺杂碳涂层分层TiCoN复合材料

用于氧还原反应（ORR）的铂基阴极催化剂的高成本长期以来一直困扰着燃料电池的实际应用。深入研究表明，氮化钛（TiN）由于其低成本，出色的催化性能和稳定性，是一种可替代Pt的有趣的非贵金属电催化剂。在本研究中，我们报告了一种采用一步浸渍法然后氮化的方法制备的三维（3D）氮掺杂碳涂层Ti _0.95 Co _0.05 N分层复合材料。该催化剂表现出显着增强的ORR活性和优异的电化学稳定性。我们的最佳催化剂20％C-Ti _0.95 Co _0.05N在碱性介质中的ORR性能几乎可与20％Pt / C相媲美，并且在ORR反应中四电子途径占主导地位。该催化剂的ORR性能显着提高归因于以下因素：碳涂层对氮化物纳米颗粒（NPs）的协同作用，包括较高的表面积和由定义明确的3D结构导致的更多暴露的活性部位从碳涂层; 由于有碳涂层，所以质量转移和电子转移更好；掺杂碳的贡献；通过掺杂过渡金属来增强氮化物的活性。

更新日期：2018-06-19

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