4.7 Article

TiO2-Decorated Titanium Carbide MXene co-Doped with Nitrogen and Sulfur for Oxygen Electroreduction

期刊

ACS APPLIED NANO MATERIALS
卷 4, 期 2, 页码 1094-1103

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02695

关键词

2D materials; MXene; quantum dots; ORR; electrocatalyst; fuel cells

资金

  1. Department of Science and Technology - Science and Engineering Research Board (DST-SERB) [EMR/2016/005888]
  2. DST-FIST (fund for the development of S&T infrastructure), India [SR/FST/CST-266/2015(c)]

向作者/读者索取更多资源

The study presents the development of an efficient electrocatalyst for the electroreduction of oxygen in low-temperature fuel cells by self-decoration of TiO2 on the surface and in between layers of nitrogen (-N), sulfur (-S) co-doped MXene (Ti3C2) to form Ti3C2/NSCD-600 nanocomposite. The optimized nanocomposite exhibits improved catalytic performance, faster kinetics, and better cycling stability compared to state-of-the-art catalyst (Pt/C), demonstrating potential for energy generation in low-temperature FCs.
Challenging electroreduction of oxygen at the cathodic section of low-temperature fuel cells (FCs) furnishes several issues for their rigorous commercialization. Because of the several concerns over employing a more reliable electrocatalyst, Pt/C, such as stability (of both Pt and carbon support), scarcity, and cost, the technology remains under development for its commercial applications. Thus, to develop an efficient electrocatalyst for the electroreduction of oxygen, we report a systematic self-decoration of TiO2 on the surface and in between layers of nitrogen (-N), sulfur (-S) co-doped MXene (Ti3C2) using a hydrothermal method followed by an annealing process. The crystallographic analysis and morphological studies of such an assembly of TiO2 on N, S-doped Ti3C2 (Ti3C2/NSCD-T) is confirmed by spectroscopic and microscopic characterization techniques. Interestingly, the optimized nanocomposite (Ti3C2/NSCD-600) shows improvement in the electroreduction of oxygen with exciting E-onset = 0.98 V against reversible hydrogen electrode (RHE) and better limiting current density (J(L)) = 3.5 mA/cm(2) in the alkaline electrolyte (0.1 M KOH) solution. Moreover, rotating ring disk electrode (RRDE) measurements were performed to understand the mechanism of electroreduction of oxygen as well as to detect the peroxide (HO2-) yield. Further, the Ti3C2/NSCD-600 catalyst demonstrates faster kinetics, which is confirmed through the Tafel slope (72 mV/dec). Most importantly, Ti3C2/NSCD-600 reveals better cycling stability up to 10,000 (10k) electrochemical cycles in 0.1 M KOH against the state-of-the-art catalyst (Pt/C). Thus, the present work demonstrates the development in the electrocatalyst toward energy generation in low-temperature FCs.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据