Co‐decorated reduced graphene/titanium nitride composite as an active oxygen reduction reaction catalyst with superior stability,International Journal of Energy Research

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Co‐decorated reduced graphene/titanium nitride composite as an active oxygen reduction reaction catalyst with superior stability
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-09-18 , DOI: 10.1002/er.5791
Mujahed Al‐Dhaifallah ₁ , Mohammad Ali Abdelkareem _{2,

3,

4} , Hegazy Rezk _{5,

6} , Hesham Alhumade ₇ , Ahmed M. Nassef _{5,

8,

9} , Abdul Ghani Olabi _{2,

3}

Affiliation

Preparing a cost‐effective, active, stable, non‐precious catalyst, especially at the cathode, is one of the basic requirements for the commercialization of fuel cells (FCs). In this study, cobalt nanoparticles composite with titanium nitride (TiN) were prepared on the surface of reduced graphene oxide, using a facile hydrothermal method, followed by heat treatment under an inert atmosphere. The surface morphology, surface composition, and crystalline structure are investigated with the use of field emission‐scanning electron microscopy, X‐ray photoelectron spectroscopy, and X‐ray diffraction, respectively. The oxygen reduction reaction (ORR) activity is examined in sulfuric acid (0.5 M H₂SO₄), under nitrogen and oxygen bubbling. Results showed that there is an optimum ratio of the Co and the TiN that maximizes the ORR activity. A high onset potential of 0.926 V vs Ag/AgCl is obtained in the case of CoTiN (30)/Gr. This is much higher than that of commercial Pt/C catalyst (0.576 V vs Ag/AgCl). The prepared catalyst has no activity towards methanol oxidation, unlike the Pt/C catalyst. Thus, it considered a promising cathode catalyst for direct alcoholic FCs. Furthermore, the composite catalyst has a high stability, with no activity degradation occurring even after 1000 cycles. This is extremely effective compared to the 20% loss of Pt/C activity under the same operating conditions. The high performance of the prepared catalyst is related to the synergetic effect between the TiN and the Cobalt.

中文翻译：

共修饰的还原石墨烯/氮化钛复合材料，具有优异的稳定性，是一种活性氧还原反应催化剂

燃料电池（FC）商业化的基本要求之一是准备一种具有成本效益，活性，稳定，非贵重的催化剂，尤其是在阴极。在这项研究中，使用简便的水热法在还原的氧化石墨烯表面上制备了含氮化钛（TiN）的钴纳米颗粒复合材料，然后在惰性气氛下进行热处理。使用场发射扫描电子显微镜，X射线光电子能谱和X射线衍射分别研究了表面形态，表面组成和晶体结构。在硫酸（0.5 MH ₂ SO ₄）中检查氧还原反应（ORR）活性），在氮气和氧气下冒泡。结果表明，存在最佳比例的Co和TiN，可最大程度地提高ORR活性。在CoTiN（30）/ Gr的情况下，获得了相对于Ag / AgCl为0.926 V的高启动电位。这远高于市售的Pt / C催化剂（0.576 V对Ag / AgCl）。与Pt / C催化剂不同，制得的催化剂对甲醇氧化没有活性。因此，它被认为是直接醇FCs的有前途的阴极催化剂。此外，该复合催化剂具有高稳定性，即使经过1000次循环也不会发生活性降低。与在相同操作条件下Pt / C活性降低20％相比，这种方法极为有效。制得的催化剂的高性能与TiN和钴之间的协同作用有关。

更新日期：2020-09-18

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