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首页> 外文期刊>Chemistry: A European journal >Titanium Nitride Nanocrystals on Nitrogen-Doped Graphene as an Efficient Electrocatalyst for Oxygen Reduction Reaction
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Titanium Nitride Nanocrystals on Nitrogen-Doped Graphene as an Efficient Electrocatalyst for Oxygen Reduction Reaction

机译：氮掺杂石墨烯上的氮化钛纳米晶体作为氧还原反应的高效电催化剂

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摘要

The oxygen reduction reaction (ORR) plays a more and more important part in many research and engineering fields, such as energy conversion (including fuel cells and metal-air batteries),~([1]) corrosion prevention,~([2]) and biosensing.~([3]) These applications are rising rapidly and the activity of electrocatalysts for ORR has a pronounced effect on their performances.~([4]) Generally, we expect the ORR process to proceed in an efficient four-electron-transfer pathway with the formation of H20 as the end product.~([5]) However, the two-electron-transfer process often coexists with and this significantly decreases the catalytic efficiency. Noble metal-based electrocatalysts (mainly Pt and its alloys) have been regarded as best catalysts for ORR in fuel cells;~([4,6-8]) however, the ORR kinetics on Pt-based electrodes is sluggish and they still suffer from multiple problems, for instance, the crossover effects, CO poisoning, and poor stability after long-term operation.~([9]) Furthermore, the high usage cost of Pt due to its limited natural reserves has greatly hindered the large-scale commercialization of fuel cells.~([10]) Therefore, finding efficient and low-cost non-noble metal electrocatalysts for ORR is essential.
机译：氧还原反应（ORR）在许多研究和工程领域中起着越来越重要的作用，例如能量转换（包括燃料电池和金属空气电池），〜（[1]）腐蚀预防，〜（[2] ）和生物传感。〜（[3]）这些应用正在迅速增长，并且电催化剂对ORR的活性对其性能有显着影响。〜（[4]）通常，我们期望ORR过程在高效的四级条件下进行。最终形成H 2 O的电子转移途径。[（5）]然而，两电子转移过程经常并存，这大大降低了催化效率。贵金属基电催化剂（主要是Pt及其合金）被认为是燃料电池中ORR的最佳催化剂;〜（[4,6-8]），Pt基电极上的ORR动力学反应缓慢，并且仍然会受到影响由于存在多种问题，例如交叉效应，CO中毒以及长期运行后的稳定性差。〜（[9]）此外，由于其天然储量有限，Pt的高使用成本极大地阻碍了Pt的大规模生产。燃料电池的商业化。（[10]）因此，找到有效且低成本的ORR非贵金属电催化剂至关重要。

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