Zhang Yaqiong, Guo Chaozhong, Ma Zili, Wu Huijuan, Chen Changguo
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China.
Materials (Basel). 2015 Sep 25;8(10):6658-6667. doi: 10.3390/ma8105331.
The development of inexpensive and active Pt-free catalysts as an alternative to Pt-based catalysts for oxygen reduction reaction (ORR) is an essential prerequisite for fuel cell commercialization. In this paper, we report a strategy for the design of a new Fe-N/C electrocatalyst derived from the co-pyrolysis of biomass, carbon black (Vulcan XC-72R) and FeCl₃·6H₂O at 900 °C under nitrogen atmosphere. Electrochemical results show that the Fe-N/C catalyst exhibits higher electrocatalytic activity for ORR, longer durability and higher tolerance to methanol compared to a commercial Pt/C catalyst (40 wt %) in an alkaline medium. In particular, Fe-N/C presents an onset potential of 0.05 V (. Hg/HgO) for ORR in an alkaline medium, with an electron transfer number () of ~3.90, which is close to that of Pt/C. Our results confirm that the catalyst derived from and carbon black is a promising non-noble metal catalyst as an alternative to commercial Pt/C catalysts.
开发廉价且活性高的无铂催化剂作为基于铂的氧还原反应（ORR）催化剂的替代品，是燃料电池商业化的必要前提。在本文中，我们报告了一种设计新型Fe-N/C电催化剂的策略，该催化剂由生物质、炭黑（Vulcan XC-72R）和FeCl₃·6H₂O在氮气气氛下于900℃共热解得到。电化学结果表明，在碱性介质中，与商业Pt/C催化剂（40 wt%）相比，Fe-N/C催化剂对ORR表现出更高的电催化活性、更长的耐久性和更高的甲醇耐受性。特别是，Fe-N/C在碱性介质中ORR的起始电位为0.05 V（vs. Hg/HgO），电子转移数（n）约为3.90，与Pt/C接近。我们的结果证实，由生物质和炭黑衍生的催化剂是一种有前景的非贵金属催化剂，可替代商业Pt/C催化剂。
