Yang Haoqi, Kou Shuqing, Li Zhiyuan, Chang Zhiyong, Wang Mi, Liu Zhenning, Lu Guolong
Roll Forging Research Institute, College of Material Science and Engineering, Jilin University Changchun Jilin Province 130022 P. R. China
Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University Changchun Jilin Province 130022 P. R. China
RSC Adv. 2019 Dec 4;9(69):40301-40308. doi: 10.1039/c9ra07926b. eCollection 2019 Dec 3.
Development of efficient metal-free electrocatalysts derived from biomass with high activity towards oxygen reduction reaction (ORR) has gained significance attention due to their low manufacturing cost, environmental friendliness and easy large-scale production. Hence, we present a facile method to prepare nitrogen-self-doped carbon aerogels (NSCAs) with a three-dimensional (3D) interconnected porous structure and large surface area. The sample is prepared high-temperature pyrolysis using gelatin as precursor and sodium chloride (NaCl) as sacrificial template. The obtained NSCA-800 catalyst shows excellent ORR performance in O-saturated alkaline electrolyte, which is comparable to a commercial Pt/C catalyst, in terms of its onset potential (0.92 V RHE), half-wave potential (0.77 V RHE), and limited current density (5.31 mA cm). Particularly, the NSCA-800 catalyst exhibits outstanding long-term stability, its ORR kinetic current still retains 95.7% after a continuous 4 h test while that for commercial Pt/C retains just 74.3%. The sustainable biomass gelatin is a promising precursor for the development of carbon materials as effective ORR catalysts.
开发具有高效氧还原反应（ORR）活性的无金属生物质衍生电催化剂，因其制造成本低、环境友好且易于大规模生产而备受关注。因此，我们提出了一种简便的方法来制备具有三维（3D）互连多孔结构和大表面积的氮自掺杂碳气凝胶（NSCA）。该样品以明胶为前驱体、氯化钠（NaCl）为牺牲模板通过高温热解制备而成。所制备的NSCA - 800催化剂在O2饱和碱性电解液中表现出优异的ORR性能，就其起始电位（0.92 V vs. RHE）、半波电位（0.77 V vs. RHE）和极限电流密度（5.31 mA cm−2）而言，可与商业Pt/C催化剂相媲美。特别地，NSCA - 800催化剂表现出出色的长期稳定性，在连续4 h测试后其ORR动力学电流仍保留95.7%，而商业Pt/C仅保留74.3%。可持续的生物质明胶是开发作为有效ORR催化剂的碳材料的有前景的前驱体。
