当前位置: X-MOL 学术Carbon › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Hemoglobin-derived Fe-Nx-S species supported by bamboo-shaped carbon nanotubes as efficient electrocatalysts for the oxygen evolution reaction
Carbon ( IF 10.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.carbon.2020.06.064
Weiming Chen , Xuanli Luo , Sanliang Ling , Yongfang Zhou , Bihan Shen , Thomas J.A. Slater , Jesum Alves Fernandes , Tingting Lin , Jianshe Wang , Yi Shen

Abstract Herein, we report a facile route to synthesize isolated single iron atoms on nitrogen-sulfur-codoped carbon matrix via a direct pyrolysis process in which hemoglobin, a by-product of the meat industry, was utilized as a precursor for iron, nitrogen and sulfur while bamboo-shaped carbon nanotubes served as a support owing to their excellent conductivity and numerous defects. The resulting metal-nitrogen complexed carbon showed outstanding catalytic performance for the oxygen evolution reaction (OER) in alkaline solutions. At an overpotential of 380 mV, the optimal sample yielded a current density of 83.6 mA cm−2, which is 2.5 times that of benchmark IrO2 (32.8 mA cm−2), rendering it as one of the best OER catalysts reported so far. It also showed negligible activity decay in alkaline solutions during long-term durability tests. Control experiments and X-ray absorption fine structure analyses revealed that Fe-Nx species in the samples are the active sites for OER. Further density functional theory calculations indicated that the presence of sulfur in the carbon matrix modified the electronic structures of active species, thereby leading to the superior activity of the sample.

中文翻译:

竹状碳纳米管支持的血红蛋白衍生的 Fe-Nx-S 物种作为析氧反应的有效电催化剂

摘要在此,我们报告了一种通过直接热解过程在氮硫共掺杂的碳基质上合成孤立的单铁原子的简便途径,在该过程中,肉类工业的副产品血红蛋白被用作铁、氮和硫,而竹状碳纳米管由于其优异的导电性和众多缺陷而作为载体。所得金属-氮络合碳在碱性溶液中对析氧反应(OER)显示出优异的催化性能。在 380 mV 的过电位下,最佳样品产生了 83.6 mA cm-2 的电流密度,是基准 IrO2 (32.8 mA cm-2) 的 2.5 倍,使其成为迄今为止报道的最佳 OER 催化剂之一。在长期耐久性测试中,它还显示出在碱性溶液中的活性衰减可以忽略不计。对照实验和 X 射线吸收精细结构分析表明,样品中的 Fe-Nx 物种是 OER 的活性位点。进一步的密度泛函理论计算表明,碳基质中硫的存在改变了活性物质的电子结构,从而导致样品具有优异的活性。
更新日期:2020-10-01
down
wechat
bug