Transformation of worst weed into N-, S-, and P-tridoped carbon nanorings as metal-free electrocatalysts for the oxygen reduction reaction
Transformation of worst weed into N-, S-, and P-tridoped carbon nanorings as metal-free electrocatalysts for the oxygen reduction reaction
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DOI：
10.1039/c5ta04809e
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发表时间：
2015-11
影响因子：
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通讯作者：
Shuyan Gao;Xianjun Wei;Haiying Liu;Keran Geng;Hongqiang Wang;H. Moehwald;D. Shchukin
中科院分区：
文献类型：
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作者：
Shuyan Gao;Xianjun Wei;Haiying Liu;Keran Geng;Hongqiang Wang;H. Moehwald;D. Shchukin
用可持续/具有成本效益的催化剂替代稀缺和昂贵的金属催化剂是目前可持续化学的主要目标之一。在此，我们报告的N-，S-和P-三掺杂的最坏的杂草衍生的碳纳米环（WWCNRs），可以作为一个无金属和选择性的电催化剂的氧还原反应（ORR）的合成。WWCNRs是通过最坏的杂草，无活化聚合，然后通过使用HCl去除金属残留物来合成的。WWCNRs具有较低的起始电位和较高的动力学极限电流密度，对4电子转移反应具有较好的催化活性，同时沿着较高的选择性（引入CO，样品仅损失其原始活性的<7%，相比之下，20重量% Pt/C在4000 s的连续ORR内原始活性损失超过30（94%的初始电流在样品电极上仍然存在，相比之下，在18 000 s后，商业Pt/C电极上的电流保持率为87%）。目前的工作突出了有机丰富的最坏的杂草智能转化为增值功能材料，具有巨大的应用潜力，如燃料电池，锂空气电池，催化剂，和杂催化。
Substituting sustainable/cost-effective catalysts for scarce and costly metal ones is currently among the major targets of sustainable chemistry. Herein, we report the synthesis of N-, S-, and P-tridoped worst-weed-derived carbon nanorings (WWCNRs) that can serve as a metal-free and selective electrocatalyst for the oxygen reduction reaction (ORR). The WWCNRs are synthesized via activation-free polymerization of worst weed, Eclipta prostrata, and then removal of the metallic residues by using HCl. The WWCNRs exhibit good catalytic activity towards the 4 electron-transfer ORR with a low onset potential and high kinetic limiting current density, along with high selectivity (introducing CO, the sample loses only <7% of its original activity, in contrast to more than 30% loss of the original activity for 20 wt% Pt/C over 4000 s of the continuous ORR) and long durability (94% of the initial current still persists at the sample electrode compared with a 87% current retention at commercial Pt/C electrodes after 18 000 s). The present work highlights the smart transformation of organic-rich worst weed into value-added functional materials with great potential for applications such as fuel cells, lithium–air batteries, photocatalysis, and heterocatalysis.