Porous Carbon Nanosheets Codoped with Nitrogen and Sulfur for Oxygen Reduction Reaction in Microbial Fuel Cells.
Porous Carbon Nanosheets Codoped with Nitrogen and Sulfur for Oxygen Reduction Reaction in Microbial Fuel Cells.
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DOI：
10.1021/acsami.5b05144
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发表时间：
2015-08
影响因子：
9.5
通讯作者：
Heyang Yuan;Yang Hou;Z. Wen;Xiaoru Guo;Junhong Chen;Zhen He
中科院分区：
文献类型：
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作者：
Heyang Yuan;Yang Hou;Z. Wen;Xiaoru Guo;Junhong Chen;Zhen He
在这项工作中，一个简单的合成策略已被开发用于制备氮和硫共掺杂的多孔碳纳米片（N/S-CNS）作为微生物燃料电池（MFC）的阴极催化剂。所制备的N/S-CNS显示出有利于电化学能量转换的特征，例如高表面积（1004 m2 g-1）、缺陷结构和主要由多孔纳米片形态产生的活性位点的丰富暴露。得益于独特的纳米结构，所得纳米片对氧还原反应（ORR）表现出有效的电催化活性。在中性磷酸盐缓冲液中，N/S-CNS在线性扫描伏安法中的起始电位相对于Ag/AgCl约为-0.05 V。电化学交流阻抗测试表明，共掺杂催化剂的欧姆电阻和电荷转移电阻分别为1.5和14.8 Ω，均低于Pt/C催化剂的电阻。此外，计算的N/S-CNS的电子转移数为1.35，表明在催化剂上的ORR主要通过有利的四电子途径进行。使用N/S-CNS作为阴极催化剂的MFC产生的电流密度（6.6A m（-2））与使用Pt/C的MFC（7.3A m（-2））相当。高耐久性和低价格表明N/S-CNS可以成为MFC应用的有竞争力的催化剂。
In this work, a simple synthesis strategy has been developed for the preparation of nitrogen- and sulfur-codoped porous carbon nanosheets (N/S-CNS) as a cathode catalyst for microbial fuel cells (MFCs). The as-prepared N/S-CNS showed favorable features for electrochemical energy conversion such as high surface area (1004 m(2) g(-1)), defect structure, and abundant exposure of active sites that arose primarily from porous nanosheet morphology. Benefiting from the unique nanostructure, the resulting nanosheets exhibited effective electrocatalytic activity toward oxygen reduction reaction (ORR). The onset potential of the N/S-CNS in linear-sweep voltammetry was approximately -0.05 V vs Ag/AgCl in neutral phosphate buffer saline. Electrochemical impedance spectroscopy showed that the ohmic and charge-transfer resistance of the codoped catalyst were 1.5 and 14.8 Ω, respectively, both of which were lower than that of platinum/carbon (Pt/C). Furthermore, the electron-transfer number of the N/S-CNS was calculated to be ∼3.5, suggesting that ORR on the catalyst proceeds predominantly through the favorable four-electron pathway. The MFC with N/S-CNS as a cathode catalyst generated current density (6.6 A m(-2)) comparable to that with Pt/C (7.3 A m(-2)). The high durability and low price indicate that N/S-CNS can be a competitive catalyst for applications of MFCs.