Effect of carbon nanofiber surface functional groups on oxygen reduction in alkaline solution
Effect of carbon nanofiber surface functional groups on oxygen reduction in alkaline solution
复制标题
碳纳米纤维表面官能团对碱性溶液中氧还原的影响
DOI：
10.1016/j.jpowsour.2012.10.043
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发表时间：
2013-03
影响因子：
9.2
通讯作者：
Xin-sheng Zhang
中科院分区：
文献类型：
--
作者：
Xin-sheng Zhang
合成了表面含羧基（CNF-OX）、羰基（CNF-CO）、羟基（CNF-OH）和含氮基团（CNF-ON）的碳纳米纤维（CNFs），研究了其在碱性溶液中对氧还原反应（ORR）的电催化活性。X射线光电子能谱（XPS）表征结果表明，CNF-OX、CNF-CO和CNF-OH分别引入了较高浓度的羧基、羰基和羟基。循环伏安法表明，含氧和含氮基团都可以提高CNFs对ORR的电催化活性。具有含氮基团的CNF-ON/GC电极表现出最高的ORR电流密度。旋转圆盘电极（RDE）表征结果表明，CNF-ON/GC电极上的氧还原几乎完全通过四电子还原途径进行，CNF-OX/GC、CNF-CO/GC和CNF-OH/GC电极在低电位下进行双电子还原途径（-0.2 V至-0.6 V），然后在更负的电位下逐渐进行四电子还原，而未处理的碳纳米管（CNF-P/GC）电极在所研究的整个电位范围内主要以双电子还原途径进行。
Carbon nanofibers (CNFs) with different content of surface functional groups which are carboxyl groups (CNF–OX), carbonyl groups (CNF–CO) and hydroxyl groups (CNF–OH) and nitrogen-containing groups (CNF–ON) are synthesized, and their electrocatalytic activities toward oxygen reduction reaction (ORR) in alkaline solution are investigated. The result of X-ray photoelectron spectroscopy (XPS) characterization indicates that a higher concentration of carboxyl groups, carbonyl groups and hydroxyl groups are imported onto the CNF–OX, CNF–CO and CNF–OH, respectively. Cyclic voltammetry shows that both the oxygen- and nitrogen-containing groups can improve the electrocatalytic activity of CNFs for ORR. The CNF–ON/GC electrode, which has nitrogen-containing groups, exhibits the highest current density of ORR. Rotating disk electrode (RDE) characterization shows that the oxygen reduction on CNF–ON/GC electrode proceeds almost entirely through the four-electron reduction pathway, the CNF–OX/GC, CNF–CO/GC and CNF–OH/GC electrodes proceed a two-electron reduction pathway at low potentials (−0.2 V to −0.6 V) followed by a gradual four-electron reduction pathway at more negative potentials, while the untreated carbon nanofiber (CNF–P/GC) electrode proceeds predominantly by a two-electron reduction pathway within the whole range of potential studied.
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影响因子：
4.9
作者：
Banks, CE;Davies, TJ;Compton, RG
通讯作者：
Compton, RG
影响因子：
2.5
作者：
Kruusenberg, Ivar;Leis, Jaan;Tammeveski, Kaido
通讯作者：
Tammeveski, Kaido
影响因子：
9.2
作者：
Haibing Zheng;Yongliang Li;Shuixia Chen;P. Shen
通讯作者：
Haibing Zheng;Yongliang Li;Shuixia Chen;P. Shen
影响因子：
6.6
作者：
Gea Jürmann;D. Schiffrin;K. Tammeveski
通讯作者：
Gea Jürmann;D. Schiffrin;K. Tammeveski
影响因子：
2.4
作者：
B. Šljukić;C. Banks;R. Compton
通讯作者：
B. Šljukić;C. Banks;R. Compton