Nitrogen-doped graphene prepared by a transfer doping approach for the oxygen reduction reaction application
Nitrogen-doped graphene prepared by a transfer doping approach for the oxygen reduction reaction application
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DOI：
10.1016/j.jpowsour.2013.07.038
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发表时间：
2014
影响因子：
9.2
通讯作者：
Zaiyong Mo;Ruiping Zheng;Hongliang Peng;Huagen Liang;S. Liao
中科院分区：
文献类型：
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作者：
Zaiyong Mo;Ruiping Zheng;Hongliang Peng;Huagen Liang;S. Liao
采用转移掺杂的方法，将氧化石墨烯（GO）还原后，用汽化的聚苯胺掺杂氮，用热膨胀法制备氧化石墨烯（GO），制备出明确的氮掺杂石墨烯（NG）。元素分析结果表明，掺杂石墨烯中掺杂氮的含量高达6.25 at%，而氧的含量则降至5.17 at%。NG催化剂作为一种非贵金属阴极电催化剂，对氧还原反应表现出优异的活性，对甲醇的耐受性也很好。在0.1 M KOH溶液中，氧还原反应的起始电位、半波电位和极限电流密度分别达到0.98 V （vs. RHE）、0.87 V （vs. RHE）和5.38 mA cm−2，与20 wt% Pt/C的商用催化剂相当。HRTEM和拉曼光谱清楚地揭示了催化剂的石墨烯结构。结果表明，氮掺杂和大表面积的纳米薄片是高ORR催化活性的主要原因。
Well defined nitrogen-doped graphene (NG) is prepared by a transfer doping approach, in which the graphene oxide (GO) is deoxidized and nitrogen doped by the vaporized polyaniline, and the GO is prepared by a thermal expansion method from graphite oxide. The content of doped nitrogen in the doped graphene is high up to 6.25 at% by the results of elements analysis, and oxygen content is lowered to 5.17 at%. As a non-precious metal cathode electrocatalyst, the NG catalyst exhibits excellent activity toward the oxygen reduction reaction, as well as excellent tolerance toward methanol. In 0.1 M KOH solution, its onset potential, half-wave potential and limiting current density for the oxygen reduction reaction reach 0.98 V (vs. RHE), 0.87 V (vs. RHE) and 5.38 mA cm−2, respectively, which are comparable to those of commercial 20 wt% Pt/C catalyst. The well defined graphene structure of the catalyst is revealed clearly by HRTEM and Raman spectra. It is suggested that the nitrogen-doping and large surface area of the NG sheets give the main contribution to the high ORR catalytic activity.