Porous coral reefs-like MoS2/nitrogen-doped bio-carbon as an excellent Pt support/co-catalyst with promising catalytic activity and CO-tolerance for methanol oxidation reaction
Porous coral reefs-like MoS2/nitrogen-doped bio-carbon as an excellent Pt support/co-catalyst with promising catalytic activity and CO-tolerance for methanol oxidation reaction
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多孔珊瑚礁状MoS2/氮掺杂生物碳作为优异的Pt载体/助催化剂，对甲醇氧化反应具有良好的催化活性和CO耐受性
DOI：
10.1016/j.electacta.2017.06.052
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发表时间：
2017-08
影响因子：
6.6
通讯作者：
Zou Jinlong
中科院分区：
文献类型：
--
作者：
Tang Bo;Lin Yuhui;Xing Zipeng;Duan Yaqiang;Pan Siyu;Dai Ying;Yu Jia;Zou Jinlong
直接甲醇燃料电池中铂基催化剂的电催化活性差、耐CO能力差、铂负载量高等问题仍有待解决。本研究以甘蔗渣为碳源，成功制备了多孔MoS 2/氮掺杂碳（MoS 2/CNX）催化剂，用于甲醇氧化反应（莫尔）。进行各种材料表征技术和电化学测试以研究结构特征和莫尔活性之间的关系。CNX的多孔结构为生长具有珊瑚礁结构的MoS 2提供了丰富的结合位点，有利于MoS 2边缘的暴露，从而提高MoS 2/CNX的共催化活性。Pt/MoS 2/CNX显示出比Pt/MoS 2/C（710.1 mA mgpt-1）和商业Pt/C（405.4 mA mgpt-1）更高的质量活性（1030.2 mA mgpt-1），这是因为MoS 2/CNX可以提供丰富的附着位点来锚定Pt，以扩大锚Pt的可用电化学活性面积（111.2 m2 g-1 pt）用于莫尔。多孔CNX的引入使Pt/MoS 2/CNX催化剂的活性位暴露出来，使水分子解离，消除Pt活性位上吸附的CO物种，有利于提高催化剂的耐久性和抗CO能力.此外，具有高比表面积（451.38 m2 g −1）的MoS 2/CNX可以提供足够的含氧官能团，以促进活性Pt位点上的中间体（CO物种）的氧化，这也可以促进甲醇对电活性表面的可及性。这些结果为设计高活性Pt载体/助催化剂以最小化Pt用量提供了有前途的策略。
The problems of poor electrocatalytic activity and CO tolerance and high Pt-loading of the Pt-based catalysts are still needed to be solved for direct methanol fuel cells. In this study, porous MoS2/nitrogen-doped carbon (MoS2/CNX) as Pt supports/co-catalyst for methanol oxidation reaction (MOR) is successfully prepared by using waste bagasse as carbon source. Various material characterization techniques and electrochemical tests are performed to investigate the relationship between structural characteristics and MOR activity. The highly porous structure of CNXcan provide abundant binding sites for growing well-dispersed MoS2with coral-reef structure, which should facilitate the exposure of MoS2edge to improve co-catalytic activity of MoS2/CNX. Pt/MoS2/CNXdisplays a higher mass activity (1030.2 mA mgpt−1) than those of Pt/MoS2/C (710.1 mA mgpt−1) and commercial Pt/C (405.4 mA mgpt−1), owing to that MoS2/CNXcan afford abundant attachment sites to anchor Pt to enlarge the available electrochemically active area (111.2 m2g−1pt) for MOR. With the introduction of porous CNX, more active sites on MoS2edges are exposed out to dissociate water molecule for eliminating adsorbed CO-species on the active sites of Pt, which is conductive to enhance the durability and CO tolerance of Pt/MoS2/CNX. Furthermore, MoS2/CNXwith high specific surface area (451.38 m2g−1) can offer sufficient oxygen-containing functional groups to facilitate the oxidation of intermediates (CO-species) on the active Pt sites, which can also promote the accessibility of methanol to the electroactive surface. These results provide a promising strategy for the design of highly active Pt support/co-catalyst to minimize Pt usage.
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