Ternary transition metal chalcogenides decorated on rGO as an efficient nanocatalyst towards urea electro-oxidation reaction for biofuel cell application
Ternary transition metal chalcogenides decorated on rGO as an efficient nanocatalyst towards urea electro-oxidation reaction for biofuel cell application
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DOI：
10.1016/j.matchemphys.2019.121958
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发表时间：
2020-01-01
影响因子：
4.6
通讯作者：
Salarizadeh, Navvabeh
中科院分区：
文献类型：
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作者：
Salarizadeh, Parisa;Askari, Mohammad Bagher;Salarizadeh, Navvabeh
采用简单的水热法制备了MoS 2、NiS和Co 3S 4三元过渡金属硫族化合物（MCNS）和MCNS/还原氧化石墨烯（MCNS/rGO）复合材料作为尿素电氧化的阳极催化剂。预计具有高比表面积的rGO对MCNS/rGO的催化性能上级MCNS。同时，Mo、Ni、Co的协同作用促进了尿素的氧化，提高了催化剂的性能。通过场发射电子显微镜、透射电子显微镜和X射线衍射谱对复合材料进行了表征。采用循环伏安法对复合材料的电化学性能进行了评价。MCNS/rGO的电催化性能上级MCNS催化剂。将rGO并入MCNS中产生了用于尿素电氧化的高电化学表面积，其在0.6M尿素存在下和20 mVs（-1）的扫描速率下导致比MCNS（3.7mA cm（-2））更高的电流密度（18 mA cm（-2））。在室温下，扫描速率为70 mV·s（-1）时，MCNS/rGO的最大电流密度为43 mA·cm（-2）。此外，基于MCNS和MCNS/rGO的单电池在室温下分别提供7.7mW cm（-2）和21.0mW cm（-2）的最大功率密度。因此，MCNS/rGO可以作为一种良好的电催化剂应用于直接尿素燃料电池。
A ternary transition metal chalcogenide, containing MoS2, NiS, and Co3S4 (MCNS), and MCNS/reduced graphene oxide (MCNS/rGO) composite were prepared as anode catalysts by a simple hydrothermal process for Urea electro-oxidation. It's expected that rGO with high specific surface area provides superior catalytic performance for MCNS/rGO than MCNS. Also, the synergic effect of Mo, NI, and Co in the composite accelerates the urea oxidation and enhances the performance of the catalyst. The composites were characterized by field emission electron microscopy, transition electron microscopy, and X-ray diffraction spectroscopy. Electrochemical properties of composites were evaluated by cyclic voltammetry. The MCNS/rGO demonstrated superior electrocatalytic performance than the MCNS catalyst. The incorporating of rGO into MCNS creates a high electrochemical surface area for urea electro-oxidation that resulted in a higher current density (18 mA cm(-2)) than MCNS (3.7 mA cm(-2)) at the presence of 0.6M urea and the scan rate of 20mVs(-1). The maximum current density obtained 43 mA cm(-2) for MCNS/rGO at the scan rate of 70 mV s(-1) In room temperature. Also, single cells based on MCNS and MCNS/rGO supplied a maximum power density of 7.7 mW cm(-2) and 21.0 mW cm(-2) at room temperature, respectively. Hence, MCNS/rGO can be a favorable electrocatalyst for application in the direct urea fuel cell.