Highly dispersed CoP nanoparticles supported on carbon cloth for the enhanced catalytic performance of methanol electro-oxidation
Highly dispersed CoP nanoparticles supported on carbon cloth for the enhanced catalytic performance of methanol electro-oxidation
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碳布负载高度分散的 CoP 纳米粒子，用于增强甲醇电氧化的催化性能
DOI：
10.1016/s1872-5813(22)60040-9
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发表时间：
2022-10
影响因子：
--
通讯作者：
Zhe GAO
中科院分区：
文献类型：
--
作者：
Jian-yuan ZHANG;Shuang-feng XING;Shi-chao ZHAO;Mi XIONG;Bian-qin ZHANG;Xi-li TONG;Yong QIN;Zhe GAO
直接甲醇燃料电池(DMFC)是一种潜在的商业化燃料电池技术，但目前正受到昂贵的贵金属阳极材料的阻碍。开发一种获得均匀分散、粒度分布窄的金属磷化物催化剂的方法仍然是一个挑战。本文采用原子层沉积(ALD)的方法在碳布(CC)上沉积氧化钴，经磷化处理后得到磷化钴。通过改变用于CC的AlD基臭氧脉冲(ALD-O3)的数量，调节了CoO2(AlD-CoOx)在CC上的成核和生长模式，得到了粒径小、分布均匀的CoOx纳米粒子。优化后的CoPx基催化剂(CoPx/40-CC)对甲醇在碱性溶液中的电催化氧化反应表现出良好的催化活性(153 mA/cm2)，经40次AlD-O_3处理后，活性高于浸渍法制备的催化剂(Imp-CoPx/CC)，但COPx负载量低于Imp-CoPx/CC。结果表明，催化剂活性的提高得益于催化剂颗粒的细小和分布的均匀，促进了甲醇电氧化过程的电子传递和传质动力学。
Direct methanol fuel cell (DMFC) is a potential commercial fuel cell technology that is presently hindered by the expensive noble metal materials of the anode. Developing a method to obtain a uniformly dispersed metal phosphide catalyst with narrow size distribution is still a challenge. In this work, cobalt oxide was deposited on carbon cloth (CC) through atomic layer deposition (ALD), then cobalt phosphide was obtained after the phosphorization process. By changing the number of ALD-based ozone pulses (ALD-O 3 ) for CC, the nucleation and growth modes of cobalt oxide (ALD-CoO x ) on the CC were regulated, and CoP x nanoparticles with small particle size and uniform distribution were obtained. The optimized CoP x -based catalyst with 40 cycles of ALD-O 3 treatment (CoP x /40-CC) exhibits excellent activity (153 mA/cm 2 ) toward methanol electrocatalytic oxidation reaction in the alkaline solution, which is higher than the catalyst prepared by impregnation (Imp-CoP x /CC), although the CoP x loading of CoP x /40-CC is lower than that of Imp-CoP x /CC. The results indicate that the enhanced activity benefits from the small particle size and the uniform CoP x distribution, which promote the electron-transfer and mass transport kinetics of the methanol electro-oxidation process.
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