Nanomaterials & System Lab, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju National University, Jeju 63243, Republic of Korea.
Nanomaterials & System Lab, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju National University, Jeju 63243, Republic of Korea; Nanomaterials & System Lab, Major of Mechanical System Engineering, College of Engineering, Jeju National University, Jeju 63243, Republic of Korea; Research Institute of New Energy Industry (RINEI), Jeju National University, Jeju 63243, Republic of Korea.
J Colloid Interface Sci. 2023 May;637:363-371. doi: 10.1016/j.jcis.2023.01.064. Epub 2023 Jan 18.
The development of a non-noble, highly efficient bifunctional catalyst for methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) is the bottleneck in the alkaline direct methanol fuel cells (ADMFC). Ni-based bi/tri metallic alloys are the promising candidates next to the noble metals in the alkaline medium.Herein we present a facile hydrazine-assisted hydrothermal technique to synthesize a trimetallic nickel-cobalt-tin (NiCoSn) alloy as an efficient electrocatalyst for MOR and ORR reactions. The physiochemical analysis confirms the formation of trimetallic alloys with a high surface area. The as-synthesized trimetallic NiCoSn electrocatalyst exhibited superior MOR activity in terms of mass activity (509 mA mg at 1.55 V vs RHE) and stability than the bimetallic alloys in 1.0 M KOH electrolyte. Further, the trimetallic alloy delivered a lower onset and half-wave potential of 0.8 and 0.72 V vs RHE with the favorable four-electron transfer in the oxygen reduction reactions. This work highlights a facile approach for preparing Ni-based trimetallic alloys as a promising candidate for the alkaline direct methanol fuel cells/other catalytic applications.
在碱性直接甲醇燃料电池（ADMFC）中，开发用于甲醇氧化反应（MOR）和氧还原反应（ORR）的非贵金属、高效双功能催化剂是一个瓶颈。在碱性介质中，除了贵金属之外，镍基双/三元金属合金是很有前途的候选材料。在此，我们提出了一种简便的水合肼辅助水热技术，用于合成三元镍-钴-锡（NiCoSn）合金作为 MOR 和 ORR 反应的高效电催化剂。物理化学分析证实了三元合金的形成具有高表面积。在 1.0 M KOH 电解质中，所合成的三元 NiCoSn 电催化剂在质量活性（相对于 RHE，在 1.55 V 时为 509 mA mg）和稳定性方面表现出优于双金属合金的 MOR 活性。此外，三元合金在氧还原反应中具有较低的起始电位和半波电位，分别为 0.8 和 0.72 V 相对于 RHE，并且有利于四电子转移。这项工作突出了一种简便的方法来制备基于 Ni 的三元合金，作为碱性直接甲醇燃料电池/其他催化应用的有前途的候选材料。
