A facile strategy to synthesize graphitic carbon-encapsulated core-shell nanocomposites derived from CO2 as functional materials
A facile strategy to synthesize graphitic carbon-encapsulated core-shell nanocomposites derived from CO2 as functional materials
复制标题
一种简单的策略来合成源自二氧化碳的石墨碳封装核壳纳米复合材料作为功能材料
DOI：
10.1016/j.coco.2020.100464
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发表时间：
2020
影响因子：
8
通讯作者：
Dihua Wang
中科院分区：
文献类型：
--
作者：
Rui Yu;Bowen Deng;Kaiyuan Zheng;Xingyi Wang;Kaifa Du;Dihua Wang
一个简单的策略来设计石墨碳封装的镍钴核壳纳米复合材料（镍钴@g-C）是通过一个简单的共电解过程，包括CO2还原。在合适的工艺条件下，由捕获的CO2衍生的碳均匀地沉积在所制备的NiCo颗粒的表面上，以形成均匀的涂层。这是非常有趣的是，揭示的碳涂层是在石墨结构的平均厚度约为70 nm，由于原位催化石墨化还原的过渡金属（Ni，Co）的效果。更有趣的是，发现所形成的石墨涂层可以有效地抑制NiCo核之间的烧结在高的操作温度下，导致NiCo@g-C的颗粒尺寸比没有碳涂层的NiCo合金的颗粒尺寸小。由于这种新型的纳米结构，NiCo@g-C具有优异的磁性能和比裸NiCo合金更高的析氢活性。这一工作为在相对温和的条件下设计具有独特纳米结构的功能性碳包覆金属/合金复合材料提供了新的线索
A facile strategy to design graphitic carbon-encapsulated NiCo core-shell nanocomposites (NiCo@g-C) is achieved by a simple co-electrolysis process involving CO2 reduction. Carbon derived from the captured CO2 is uniformly deposited on the surface of as-prepared NiCo particle to form homogeneous coatings at a suitable processing condition. It is very interesting to reveal that the carbon coatings are in graphitic structures with an average thickness of ~70 nm due to the in-situ catalytic graphitization effect of reduced transition metal (Ni, Co). More interestingly, it is found that the as-formed graphite coatings can effectively inhibit the sintering between NiCo nucleis under a high operating temperature, resulting in the smaller particle size of NiCo@g-C than that of the obtained NiCo alloys without carbon coatings. Owing to the novel nanostructures, the NiCo@g-C shows excellent magnetic properties and enhanced hydrogen evolution reaction activity in comparison with bare NiCo alloys. This work gives a new clue to designing functional carbon-encapsulated metal/alloy composites with unique nanostructures at a relatively mild condition