In Situ, Fast, High‐Temperature Synthesis of Nickel Nanoparticles in Reduced Graphene Oxide Matrix
In Situ, Fast, High‐Temperature Synthesis of Nickel Nanoparticles in Reduced Graphene Oxide Matrix
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DOI：
10.1002/aenm.201601783
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发表时间：
2017-06
影响因子：
27.8
通讯作者：
Yiju Li;Yanan Chen;A. Nie;A. Lu;R. Jacob;Tingting Gao;Jianwei Song;J. Dai;J. Wan;Glenn Pastel;M. Zachariah;R. Yassar;Liangbing Hu
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文献类型：
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作者：
Yiju Li;Yanan Chen;A. Nie;A. Lu;R. Jacob;Tingting Gao;Jianwei Song;J. Dai;J. Wan;Glenn Pastel;M. Zachariah;R. Yassar;Liangbing Hu
首次报道了在还原氧化石墨烯 (RGO) 基质 (nano-Ni@C/RGO) 上合成碳包覆镍 (Ni) 纳米粒子的快速加热-冷却过程，作为高性能 H2O2 燃料催化剂。焦耳加热温度可达约2400 K，加热时间可小于0.1 s。平均直径为2微米的镍微粒可以直接转化为平均直径为75纳米的纳米颗粒。在直接过氧化物-过氧化物燃料电池中，对嵌入 RGO 中的 Ni 纳米粒子作为 H2O2 燃料的电氧化性能进行了评估，其在 0.2 V 下的电氧化电流密度为 602 mA cm−2（相对于 Ag/AgCl），约比嵌入 RGO 基质中的原始 Ni 微粒（微米 Ni/RGO）高 150 倍。高温、快速的焦耳加热过程还在 Ni 纳米粒子的表面形成了 4-5 nm 的保形碳涂层，将它们固定在 RGO 纳米片上，并导致优异的催化稳定性。通过焦耳加热新开发的纳米Ni@C/RGO复合材料为一系列新兴能源应用带来了巨大的希望，包括燃料电池的先进阳极材料。
For the first time, a fast heating–cooling process is reported for the synthesis of carbon‐coated nickel (Ni) nanoparticles on a reduced graphene oxide (RGO) matrix (nano‐Ni@C/RGO) as a high‐performance H2O2 fuel catalyst. The Joule heating temperature can reach up to ≈2400 K and the heating time can be less than 0.1 s. Ni microparticles with an average diameter of 2 µm can be directly converted into nanoparticles with an average diameter of 75 nm. The Ni nanoparticles embedded in RGO are evaluated for electro‐oxidation performance as a H2O2 fuel in a direct peroxide–peroxide fuel cell, which exhibits an electro‐oxidation current density of 602 mA cm−2 at 0.2 V (vs Ag/AgCl), ≈150 times higher than the original Ni microparticles embedded in the RGO matrix (micro‐Ni/RGO). The high‐temperature, fast Joule heating process also leads to a 4–5 nm conformal carbon coating on the surface of the Ni nanoparticles, which anchors them to the RGO nanosheets and leads to an excellent catalytic stability. The newly developed nano‐Ni@C/RGO composites by Joule heating hold great promise for a range of emerging energy applications, including the advanced anode materials of fuel cells.