Preparation of Graphene-Co/Ni/Fe3O4 Nanocomposites and Their Electrocatalytic Activity for Reduction of p-Nitrophenol
Preparation of Graphene-Co/Ni/Fe3O4 Nanocomposites and Their Electrocatalytic Activity for Reduction of p-Nitrophenol
复制标题
石墨烯-Co/Ni/Fe3O4纳米复合材料的制备及其对硝基苯酚还原的电催化活性
DOI：
10.1166/jnn.2020.17307
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发表时间：
2020
影响因子：
--
通讯作者：
Guo Jinxi
中科院分区：
文献类型：
--
作者：
Zhang Xiaorong;Zhang Zhixiao;Li Yufei;Zhang Ling;Wang Dongsheng;Huang Min;Liu Jiehui;Guo Jinxi
以石墨和硝酸盐为原料，采用改进的化学-碳热还原法制备了石墨烯-钴、石墨烯-镍和石墨烯-Fe3O4纳米复合材料。Co、Ni和Fe3O4纳米粒子均匀地负载在石墨烯纳米片的表面，没有严重的折叠和团聚。附着在石墨烯上的Co、Ni和Fe3O4纳米颗粒的平均尺寸分别约为50、60和5 nm。随后，制备了三种新型的石墨烯-Co/Ni/Fe3O4纳米复合修饰玻碳电极，并用循环伏安法研究了它们在磷酸盐缓冲溶液中对对硝基苯酚的电催化还原性能。结果表明，随着扫描速度从70 mV·S−1增加到10 0 mV·S−1，电流值增大，石墨烯-Co/Ni/Fe_3O_4修饰GCEs表面的电化学反应为扩散控制。与未修饰的GCE相比，石墨烯-Co/Ni/Fe3O4纳米复合材料的还原峰电流明显高于未修饰的GCE，证明了石墨烯-Co/Ni/Fe3O4纳米复合材料对对硝基苯酚具有良好的电催化还原能力。
Graphene-based nanocomposites of graphene-Co, graphene-Ni, and graphene-Fe3O4 were synthesized via improved chemical-carbothermal reduction using graphite and nitrates as starting materials. The Co, Ni, and Fe3O4 nanoparticles are uniformly loaded on the surfaces of graphene nanosheets without serious folds and conglomeration. The average dimensions of the Co, Ni, and Fe3O4 nanoparticles attached to graphene are approximately 50, 60, and 5 nm, respectively. Subsequently, three novel types of graphene-Co/Ni/Fe3O4 nanocomposite-modified glassy carbon electrodes (GCEs) were fabricated, and their electrocatalytic activity for reduction of p-nitrophenol was investigated by cyclic voltammetry in phosphate buffer solution. Results show that the current values increase as the scanning rate is increased from 70 mV·s−1 to 100 mV·s−1 and that the electrochemical reactions on the surface of the graphene-Co/Ni/Fe3O4-modified GCEs are diffusion controlled. Compared with the bare GCE, the graphene-Co/Ni/Fe3O4 nanocomposite-modified GCEs display considerably higher reduction peak current, which proves that the graphene-Co/Ni/Fe3O4 nanocomposites possess favorable electrocatalytic ability for reduction of p-nitrophenol.