Honeycombed-like nanosheet array composite NiCo2O4/rGO for efficient methanol electrooxidation and supercapacitors
Honeycombed-like nanosheet array composite NiCo2O4/rGO for efficient methanol electrooxidation and supercapacitors
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用于高效甲醇电氧化和超级电容器的蜂窝状纳米片阵列复合材料 NiCo2O4/rGO
DOI：
10.1016/j.electacta.2020.137145
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发表时间：
2020-12
影响因子：
6.6
通讯作者：
Hui Zhang
中科院分区：
文献类型：
--
作者：
Zhuojun Wei;Jiawei Guo;Meiyue Qu;Zenan Guo;Hui Zhang
采用预调pH的水溶液制备了一系列新型蜂窝状复合材料NiCo 2 O 4/rGO-T（rGO：还原氧化石墨烯，T：200、250和300 °C）。柠檬酸辅助的相共沉淀策略，随后在N2流中退火。NiCo 2 O 4/rGO-250显示出最均匀的高度有序的蜂窝状纳米片阵列形态，其由在rGO表面两侧垂直生长的交错中孔纳米片（~110 nm × 12 nm）组成，具有最高的结晶度、更高的表面积（145 m2 g −1）、双峰孔径分布（3.4和12.5 nm）以及沿着高度开放的大孔网络。NiCo 2 O 4/rGO-250电极具有最高的甲醇氧化反应电流密度，在0.6 V下为90 A g− 1，以及高循环稳定性（500次循环后为94%，使用新鲜电解质恢复到98%），这是迄今为止报道的具有类似组成的催化剂中最好的一种。同时，NiCo 2 O 4/rGO-250电极表现出相当大的比电容1380 F g− 1在1 A g−1，高倍率性能（10 A g−1，967 F g−1），和良好的循环稳定性，保持90%，在5 A g− 1在1000个充电-放电循环的超级电容器。NiCo 2 O 4/rGO-250电极优异的电化学性能归因于高度有序的蜂窝状介孔纳米片阵列沿着增大的比表面积暴露出更多的活性位点，相邻的NiCo 2 O 4纳米片形成的高度开放的大孔网络提供了更多的离子/电子扩散路径和电解质的有效接触面积，NiCo 2 O 4- rGO的协同作用使其具有良好的导电性和结构稳定性，从而大大促进了电极内和电解质/电极界面上电子和离子的转移。
A series of novel honeycombed-like composites NiCo2O4/rGO-T (rGO: reduced graphene oxide,T: 200, 250 and 300 °C) were obtained by a pre-adjusted pH value aq. phase coprecipitation strategy assisted by citric acid, followed annealing in N2flow. The NiCo2O4/rGO-250 shows the most uniformly highly-ordered honeycombed-like nanosheet array morphology consisting of ultrathin mesoporous nanosheets (~110 nm × 12 nm) interdigitated vertically grown on the rGO surface in both sides with the highest crystallinity, higher surface area (145 m2g−1), bimodal pore size distribution (3.4 and 12.5 nm) along with the highly open macroporous networks. The NiCo2O4/rGO-250 electrode exhibits the highest current density for methanol oxidation reaction of 90 A g−1at 0.6 V, as well as high cycling stability (94% after 500 cycles, returned to 98% with fresh electrolyte), which is the best one so far among reported catalysts with similar compositions. Simultaneously, NiCo2O4/rGO-250 electrode exhibits considerable specific capacitance of 1380 F g−1at 1 A g−1, high rate performance (10 A g−1, 967 F g−1), and good cycling stability which remains 90% at 5 A g−1after 1000 charge–discharge cycles for supercapacitor. The excellent electrochemical performance of the NiCo2O4/rGO-250 electrode can be attributed to the highly-ordered honeycombed-like mesoporous nanosheet array along with the greatly increased specific surface area exposing more active sites, the highly open macroporous networks formed by adjacent ultrathin NiCo2O4nanosheets providing more ion/electron diffusion paths and effective contact area of electrolyte, and the strong NiCo2O4– rGO synergy endowing excellent conductivity and structural robustness, thus greatly facilitate the transfer of electrons and ions in electrode and at the electrolyte/electrode interface.
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影响因子：
32.5
作者：
T. M. Gür
通讯作者：
T. M. Gür
界面极化问题：通过还原氧化石墨烯涂层增强尖晶石 NiCo2O4 纳米线的超级电容器性能
影响因子：
6.6
作者：
Zhang Cheng;Lei Chenglong;Cen Chao;Tang Shaolong;Deng Mingsen;Li Yuliang;Du Youwei
通讯作者：
Du Youwei
影响因子：
7.2
作者：
Jingnan Zheng;Kailu Huang;Guangya Hou;Zhang Huibin-;Huazhen Cao
通讯作者：
Jingnan Zheng;Kailu Huang;Guangya Hou;Zhang Huibin-;Huazhen Cao
影响因子：
11.9
作者：
Li, Linlin;Cheah, Yanling;Srinivasan, Madhavi
通讯作者：
Srinivasan, Madhavi
微波辅助合成多孔纳米片状纳米球NiCo2O4及其在甲醇电催化氧化中的应用
影响因子：
9.2
作者：
Gu, Li;Qian, Lei;Xiao, Dan
通讯作者：
Xiao, Dan