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Three-dimensional flower-like NiCo2O4/CNT for efficient catalysis of the oxygen evolution reaction

机译：三维花状NiCo2O4 / CNT可有效催化氧释放反应

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摘要

The oxygen evolution reaction (OER) is an important reaction especially in water splitting and metal–air batteries. Highly efficient non-noble metal based electrocatalysts are urgently required to be developed and to replace the commercial Ru/Ir based oxide. Herein, we report the three-dimensional hierarchical NiCo _(2) O _(4) /CNT-150 composite with high activity for the OER that was synthesized via a hydrothermal reaction and subsequent annealing. Compared with CNTs, commercial RuO _(2) catalysts, NiCo _(2) O _(4) /CNT, NiCo _(2) O _(4) /CNT-250, and NiCo _(2) O _(4) /CNT-150 exhibit enhanced electrocatalytic performance with a lower onset overpotential of 300 mV and the corresponding Tafel slope of 129 mV per decade. The flower-like NiCo _(2) O _(4) /CNT-150 shows an excellent catalysis performance with higher current density than the commercial RuO _(2) catalyst. Moreover, the NiCo _(2) O _(4) /CNT-150 demonstrates the excellent long-term durability in 0.1 mol L ~(?1) KOH for the OER. The significant catalytic performances are ascribed to the excellent conductivity of CNTs and the high specific surface area of the three dimensional flower-like NiCo _(2) O _(4) .
机译：析氧反应（OER）是重要的反应，尤其是在水分解和金属空气电池中。迫切需要开发高效的基于非贵金属的电催化剂并替代商业的基于Ru / Ir的氧化物。在这里，我们报告了三维分层NiCo _（2）O _（4）/ CNT-150复合材料，该复合材料对OER具有高活性，是通过水热反应和随后的退火反应合成的。与CNT相比，商用RuO _（2）催化剂，NiCo _（2）O _（4）/ CNT，NiCo _（2）O _（4）/ CNT-250和NiCo _（2）O _（4 ）/ CNT-150表现出增强的电催化性能，较低的起始过电势为300 mV，相应的Tafel斜率为每十年129 mV。花状的NiCo _（2）O _（4）/ CNT-150比市售RuO _（2）催化剂具有优异的催化性能和更高的电流密度。此外，NiCo _（2）O _（4）/ CNT-150在OER为0.1 mol L〜（？1）KOH时显示出优异的长期耐久性。显着的催化性能归因于碳纳米管的优异电导率和三维花状NiCo _（2）O _（4）的高比表面积。

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