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首页> 外文期刊>RSC Advances >Room-temperature synthetic NiFe layered double hydroxide with different anions intercalation as an excellent oxygen evolution catalyst
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Room-temperature synthetic NiFe layered double hydroxide with different anions intercalation as an excellent oxygen evolution catalyst

机译：具有不同阴离子嵌入的室温合成NiFe层状双氢氧化物是优良的析氧催化剂

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摘要

The Ni-Fe layered double hydroxide (LDH) is regarded one of the best catalysts for the oxygen evolution reaction (OER), yet bridging the relationship between the LDH nanostructure and OER performance still remains a big challenge. Instead of using other hydrothermal reactions to produce Ni-Fe layered double hydroxides, we adopted a method using a simple separate nucleation and aging steps to investigate the effect of crystallinity and the intercalated anions of LDH on OER performance. We found that improving the crystallinity and the size of NiFe-LDH by increasing the aging temperature led to a decrease of OER activity. Changing the interlayer spacing of LDH from 8.04 angstrom to 7.69 angstrom by introducing more CO32 to replace NO3 causes the reduction of OER activity. These are probably attributed to the more exposed active sites, lower charger transferring resistance, and better exchange ability with OH- in interlamination. Based on the abovementioned observations and the consequent optimizations, a very-low onset overpotential (similar to 240 mV) and Tafel slope value (33.6 mV dec(-1)) (in 0.1 mol L-1 KOH) for room-temperature synthetic NiFe LDH were achieved. This work proposes a strategy for the rational design of LDHs for the further enhancement of OER electrochemical activity, i.e. by decreasing the size and crystallinity of NiFe-LDH and by introducing more NO3- between layers.
机译：Ni-Fe层状双氢氧化物（LDH）被认为是氧释放反应（OER）的最佳催化剂之一，然而，桥接LDH纳米结构和OER性能之间的关系仍然是一个巨大的挑战。代替使用其他水热反应生产Ni-Fe层状双氢氧化物，我们采用了一种使用简单的单独成核和时效步骤的方法来研究结晶度和LDH的插入阴离子对OER性能的影响。我们发现，通过提高时效温度来改善NiFe-LDH的结晶度和尺寸会导致OER活性降低。通过引入更多的CO32替代NO3将LDH的层间距从8.04埃更改为7.69埃，会导致OER活性降低。这些可能归因于更多的活性位点，较低的电荷转移阻力以及在层间与OH-的更好交换能力。基于上述观察和随后的优化，室温合成NiFe的起始过电位非常低（类似于240 mV）和Tafel斜率值（33.6 mV dec（-1））（在0.1 mol L-1 KOH中）实现了LDH。这项工作提出了合理设计LDH的策略，以进一步提高OER电化学活性，即通过减小NiFe-LDH的尺寸和结晶度以及在层之间引入更多的NO3-来实现。

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