Ultrathin NiCo2Px nanosheets strongly coupled with CNTs as efficient and robust electrocatalysts for overall water splitting
Ultrathin NiCo2Px nanosheets strongly coupled with CNTs as efficient and robust electrocatalysts for overall water splitting
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超薄 NiCo2Px 纳米片与 CNT 强耦合作为整体水分解的高效且稳定的电催化剂
DOI：
10.1039/c7ta11364a
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发表时间：
2018-05-07
影响因子：
11.9
通讯作者：
Liu, Zhao-Qing
中科院分区：
文献类型：
--
作者：
Huang, Can;Ouyang, Ting;Liu, Zhao-Qing
氢是一种很有前途的能源载体，由于其可回收性和无污染的性质，成为化石燃料的替代品。水分解是生产高纯氢气的有效方法；然而，它需要高效、低成本和耐用的催化剂。在此，开发了一种简单的方法来合成锚定在功能化碳纳米管（NiCo2Px/CNT）上的自组装3D层状NiCo2Px，以实现具有成本效益、高活性和稳健的电催化剂，以实现1 M KOH中的整体水分解。值得注意的是，在电流密度为 10 mA cm−2 时，析氢反应 (HER) 和析氧反应 (OER) 的过电势分别低至 47 和 284 mV。使用NiCo2Px/CNT作为阴极和阳极的水电解装置仅需1.61 V的电池电压即可达到10 mA cm−2的电流密度，并且具有至少48小时的出色耐用性。此外，还讨论了催化机理，特别强调Ni和Co与实际OER活性物种的协同效应。我们的工作不仅建立了一种有前途的电催化剂，而且还提供了增强金属磷化物活性和稳定性的总体策略。
Hydrogen is a promising energy carrier that becomes an alternative to fossil fuels due to its recyclability and pollution-free nature. Water splitting is an effective method for high purity hydrogen production; however, it requires efficient, low-cost and durable catalysts. Herein, a facile method to synthesize self-assembled 3D laminar NiCo2Px anchored on functionalized carbon nanotubes (NiCo2Px/CNTs) is developed for achieving cost-efficient, highly-active, and robust electrocatalysts towards overall water splitting in 1 M KOH. Notably, the overpotentials at a current density of 10 mA cm−2 are as low as 47 and 284 mV for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. The water electrolyzer device using NiCo2Px/CNTs as both the cathode and anode only requires a cell voltage of 1.61 V to reach a current density of 10 mA cm−2 along with outstanding durability for at least 48 h. Furthermore, the catalytic mechanism was discussed with a special emphasis on the synergetic effect of Ni and Co and real OER active species. Our work not only establishes a promising electrocatalyst, but also provides a general strategy to enhance the activity and stability of metal phosphides.