Ultrafine CoP Nanoparticles Supported on Carbon Nanotubes as Highly Active Electrocatalyst for Both Oxygen and Hydrogen Evolution in Basic Media
Ultrafine CoP Nanoparticles Supported on Carbon Nanotubes as Highly Active Electrocatalyst for Both Oxygen and Hydrogen Evolution in Basic Media
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碳纳米管负载的超细 CoP 纳米粒子作为碱性介质中析氧和析氢的高活性电催化剂
DOI：
10.1021/acsami.5b09207
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发表时间：
2015-12-30
影响因子：
9.5
通讯作者：
Chen, Yong
中科院分区：
文献类型：
--
作者：
Hou, Chun-Chao;Cao, Shuang;Chen, Yong
开发用于两个半反应：H-2和O-2析出反应（HER和OER）的低成本、高活性电催化剂仍然是实现水裂解的巨大挑战。在此，我们报道了CoP纳米颗粒（NPs）可以作为HER和OER的双功能催化剂。特别地，修饰在N掺杂的多壁碳纳米管（MWCNT）上的超细CoP NPs在0.1M NaOH水溶液中对OER表现出显著的催化性能，具有290 mV的低起始过电位，50 mV dec（-1）的Tafel斜率，在10 mA cm（-2）下的330 mV的超电势（eta）和大约100%的法拉第效率，与现有技术的Co基OER催化剂（包括Co 3 O 4、CoSe 2和Co-Pi）的性能相当。该混合催化剂能够保持高催化电流密度至少10小时而没有任何催化活性损失。同时，在相同的碱性条件下，不含贵金属的催化剂也表现出良好的HER活性和耐久性。
The development of low-cost and highly active electrocatalysts for two half reactions: H-2 and O-2 evolution reactions (HER and OER), is still a huge challenge to realize water splitting. Herein, we report that CoP nanoparticles (NPs) can act as a bifunctional catalyst for both HER and OER Particularly, ultrafine CoP NPs decorated on N doped multiwalled carbon nanotube (MWCNT) exhibit remarkable catalytic performance for OER in 0.1 M NaOH aqueous solution, with a low onset overpotential of 290 mV, a Tafel slope of 50 mV dec(-1), an overpotential (eta) of 330 mV at 10 mA cm(-2), and approximately 100% Faradaic efficiency, paralleling the performance of state-of-the-art Co based OER catalysts including Co3O4, CoSe2, and Co-Pi. The hybrid catalyst is capable of maintaining a high catalytic current density for at least 10 h without any loss of catalytic activity. Meanwhile, the noble metal-free catalyst also shows good activity and duarability for HER under the same basic condition.