Ultrathin Nanosheet-Assembled Co-Fe Hydroxide Nanotubes: Sacrificial Template Synthesis, Topotactic Transformation, and Their Application as Electrocatalysts for Efficient Oxygen Evolution Reaction
Ultrathin Nanosheet-Assembled Co-Fe Hydroxide Nanotubes: Sacrificial Template Synthesis, Topotactic Transformation, and Their Application as Electrocatalysts for Efficient Oxygen Evolution Reaction
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超薄纳米片组装的氢氧化钴铁纳米管：牺牲模板合成、拓扑转化及其作为高效析氧反应电催化剂的应用
DOI：
10.1021/acsami.0c15253
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发表时间：
2020
影响因子：
9.5
通讯作者：
Ma Renzhi
中科院分区：
文献类型：
--
作者：
Wang Hao;Wang Haoji;Wan Hao;Wu Dan;Chen Gen;Zhang Ning;Cao Yijun;Liu Xiaohe;Ma Renzhi
氢能作为一种可靠、可持续、高效的能源载体，可以有效缓解全球环境问题和能源危机。然而，用于大规模制氢的水的电化学裂解仍然受到阳极处的析氧反应（OER）的缓慢动力学的阻碍。考虑到Co和Fe对提高OER催化活性的协同作用，我们采用牺牲模板法制备了Co-Fe氢氧化物纳米管。在1.0 M KOH溶液中，Co0.8Fe0.2氢氧化物纳米管对OER表现出显著的电催化性能，在10 mA cm（-2）下的过电位为246 mV，Tafel斜率为53 mV dec（-1）。通过磷化处理进一步制备了Co0.8Fe0.2P纳米管，在10 mA cm（-2）下过电位低至240 mV，表现出优异的OER催化性能。此外，负载在泡沫镍上的Co0.8Fe0.2P纳米管（Co0.8Fe0.2P/NF）用作双电极系统中的正负极，在10 mA cm（-2）下达到约1.67 V的电池电压，并且表现出优异的稳定性。通过将Co0.8Fe0.2P/NF电极与晶体硅太阳能电池连接构建了水裂解系统，展示了其作为电催化剂的应用。
Hydrogen as a reliable, sustainable, and efficient energy carrier can effectively alleviate global environmental issues and energy crisis. However, the electrochemical splitting of water for large-scale hydrogen generation is still impeded by the sluggish kinetics of the oxygen evolution reaction (OER) at the anode. Considering the synergistic effect of Co and Fe on the improvement of OER catalytic activity, we prepared Co-Fe hydroxide nanotubes through a facile sacrificial template route. The resultant Co0.8Fe0.2 hydroxide nanotubes exhibited remarkable electrocatalytic performance for OER in 1.0 M KOH, with a small overpotential of about 246 mV at 10 mA cm(-2) and a Tafel slope of 53 mV dec(-1). The Co0.8Fe0.2P nanotubes were further prepared by a phosphidation treatment, exhibiting excellent OER catalytic performance with an overpotential as low as 240 mV at 10 mA cm(-2). Besides, the Co0.8Fe0.2P nanotubes supported on a Ni foam (Co0.8Fe0.2P/NF) used as both positive and negative poles in a two-electrode system achieved a cell voltage of about 1.67 V at 10 mA cm(-2) and exhibited outstanding stability. A water splitting system was constructed by Co0.8Fe0.2P/NF electrodes connected with a crystalline silicon solar cell, demonstrating the application as an electrocatalyst.