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Electrochemically Exfoliated β-Co(OH)2 Nanostructures for Enhanced Oxygen Evolution Electrocatalysis
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-24 00:00:00 , DOI: 10.1021/acsaem.9b01901
Naduvile Purayil Dileep 1 , Thazhe Veettil Vineesh 1 , Prasad V. Sarma 1 , Muhsin V. Chalil 1 , Ciril Samuel Prasad 1 , M. M. Shaijumon 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-24 00:00:00 , DOI: 10.1021/acsaem.9b01901
Naduvile Purayil Dileep 1 , Thazhe Veettil Vineesh 1 , Prasad V. Sarma 1 , Muhsin V. Chalil 1 , Ciril Samuel Prasad 1 , M. M. Shaijumon 1
Affiliation
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Exploring highly efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is very important for the development of renewable energy conversion and storage systems. Layered metal hydroxides have been studied with great interest owing to their high electrochemical activity and stability toward OER. Herein, we demonstrate an efficient approach to engineer the surface active sites in β-Co(OH)2 for enhanced electrocatalysis of OER. We employ a single-step bipolar electrochemical technique for the exfoliation of pristine β-Co(OH)2(Co(OH)2-Bulk) into thinner and smaller sheets. The as-synthesized Co(OH)2 nanostructures with improved active sites exhibit enhanced electrocatalytic activity toward OER with a very low overpotential of 390 mV at 10 mA cm–2 and a Tafel slope of 57 mV dec–1 in alkaline media. The results provide a promising lead for the development of efficient and economically viable electrode materials for oxygen evolution electrocatalysis.
中文翻译:
电化学剥落的β-Co(OH)2纳米结构增强的析氧电催化作用
探索用于氧气释放反应(OER)的高效且低成本的电催化剂对于可再生能源转化和存储系统的开发非常重要。层状金属氢氧化物由于其高的电化学活性和对OER的稳定性而受到了极大的关注。在这里,我们展示了一种有效的方法来工程化β-Co(OH)2中的表面活性位点,以增强OER的电催化作用。我们采用单步双极电化学技术将原始的β-Co(OH)2(Co(OH)2 -Bulk)剥离成更薄和较小的薄片。合成后的Co(OH)2具有改善的活性位点的纳米结构对OER表现出增强的电催化活性,在10 mA cm –2时极低的390 mV过电势,在碱性介质中的Tafel斜率为57 mV dec –1。该结果为开发用于氧气析出电催化的高效且经济可行的电极材料提供了有希望的线索。
更新日期:2020-01-24
中文翻译:

电化学剥落的β-Co(OH)2纳米结构增强的析氧电催化作用
探索用于氧气释放反应(OER)的高效且低成本的电催化剂对于可再生能源转化和存储系统的开发非常重要。层状金属氢氧化物由于其高的电化学活性和对OER的稳定性而受到了极大的关注。在这里,我们展示了一种有效的方法来工程化β-Co(OH)2中的表面活性位点,以增强OER的电催化作用。我们采用单步双极电化学技术将原始的β-Co(OH)2(Co(OH)2 -Bulk)剥离成更薄和较小的薄片。合成后的Co(OH)2具有改善的活性位点的纳米结构对OER表现出增强的电催化活性,在10 mA cm –2时极低的390 mV过电势,在碱性介质中的Tafel斜率为57 mV dec –1。该结果为开发用于氧气析出电催化的高效且经济可行的电极材料提供了有希望的线索。