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NiFe2O4 hollow nanoparticles of small sizes on carbon nanotubes for oxygen evolution
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-08-24 , DOI: 10.1039/d0cy01241f Jianyu Kang 1, 2, 3, 4, 5 , Feng Yan 1, 2, 3, 4, 5 , Chunyan Li 1, 2, 3, 4, 5 , Lihong Qi 1, 2, 3, 4, 5 , Bo Geng 4, 5, 6, 7 , Yue Wang 1, 2, 3, 4, 5 , Chunling Zhu 4, 5, 6, 7 , Yujin Chen 1, 2, 3, 4, 5
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-08-24 , DOI: 10.1039/d0cy01241f Jianyu Kang 1, 2, 3, 4, 5 , Feng Yan 1, 2, 3, 4, 5 , Chunyan Li 1, 2, 3, 4, 5 , Lihong Qi 1, 2, 3, 4, 5 , Bo Geng 4, 5, 6, 7 , Yue Wang 1, 2, 3, 4, 5 , Chunling Zhu 4, 5, 6, 7 , Yujin Chen 1, 2, 3, 4, 5
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The efficiency of electrochemical hydrogen production is limited by the sluggish oxygen evolution reaction (OER) occurring at the anode. Herein, CNT-supported Ni–Fe bimetallic oxide hollow nanoparticles (NiFe2O4-HNP/CNTs) based on the Kirkendall effect were fabricated via a facile method. These NiFe2O4 hollow nanoparticles were uniformly distributed on the outmost surfaces of the CNTs with an ultra-small size of about 10 nm in diameter and 3 nm in wall thickness, which provide a significantly increased number of active sites and reduced charge transfer resistance for OER. As a result, the as-synthesized NiFe2O4-HNP/CNTs exhibit excellent OER performance with a current density of 10 mA cm−2 at a low overpotential of 260 mV and a small Tafel slope of 40 mV dec−1 as well as robust stability, superior to the benchmark IrO2 catalyst. Our results demonstrate that constructing hollow nanostructures with a small size on the conductive substrate is an efficient strategy for highly efficient oxygen evolution.
中文翻译：
碳纳米管上小尺寸的NiFe2O4空心纳米颗粒，用于析氧
电化学产氢的效率受到阳极发生的缓慢的放氧反应（OER）的限制。在此，通过一种简便的方法制备了基于柯肯德尔效应的CNT负载的Ni-Fe双金属氧化物空心纳米粒子（NiFe 2 O 4 -HNP / CNTs）。这些NiFe 2 O 4空心纳米粒子均匀分布在CNT的最外表面，直径约为10 nm，壁厚为3 nm，具有超小的尺寸，从而显着增加了活性位点的数量并降低了电荷转移阻力用于OER。结果，合成后的NiFe 2 O 4-HNP / CNT在260 mV的低过电势和40 mV dec -1的小Tafel斜率下具有10 mA cm -2的电流密度，具有出色的OER性能，其稳定性优于标准IrO 2催化剂。我们的结果表明，在导电基底上构建小尺寸的中空纳米结构是高效释放氧气的有效策略。
更新日期：2020-10-19
中文翻译：
碳纳米管上小尺寸的NiFe2O4空心纳米颗粒，用于析氧
电化学产氢的效率受到阳极发生的缓慢的放氧反应（OER）的限制。在此，通过一种简便的方法制备了基于柯肯德尔效应的CNT负载的Ni-Fe双金属氧化物空心纳米粒子（NiFe 2 O 4 -HNP / CNTs）。这些NiFe 2 O 4空心纳米粒子均匀分布在CNT的最外表面，直径约为10 nm，壁厚为3 nm，具有超小的尺寸，从而显着增加了活性位点的数量并降低了电荷转移阻力用于OER。结果，合成后的NiFe 2 O 4-HNP / CNT在260 mV的低过电势和40 mV dec -1的小Tafel斜率下具有10 mA cm -2的电流密度，具有出色的OER性能，其稳定性优于标准IrO 2催化剂。我们的结果表明，在导电基底上构建小尺寸的中空纳米结构是高效释放氧气的有效策略。
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