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Nickel‐Doping Effect on Mn3O4 Nanoparticles for Electrochemical Water Oxidation under Neutral Condition
Small Methods ( IF 10.7 ) Pub Date : 2020-01-20 , DOI: 10.1002/smtd.201900733 Jung Sug Hong 1 , Hongmin Seo 1 , Yoon Ho Lee 1 , Kang Hee Cho 1 , Changwan Ko 1 , Sunghak Park 1 , Ki Tae Nam 1
Small Methods ( IF 10.7 ) Pub Date : 2020-01-20 , DOI: 10.1002/smtd.201900733 Jung Sug Hong 1 , Hongmin Seo 1 , Yoon Ho Lee 1 , Kang Hee Cho 1 , Changwan Ko 1 , Sunghak Park 1 , Ki Tae Nam 1
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As the demand for energy has dramatically increased in the past decade, electrochemical water splitting has been regarded as an attractive approach to produce renewable hydrogen energy. However, large overpotentials of oxygen‐evolving reaction (OER) is a key bottleneck for practical application. Thus, water‐oxidizing electrocatalysts with low cost and high efficiency should be developed. Here, 5 nm‐sized Mn3O4 nanoparticles (NPs) are synthesized by a hydrothermal method, which is appropriate for large‐scale production. To further improve their performance, various 3d transition metal elements are successfully doped in Mn3O4 NPs. Ni‐doped Mn3O4 NPs exhibit the highest efficiency among the Mn3O4 NPs doped with various elements. Based on structural analysis, the Ni‐doping process leads to the lattice distortion of their tetragonal spinel structure and it strongly correlates with the enhancement of OER activity. The overpotential at the current density of 10 mA cm–2 is 524 and 458 mV for pristine and 5 at% doped Mn3O4 NPs under neutral condition. The heteroatom‐doping process in sub‐10 nm‐sized nanocatalysts is expected to be a promising methodology to induce distorted structure related to active species. Thus, it can be effective to improve catalytic performance of various heterogeneous nano‐catalysts.
中文翻译：
中性条件下镍掺杂对Mn3O4纳米粒子电化学水氧化的影响
在过去十年中，随着对能源的需求急剧增加，电化学水分解被视为生产可再生氢能源的一种有吸引力的方法。但是，大量的放氧反应（OER）超电势是实际应用的关键瓶颈。因此，应开发低成本，高效率的水氧化型电催化剂。在这里，通过水热法合成了5 nm大小的Mn 3 O 4纳米颗粒（NPs），适合大规模生产。为了进一步提高其性能，已将各种3d过渡金属元素成功掺杂到Mn 3 O 4 NP中。掺镍Mn 3 O 4在掺杂有各种元素的Mn 3 O 4 NP中，NP表现出最高的效率。根据结构分析，Ni掺杂过程会导致其四方尖晶石结构的晶格畸变，并且与OER活性的增强密切相关。在中性条件下，原始电流和5 at％掺杂的Mn 3 O 4 NP在10 mA cm –2的电流密度下的过电势为524和458 mV 。预计亚10纳米大小的纳米催化剂中的杂原子掺杂过程将是诱导与活性物种相关的扭曲结构的有前途的方法。因此，可以有效地提高各种非均相纳米催化剂的催化性能。
更新日期：2020-01-21
中文翻译：
中性条件下镍掺杂对Mn3O4纳米粒子电化学水氧化的影响
在过去十年中，随着对能源的需求急剧增加，电化学水分解被视为生产可再生氢能源的一种有吸引力的方法。但是，大量的放氧反应（OER）超电势是实际应用的关键瓶颈。因此，应开发低成本，高效率的水氧化型电催化剂。在这里，通过水热法合成了5 nm大小的Mn 3 O 4纳米颗粒（NPs），适合大规模生产。为了进一步提高其性能，已将各种3d过渡金属元素成功掺杂到Mn 3 O 4 NP中。掺镍Mn 3 O 4在掺杂有各种元素的Mn 3 O 4 NP中，NP表现出最高的效率。根据结构分析，Ni掺杂过程会导致其四方尖晶石结构的晶格畸变，并且与OER活性的增强密切相关。在中性条件下，原始电流和5 at％掺杂的Mn 3 O 4 NP在10 mA cm –2的电流密度下的过电势为524和458 mV 。预计亚10纳米大小的纳米催化剂中的杂原子掺杂过程将是诱导与活性物种相关的扭曲结构的有前途的方法。因此，可以有效地提高各种非均相纳米催化剂的催化性能。
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