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Cobalt-Nanoparticle-Decorated Cobalt–Molybdenum Bimetal Oxides Embedded in Flower-like N-Doped Carbon as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-08-09 , DOI: 10.1021/acssuschemeng.1c02472 Yanan Zhang 1 , Wenlong Ye 1 , Jinchen Fan 1, 2 , Volkan Cecen 3 , Penghui Shi 1, 2 , Yulin Min 1, 2 , Qunjie Xu 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-08-09 , DOI: 10.1021/acssuschemeng.1c02472 Yanan Zhang 1 , Wenlong Ye 1 , Jinchen Fan 1, 2 , Volkan Cecen 3 , Penghui Shi 1, 2 , Yulin Min 1, 2 , Qunjie Xu 1, 2
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The development of high-efficiency and cost-efficient oxygen evolution reaction (OER) catalysts is a core issue in the sector of water electrolysis. Cobalt–molybdenum bimetal oxide (Co2Mo3O8), as a kind of non-noble transition-metal oxides, is broadly employed as a good OER catalyst due to its abundant active sites. However, the relatively low conductivity of Co2Mo3O8 limits further improvement in its electrocatalytic performance. Herein, the cobalt nanoparticle-modified Co2Mo3O8 flakes are embedded into the flower-like N-doped carbon (NC) microspheres to effectively improve the electrocatalytic OER performance. The combination of Co2Mo3O8 and NC with a flower-like structure effectively improves the conductivity of the material while enhancing the electrolyte penetration. More importantly, the Co nanoparticles (NPs) on the surface of Co2Mo3O8 flakes have the capability to furnish more active electrocatalytic active sites. The obtained Co NP-modified Co2Mo3O8 embedded flower-like NC microspheres (Co/Co2Mo3O8@NC) exhibited an overpotential of 288 mV at 10 mA·cm–2, which was relatively low in comparison to that of commercial RuO2. Besides, the Co/Co2Mo3O8@NC also shows long-term durability almost without attenuation after the 44 000 s I–T test.
中文翻译：
钴纳米粒子装饰的钴钼双金属氧化物嵌入花状 N 掺杂碳中，作为一种耐用且高效的析氧反应电催化剂
开发高效且具有成本效益的析氧反应（OER）催化剂是水电解领域的核心问题。钴钼双金属氧化物（Co 2 Mo 3 O 8）作为一种非贵重的过渡金属氧化物，由于其丰富的活性位点而被广泛用作良好的OER催化剂。然而，Co 2 Mo 3 O 8相对较低的电导率限制了其电催化性能的进一步提高。在此，钴纳米粒子修饰的 Co 2 Mo 3 O 8薄片嵌入花状掺氮碳（NC）微球中以有效提高电催化OER性能。Co 2 Mo 3 O 8与具有花状结构的NC的结合有效地提高了材料的导电性，同时增强了电解质的渗透性。更重要的是，Co 2 Mo 3 O 8薄片表面的Co纳米颗粒（NPs）能够提供更多活性的电催化活性位点。得到的Co NP修饰的Co 2 Mo 3 O 8包埋花状NC微球(Co/Co 2 Mo 3 O 8@NC) 在 10 mA·cm –2 下表现出 288 mV 的过电位，与商业 RuO 2相比，该过电位相对较低。此外，Co/Co 2 Mo 3 O 8 @NC 在 44 000 s I - T测试后也显示出几乎没有衰减的长期耐用性。
更新日期：2021-08-23
中文翻译：
钴纳米粒子装饰的钴钼双金属氧化物嵌入花状 N 掺杂碳中，作为一种耐用且高效的析氧反应电催化剂
开发高效且具有成本效益的析氧反应（OER）催化剂是水电解领域的核心问题。钴钼双金属氧化物（Co 2 Mo 3 O 8）作为一种非贵重的过渡金属氧化物，由于其丰富的活性位点而被广泛用作良好的OER催化剂。然而，Co 2 Mo 3 O 8相对较低的电导率限制了其电催化性能的进一步提高。在此，钴纳米粒子修饰的 Co 2 Mo 3 O 8薄片嵌入花状掺氮碳（NC）微球中以有效提高电催化OER性能。Co 2 Mo 3 O 8与具有花状结构的NC的结合有效地提高了材料的导电性，同时增强了电解质的渗透性。更重要的是，Co 2 Mo 3 O 8薄片表面的Co纳米颗粒（NPs）能够提供更多活性的电催化活性位点。得到的Co NP修饰的Co 2 Mo 3 O 8包埋花状NC微球(Co/Co 2 Mo 3 O 8@NC) 在 10 mA·cm –2 下表现出 288 mV 的过电位，与商业 RuO 2相比，该过电位相对较低。此外，Co/Co 2 Mo 3 O 8 @NC 在 44 000 s I - T测试后也显示出几乎没有衰减的长期耐用性。
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