Hierarchical Structure of CoMn Nanoparticles Encapsulated in N-Doped Carbon Nanotube Frameworks Grown on Nickel Foam for Water Splitting,ACS Sustainable Chemistry & Engineering

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Hierarchical Structure of CoMn Nanoparticles Encapsulated in N-Doped Carbon Nanotube Frameworks Grown on Nickel Foam for Water Splitting
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-09-14 , DOI: 10.1021/acssuschemeng.3c03959
Qihang Yang ₁ , Youxing Yu ₁ , Xiaofang Bi ₁

Affiliation

Water splitting is an effective approach to produce hydrogen. The direct electrocatalysis of seawater can avoid the use of limited freshwater resources and facilitate large-scale hydrogen production, but stable and efficient electrocatalysts are essential and still challenging. MOF derivatives supported on conductive substrates exhibit promising performances for water splitting. Therefore, we present a two-step approach to construct hierarchical N-doped carbon nanotubes encapsulating Mn₃Co₇ nanoparticles frameworks by pyrolyzing CoMn-MOF grown on nickel foam. In 1.0 M KOH, the catalyst demonstrates remarkable electrocatalytic performance with low overpotentials of 115 and 210 mV for HER and OER, respectively, and achieves a cell voltage of 1.60 V at 10 mA·cm^–2 for overall water splitting. For seawater splitting, it shows promising HER activity with overpotentials of 130 and 306 mV at 10 and 200 mA·cm^–2 in alkaline seawater. More importantly, in natural seawater, the catalyst exhibits excellent stability and attractive HER overpotential of 331 mV at 10 mA·cm^–2, due to regulatory strategies on metal nanoparticles such as CoMn bialloying, space dispersion and charge transport by carbon nanotubes, carbon layers’ encapsulation, and protection. Our work offers a potential approach to synthesizing self-supporting multimetallic nanocarbon materials for seawater splitting and electrochemical energy devices.

中文翻译：

镍泡沫上生长的 N 掺杂碳纳米管框架封装的 CoMn 纳米粒子的分层结构用于水分解

水分解是制氢的有效途径。海水直接电催化可以避免使用有限的淡水资源并有利于大规模制氢，但稳定高效的电催化剂至关重要且仍然具有挑战性。导电基底上负载的 MOF 衍生物在水分解方面表现出良好的性能。因此，我们提出了一种两步法，通过热解在泡沫镍上生长的CoMn-MOF来构建封装Mn ₃ Co _{7纳米颗粒框架的分层N掺杂碳纳米管。}在1.0 M KOH中，该催化剂表现出卓越的电催化性能，HER和OER的过电位分别为115和210 mV，并在10 mA·cm –2 下实现了1.60 V的电池^电压用于整体水分解。对于海水裂解，它显示出良好的 HER 活性，在碱性海水中， 10 和 200 mA·cm ^–2的过电势分别为 130 和 306 mV 。更重要的是，在天然海水中，由于CoMn双合金化、空间分散和碳纳米管、碳层的电荷传输等金属纳米颗粒的调控策略，该催化剂在10 mA·cm ^–2下表现出优异的稳定性和331 mV的有吸引力的HER过电势' 封装和保护。我们的工作为合成用于海水分解和电化学能源装置的自支撑多金属纳米碳材料提供了一种潜在的方法。

更新日期：2023-09-14

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