{"title":"3D-Printed Monolith Metallic Ni–Mo Electrodes for Ultrahigh Current Hydrogen Evolution","authors":"Yanran Xun, Hongmei Jin, Yuemeng Li, Shixiang Zhou, Kaixi Zhang, Xi Xu, Win Jonhson, Shuai Chang, Teck Leong Tan, Jun Ding","doi":"10.1002/eem2.12714","DOIUrl":null,"url":null,"abstract":"<p>In this work, we reported a series of monolithic 3D-printed Ni–Mo alloy electrodes for highly efficient water splitting at high current density (1500 mA cm<sup>−2</sup>) with excellent stability, which provides a solution to scale up Ni–Mo catalysts for HER to industry use. All possible Ni–Mo metal/alloy phases were achieved by tuning the atomic composition and heat treatment procedure, and they were investigated through both experiment and simulation, and the optimal NiMo phase shows the best performance. Density functional theory (DFT) calculations elucidate that the NiMo phase has the lowest H<sub>2</sub>O dissociation energy, which further explains the exceptional performance of NiMo. In addition, the microporosity was modulated via controlled thermal treatment, indicating that the 1100 °C sintered sample has the best catalytic performance, which is attributed to the high electrochemically active surface area (ECSA). Finally, the four different macrostructures were achieved by 3D printing, and they further improved the catalytic performance. The gyroid structure exhibits the best catalytic performance of driving 500 mA cm<sup>−2</sup> at a low overpotential of 228 mV and 1500 mA cm<sup>−2</sup> at 325 mV, as it maximizes the efficient bubble removal from the electrode surface, which offers the great potential for high current density water splitting.</p>","PeriodicalId":11554,"journal":{"name":"Energy & Environmental Materials","volume":"7 5","pages":""},"PeriodicalIF":13.0000,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eem2.12714","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy & Environmental Materials","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/eem2.12714","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In this work, we reported a series of monolithic 3D-printed Ni–Mo alloy electrodes for highly efficient water splitting at high current density (1500 mA cm−2) with excellent stability, which provides a solution to scale up Ni–Mo catalysts for HER to industry use. All possible Ni–Mo metal/alloy phases were achieved by tuning the atomic composition and heat treatment procedure, and they were investigated through both experiment and simulation, and the optimal NiMo phase shows the best performance. Density functional theory (DFT) calculations elucidate that the NiMo phase has the lowest H2O dissociation energy, which further explains the exceptional performance of NiMo. In addition, the microporosity was modulated via controlled thermal treatment, indicating that the 1100 °C sintered sample has the best catalytic performance, which is attributed to the high electrochemically active surface area (ECSA). Finally, the four different macrostructures were achieved by 3D printing, and they further improved the catalytic performance. The gyroid structure exhibits the best catalytic performance of driving 500 mA cm−2 at a low overpotential of 228 mV and 1500 mA cm−2 at 325 mV, as it maximizes the efficient bubble removal from the electrode surface, which offers the great potential for high current density water splitting.
在这项工作中,我们报道了一系列单片三维打印镍钼合金电极,可在高电流密度(1500 mA cm-2)下高效分水,且稳定性极佳,这为将 HER 用镍钼催化剂扩大到工业用途提供了解决方案。通过调整原子成分和热处理程序,实现了所有可能的镍钼金属/合金相,并通过实验和模拟对其进行了研究,结果表明最佳镍钼相的性能最佳。密度泛函理论(DFT)计算表明,NiMo 相的 H2O 离解能最低,这进一步解释了 NiMo 的优异性能。此外,通过控制热处理调节微孔,表明 1100 °C 烧结样品具有最佳催化性能,这归功于其较高的电化学活性表面积(ECSA)。最后,通过三维打印实现了四种不同的宏观结构,它们进一步提高了催化性能。陀螺结构的催化性能最佳,在 228 mV 的低过电位下可驱动 500 mA cm-2,在 325 mV 下可驱动 1500 mA cm-2,因为它能最大限度地从电极表面有效去除气泡,为高电流密度水分离提供了巨大潜力。
期刊介绍:
Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.