A Theoretical Inquest of Atomically Injected Ni-Atom over Graphene and Analogous Substrates for Hydrogen Evolution Reaction

IF 2.7 4区 化学 Q3 CHEMISTRY, PHYSICAL Electrocatalysis Pub Date : 2024-08-03 DOI:10.1007/s12678-024-00884-9
Hemang P. Tanna, Prafulla K. Jha
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Abstract

A rational catalyst for electrocatalytic hydrogen evolution reaction (HER) is a long-standing challenge that researchers are confronted with. In view of this, tiny particles of transition metals (TMs) spread over a substrate acting as an active site for the reaction, scientifically known as single-atom catalysts is seen as an efficacious way for designing an efficient catalyst. Herein, we comprehensively investigated catalytic activity of Ni-atoms spread over various kinds of two-dimensional (2D) substrates like graphene, AlC, AlN, h-BN, BeO, and MgO (Ni@2D) towards HER using density functional theory calculations. All the considered 2D substrates have various inequivalent anchoring sites like top, hollow, bridge, and vacancy sites for Ni-atoms. So, there are total 34 anchoring sites, and we computed binding energy (E\(_b\)) of Ni-atom over all the sites. Having large number of configurations, we first applied a screener on stability of Ni@2D and only considered those configurations for which the E\(_b\) value is <\(-\)3.00 eV for further calculations. Out of 34, 17 configurations were falling in this range. Further, we computed the differential Gibbs free energy of H-adsorption (\(\Delta\)G\(_H\)) and generated volcano plot between \(\Delta\)G\(_H\) and exchange current density (\(i_0\)) as a prime indicators of HER activity. Then, we screened these configurations based on \(\Delta\)G\(_H\) values that \(|\Delta\)G\(_H|\) \(\le\) to 0.5 eV, and out of 17, 10 systems were falling in this region. At last, we examined complete reaction profile of HER via Volmer-Heyrovsky (VH) and Volmer-Tafel (VT) mechanisms over the remaining 10 configurations, and the lowest activation energy for HER are 0.12 eV and 0.21 eV for Ni@AlN and 0.28 eV and 0.36 eV for Ni@h-BN via VT and VH mechanism, respectively. Our findings show Ni@AlN and Ni@h-BN could be a non-noble TM candidate for eco-operational HER catalyst.

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石墨烯和类似基底上原子注入镍原子进行氢气进化反应的理论探索
摘要 为电催化氢进化反应(HER)寻找合理的催化剂是研究人员长期面临的挑战。有鉴于此,将过渡金属(TMs)的微小颗粒铺在基底上作为反应的活性位点(科学上称为单原子催化剂)被认为是设计高效催化剂的有效方法。在此,我们利用密度泛函理论计算全面研究了分布在石墨烯、AlC、AlN、h-BN、BeO 和 MgO 等各种二维(2D)基底上的镍原子(Ni@2D)对 HER 的催化活性。所有考虑的二维基底都有各种不等价的锚定位点,如顶部、空心、桥和镍原子的空缺位点。因此,总共有 34 个锚定位点,我们计算了所有位点上镍原子的结合能(E (_b ()))。由于存在大量的构型,我们首先对 Ni@2D 的稳定性进行了筛选,只考虑那些 E (_b\ )值为 3.00 eV 的构型进行进一步的计算。在 34 个构型中,有 17 个构型属于这一范围。此外,我们还计算了H-吸附的差分吉布斯自由能(\(\Delta\)G\(_H\)),并生成了\(\Delta\)G\(_H\)和交换电流密度(\(i_0\))之间的火山图,作为HER活性的主要指标。然后,我们根据 \(\Delta\)G\(_H\) \(\le\) 到 0.5 eV 的值(\(|\Delta\)G\(_H|\) \(\le\))对这些配置进行了筛选,在 17 个系统中,有 10 个系统属于这一区域。最后,我们通过Volmer-Heyrovsky(VH)和Volmer-Tafel(VT)机制考察了其余10种构型的HER的完整反应曲线,通过VT和VH机制,Ni@AlN的HER最低活化能分别为0.12 eV和0.21 eV,Ni@h-BN的最低活化能分别为0.28 eV和0.36 eV。我们的研究结果表明,Ni@AlN和Ni@h-BN可以作为生态操作型HER催化剂的非贵金属候选材料。
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来源期刊
Electrocatalysis
Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY
CiteScore
4.80
自引率
6.50%
发文量
93
审稿时长
>12 weeks
期刊介绍: Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.
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