Shujie Liu, Zhiguo Zhang, Kamran Dastafkan, Yan Shen, Chuan Zhao, Mingkui Wang
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引用次数: 0
Abstract
Active and stable electrocatalysts are essential for hydrogen production from alkaline water electrolysis. However, precisely controlling the interaction between electrocatalysts and reaction intermediates (H2O*, H*, and *OH) remains challenging. Here, we demonstrate an yttrium-doped NiMo-MoO2 heterogenous electrocatalyst that efficiently promotes water dissociation and accelerates the intermediate adsorption/desorption dynamics in alkaline electrolytes. Introducing yttrium into the NiMo/MoO2 heterostructure induces lattice expansion and optimizes the d-band center of NiMo alloy component, enhancing water dissociation and H* desorption. Yttrium doping also increases the concentration of oxygen vacancies in MoO2−x, which in turn accelerates the charge kinetics and the swift evacuation of *OH intermediates from the active sites. Consequently, the Y-NiMo/MoO2−x heterostructure exhibits notable performance by requiring only 189 and 220 mV overpotentials to achieve current density of 2.0 A cm−2 in alkaline water and seawater, respectively. This work provides a strategy to modulate heterostructure catalysts for scalable, economically viable hydrogen production from low-quality waters.
活性稳定的电催化剂是碱水电解制氢的必要条件。然而,精确控制电催化剂和反应中间体(H2O*, H*和*OH)之间的相互作用仍然具有挑战性。在这里,我们展示了一种钇掺杂的NiMo-MoO2多相电催化剂,它有效地促进了水的解离,并加速了碱性电解质中的中间吸附/解吸动力学。在NiMo/MoO2异质结构中引入钇可诱导晶格膨胀,优化NiMo合金组分的d带中心,促进水解离和H*脱附。钇的掺杂也增加了MoO2−x中氧空位的浓度,从而加速了电荷动力学和*OH中间体从活性位点的快速排出。因此,Y-NiMo/MoO2−x异质结构表现出显著的性能,在碱性水和海水中分别只需要189和220 mV过电位就能达到2.0 A cm−2的电流密度。这项工作提供了一种策略来调节异质结构催化剂,以实现可扩展的、经济上可行的低质量水制氢。
期刊介绍:
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.