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Ir Doping Modulates the Electronic Structure of Flower

花匠小妙招
2024-12-03 04:32

Electrolysis of water to produce hydrogen is an efficient, clean, and environmentally friendly hydrogen production method with unlimited development prospects. However, its overall efficiency is hampered by the slow oxygen evolution reaction (OER) with complex electron transfer processes. Therefore, designing efficient and low-cost OER catalysts is the key to solving this problem. In this paper, Ir-doped Co2P/Fe2P (abbreviated as Ir-CoFeP/NF) was grown on nickel foam through the strategies of low amount noble-metal doping and mild phosphating. Phosphide derived from a floral metal–organic framework (MOF) exhibits regular three-dimensional (3D) morphology and large active area, avoiding the stacking of active sites. The addition of Ir can effectively adjust the electronic structure, change the position of the d-band center, and increase active sites, thus enhancing the catalytic activity. Hence, the optimized catalyst exhibits unexpected electrocatalytic OER activity with an ideal overpotential of 213 mV at 10 mA cm–2, as well as a low Tafel slope of 40.63 mV dec–1. Coupling with Pt/C for overall water splitting (OWS), the entire device only needs an ultralow cell voltage of 1.50 V to achieve a current density of 10 mA cm–2. Besides, the OWS can be maintained for more than 70 h. This study demonstrates the superiority of Ir-doped phosphide in accelerating water oxidation.

中文翻译：

Ir 掺杂调节花形磷化物的电子结构以进行水氧化

电解水制氢是一种高效、清洁、环保的制氢方法，具有无限的发展前景。然而，其整体效率受到具有复杂电子转移过程的缓慢析氧反应（OER）的阻碍。因此，设计高效、低成本的 OER 催化剂是解决这个问题的关键。本文通过低量贵金属掺杂和温和磷化的策略，在泡沫镍上生长了 Ir 掺杂的 Co2P/Fe2P（简称 Ir-CoFeP/NF）。源自花卉金属-有机框架（MOF）的磷化物表现出规则的三维（3D）形态和较大的活性面积，避免了活性位点的堆叠。Ir 的加入可以有效地调整电子结构，改变 d 波段中心的位置，增加活性位点，从而增强催化活性。因此，优化的催化剂表现出意想不到的电催化 OER 活性，在 10 mA cm–2 时的理想过电位为 213 mV，以及 40.63 mV dec–1 的低塔菲尔斜率。与 Pt/C 耦合以实现整体水分解（OWS），整个器件只需要 1.50 V 的超低电池电压即可实现 10 mA cm–2 的电流密度。此外，OWS 可以保持 70 小时以上。本研究证明了 Ir 掺杂磷化物在加速水氧化方面的优越性。