Huiyu Sun, Shudi Yu, Jiongting Yin, Jie Li, Jun Yu, Tianpeng Liu, Wanyu Liang, Nannan Zhang, Yangping Zhang, Changqing Ye, Mengyun Hu, Yukou Du
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引用次数: 0
Abstract
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.
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,由于氧进化反应(OER)速度较慢,电子传递过程复杂,影响了其整体效率。因此,设计高效、低成本的氧进化反应催化剂是解决这一问题的关键。本文通过低量贵金属掺杂和温和磷化的策略,在泡沫镍上生长了掺杂 Ir 的 Co2P/Fe2P(简称 Ir-CoFeP/NF)。由花金属有机框架(MOF)衍生的磷化物具有规则的三维(3D)形态和较大的活性面积,避免了活性位点的堆叠。铱的加入可以有效地调整电子结构,改变 d 带中心的位置,增加活性位点,从而提高催化活性。因此,优化后的催化剂表现出了意想不到的电催化 OER 活性,在 10 mA cm-2 的条件下,理想过电位为 213 mV,Tafel 斜率低至 40.63 mV dec-1。与用于整体水分离(OWS)的 Pt/C 相耦合,整个装置只需要 1.50 V 的超低电池电压就能达到 10 mA cm-2 的电流密度。这项研究证明了掺铱磷化物在加速水氧化方面的优越性。
期刊介绍:
Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.