Wensheng Zhang , Xu Chen , Jinyu Zhao , Lin Niu , Guipeng Wang , Xiaomin Wang
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引用次数: 0
Abstract
The potential of hydrogen production via water splitting technology makes it urgent to develop low-cost and highly active bifunctional catalysts for hydrogen and oxygen evolution reactions (HER/OER). In this study, a low platinum (Pt) bimetallic phosphide heterostructure (Pt-NiFe-P/NF), derived from three-dimensional NiFe metal–organic framework (NiFe-MOF) nanorods on nickel foam (NF), was developed using a two-step hydrothermal and phosphorization process. The nickel-iron phosphide nanorod array heterostructure boasts a large surface area with numerous active sites, which enhances charge and substance transfer. The integration of metallic Pt with NiFe-P heterostructures subtly adjusts the electronic redistribution between them, thereby improving the kinetics of water splitting. Consequently, the Pt-NiFe-P/NF catalyst demonstrated exceptional HER and OER performance in a 1 M KOH solution, with overpotentials of 97 and 266 mV at 100 mA cm−2, respectively. Remarkably, an electrolyzer utilizing this catalyst requires just a 1.65 V potential to achieve a current density of 100 mA cm−2, exceeding the capabilities of conventional Pt/C||RuO2 systems, which require 2.10 V and outperforming many advanced electrochemical water splitting catalysts currently in use.
通过水分离技术制氢的潜力使得开发用于氢氧进化反应(HER/OER)的低成本、高活性双功能催化剂成为当务之急。本研究采用水热法和磷化法两步工艺,开发了一种低铂(Pt)双金属磷化异质结构(Pt-NiFe-P/NF),该异质结构源自泡沫镍(NF)上的三维镍铁金属有机框架(NiFe-MOF)纳米棒。这种镍-磷化铁纳米棒阵列异质结构具有较大的表面积和众多的活性位点,从而增强了电荷和物质的转移。金属铂与 NiFe-P 异质结构的结合巧妙地调整了它们之间的电子再分配,从而改善了水分离的动力学。因此,Pt-NiFe-P/NF 催化剂在 1 M KOH 溶液中表现出卓越的 HER 和 OER 性能,在 100 mA cm-2 条件下的过电位分别为 97 和 266 mV。值得注意的是,使用这种催化剂的电解槽只需要 1.65 V 的电位就能达到 100 mA cm-2 的电流密度,超过了需要 2.10 V 电位的传统 Pt/C||RuO2 系统,也优于目前使用的许多先进电化学水分离催化剂。
期刊介绍:
A multidisciplinary journal focusing on cutting edge research across all fundamental science and technological aspects of catalysis.
Editor-in-chief: Bert Weckhuysen
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