Black phosphorous dots phosphatized bio-based carbon nanofibers/bimetallic organic framework as catalysts for oxygen evolution reaction

过电位 析氧 电催化剂 双金属片 塔菲尔方程 催化作用 分解水 化学工程 电解质 材料科学 碳纳米纤维 电化学 无机化学 化学 电极 物理化学 光催化 有机化学 工程类
作者
Miao‐miao He,Dan Wang,Hiroshi Shiigi,Changhai Liu,Wenchang Wang,Xueling Shan,Zhidong Chen
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:47 (39): 17194-17203 被引量:6
标识
DOI:10.1016/j.ijhydene.2022.01.228
摘要

As a multi-step and more complex half-cell reaction than the hydrogen reverse evolution reaction (HER), the oxygen evolution reaction (OER) always requires a higher overpotential than HER. In order to minimize the associated energy loss as an overpotential, these electrochemical half-reactions of water splitting should be catalyzed by suitable materials. Due to the abundant exposed surface area and extensive active edge sites, black phosphorous quantum dots (BP QDs) have shown great potential in OER. Here, BP QDs was introduced to incorporate with bio-based carbon nanofibers (CNF) and Co–Ni bimetallic organic framework (CoNiMOF), preparing a novel catalyst for oxygen evolution reaction (OER) by a facile one-pot reaction (Scheme 1). The unique structures and greater BET surface areas of CoNiMOF-BP QDs/CNF could possibly supply a larger electrocatalytic surface, expose further active sites. The obtained CoNiMOF-BP QDs/CNF possesses excellent electrocatalytic activity in alkaline electrolyte (1 M KOH) with a low overpotential of 281 mV at 10 mA cm−2 and a low Tafel slope of 111.9 mV dec−1. The CoNiMOF-BP QDs/CNF can remain stable for 25,000 s under alkaline electrolyte, showing excellent stability. The increase of electrocatalyst activity is mainly attributed to the synergistic effect of excellent conductivity and enriched active sites arising from BP QDs. This work not only provides an effective strategy for the development of bimetallic MOFs derived electrocatalysts, but also puts forward a new insight for the application of BP QDs in water splitting.
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