焦耳热快速合成双功能电催化剂用于高效水分解

The Rapid Preparation of Efficient MoFeCo-Based Bifunctional Electrocatalysts via Joule Heating for Overall Water Splitting

电解水是有效的产氢方式之一,开发具有高催化活性的电极材料是当前电解水的研究热点,但仍面临诸多挑战。本研究报告了一种通过焦耳热技术快速制备多金属异质结构,并将其用作电解水的双功能电催化剂,展现出优异的电解水催化活性。通过焦耳热处理三种金属前驱涂覆的碳布,MoC和CoO/FeO异质结构形成。当其用作析氢(HER)和析氧(OER)的双功能催化剂时,仅需121 mV和268 mV的过电位,可以实现10 m A·cm^(-2)的电流密度。当用于两电极电解水时,MoC/FeO/CoO/CC作为阳极和阴极催化剂表现出优异的电催化性能和长期稳定性,仅需1.69 V即可实现10 mA·cm^(-2)的电流密度,并且展现出25小时的稳定性。本研究通过简单、快速的焦耳热技术实现了双金属/多金属异质结构的构筑,并应用于高效水电解,为合理设计多金属异质结构提供指导。

Water electrolysis is an available way to obtain green hydrogen.The development of highly efficient electrocatalysts is a current research hotspot for water splitting,but it remains challenging.Herein,we demonstrate the synthesis of a robust bifunctional multi-metal electrocatalysts toward water splitting via the rapid Joule-heating conversion of metal precursors.The composition and morphology were well regulated via altering the ratio of metal precursors.In particular,the trimetal MoC/FeO/CoO/carbon cloth(CC)electrode revealed the outstanding bifunctional electrocatalytic performance due to the unique composition and large electrochemical ac tive surface area.Typically,the MoC/FeO/CoO/CC catalyst needed low overpotentials of 121 and 268 mV to reach 10 mA·cm^(-2)toward HER and OER in 1 mol·L^(-1)KOH solution,respectively.When used as both cathode and anode,a small potential of 1.69 V was required to achieve 10 mA·cm^(-2)for overall water splitting and an impressive stability for 25 h was observed.This facile and rapid Joule heating strategy offers guideline for rational manufacture of bimetal or multi-metal electrocatalysts toward diverse application.