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
Received date: 2022-06-28
Revised date: 2022-07-21
Online published: 2022-08-23
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, Mo2C和CoO/Fe3O4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 mA·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。
周澳 , 郭伟健 , 王月青 , 张进涛 . 焦耳热快速合成双功能电催化剂用于高效水分解[J]. 电化学, 2022 , 28(9) : 2214007 . DOI: 10.13208/j.electrochem.2214007
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 active 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.
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