由 Mo-Co MOFs 衍生的多孔 Co3Mo3N/N 掺杂碳电催化剂用于电化学氢进化反应†。

IF 2.7 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
P. Mohana, R. Yuvakkumar, G. Ravi, A. Arun, S. Arun Metha and P. Dhanasekaran
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引用次数: 0

摘要

非贵金属-有机骨架(MOF)衍生的双金属过渡金属氮化物(TMN)析氢反应电催化剂的开发是一项具有挑战性的任务。以前,pt基电催化剂因其优异的电催化活性被认为是HER的潜在候选材料。然而,基于双金属和多孔碳协同作用的复合电催化剂表现出更强的导电性和催化活性。本文以Mo-Co MOFs为原料,在不同温度(700、800、900℃)下共沉淀法和热解法制备了多孔Co3Mo3N/氮掺杂碳(NC)复合电催化剂,样品记为CMN700、CMN800、CMN900。在这项研究中,CMN900催化剂表现出多孔纳米颗粒的形态,并改善了电子/质量传递,从而为HER产生了丰富的活性位点。在1 M碱性氢氧化钾(KOH)电解质溶液中,研究了优化后的电催化剂的电化学性质。合成的Co3Mo3N/NC电催化剂需要125 mV的低过电位才能获得10 mA cm−2的低电流密度和98.49 mV dec−1的小Tafel斜率。氮掺杂碳中Co和Mo位点的协同性能获得了良好的电化学活性表面积值(92.5 cm2)和电荷转移阻值(2.20 Ω)。此外,制备的电催化剂在低电流密度下长时间的耐用性通过计时电流分析得到验证,表明其具有良好的稳定性和作为可持续氢能源生产电催化剂的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A porous Co3Mo3N/N-doped carbon electrocatalyst derived from Mo–Co MOFs for the electrochemical hydrogen evolution reaction†

A porous Co3Mo3N/N-doped carbon electrocatalyst derived from Mo–Co MOFs for the electrochemical hydrogen evolution reaction†

The development of non-noble metal–organic framework (MOF)-derived bimetallic transition metal nitride (TMN) electrocatalysts for the hydrogen evolution reaction (HER) is a challenging task. Previously, Pt-based electrocatalysts were considered potential noble candidates for the HER owing to their excellent electrocatalytic activity. However, composite electrocatalysts based on the synergy of bimetals and porous carbon have demonstrated the enhanced electrical conductivity and catalytic activity. Herein, a porous Co3Mo3N/nitrogen-doped carbon (NC) composite electrocatalyst derived from Mo–Co MOFs was prepared via co-precipitation and pyrolysis at different temperatures (700, 800 and 900 °C), and the samples are denoted as CMN700, CMN800, and CMN900. In this study, the CMN900 catalyst exhibited a porous nanoparticle morphology and improved electron/mass transport, leading to the generation of abundant reactive active sites for the HER. Furthermore, the electrochemical nature of the optimized electrocatalyst was studied using 1 M alkaline potassium hydroxide (KOH) electrolyte solution. The synthesized Co3Mo3N/NC electrocatalyst required a low overpotential of 125 mV to attain a low current density of 10 mA cm−2 and a small Tafel slope of 98.49 mV dec−1. The synergistic performance of the Co and Mo sites in nitrogen-doped carbon achieved good electrochemical active surface area value (92.5 cm2) and charge transfer resistance value (2.20 Ω). Moreover, the durability of the prepared electrocatalyst was verified by chronoamperometry analysis at the low current density for a prolonged duration, demonstrating its good stability and suitability as an electrocatalyst for sustainable hydrogen energy production.

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来源期刊
New Journal of Chemistry
New Journal of Chemistry 化学-化学综合
CiteScore
5.30
自引率
6.10%
发文量
1832
审稿时长
2 months
期刊介绍: A journal for new directions in chemistry
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