氮掺杂碳纳米管上钴和钌位点之间的电子通信促进碱性析氢反应
Electronic Communication between Co and Ru Sites Decorated on Nitrogen-Doped Carbon Nanotubes Boosting the Alkaline Hydrogen Evolution Reaction
# These authors contribute equally to this work
Received date: 2024-03-08
Revised date: 2024-04-09
Accepted date: 2024-04-23
Online published: 2024-04-23
碱性电解水析氢反应作为获取绿色氢能源的重要途径具有广泛的研究意义和应用价值,但其缓慢的电极反应动力学及较高的过电位需要高效稳定的催化剂来加速反应过程。目前商用的铂(Pt)基催化剂因高昂的成本限制了其规模化应用。设计高效、低过电位的非 Pt 电催化剂仍然是一个重大挑战。钌(Ru)基催化剂因具有类 Pt 的活性氢结合能而受到广泛关注。本文以富勒醇和三聚氰胺为基体原料,与氯化钴和氯化钌在 150 °C 水热反应 24 小时,随后在氩气/氢气(5%)混合气氛下 600 °C热解处理,成功在氮掺杂碳纳米管(N-CNTs)上修饰了钴钌(CoRu)纳米合金,制备了一种新型高效的 Co,Ru 双金属电催化剂。得益于 Co 和 Ru 位点之间的电子通信,所得 CoRu@N-CNTs 具有优异的电催化析氢反应活性。在 1 mol·L -1 氢氧化钾水溶液中达到 10 mA·cm -2 的电流密度,所需过电位仅为 19 mV,塔菲尔斜率为 26.19 mV·dec-1,优于基准 Pt/C 催化剂。本研究将为高效析氢电催化剂的设计与制造开辟一条新的道路,有力推动电解水制氢技术在能源存储与转化领域的应用推广,为我国“碳达峰与碳中和”战略目标的实施蓄势赋能。
高梦婷 , 卫莹 , 霍雪萌 , 朱文洁 , 刘箐箐 , 强晋源 , 刘婉婉 , 王颖 , 李旭 , 黄剑锋 , 冯永强 . 氮掺杂碳纳米管上钴和钌位点之间的电子通信促进碱性析氢反应[J]. 电化学, 2024 , 30(9) : 2403081 . DOI: 10.61558/2993-074X.3460
Designing highly efficient Pt-free electrocatalysts with low overpotential for an alkaline hydrogen evolution reaction (HER) remains a significant challenge. Here, a novel and efficient cobalt (Co), ruthenium (Ru) bimetallic electrocatalyst composed of CoRu nanoalloy decorated on the N-doped carbon nanotubes (CoRu@N-CNTs), was prepared by reacting fullerenol with melamine via hydrothermal treatment and followed by pyrolysis. Benefiting from the electronic communication between Co and Ru sites, the as-obtained CoRu@N-CNTs catalyst exhibited superior electrocatalytic HER activity. To deliver a current density of 10 mA·cm-2, it required an overpotential of merely 19 mV along with a Tafel slope of 26.19 mV·dec-1 in 1 mol·L-1 potassium hydroxide (KOH) solution, outperforming the benchmark Pt/C catalyst. The present work would pave a new way towards the design and construction of an efficient electrocatalyst for energy storage and conversion.
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