合并激活碳化瓦纳与富含电子的碳站点,以实现高效的pH-通用演变反应
Yanan Zheng1, Yiwei Mou1, Yanwei Wang1
1The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City 400044, PR China.
Journal of colloid and interface science
|November 23, 2023
概括
用添加的碳化物纳米花 (Al-VC@C/NF) 为高效的进化反应 (HER) 合成. 这种新型催化剂在酸性和性条件下表现出色,超过其他非贵金属催化剂.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 碳化瓦纳 (VC) 由于其类似的特性和丰富性,显示出作为进化反应 (HER) 催化剂的前景.
- 目前的VC催化剂的性能不足与不利的中间相互作用有关.
研究的目的:
- 开发一种基于非过渡金属化碳酸的新型高效HER催化剂.
- 研究兴奋剂对VC的催化活性和机制的影响.
主要方法:
- 化学蒸汽碳化NH4VO3与控制的CH4到Ar流量比.
- 在泡上制备Al-doped VC纳米花与碳混合物 (Al-VC@C/NF).
- 在0.5M H2SO4和1M KOH中进行电化学表征,包括超电位和Tafel斜率测量.
- 理论计算 (DFT) 阐明了兴奋剂机制.
主要成果:
- Al-VC@C/NF在10mA cm-2.0下显示了58mV (酸性) 和97mV (性) 的低超电位.
- 催化剂表现出极好的HER性能,超过现有的非贵金属VC催化剂.
- 观察到小的Tafel斜率 (45mV dec-1酸性,73mV dec-1性) 和优越的稳定性.
- 理论计算证实,胺兴奋剂产生了富含电子的碳位点,降低了HER能量屏障.
结论:
- 化VC@C/NF是一种在酸性和性介质中对HER的高效和稳定的电催化剂.
- 非过渡金属兴奋剂是一种有效的策略,可以增强基于的碳材料的催化活性.
- 这项工作为设计先进的HER催化剂提供了一种新方法.
更多相关视频
相关概念视频
Acid Halides to Alcohols: LiAlH4 Reduction
2.8K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.8K
Reduction of Alkenes: Catalytic Hydrogenation
12.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.1K
Polyprotic Acids
29.2K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.2K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.6K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.6K
Carboxylic Acids to Primary Alcohols: Hydride Reduction
2.9K
Carboxylic acids, upon reaction with strong reducing agents such as lithium aluminum hydride followed by hydrolysis, undergo reduction to form primary alcohols.
2.9K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
1.8K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.8K


