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首页> 外文期刊>RSC Advances >Efficient visible-light photocatalytic H2 evolution over metal-free g-C3N4 co-modified with robust acetylene black and Ni(OH)2 as dual co-catalysts
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Efficient visible-light photocatalytic H2 evolution over metal-free g-C3N4 co-modified with robust acetylene black and Ni(OH)2 as dual co-catalysts

机译：高效的可见光光催化H2在无金属G-C3N4上的进化，用稳健的乙炔黑和Ni（OH）2作为双助催化剂

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In this work, a novel g-C _(3) N _(4) /acetylene black (AB)/Ni(OH) _(2) ternary composite photocatalyst with dual robust electron co-catalysts was successfully synthetized using a facile two-step strategy: ultrasonic dispersion treatment and a subsequent precipitation process. The photocatalytic H _(2) -production activity over the composite photocatalyst was also evaluated using an aqueous solution containing triethanolamine under visible light ( λ ≥ 420 nm). For the first time, it was revealed that the robust AB can be utilized as a co-catalyst to significantly enhance the photocatalytic H _(2) -evolution activity of g-C _(3) N _(4) . The results also demonstrated that the ternary g-C _(3) N _(4) /AB/Ni(OH) _(2) nanocomposite exhibited enhanced photocatalytic H _(2) -evolution activity as compared to bulk g-C _(3) N _(4) and binary hybrids. The g-C _(3) N _(4) –0.5% AB–1.0% Ni(OH) _(2) (weight ratio) composite shows the highest H _(2) evolution rate of 240 μmol g ~(?1) h ~(?1) under visible light irradiation, which is 320, 100 and 3.31 times higher than that of pure g-C _(3) N _(4) , g-C _(3) N _(4) –0.5% AB and g-C _(3) N _(4) –1.0% Ni(OH) _(2) , respectively. It is believed that the excellent synergetic effect between the robust AB and Ni(OH) _(2) as dual electron co-catalysts on the surface of g-C _(3) N _(4) can achieve the effectively promoted separation of photo-generated electron–hole pairs and enhance the following H _(2) -evolution kinetics, thus resulting in a significant enhancement of the photocatalytic H _(2) evolution activity over g-C _(3) N _(4) . It is expected that the combination of nano-carbons such as AB and other earth-abundant co-catalysts can become a general strategy to improve the H _(2) -evolution activity over various kinds of conventional semiconductors.
机译：在这项工作中，使用舒适的两步成功合成了一种新的GC _（3）N _（4）/乙炔黑（AB）/ Ni（OH）_（2）三元复合光催化剂，使用双重鲁棒电子助催化剂成功合成策略：超声波分散处理及随后的沉淀过程。还使用在可见光下（λ≥420nm）下的含有三乙醇胺的水溶液评估复合光催化剂上的光催化H_（2）的研磨活性。首先，揭示了稳健的AB可以用作助催化剂，以显着增强G-C _（3）N _（4）的光催化H _（2）evolce活性。结果还证明，与散装GC _（3）N相比，三元GC _（3）N _（4）/ AB / Ni（OH）α/ AB / Ni（OH）_（2）纳米复合材料表现出增强的光催化H _（2） - 易活性_（4）和二进制混合动力车。 GC _（3）N _（4）-0.5％AB-1.0％Ni（OH）_（2）（重量比）复合材料显示240μmolg〜（α1）的最高H _（2）进化率在可见光照射下的H〜（α1），比纯GC _（3）N _（4），GC _（3）N _（4）-0.5％ab和320,100和3.31倍。 GC _（3）N _（4）-1.0％Ni（OH）_（2）。据信鲁棒AB和Ni（OH）_（2）之间的优异的协同作用为GC _（3）N _（4）表面上的双电子助催化剂可以实现有效促进的光分离 - 产生的电子空穴对并增强以下H _（2） - evolution动力学，从而显着提高了GC _（3）N _（4）的光催化H _（2）进化活性。预期，纳米碳如AB和其他地球富力催化剂的组合可以成为改善各种常规半导体上的H _（2）evolutive活性的一般策略。

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