Co-1.4 Ni0.6P cocatalysts modified metallic carbon black/g-C3N4 nanosheet Schottky heterojunctions for active and durable photocatalytic H-2 production
Co-1.4 Ni0.6P cocatalysts modified metallic carbon black/g-C3N4 nanosheet Schottky heterojunctions for active and durable photocatalytic H-2 production
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Co-1.4 Ni0.6P助催化剂改性金属炭黑/g-C3N4纳米片肖特基异质结用于活性和持久的光催化H-2生产
DOI：
10.1016/j.apsusc.2018.10.033
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发表时间：
2019
影响因子：
6.7
通讯作者：
Li Xin
中科院分区：
文献类型：
--
作者：
Shen Rongchen;Liu Wei;Ren Doudou;Xie Jun;Li Xin
光生电子和空穴的有效分离和利用在促进光催化析氢反应（HER）中起着决定性作用。为了实现这一目标，我们设计了炭黑（CB）和Co1.4Ni0.6P作为双助催化剂共改性石墨氮化碳，以实现高效稳定的光催化HER。通过声化学负载和高温磷化合成了所得三元光催化剂。令人印象深刻的是，三元光催化剂的最大光催化产氢率可达405 μmolh−1g−1，分别是纯g-C3N4（0.5μmolh−1g−1）、g-C3N4-Co1.4Ni0.6P（195μmolh−1g−1）和g-C3N4-1%的810、2和1.7倍铂 分别为 (230 μmolh−1g−1)。通过测试分析，析氢性能的增强归因于金属CB和低成本Co1.4Ni0.6P助催化剂之间的协同效应。更有趣的是，Co1.4Ni0.6P助催化剂不仅可以减少光生电子和空穴的复合，还可以增强可见光区域的吸收和析氢动力学。此外，金属CB和g-C3N4纳米片之间形成肖特基异质结可以进一步加速光生电子的分离和转移。这项工作提供了一种简单易行的策略，可以使用低成本纳米碳材料和高活性金属磷化物合理设计高效光催化剂。
Efficient separation and utilization of photogenerated electrons as well as holes play decisive roles in boosting photocatalytic hydrogen evolution reaction (HER). To reach this goal, we designed carbon black (CB) and Co1.4Ni0.6P as dual cocatalysts co-modified graphitic carbon nitride for efficient and stable photocatalytic HER. This resulting ternary photocatalyst was synthesized by sonochemical loading and high-temperature phosphatizing. Impressively, the maximum photocatalytic hydrogen-production rate for the ternary photocatalysts could reach 405 μmolh−1g−1, which was 810, 2 and 1.7 times higher than those of pure g-C3N4(0.5μmolh−1g−1), g-C3N4-Co1.4Ni0.6P (195μmolh−1g−1) and g-C3N4-1% Pt (230 μmolh−1g−1), respectively. Through the test analysis, the enhanced hydrogen-evolution performance was attributed to the synergetic effect between the metallic CB and the low-cost Co1.4Ni0.6P cocatalyst. More interestingly, the Co1.4Ni0.6P cocatalyst could not only decrease the recombination of photogenerated electrons and holes, but also boost absorption in the visible region and the hydrogen-evolution kinetics. Furthermore, the formation of Schottky heterojunctions between metallic CB and g-C3N4nanosheets could further accelerate the separation and transfer of photogenerated electrons. This work provides a simple and facile strategy to rationally design highly efficient photocatalyst using low-cost nanocarbon materials and high-activity metal phosphide.