Removing Semiconductor-Cocatalyst Interfacial Electron Transfer Induced Bottleneck for Efficient Photocatalysis: A Case Study on Pt/CdS Photocatalyst

Removing Semiconductor-Cocatalyst Interfacial Electron Transfer Induced Bottleneck for Efficient Photocatalysis: A Case Study on Pt/CdS Photocatalyst
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消除半导体-助催化剂界面电子转移引起的高效光催化瓶颈:Pt/CdS 光催化剂案例研究

DOI:
10.1016/j.jcat.2022.03.014
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发表时间:
2022-03
影响因子:
7.3
通讯作者:
Jiazang Chen
Jiazang Chen
中科院分区:
化学1区
文献类型:
--
作者:
Zhijian Wang;Bingbao Mei;Jiazang Chen

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阳光驱动的光催化析氢是一种有前途的可持续清洁能源供应策略。然而,这种方法的局限性在于,即使在用有效的空穴萃取取代缓慢的析氧后,其速率也很低,因为非常高的势垒严重减缓了向助催化剂提供光生电子的速度。在这里,我们将半导体-助催化剂与具有适当功函数的金属连接起来。在我们演示的Pt/CdS光催化剂中,该措施降低了界面电子转移的势阱约800 meV。由此可见,含中间金属的光催化剂在光照(AM 1.5G, 100 mW/cm2)下的析氢速率为1.87 mmol dm−2h−1(37.4 mmol g−1h−1),当光照强度增加到940 mW/cm2(AM 1.5G)时,析氢速率线性增加到18.39 mmol dm−2h−1(367.8 mmol g−1h−1)。
Sunlight-driven photocatalytic hydrogen evolution represents a promising strategy to sustainable clean energy supply. This approach, however, is limited due to low rate even after replacing the sluggish oxygen evolution with efficient hole-extraction, because the very high barrier severely slows the supply of photogenerated electrons to the cocatalysts. Here, we bridge semiconductor-cocatalyst contact with metals that are of appropriate work function. This measure lowers the barrier for interfacial electron transfer by ∼800 meV in our demonstrated Pt/CdS photocatalyst. By this merit, the photocatalyst with intermediate metal delivers an unprecedented hydrogen evolution rate of 1.87 mmol dm−2h−1(37.4 mmol g−1h−1) under sunlight (AM 1.5G, 100 mW/cm2) and linearly increases to 18.39 mmol dm−2h−1(367.8 mmol g−1h−1) by intensifying the illumination to 940 mW/cm2(AM 1.5G).
具有独特界面微结构的 MoO2-C/CdS 三元异质结上高效可见光驱动的光催化 H-2 析出
DOI: 10.1016/j.apcatb.2019.118153
发表时间: 2019
期刊: Applied Catalysis B: Environmental
影响因子: --
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影响因子: 15
作者:
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