p-n tungsten oxide homojunctions for Vis-NIR light-enhanced electrocatalytic hydrogen evolution
p-n tungsten oxide homojunctions for Vis-NIR light-enhanced electrocatalytic hydrogen evolution
复制标题
用于可见光-近红外光增强电催化析氢的p-n氧化钨同质结
DOI：
10.1039/c9ta06589j
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发表时间：
2019-09-07
影响因子：
11.9
通讯作者：
Hao, Xiaopeng
中科院分区：
文献类型：
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作者：
Chang, Bin;Ai, Zizheng;Hao, Xiaopeng
基于能带工程理论，设计了一种金属氧化物p-n同质结，以克服光生载流子的复合和不适当的吸氢能。通过对氧空位的调节和磷的掺杂，成功地合成了一种新型的p-n氧化钨同质结。基于MXenes的协同效应，实现了可见光-近红外光催化析氢体系，其过电位为44 mV(10 mA cm~(-2))，Tafel斜率为41 mV DEC(-1)，比在黑暗中更有效，与贵金属催化剂(铂和铂/C)相当。此外，合成的样品具有明显的优势，在有光和无光照射下都可以长期稳定在24小时以上。P-n同质结的设计理念开启了利用光激活金属氧化物将催化与太阳能和电能相结合的前景。
Based on energy band engineering theory, a p-n homojunction of metal oxides was designed to overcome the recombination of photogenerated carriers and inappropriate hydrogen adsorption energy. A novel p-n tungsten oxide homojunction was successfully synthesized by tuning oxygen vacancies and phosphorus-doping. Based on the synergies of Mxenes, a Vis-NIR light-enhanced electrocatalytic hydrogen evolution system was accomplished with a small overpotential of 44 mV (at 10 mA cm(-2)) and a low Tafel slope of 41 mV dec(-1), which performed much more efficiently than in darkness and comparably to noble-metal catalysts (Pt and Pt/C). Moreover, the as-synthesized samples offered a distinct advantage of long-term stability for more than 24 h both with and without light irradiation. The design philosophy of p-n homojunctions opens a prospect of utilizing light-activated metal oxides to integrate catalysis with solar energy and electrical energy.