Jiacong Wu,Chunmei Li,Wenli Zhang,Juan Han,Lei Wang,Shuhao Wang,Yun Wang
It is a huge challenge for exploiting new photocatalysts with low-cost cocatalysts in place of precious metals to realize high-efficiency H 2 production from water. Herein, a new photocatalyst with a high H 2 production activity is prepared via modification of bimetallic manganese cobalt phosphide (Mn 0.67 Co 1.33 P) nanodots on graphitic carbon nitride (g-C 3 N 4 ). Moreover, the largest H 2 production rate of 113.1 μmol h −1 is obtained over the Mn 0.67 Co 1.33 P/g-C 3 N 4 -5 sample, which is about 2.75 times than that of Pt/g-C 3 N 4 -5 (41.2 μmol h −1 ). The high-performance H 2 production suggests page a page down that the modification effect of Mn 0.67 Co 1.33 P nanodots improves the visible harvest ability and separation efficiency of charge carriers. A typical example to improve the photocatalytic H 2 production performance by fabricating heterostructures using bimetallic phosphide to modify graphitic carbon nitride is provided.
Yanyan Wang,Xue Yu,Gen Liu,Xiaodong Zhu,Rui Xu,Mei Ji,Yanqing Ma,Lei Ma
Proton exchange membrane water electrolysis (PEMWE) is known as an effective and environmental-friendly method for hydrogen production. However, the process is hindered by the necessity of large loading of high-priced noble metals in the conventional approaches. To resolve this problem, a highly efficient Nafion-based catalyst and proton exchange system are developed, which only need ultralow platinum loading by direct e-beam evaporation deposition. Scanning electron microscopy is performed before and after the deposition, which reveals a very smooth morphology. By assembling the PEMWE device with above-mentioned cathode and conventional iridium black anode, the current density reaches 500 mA cm −2 with a platinum loading of only 0.00379 mg cm −2 at 1.64 V under 80 °C. A mass activity of ≈132 A mg −1 is achieved, which is one order of magnitude higher than previously reported results. Moreover, powered by a commercial silicon solar cell, it realizes a solar-to-hydrogen conversion efficiency up to 8.26%. This work opens up an avenue of fabricating PEMWE with an ultralow catalyst loading, which may have enormous potential for future industrial scale applications.
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