Highly Efficient Electrocatalytic Hydrogen Production over Carbon Nanotubes Loaded with Platinum Nanoparticles Using Solution Processing
Highly Efficient Electrocatalytic Hydrogen Production over Carbon Nanotubes Loaded with Platinum Nanoparticles Using Solution Processing
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DOI：
10.1002/admi.202300094
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发表时间：
2023-04
影响因子：
5.4
通讯作者：
Osama R. M. Metawea;Miyuki Nara;Takeharu Murakami;Satoshi Wada;K. Fujii;Yoshihiro Ito;Masuki Kawamoto
中科院分区：
文献类型：
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作者：
Osama R. M. Metawea;Miyuki Nara;Takeharu Murakami;Satoshi Wada;K. Fujii;Yoshihiro Ito;Masuki Kawamoto
质子交换膜（PEM）电解槽用于通过水电解生产氢气（H2）。用于该方法的商业阴极电催化剂通常是机械混合的碳载铂（Pt/C）。然而，铂（Pt）的聚集使得催化剂的高负载变得困难。因此，需要一种用于Pt和碳材料的均匀组合的方法。在此，报道了使用新开发的悬浮法负载有铂纳米颗粒（PtNP）的高效单壁碳纳米管（SWCNT）阴极H2-生产电催化剂的第一个实例。将与水溶性硫醇官能化聚合物搭接的SWCNT与PtNP在水中组合产生PtNP缀合的SWCNT悬浮液。该电催化剂在10 mA cm-2的电流密度下对0.5 M硫酸中的H2析出表现出47 mV的低过电位。使用最佳制备的电催化剂制备的PEM电解槽，负载量为15 µgPt cm−2，显示出27 200 A gPt−1的高质量活性，是负载量为2.8 mgPt cm−2（324 A gPt−1）的Pt/C的80倍。此外，PEM电解槽以97%的法拉第效率生产H2，并在100 mA cm−2下稳定运行150 h。
Proton exchange membrane (PEM) electrolyzers are used for hydrogen (H2) production by water electrolysis. The commercial cathodic electrocatalyst for this process is typically mechanically mixed platinum on carbon (Pt/C). However, aggregation of the platinum (Pt) makes high loading of the catalyst difficult. Therefore, a method for the homogeneous combination of Pt and carbon materials is required. Herein, the first example of a highly efficient single‐walled carbon nanotube (SWCNT) cathodic H2‐production electrocatalyst that is loaded with platinum nanoparticles (PtNPs) using a newly developed suspension method is reported. Combining SWCNTs lapped with a water‐soluble, thiol‐functionalized polymer with PtNPs in water yields a PtNP‐conjugated SWCNT suspension. The electrocatalyst exhibits a low overpotential of 47 mV at a current density of 10 mA cm−2 toward H2 evolution in 0.5 m sulfuric acid. A PEM electrolyzer fabricated using the optimally prepared electrocatalyst with the low loading of 15 µgPt cm−2 shows a high mass activity of 27 200 A gPt−1, which is 80 times that of Pt/C with a loading amount of 2.8 mgPt cm−2 (324 A gPt−1). In addition, the PEM electrolyzer produces H2 at a Faradaic efficiency of 97% and operates stably for 150 h at 100 mA cm−2.