A highly efficient and durable carbon nanotube-based anode electrocatalyst for water electrolyzers
A highly efficient and durable carbon nanotube-based anode electrocatalyst for water electrolyzers
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DOI：
10.1039/c7ta01318c
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发表时间：
2017-06-07
影响因子：
11.9
通讯作者：
Nakashima, Naotoshi
中科院分区：
文献类型：
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作者：
Fujigaya, Tsuyohiko;Shi, Yilei;Nakashima, Naotoshi
在聚苯并咪唑（PBI）包裹的多壁碳纳米管（MWNTs）上均匀沉积了直径为1.1 ± 0.2 nm的铱（Ir）纳米颗粒，其中PBI能够有效地锚定Ir纳米颗粒。将Ir纳米颗粒电化学氧化以提供Ir氧化物（IrOx），并通过半电池测量作为析氧反应催化剂进行评价。该复合材料也被用作质子交换膜水电解槽（PEMWEs）的阳极电催化剂。结果表明，即使与其他最先进的Ir基催化剂相比，PBI包裹的MWNTs上的IrOx也表现出非常高的电催化质量活性和耐久性，而沉积在常规炭黑上的IrOx仅表现出较差的耐久性。
Iridium (Ir) nanoparticles with a uniform diameter of 1.1 +/- 0.2 nm were homogeneously deposited on multi-walled carbon nanotubes (MWNTs) wrapped by polybenzimidazole (PBI), in which PBI enables efficient anchoring of the Ir nanoparticles. The Ir nanoparticles were electrochemically oxidized to afford Ir oxide (IrOx) and evaluated as an oxygen evolution reaction catalyst by half-cell measurements. The composite was also used as an anode electrocatalyst for proton exchange membrane water electrolyzers (PEMWEs). It was revealed that the IrOx on the PBI-wrapped MWNTs exhibited a very high electrocatalytic mass activity and durability even compared to the other state-of-the-art Ir-based catalysts, while the IrOx deposited on conventional carbon black showed only a poor durability.