Tungsten carbide (WC) is a widely used engineering material which is usually prepared at high temperature. A new mechanism for synthesizing nanoscaled WC at ultralow temperature has been discovered. This discovery opens a novel route to synthesize valuable WC and other carbides at a cost-efficient way. The novel formation mechanism is based on an ion-exchange resin as carbon source to locally anchor the W and Fe species. As an intermediate, FeWO4 can be formed at lower temperature, which can be directly converted into WC along with the carbonization of resin. The size of WC can be less than 2 nm. The catalyst made with Pt nanoparticles supported on nanosized WC-GC (WC-graphitized carbon) shows enhanced electrocatalytic activity for oxygen reduction reaction. The result also indicates that the Pt nanoparticles deposited on WC-GC are dominated by Pt (111) plane and shows a mass activity of 257.7 mA mg−1Pt@0.9 V.
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机译：碳化钨（WC）是一种广泛使用的工程材料，通常在高温下制备。已经发现了在超低温下合成纳米级WC的新机理。这一发现为以有价值的方式合成有价值的碳化钨和其他碳化物开辟了一条新途径。新颖的形成机理是基于离子交换树脂作为碳源，以局部固定W和Fe物种。作为中间体，FeWO4可以在较低的温度下形成，可以随树脂的碳化直接转化为WC。 WC的尺寸可以小于2微米。由负载在纳米级WC-GC（WC石墨化碳）上的Pt纳米颗粒制成的催化剂对氧还原反应显示出增强的电催化活性。结果还表明，沉积在WC-GC上的Pt纳米颗粒以Pt（111）平面为主，质量活性为257.7 mA mg -1 Pt@0.9V。
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