Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Phys Chem Chem Phys. 2013 Jan 28;15(4):1088-92. doi: 10.1039/c2cp44215a.
Mesoporous titanium nitride (TiN) with high surface area and good electrical conductivity was prepared by a novel solid-solid phase separation method from a Zn containing titanium oxide, Zn(2)TiO(4). The PXRD shows single phase rocksalt structure of TiN with a domain size of 25 nm. The conductivity of mesoporous TiN at 35 bar is 395 S cm(-1). The Pt/TiN catalyst exhibits more negative onset potential for methanol electrooxidation (0.15 V) than Pt/C (0.22 V), showing a higher intrinsic electrocatalytic activity, while its peak current density (228 mA mg(-1) Pt) is ∼1.5 times higher than that of Pt/C (148 mA mg(-1) Pt). The Pt/TiN catalyst also demonstrates excellent long-term stability. This work provides an efficient method to prepare mesoporous nitrides as a promising support towards oxidation of small organic molecules in fuel cells.
介孔氮化钛（TiN）具有高比表面积和良好的导电性，由一种新型的固-固相分离方法从含锌的钛氧化物 Zn2TiO4 制备而成。X 射线粉末衍射（PXRD）显示 TiN 具有单相岩盐结构，其晶粒尺寸为 25nm。在 35 巴下，介孔 TiN 的电导率为 395 S cm-1。Pt/TiN 催化剂的甲醇氧化起始电位比 Pt/C（0.22V）更负（0.15V），表现出更高的本征电催化活性，而其峰值电流密度（228mA mg-1Pt）比 Pt/C（148mA mg-1Pt）高约 1.5 倍。Pt/TiN 催化剂还表现出优异的长期稳定性。这项工作提供了一种有效的方法来制备介孔氮化物，作为燃料电池中氧化小分子的一种很有前途的载体。
