Wang Weiyi, Liu Danni, Hao Shuai, Qu Fengli, Ma Yongjun, Du Gu, Asiri Abdullah M, Yao Yadong, Sun Xuping
College of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, Shandong, China.
Analytical and Test Center, Southwest University of Science and Technology , Mianyang 621010, China.
Inorg Chem. 2017 Mar 20;56(6):3131-3135. doi: 10.1021/acs.inorgchem.6b03171. Epub 2017 Mar 6.
It is highly desired but still remains a key challenge to develop iron-based large-surface-area arrays as heterogeneous water oxidation catalysts that perform efficiently and durably under mild pH conditions for solar-to-hydrogen conversion. In this work, we report the in situ derivation of an iron phosphate-borate nanosheet array on carbon cloth (Fe-Pi-Bi/CC) from an iron phosphide nanosheet array via oxidative polarization in a potassium borate (KBi) solution. As a 3D catalyst electrode for water oxidation at mild pH, such a Fe-Pi-Bi/CC shows high activity and strong long-term electrochemical durability, and it only demands an overpotential of 434 mV to drive a geometrical catalytic current density of 10 mA cm with maintenance of its activity for at least 20 h in 0.1 M KBi. This study offers an attractive earth-abundant catalyst material in water-splitting devices toward the large-scale production of hydrogen fuels under benign conditions for application.
开发铁基大表面积阵列作为异相水氧化催化剂，使其在温和的pH条件下高效、持久地进行太阳能到氢能的转化，这是人们非常期待的，但仍然是一个关键挑战。在这项工作中，我们报告了通过在硼酸钾（KBi）溶液中进行氧化极化，从磷化铁纳米片阵列原位衍生出碳布上的磷酸铁-硼酸盐纳米片阵列（Fe-Pi-Bi/CC）。作为用于在温和pH下进行水氧化的三维催化剂电极，这种Fe-Pi-Bi/CC表现出高活性和强大的长期电化学耐久性，在0.1 M KBi中驱动10 mA cm的几何催化电流密度仅需434 mV的过电位，且其活性至少可维持20小时。这项研究为水分解装置提供了一种有吸引力的、储量丰富的催化剂材料，有助于在良性条件下大规模生产氢燃料以供应用。
