Wen He, Gan Li-Yong, Dai Hong-Bin, Wen Xiao-Ping, Wu Lin-Song, Wu Hui, Wang Ping
School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, PR China.
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899-6102, United States.
Appl Catal B. 2019 Feb;241. doi: 10.1016/j.apcatb.2018.09.043.
Synthesis of high-performance and cost-effective electrocatalysts towards hydrazine electrooxidation is vital to develop the direct hydrazine fuel cell (DHFC) as a viable energy conversion technology. Herein, we report a combined experimental and theoretical study of nickel phosphides (NiP) as promising catalysts for hydrazine electrooxidation. NiP nanowire array supported on a Ni foam (NF) was synthesized by a one-step phosphorization method using hypophosphite as a P-source. NiP and NiP phases are observed as the products of the direct phosphorization of commercial NF under the applied conditions with NiP nanoparticles exclusively distributing on the surface of NiP. The NiP/NF catalyst exhibits a synergetic capabilities of exceptionally high activity, excellent durability and nearly 100% selectivity towards the complete electrooxidation of hydrazine in alkaline condition, which is among the best performance reported on hydrazine electrooxidation catalysts. First-principles calculations have been conducted to gain insight into the catalytic mechanism of Ni phosphides towards hydrazine electrooxidation.
合成高性能且经济高效的肼电氧化电催化剂对于将直接肼燃料电池（DHFC）发展成为一种可行的能量转换技术至关重要。在此，我们报告了对磷化镍（NiP）作为肼电氧化有前景的催化剂的实验和理论相结合的研究。使用次磷酸盐作为磷源，通过一步磷化法合成了负载在泡沫镍（NF）上的NiP纳米线阵列。在施加的条件下，观察到NiP和NiP相是商业NF直接磷化的产物，NiP纳米颗粒仅分布在NiP表面。NiP/NF催化剂在碱性条件下对肼的完全电氧化表现出协同能力，具有极高的活性、出色的耐久性和近100%的选择性，这是报道的肼电氧化催化剂中最好的性能之一。已进行第一性原理计算以深入了解磷化镍对肼电氧化的催化机理。
