In situ grown Ni phosphide nanowire array on Ni foam as a high-performance catalyst for hydrazine electrooxidation
In situ grown Ni phosphide nanowire array on Ni foam as a high-performance catalyst for hydrazine electrooxidation
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DOI：
10.1016/j.apcatb.2018.09.043
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
He Wen;L. Gan;H. Dai;Xiao-Ping Wen;Linen Wu;Hui Wu;Ping Wang
中科院分区：
文献类型：
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作者：
He Wen;L. Gan;H. Dai;Xiao-Ping Wen;Linen Wu;Hui Wu;Ping Wang
合成高性能、高性价比的联氨电氧化催化剂是发展直接联氨燃料电池(DHFC)作为一种可行的能量转换技术的关键。本文报道了磷化镍(NixP)作为联氨电氧化催化剂的理论和实验相结合的研究。以次亚磷酸盐为磷源，采用一步磷化法制备了泡沫镍负载的NixP纳米线阵列。在应用条件下观察到Ni12P5和Ni2P相是商业氮肥直接磷化的产物，Ni2P纳米颗粒仅分布在Ni12P5表面。NixP/NF催化剂在碱性条件下对肼的完全电氧化表现出极高的活性、优异的耐久性和近100%的选择性，是已报道的肼电氧化催化剂中性能最好的催化剂之一。用第一性原理计算方法研究了磷化镍对联氨电氧化的催化机理。
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 (NixP) as promising catalysts for hydrazine electrooxidation. NixP nanowire array supported on a Ni foam (NF) was synthesized by a one-step phosphorization method using hypophosphite as a P-source. Ni12P5and Ni2P phases are observed as the products of the direct phosphorization of commercial NF under the applied conditions with Ni2P nanoparticles exclusively distributing on the surface of Ni12P5. The NixP/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.