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Ultra-small intermetallic NiZn nanoparticles: a non-precious metal catalyst for efficient electrocatalysis
Nanoscale Advances ( IF 4.6 ) Pub Date : 2019-11-27 , DOI: 10.1039/c9na00611g Arnab Samanta 1 , Sankar Das 1 , Subhra Jana 1, 2
Nanoscale Advances ( IF 4.6 ) Pub Date : 2019-11-27 , DOI: 10.1039/c9na00611g Arnab Samanta 1 , Sankar Das 1 , Subhra Jana 1, 2
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Intermetallics are long-range-ordered alloys traditionally synthesized by annealing nanoparticles of a random alloy, which results in the sintering of the nanoparticles and leads to the formation of polydispersed samples. It thus remains a challenge to achieve a monodispersion of tiny intermetallics. In the current work, ultra-small monodisperse intermetallic NiZn nanoparticles were synthesized based on a low-temperature solution chemistry route involving the chemical conversion of metal nanoparticles into an ordered alloy using an organometallic zinc precursor. During the transformation of single metal nanoparticles into the corresponding alloy, the particles retained their morphology. The resulting ordered alloy made up of earth-abundant materials demonstrated high electrocatalytic performance for the oxygen evolution reaction (OER) with a low overpotential of 283 mV at a current density of 10 mA cm−2 and a small Tafel slope of 73 mV dec−1, along with excellent stability and durability. The prepared intermetallic NiZn exhibited outstanding OER efficacy, better than those of a Ni0.7Zn0.3 alloy, pure Ni nanoparticles and even state-of-the art RuO2. The atomic ordering as well as the modification of the electronic structure of Ni upon becoming alloyed with Zn, together with an atomic-scale synergistic effect produced from Ni and Zn, led to the enhanced intrinsic catalytic activity. The present findings point to a general route to produce nanoscale tiny alloys and also provide excellent electrocatalysts having exceptional energy conversion efficiency.
中文翻译：
超小金属间化合物 NiZn 纳米粒子：一种用于高效电催化的非贵金属催化剂
金属间化合物是长程有序合金，传统上通过对随机合金的纳米粒子进行退火来合成，这导致纳米粒子的烧结并导致多分散样品的形成。因此，实现微小金属间化合物的单分散仍然是一个挑战。在目前的工作中，基于低温溶液化学路线合成了超小的单分散金属间化合物 NiZn 纳米粒子，该路线涉及使用有机金属锌前体将金属纳米粒子化学转化为有序合金。在单个金属纳米颗粒转化为相应合金的过程中，颗粒保持其形态。-2和 73 mV dec -1的小 Tafel 斜率，以及出色的稳定性和耐用性。制备的金属间化合物NiZn表现出优异的OER功效，优于Ni 0.7 Zn 0.3合金、纯Ni纳米颗粒甚至最先进的RuO 2。与锌合金化后，镍的原子有序性和电子结构的改变，以及镍和锌产生的原子级协同效应，导致本征催化活性增强。目前的发现指出了生产纳米级微小合金的一般途径，并且还提供了具有出色能量转换效率的优秀电催化剂。
更新日期：2019-11-27
中文翻译：
超小金属间化合物 NiZn 纳米粒子：一种用于高效电催化的非贵金属催化剂
金属间化合物是长程有序合金，传统上通过对随机合金的纳米粒子进行退火来合成，这导致纳米粒子的烧结并导致多分散样品的形成。因此，实现微小金属间化合物的单分散仍然是一个挑战。在目前的工作中，基于低温溶液化学路线合成了超小的单分散金属间化合物 NiZn 纳米粒子，该路线涉及使用有机金属锌前体将金属纳米粒子化学转化为有序合金。在单个金属纳米颗粒转化为相应合金的过程中，颗粒保持其形态。-2和 73 mV dec -1的小 Tafel 斜率，以及出色的稳定性和耐用性。制备的金属间化合物NiZn表现出优异的OER功效，优于Ni 0.7 Zn 0.3合金、纯Ni纳米颗粒甚至最先进的RuO 2。与锌合金化后，镍的原子有序性和电子结构的改变，以及镍和锌产生的原子级协同效应，导致本征催化活性增强。目前的发现指出了生产纳米级微小合金的一般途径，并且还提供了具有出色能量转换效率的优秀电催化剂。
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