Dong Jing, Sun Tingting, Zhang Yixin, Zhang Hong, Lu Songrang, Hu Dongmei, Chen Jianfeng, Xu Lianbin
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
J Colloid Interface Sci. 2021 Oct;599:603-610. doi: 10.1016/j.jcis.2021.04.124. Epub 2021 Apr 28.
Water electrolysis is a clean and efficient route for producing high-purity hydrogen. Developing highly efficient, stable and inexpensive electrocatalysts to replace Pt is currently a major challenge for the widespread application of water splitting. Herein, we report a facile and novel strategy for the synthesis of mesoporous NiCo alloy nanoparticle/reduced graphene oxide (MNiCo/rGO) composites via electroless deposition technique. Owing to the synergistic interaction of Ni and Co, the mesoporous structure of NiCo alloy, and the optimized combination of the mesoporous NiCo with rGO, the obtained optimal MNiCo/rGO catalyst exhibits outstanding electrocatalytic performance for hydrogen evolution reaction (HER) with a low overpotential of 115 mV to reach the current density of 10 mA cm, and a small Tafel slope of 45 mV dec, as well as a high durability in alkaline solution. These remarkable merits make it a favorable alternative to noble metal Pt-based catalysts for HER, thereby further promoting the development of non-noble metal electrocatalysts.
水电解是生产高纯度氢气的一种清洁高效途径。开发高效、稳定且廉价的电催化剂以替代铂，是当前水分解广泛应用面临的一项重大挑战。在此，我们报道了一种通过化学沉积技术合成介孔镍钴合金纳米颗粒/还原氧化石墨烯（MNiCo/rGO）复合材料的简便新颖策略。由于镍和钴的协同相互作用、镍钴合金的介孔结构以及介孔镍钴与rGO的优化组合，所制备的最优MNiCo/rGO催化剂在析氢反应（HER）中表现出出色的电催化性能，过电位低至115 mV时可达到10 mA cm的电流密度，塔菲尔斜率为45 mV dec，并且在碱性溶液中具有高耐久性。这些显著优点使其成为用于HER的贵金属铂基催化剂的有利替代品，从而进一步推动了非贵金属电催化剂的发展。
