Low-temperature fuel cells are the most promising sustainable energy technology as they use hydrogen, an environmentally clean fuel. However, the sluggish kinetics of oxygen electrochemistry, a chronic issue, is holding them from commercialization. Herein, we address this issue through a molecular level design of a Graphene oxide anchored Metal Organic Molecular Assembly (G-MOMA) based catalyst. This non-precious metal catalyst consists of Ni and Fe ions ligated by graphene oxide supported terpyridine, a unique molecular assembly design that maximizes the utilization of active metal centers. This G-MOMA catalyst brings down an over potential (240 mV) for oxygen evolution reaction (OER) as close as that of the bench mark catalyst Ru/C with an impressive Tafel slope of 58 mV/dec and a cyclic stability of >30,000 cycles. G-MOMA excels in oxygen reduction reaction (ORR) too with an onset at 0.88 V (vs RHE). The remarkably stable G-MOMA catalyst surprises with an excellent bi-functionality towards both OER and ORR with an overall potential difference of mere 0.77 V, which is 180 mV and 70 mV lesser than the standard Pt/C and Ru/C catalysts, respectively. The G-MOMA catalyst is well in the activity range of the state-of-art bi-functional catalysts and yet cheaper by many folds.

低温燃料电池是最有前途的可持续能源技术，因为它们使用氢，一种环境清洁的燃料。然而，氧电化学缓慢的动力学是一个长期存在的问题，阻碍了它们的商业化。在此，我们通过氧化石墨烯锚定金属有机分子组装 (G-MOMA) 催化剂的分子水平设计来解决这个问题。这种非贵金属催化剂由氧化石墨烯负载的三联吡啶连接的 Ni 和 Fe 离子组成，这是一种独特的分子组装设计，可最大限度地利用活性金属中心。这种 G-MOMA 催化剂降低了析氧反应 (OER) 的过电位 (240 mV)，与基准催化剂 Ru/C 接近，具有令人印象深刻的 58 mV/dec 塔菲尔斜率和 >30,000 的循环稳定性循环。G-MOMA 在氧还原反应 (ORR) 方面也表现出色，起始电压为 0.88 V（相对于 RHE）。非常稳定的 G-MOMA 催化剂对 OER 和 ORR 具有出色的双功能性，总电位差仅为 0.77 V，分别比标准 Pt/C 和 Ru/C 催化剂小 180 mV 和 70 mV . G-MOMA 催化剂在最先进的双功能催化剂的活性范围内很好，而且价格便宜许多倍。