Heteroatom and monometal decorated carbons (e.g., Fe-N/C or Co-N/C) are reported as effective oxygen reduction catalysts. However, they are seldom investigated for overall water splitting. Additionally, it is a significant challenge to increase the heteroatom content in carbon and achieve performance comparable or superior to precious metal-based catalysts. Here, NiFe-decorated, nitrogen, phosphorus, sulfur tri-doped nanocarbon with oxygen-containing groups, i.e., NiFe-N, P, S/C is reported as a highly-active electrocatalyst for overall water splitting. The carbons are prepared by one-step template-free pyrolysis. Alfalfa, one of the natural biomass with highest N: C ratio and significant P and S, works as the sole carbon and heteroatom source. During preparation, crucial factors including total amount of added transition metals, Ni to Fe molar ratio, and pyrolysis temperature, are optimized. Ni_0.75Fe_0.25-N, P, S/C prepared at 900 °C exhibits the best oxygen evolution reaction, hydrogen evolution reaction, and overall water splitting activity and stability. This material even exceeds the benchmark RuO₂ in catalysing oxygen evolution reaction. Its overall water splitting activity is comparable to Pt/C-RuO₂, making it one of the best water splitting electrocatalysts. This exciting performance is attributed to the high heteroatom level ((N+P+S+O): C = 27.6 at.%), as well as the bimetal decoration.

据报道，杂原子和单金属修饰的碳（例如Fe-N / C或Co-N / C）是有效的氧还原催化剂。但是，很少对它们进行整体水分解的研究。另外，增加碳中的杂原子含量并达到与贵金属基催化剂相当或更高的性能是一个重大挑战。在此，据报道，具有含氧基团的NiFe修饰的氮，磷，硫三掺杂的纳米碳即NiFe-N，P，S / C是用于整个水分解的高活性电催化剂。碳是通过无一步模板热解制备的。紫花苜蓿是氮，碳比最高，磷和硫含量最高的天然生物质之一，是唯一的碳源和杂原子源。在准备过程中，关键因素包括添加的过渡金属总量，优化了Ni与Fe的摩尔比和热解温度。你在900°C下制备的_0.75 Fe _0.25 -N，P，S / C具有最佳的析氧反应，析氢反应以及总的水分解活性和稳定性。该材料在催化氧气逸出反应中甚至超过了基准RuO ₂。其总的水分解活性与Pt / C-RuO ₂相当，使其成为最佳的水分解电催化剂之一。这种令人兴奋的性能归因于高杂原子水平（（N + P + S + O）：C = 27.6 at。％），以及双金属装饰。