The development of high activity and low-cost electrocatalysts through simple one-step method is of vital importance for electrocatalytic water splitting, but still remains a challenge. In this work, ternary Ni-N-P microparticles, an analogue of NiC_x, are in-situ grown on nickel foam through one-step phosphorization at low temperature under atmosphere of ammonia. The unique microparticles-like morphology and suitable electronic structure render them enhanced electron and mass transfer ability, ensuring superior activity and good durability in catalyzing oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) under alkaline condition. Specifically, the optimal Ni-N-P microparticles can deliver 10 mA/cm² at the overpotential of 260 mV and 180 mV vs. reversible hydrogen electrode (RHE) for OER and HER, respectively. Additionally, only a cell voltage of 1.7 V is required to afford 10 mA/cm² when the prepared Ni-N-P microparticles serve as both anode and cathode in two-electrode configuration for overall water splitting. The Ni-N-P microparticles hold promise as cost-effective and efficient candidate for practical water splitting devices.

通过简单的一步法开发高活性和低成本的电催化剂对于电催化水分解至关重要，但仍然是一个挑战。在这项工作中，三元镍NP微粒，NIC的类似物_X，是在原位通过一步法磷化在低温下的氨的气氛下生长在镍泡沫。独特的微粒状形态和合适的电子结构使其具有增强的电子和质量传递能力，从而确保了在碱性条件下催化氧释放反应（OER）和氢释放反应（HER）的优异活性和良好的耐久性。具体而言，最佳的Ni-NP微粒可以在260 mV和180 mV的过电势下提供10 mA / cm ²对用于分别OER和HER，可逆氢电极（RHE）。另外，当制备的Ni-NP微粒在两电极构造中同时用作阳极和阴极以用于整体水分解时，仅需要1.7V的电池电压即可提供10mA / cm ²。Ni-NP微粒有望成为实用的水分解装置的经济高效的候选产品。