Although great advances have been achieved in the field of electrocatalysis, the design of highly efficient and stable earth-abundant electrocatalysts for overall water splitting remains a significant challenge. Herein, we have successfully developed cost-efficient three dimensional (3D) highly open hierarchical catalysts with cobalt-molybdenum nanosheet arrays on nickel foam (NF) (denoted as CoMoO [email protected]) and CoMoP [email protected] via phosphorization for efficient overall water splitting. The optimized Co₅Mo_1.0O [email protected] exhibits excellent OER activity with low overpotentials of 270 mV at 10 mA cm⁻² and superior stability after 140 h and the optimized Co₅Mo_1.0P [email protected] shows excellent HER activity with low overpotential of 173 mV at 10 mA cm⁻² and superior stability after 1000 CV cycles. In addition to the enhanced electron migration and mass transfer benefited from the 3D structure, the XPS analysis shows that Mo plays a vital role on modulating the number of active sites on the surface, leading to the electrocatalytic enhancement. Significantly, the Co₅Mo_1.0O [email protected]//Co₅Mo_1.0P [email protected] couple showed highly efficient overall water electrolysis with a low potential of 1.68 V at 10 mA cm⁻² in an alkaline electrolyzer as well as excellent stability after long-term water splitting, holding great potential for practical overall water splitting electrocatalysis.

尽管在电催化领域已经取得了很大的进步，但是用于整体水分解的高效和稳定的富含地球的电催化剂的设计仍然是一个巨大的挑战。在这里，我们已经成功开发出了具有成本效益的三维（3D）高开放性分层催化剂，该催化剂具有在镍泡沫（NF）上表示为钴钼纳米片的阵列（表示为CoMoO [受电子邮件保护]）和CoMoP [受电子邮件保护]通过磷化处理，从而实现了有效的整体水分解。优化的共₅沫_1.0与270毫伏的低的超电势-O [电子邮件保护]显示出优异的活性OER在10mA厘米^-2和后优良的稳定性140小时，并优化共₅沫_1.0P [电子邮件保护]显示出色的HER活性，在10 mA cm ^-2时的低过电势为173 mV，在1000 CV循环后具有出色的稳定性。除了得益于3D结构带来的增强的电子迁移和质量转移，XPS分析还表明，钼在调节表面活性位点的数量方面起着至关重要的作用，从而导致电催化作用的增强。值得注意的是，Co ₅ Mo _1.0 O [受电子邮件保护] // Co ₅ Mo _1.0 P [受电子邮件保护]对显示出高效的整体水电解性能，在10 mA cm ^-2时的电势低至1.68 V 在碱性电解槽中具有良好的稳定性，并且在长期水分解后具有出色的稳定性，在实际的整体水分解电催化方面具有很大的潜力。