Designing high active, low cost and bifunctional electrocatalysts is urgent for developing clean energy storage and conversion systems. Transition metal selenides exhibit optimal electronic conductivity and tunable physicochemical properties, which endow them with potential for efficient electrocatalysts to facilitate the oxygen reduction and oxygen evolution reactions (ORR and OER). Herein, hollow Ni_xCo_0.85-xSe nanospheres were synthesized using a facile polyol based solution chemical method. The Ni_xCo_0.85-xSe exhibits an onset overpotential of 0.89 V for ORR, and an overpotential of 305 mV to achieve 10 mA cm⁻² for OER. Moreover, the Ni_xCo_0.85-xSe based Zn-air battery displays remarkable specific capacity and durability. Such superior catalytic performances can be attributed to the synergistic effect, large specific surface area and enhanced electron transfer rate. This approach provides a new way to design highly efficient bifunctional electrocatalysts for electrochemical energy storage and utilization.

设计高活性，低成本和双功能的电催化剂对于开发清洁能源存储和转换系统非常重要。过渡金属硒化物具有最佳的电子电导率和可调节的理化性质，这使它们具有有效的电催化剂潜力，可促进氧还原和氧释放反应（ORR和OER）。在此，中空的Ni _x Co _{0.85- x} Se纳米球是使用基于多元醇的溶液化学方法合成的。Ni _x Co _{0.85- x} Se对ORR表现出0.89 V的起始过电势，对OER表现出10 m cm ^-2的过电势为305 mV 。而且，Ni _x Co_{0.85- x} Se基的锌空气电池具有出色的比容量和耐用性。这种优异的催化性能可归因于协同效应，大的比表面积和增强的电子传输速率。该方法为设计用于电化学能量存储和利用的高效双功能电催化剂提供了新途径。