Electrochemical fixation of nitrogen to ammonia with highly active, highly selective and low cost electrocatalysts is a sustainable alternative to the extremely energy- and capital-intensive Haber-Bosch process. Herein, we demonstrate a near electroneutral WO₃ nanobelt catalyst to be a promising electrocatalyst for selective and efficient nitrogen reduction. The concept of near electroneutral interface is demonstrated by fabricating WO₃ nanobelts with small zeta potential value on carbon fiber paper, which ensures a loose double layer structure of the electrode/ electrolyte interface and allows nitrogen molecules access the active sites more easily and regulates proton transfer to increase the catalytic selectivity. The WO₃/CFP electrode with optimal surface charge achieves a NH₃ yield rate of 4.3 μg·h⁻¹·mg⁻¹ and a faradaic efficiency of 37.3% at −0.3 V vs. RHE, rivalling the performance of the state-of-the-art nitrogen reduction reaction electrocatalysts. The result reveals that an unobstructed gas-diffusion pathway for continually supplying enough nitrogen to the active catalytic sites is of great importance to the overall catalytic performance.