Development of highly efficient non‐noble metal electrocatalysts to replace platinum for hydrogen evolution reaction (HER) has attracted tremendous attention in recent years. In this work, a kind of novel Mo_xW_2−xC@C hollow spheres with tunable stoichiometry is successfully synthesized. The synergetic effect of appropriate W‐introducing and hollow structure enables the composites to have superior performance for electrocatalytic HER and long‐term stability in a wide pH range. The Mo_xW_2−xC@C with an optimized Mo/W ratio of 1.26/0.74 exhibits an overpotential (η₁₀) of 106, 127, and 152 mV at 10 mA cm⁻² in 1 m KOH, 0.5 m H₂SO₄, and 1 m phosphate buffer saline (PBS), respectively, and its overpotential in high current density region (η₃₀₀) is only 237 and 250 mV in alkaline and acidic electrolytes, which are significantly better than most of the previously reported electrocatalysts.

中文翻译：

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pH通用的钼-钨双金属碳化物空心球的合成，用于有效的氢气析出反应

近年来，开发高效的非贵金属电催化剂代替铂进行放氢反应（HER）引起了极大的关注。在这项工作中，成功地合成了一种具有可调化学计量比的新颖的Mo _x W _{2− x} C @ C空心球。适当的W引入和中空结构的协同作用使复合材料在宽pH范围内具有优异的电催化HER性能和长期稳定性。Mo的_X w ^ _{2- X} Ç@下用优化的钼/ W为1.26 / 0.74的展品的超电势（η比₁₀的106，127，和152）毫伏在10mA厘米^-2 1米KOH，0.5米ħ ₂ SO ₄和1米的磷酸盐缓冲盐水（PBS），分别和其在高电流密度区域的超电势（η ₃₀₀）是唯一的237和250毫伏在碱性和酸性电解质，其是显著优于大多数先前报告的电催化剂。