Hydrogen production performance of a membrane-less bio-electrochemically assisted microbial reactor was studied in this paper. Membrane-less microbial reactor consisted of carbon felt as anode, carbon plate supported by self-made Ni-Al-Sn alloy powders (Ni-50% ,Al-45% ,Sn-5% ) as cathode and acetate as electrolyte for generating hydrogen. Its principle was that the organic was degraded by microbe to produce electron and protons in the anode chamber, and then protons arriving at cathode got electron and generated hydrogen through an applied voltage between two electrodes of membrane-less microbial reactor. The influences of carbon felt amount used for the anode, environment temperature, and applied voltage, etc. on hydrogen production rate and hydrogen selectivity were studied. And the optimal results demonstrated that the rate of hydrogen production reached at 4.21 m3/(d·m3) and the highest hydrogen selectivity was 70.4% when the anode surface area was 900 cm2, the environment temperature was 30 ℃ and the applied voltage was 0. 9 V.%研究了无膜生物电化学制氢反应器的设计及产气特性。设计和组装的电化学制氢反应器为无膜电化学制氢反应器。它是以碳毡作为阳极，以负载一定量Ni-A1-Sn(Ni-50％、Al-45％、Sn-5％)合金粉催化剂的石墨板作为阴极，乙酸钠作为电解质。其工作原理是在两极间外加一定电压，阳极区的微生物降解有机物产生电子到达阴极，质子在阴极得到电子生成氢气。主要考察了阳极碳毡数量、环境温度、外加电压等因素对产气速率和氢气选择性的影响。结果表明，当阳极面积为900 cm2、环境温度为30℃、外加电压为0.9 V时，反应器产气速率最高可达4.21 m3/(d·m3)，氢气选择性最高为70.4％。
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