A triple junction (3J) solar cell having 33% efficiency at one Sun condition is integrated with an electrolyzer containing Pt wire electrodes to study the effect of pH, temperature and low flux solar light on H₂ production from water. Results indicate that electrolyte conduction affects the rate of reaction mostly due to the large voltage at maximum power (V_mpp) of the PV-cell. Measurements are performed both indoors, under 100–500 mWcm⁻² insolation, and outdoors. Electrochemical impedance measurements indicate that the exchange current, j_i, depends largely on the electrolyte resistance, r (j_i = (V_app-V_eq)/r); where V_app is applied voltage provided from the cell and V_eq is the equilibrium potential for water electrolysis (1.23 V). The small increase in the hydrogen production rate with temperature (E_a = 4.4 kJ mol⁻¹) is largely because of the high V_app, where above 1.6 V the IV curve enters into the Tafel slope region. The maximum solar-to-hydrogen conversion efficiency (STH) outdoor is found to be about 16% under acidic conditions. The high V_mpp (2.5 V) of the PV cell compared to V_opp (1.7 V) makes the current at maximum power (I_mpp) the limiting factor.

在一个太阳条件下效率为33％的三结（3J）太阳能电池与包含Pt线电极的电解槽集成在一起，以研究pH，温度和低通量太阳光对水中H ₂产生的影响。结果表明，电解质的传导会影响反应速率，这主要是由于PV电池在最大功率（V _mpp）时电压较高。在室内（日照在100–500 mWcm ^-2以下）和室外进行测量。电化学阻抗测量结果表明，交换电流j _i在很大程度上取决于电解质电阻r（j _i =（V _app -V _eq）/ r）。V _app是从电池提供的电压，V _eq是水电解的平衡电位（1.23 V）。制氢率随温度的微小增加（E _a  = 4.4 kJ mol ^-1）主要是由于较高的V _app，在高于1.6 V时IV曲线进入Tafel斜率区域。在酸性条件下，室外的最大太阳到氢转化效率（STH）被发现约为16％。与V _opp（1.7 V）相比，PV电池的高V _mpp（2.5 V）使最大功率（I _mpp）的电流成为限制因素。