Rh2S3/N‐Doped Carbon Hybrids as pH‐Universal Bifunctional Electrocatalysts for Energy‐Saving Hydrogen Evolution

• DOI: 10.1002/smtd.202000208
• Publication Date: 2020-05-25T07:34:43Z
• Authors: Chaoxiong Zhang; Haoxuan Liu; Yifan Liu; Xijun Liu; Yuying Mi; Ruijie Guo; Jiaqiang Sun; Haihong Bao; Jia He; Yuan Qiu; Junqiang Ren; Xiangjun Yang; Jun Luo; Guangzhi Hu
• Keywords: Overpotential; Oxygen evolution; Hydrazine (antidepressant)

Abstract Using hydrazine oxidation reaction (HzOR) to replace the oxygen evolution is an effective way decrease overpotential of anodic in overall water splitting (OWS), facilitating cost‐effective and safe hydrogen production. Herein, Rh 2 S 3 /N‐doped carbon hybrids (Rh /NC) are first reported as novel efficient bifunctional electrocatalysts for hydrazine‐assisted generation over a wide pH range. Specifically, /NC exhibits low overpotentials (HER) alkaline (38 mV), neutral (46 acidic (21 mV) electrolytes, reach current density 10 mA cm −2 , maintains activities 70 h. Meanwhile, also displays competitive HzOR performance at all‐pH electrolytes. Thus, serving electrocatalyst both HER HzOR, shows overwhelming‐Pt/C three can save 93.3%, 85.2%, 78.3% energy consumption compared corresponding OWS system. Moreover, theoretical calculations confirm that owns free‐energy changes H adsorption dehydrogenation adsorbed NHNH which beneficial enhance catalytic activity. This work develops with free pH‐dependent condition electrolysis system furtherly reduce cost massive industrial