Water splitting by electrolysis at high current densities under 1.6 volts†,Energy & Environmental Science

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Water splitting by electrolysis at high current densities under 1.6 volts†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-05-31 00:00:00 , DOI: 10.1039/c8ee00927a
Haiqing Zhou _{1,

2,

3,

4,

5} , Fang Yu _{1,

2,

3,

4,

5} , Qing Zhu _{1,

2,

3,

4} , Jingying Sun _{1,

2,

3,

4} , Fan Qin _{2,

3,

4,

6} , Luo Yu _{7,

8,

9,

10} , Jiming Bao _{2,

3,

4,

6} , Ying Yu _{7,

8,

9,

10} , Shuo Chen _{1,

2,

3,

4} , Zhifeng Ren _{1,

2,

3,

4}

Affiliation

Splitting water into hydrogen and oxygen by electrolysis using electricity from intermittent waste heat, wind, or solar energies is one of the easiest and cleanest methods for high-purity hydrogen production and an effective way to store the excess electrical power. The key dilemma for efficient large-scale production of hydrogen by splitting of water via the hydrogen and oxygen evolution reactions (HER and OER, respectively) is the high overpotential required, especially for the OER. We report an exceptionally active and durable OER catalyst yielding current densities of 500 and 1000 mA cm⁻² at overpotentials of only 259 mV and 289 mV in alkaline electrolyte, respectively, fulfilling the commercial criteria of the OER process. Together with a good HER catalyst, we have achieved the commercially required current densities of 500 and 1000 mA cm⁻² at 1.586 and 1.657 V, respectively, with very good stability, dramatically lower than any previously reported voltage. This discovery sets the stage for large-scale hydrogen production by water splitting using excess electrical power whenever and wherever available.

中文翻译：

在1.6伏以下的高电流密度下通过电解将水分解†

使用间歇性废热，风或太阳能通过电能将水分解成氢气和氧气是最简单，最清洁的高纯度氢气生产方法之一，也是存储多余电能的有效方法。通过氢气和氧气逸出反应（分别为HER和OER）将水分解而有效大规模生产氢气的关键难题是所需的高过电势，特别是对于OER。我们报道了一种异常活跃且持久的OER催化剂，其电流密度为500和1000 mA cm ^-2在碱性电解液中的超电势分别仅为259 mV和289 mV，符合OER工艺的商业标准。结合良好的HER催化剂，我们已经在1.586和1.657 V时分别实现了500和1000 mA cm ^-2的商业要求电流密度，具有非常好的稳定性，大大低于以前报道的任何电压。这一发现为在任何时候和任何地方使用过量电力进行水分解而为大规模制氢奠定了基础。

更新日期：2018-05-31

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